# Lucrari

Titlu:
THE MOVEMENT OF AN ELECTRON AROUND THE ATOMIC NUCLEUS

Rezumat:
Movement of an electron around the atomic nucleus has today a great importance in many engineering fields. Electronics, aeronautics, micro and nano technology, electrical engineering, optics, lasers, nuclear power, comput-ing, equipment and automation, telecommunications, genetic engineering, bio-engineering, special processing, modern welding, robotics, energy and electro-magnetic wave field is today only a few of the many applications of electronic engineering. This paper presents shortly a new and original relation which calculates the radius with that the electron is running around the atomic nucleus

CuvinteCheie:
Electron, nucleus, nucleons, proton, neutron, atom, quantum


Rezumat:
Otto engine dynamics are similar in almost all common internal combustion engines. We can speak so about dynamics of engines: Lenoir, Otto, and Diesel. The dynamic presented model is simple and original. The first thing necessary in the calculation of Otto engine dynamics, is to determine the inertial mass reduced at the piston. One uses then the Lagrange equation


Titlu:
AN ANALYTICAL ELASTIC-PLASTIC STRESS ANALYSIS IN A WOVEN STEEL REINFORCED THERMOPLASTIC CANTILEVER BEAM LOADED UNIFORMLY

Rezumat:
In this investigation, an elastic–plastic stress analysis is carried out in a woven steel fiber reinforced thermoplastic (LDPE, F.2.12) composite cantilever beam loaded uniformly at the upper surface. Closed form solution is found satisfying both the governing differential equation and boundary conditions. The beam is loaded by a small uniform force at the upper surface, therefore during the solution of the problem for the elastic–plastic case; the normal stress σy is neglected in comparison with other stress components. The orientation angles of the fibers are chosen as 0o, 15o, 30o and 45°. The intensity of the residual stress component of σx is maximum at the upper and/or lower surfaces of the beam. The intensity of the residual stress component of the shear stress τxy is maximum on or around the x axis.

CuvinteCheie:
Elastic–plastic stress analysis; Residual/internal stress, thermoplastic composite, cantilever beam


Titlu:
ON STATIC BEHAVIOR OF DENTAL IMPLANTS UNDER DIFFERENT LOAD DIRECTIONS

Rezumat:
One of the most important factors that determine implant success is the achievement and maintenance of implant stability. This numerical study was carried out using three – dimensional finite element method (FEM) and aimed to investigate static behaviors of dental implant under different load directions. Solid models of implants were built up in Solid Works and then transferred to a mesh model in FEM (ANSYS) to perform a stress analysis. The distribution of the equivalent stresses and total deformations in the dental implant components (abutment, implant and bone) is presented

CuvinteCheie:
dental implant, static behavior, finite element method


Titlu:
ELASTIC, PLASTIC AND RESIDUAL STRESS ANALYSIS IN SYMMETRIC THERMOPLASTIC LAMINATED PLATES UNDER VARIOUS TEMPERATURE CHANGE THROUGH THE THICKNESS: ANALYTICAL SOLUTION

Rezumat:
In this study, thermal elastic, plastic and residual stress analysis are carried out on simply supported symmetric cross-ply [0°/90°]2 and angle-ply [15°/-15°]2, [30°/-30°]2, [45°/-45°]2, [60°/-60°]2 thermoplastic laminated plates under various temperature change through the thickness of plates. In the solution, mechanical properties and yield strengths of the composite layer have been inserted in the program which has been designed within FORTRAN software. Elastic, plastic and residual stresses which are determined in the symmetric cross-ply and angle-ply laminated plates for small deformations are prepared as a table. Residual stresses on the X and Y axes have been plotted for each of the orientation angles which are mentioned above. The composite materials are as-sumed to be strain hardening. The Tsai-Hill Theory is used as a yield criterion. The intensity of stress components in the symmetric cross-ply laminated plate is higher than in angle-ply laminated plate due to the differences among the stiff-ness of layers. Plastic yielding occurs in all the laminated plate at the same temperature

CuvinteCheie:
composite materials, thermoplastic composite, laminated plates, residual stress analysis, the Tsai-Hill theory, elastic-plastic analysi


Titlu:
DETERMINATION OF PROCESSING FORCES ON CENTERLESS GRINDING MACHINES WHIT TRANSVERSAL ADVANCE IN FAVOR OF ACTIVE CONTROL AND ADAPTIVE CONTROL

Rezumat:
In this paper it is presented a theoretical and experimental method for determin-ing of the technological process parameters for the centerless grinding whit transversal advance based on calculating the forces from the working zone

CuvinteCheie:
parameters, centerless grinding, forces, stress analysis, oscillograms


Titlu:
THE EFFECTS OF THE MODULATION POWER ON THE ENERGETIC SAVING UTILISING A CONDENSING BOILER

Rezumat:
In this paper, we present a theoretical study based on the energetic saving analysis obtained by working in partial loads across the modulation effect of the condensing boiler comparative to traditional boiler. The climate dates utilized for this study are obtained from the geophysical station of the country

CuvinteCheie:
modulation burn, reduction of energy, thermal optimization, boiler, condensation


Titlu:
POSITION ANALYSIS IN POLYNOMIAL FORM OF CLASS-THREE RP-RP-RP ASSUR GROUP

Rezumat:
This paper presents the position analysis in polynomial form of the class-three RP-RP-RP Assur group including three prismatic joints. The aim of this position analysis is to determine all possible configurations of the Assur group, for a given position of its external joints. The position analysis leads to a non-linear system of three equations with three unknown parameters. Using a successive elimination procedure, a polynomial equation of eighth order in one unknown is obtained. The real solutions of the polynomial equation correspond to assembly modes of the Assur group. The maximum number of the assembly modes of the triad is two. Furthermore, the proposed method is used for the forward displacement analysis of a 3-RRP and 3-PRP planar parallel manipulators which include a RP-RP-RP Assur group. A numerical application of the proposed method is presented

CuvinteCheie:
Assur group, position analysis, planar mechanism


Titlu:
STRUCTURAL ANALYSIS OF HIGH VOLTAGE ELECTRIC EQUIPMENT WITH A VIEW TO THE SEISMIC CAPABILITY ASSESSMENT

Rezumat:
The paper presents the theoretical background of a methodology for seismic capability assessment of the high voltage equipments using experimental modal analysis methods. The methodology was applied on some representative types of circuit breakers and disconnecting switchers situated in the working place. The same methodology was applied on a circuit breaker type IO220 kV/2500A, situated on seismic platform from SC EUROTEST SA Bucharest, after finishing the tests with vibratory signals applied to the base. The equipment, in the same mounting conditions, was tested by means of the present methodology. They were determined the frequency response functions, modal parameters, and theoretical response of some representative points to theoretical vibratory motions applied to base, the same as applied during the direct experimental tests. At the end of paper it is effectuated a comparative analyses of the results obtained through the two methods: direct tests on seismic platform and combined analysis by EMA


Titlu:
THE ROLE OF MECHATRONICS IN THE EDUCATION OF AUTOMOTIVE ENGINEER

Rezumat:
The increasing complexity of vehicles create a continuos need for multi disciplinary qualified engineer. This paper describes the type of mechatronic systems found on vehicles, and the problems faced by the engineers for the developments of this systems. The paper describes some aspects of the development process and discusses the skills required by engineers as well as the interdependence of these skills with those of mechatronics engineers. The paper concludes that mechatonic engineers are necessary in the process of education and are prepared for the mechatronic systems of automotive industry

CuvinteCheie:
Systems Engineering, Mechatronics, Education, Automotive


Rezumat:
In this paper a rigid sphere is obliquely impacting a granular media. The influence of initial impact velocity and impact angle are examined. We are using a horizontal and a vertical resistance force of the media upon the rigid body. The penetrating distance is increasing with initial impact velocity as expected. However, the stopping time for most of the cases is decreasing with the initial impact velocity


Titlu:
DYNAMICS AND CONTROL OF A FLEXIBLE BEAM WITH IMPACTS

Rezumat:
The linear control of a parametrically excited impacting flexible link in rotational motion is considered. The equation of motion for such a system contains time periodic coefficients. To suppress the vibrations resulting after the impact with an external rigid body, a linear controller is designed via Lyapunov-Floquet transformation. In this approach the time periodic equations of motion are transformed into a time invariant form, which are suitable for the application of standard time invariant controller design techniques. The momentum balance method and an empirical coefficient of restitution is used to model the collision between the two bodies


Rezumat:
All surfaces are rough to some extent and therefore only a small portion actually contact when they are brought together.  Therefore heat flow from one object to another is obstructed by this incomplete contact, resulting in thermal contact resistance.  This work presents a new method for modeling TCR while considering the multi-scale nature of surfaces in the contact mechanics and heat transfer theory.  Based on Archard’s “protuberance upon protuberance” theory, this method employs sinusoids stacked into layers to represent the rough surface

CuvinteCheie:
contact resistance, thermal resistance, roughness, surface contact


Titlu:
MECHANISM OF SIX-SPEED AUTOMATIC TRANSMISSION

Rezumat:
A new family of automatic transmissions with six-speeds has developed in USA for compact and midsize vehicles. These six-speed automatic transmissions are also used for European market, as they are into the new Opel Astra since 2009. This transmission can be integrated in all vehicle platforms, because has the compact shape, high quality and good value-for-money level. As compared to the four – and five-speed transmissions which it replaces, the new six-speed transmission excels by its improved fuel economy as well as its improved performance

CuvinteCheie:
automatic transmission, six-speeds gear box, cylindrical gears


Titlu:
THE INFLUENCE OF RADIATORS WIDTH OVER THERMAL AND FLUID-DYNAMICS PERFORMANCES

Rezumat:
The work developed in this paper analyzes the way in which the width of the water – air heat exchangers (radiators) influences thermal and fluid-dynamic performances. The paper is based on experimental research on a very large number of radiators belonging to the same family. As a result of the experimental research diagrams of global heat transfer coefficient are presented as a function of air circulating speed through the device and the friction coefficient variation as a function of Re number; conclusions are drawn and recommendations on design and development have been made.

CuvinteCheie:
radiator thickness, thermal radiators, friction coefficient


Titlu:
FINITE ELEMENT MODEL UPDATING OF AN ENGINE IN THE AUTOMOTIVE INDUSTRY

Rezumat:
Nowadays, due to the market concurrence in the automotive field and the high customers standards, the acoustic comfort have become the one of the most important engineering require.
This paper deals with the NVH correlation test-calculation and the finite element (FE) model updating of an engine for automotive. The main objective for this approach is to obtain a more predictive FE model (modal frequencies, modal shapes), in order to improve the vibration behavior for this engine. Experimental and theoretical analysis used for this work, have allowed us to understand the real vibratory behavior and to obtain a new FE model more closed by reality. The final updating results are pre-sented and compared within paper

CuvinteCheie:
finite element, automotive engine, NVH, modal analysis, correlation, updating


Titlu:
STRESSES FIELD DISTRIBUTION FOR THE R520 STEEL TO AN OSCILLATOR POSITIVE FATIGUE SOLICITATION

Rezumat:
During the exploitation, into a piece could appear a crack because the stresses concentration into a point or certain area from material. Depending on the exterior loads, the crack could propagate and the crack surfaces will translate relatively one versus the other, determining three modes of crack growth. The most common mode in practice it is the mode I, growth trough opening, the propagation vector being perpendicularly orientated on the crack front and con-tained in his plane. At the tip of the crack the stresses varies during the work and depend by the solicitation state, piece or sample geometry, piece material. The paper propose an analysis of the stresses field variation from the tip of a crack for samples model CT, made by general use steel R520. These were tested to axial eccentric fatigue, to the room temperature, with the asymmetry coeffi-cients: R=0.1, R=0.3 and R=0.5. We have determined the stresses from the tip of the crack σx, σy and σc and we have graphical represented those variation versus the crack length variation a, durability N and stress intensity factor ΔK

CuvinteCheie:
crack, stress, fatigue, stress intensity factor


Titlu:
CONSIDERATION ABOUT THE SIMULATION OF THE OSTEOSYNTHESIS FOR THE HUMAN ELBOW BONES USING METALLIC IMPLANTS

Rezumat:
The paper presents a method of study and the steps to obtain the virtual system of the human elbow. For that purpose was used a CAD parametric software which permits to define models with a high level of difficulty. Also, were defined the implant models used for bone osteosynthesis (orthopaedic plates and screws). These parts were included in the virtual elbow joint. After that operation, the entire model of the human joint were analized using finite elements method

CuvinteCheie:
human elbow, cubitus, humerus, radius, FEA simulation


Titlu:
METHOD OF ANALYSIS FOR INDUSTRIAL BUILDINGS STRUCTURES MADE OF METAL

Rezumat:
The paper presents a method of analysis for structures of industrial halls of steel with Finite Element Method and ANSYS software. Using modern methods of analysis has the advantages of reducing working time to design and optimize the structure if necessary. The steel structure was studied for two load cases: the snow weight and the seism simulation

CuvinteCheie:
Finite Elements Method, Steel Structure, Civil Engineering, ANSYS


Titlu:
NUMERICAL FLOW SIMULATION APPLIED TO FLOW METERING

Rezumat:
With the increase in natural gas consumption worldwide, there is a noticeable increase in interest in improving the accuracy of the corresponding flow metering. The knowledge of accurate energy flow is essential for the transport, distribution and billing within the gas industry. To this end, the present paper will discuss the opportunities given by numerical flow field simulations in flow metering configurations


Titlu:
OPTIMIZATION OF CUTTING CONDITION ON A VERTICAL MILLING MACHINE USING VIBROMECHANICAL ANALYSIS

Rezumat:
Although most of the vibrations are unwanted, over time researchers were able to use them for prolific purposes, in the diagnosis processes of industrial machines. Using vibromechanical diagnosis one can detect the ensuing malfunctions allowing him to undertake actions to optimize the industrial process, in this case the process of cutting. This paper presents an optimiza-tion scheme of cutting conditions for parts used to obtain hydraulic turbine models, using vibromechanical analysis on the vertical milling machine in three axes DMC 635


Titlu:
NUMERICAL MODELING OF THE CHARPY TEST, AN IMPROVING WAY OF  OBTAINED RESULTS BY THE EXPERIMENTAL METHOD

Rezumat:
Nowadays, the numerical modeling of the behavior of different materials has a great importance for analysis of the structure responding, especially over the elastic limit and under dynamic conditions. There are some material models used in finite element analysis, like Johnson-Cook, Simplified Johnson-Cook, Krieger (Cowper-Symond), Picewise-linear plasticity, Needleman-Tvergaard, Zerilli-Armstrong, Shirakashi-Vinh etc. For using of these material models, we have to know the material constants – a very important problem. Numerical simulation being used, in a good concordance with the experiment, a lot of studies can be made regarding to a material class, upon influence of different material constant on the simulation result and even to put in evidence how we could improve the material properties under dynamic loading. The study, presented in this work, is based on Ls-Dyna code and on some material models, most used in our opinion, like plastic-kinematic, Johnson-Cook and Picewise-linear plasticity. The Charpy test – an experimental dynamic test – can be modeled using such material models. After a right numerical modeling of this test, having a much closed result with the experiment, we could obtain a lot of information about the influence of different material constants upon the numerical results

CuvinteCheie:
Charpy, dynamic test, material model, material constant


Titlu:
A PERSPECTIVE OF MECHANISM AND MACHINE SCIENCE FROM THE PAST TO THE FUTURE

Rezumat:
Mechanism and Machine Science (MMS) has been the core of mechanical engineering and indeed of industrial engineering since the beginning of engineering practice and particularly in modern times. A historical short survey is presented to outline the main characteristics of mechanisms and their evolution also with the aim to identify challenges and role of MMS in future de-velopments of Technology for the benefit of the Society. The significance of IFToMM, the International Federation for the Promotion of MMS is also stressed as the worldwide community that in the last forty years has contributed to aggregate common views and developments and can have a important role for future improvements yet. Modern systems specifically with Mechatronic de-sign and operation still need a careful attention from mechanism design view-points to properly achieve the goals of helping or substituting human operators in their activity

CuvinteCheie:
mechanisms, machine science, history of machinery


Titlu:
STUDY ON STRATEGY FOR REMOVING ALL THE UNWANTED  REQUENCIES PROVIDED BY KNOCK SENSOR COEFFICIENT

Rezumat:
The most common device used for detonation detection is a piezoelectric transducer. Vibrations from the engine cause the seismic mass to compress the crystal and therefore produce a voltage signal proportional to the changing force. The sensor will detect all engine vibrations, so after amplification, the signal is filtered to remove all the unwanted frequencies, leaving only those that are produced by detonation or knocking

CuvinteCheie:
tuning, strategy, simplification, knocking, automotive


Titlu:
MICROBIAL RECOVERY OF COPPER FROM ELECTRONIC SCRAP BY MIXED CULTURE OF MESOPHILIC BACTERIA

Rezumat:
Bioleaching processes were used to mobilize metals from electronic scrap (printed circuit boards - PCBs). The bacteria Acidithiobacillus ferrooxidans (A. ferrooxidans) and Acidithiobacillus thiooxidans (A. thiooxidans) isolated from an acidic mine drainage were grown and acclimated in presence of PCBs and then used as bioleaching bacteria to solubilize metals from PCBs. Optimum conditions were: pH 2.3; temperature, 35 oC; and ferric iron concentration in the range of 0.004 to 0.02 M. The energies of activation were determined to be 11.7 kcal (ca. 4.8 × 104 J) per mol. It is concluded that A. ferrooxidans and A. thiooxidans were able to grow in the presence of PCBs and the mixed culture of A. ferrooxidans and A. thiooxidans can not only efficiently bioleach the main metal copper.

CuvinteCheie:
bioleaching, electronic scrap, copper, Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans


Titlu:
ECO-EFFICIENCY CONSIDERATIONS ON THE END-OF-LIFE OF CONSUMER ELECTRONIC GLASS DOMINATED PRODUCTS

Rezumat:
In order to improve the eco-efficiency at the end-of-life phase of consumer electronic products, comprehensive assessments should be made. The eco-efficiency method is applied to aim at minimal end-of-life treatment costs against maximal environmental recovery. In this paper, the outcomes of this eco-efficiency concept are presented based on a range of improvement options like changing shredding and separation settings, plastic recycling, glass recy-cling, or separate sorting of certain products. From there, the evaluation takes place of technical improvements in relation to current best-practice recycling. Even more, with the eco-efficiency method it is made possible to select and rank improvement options of current and future end-of-life processing and to deter-mine which options bring substantial environmental gain in relation to financial investments made. For glass dominated products, an increase in glass recycling results in significant environmental improvements. Other conclusions and out-comes are that plastic recycling seems only eco-efficient for large housings of appliances already undergoing disassembly due to the presence of a cathode ray tube (CRT). In general, it is shown that the various options to increase the eco-efficiency of end-of-life systems lead to very mixed environmental and eco-nomic results. As a consequence, end-of-life policy strategies should be evalu-ated, and in some cases revised, to support and enhance the most eco-efficient improvement options

CuvinteCheie:
eco-efficiency, recyclability, WEEE, glass dominated products


Titlu:
RESPONSE STATISTICS OF NONLINEAR OSCILLATORS UNDER WHITE NOISE EXCITATION

Rezumat:
Difficulties inherent in handling nonlinear random vibration problems are well known. While some particular exact solutions are available for specific systems under white noise excitations, many practical problems have been handled by approximate approaches such as linearization and closure assumptions. Even in these approximate procedures estimation of non-Gaussian characteristics of the responses, joint density functions and the power spectral density of response functions pose difficulties. In this paper, a new method is proposed in order to evaluate the stochastic solution of linear random differential equation. The idea was to derive suitable linear differential equations for the nonlinear terms. This way the non-linear terms in the original system get replaced by linear transformations with memory. The power spectral density of response functions so obtained show non-linear features such as multiple resonant peaks. The present paper aims to carry forward the previous investigations of the authors

CuvinteCheie:
Non-linear system, white noise, response, equivalent linearization, random vibration


Titlu:
THE POWER SPECTRAL DENSITY OF RESPONSE FOR NON-LINEAR OSCILLATORS WITH THE NONLINEAR DAMPING FORCE

Rezumat:
In many practical applications the system of concern is nonlinear. In general, and especially in random vibration analysis, it is difficult to obtain a closed form solution for the dynamic response of a nonlinear system. Therefore, it is necessary to replace the nonlinear system with an equivalent linear system. Method of equivalent linearization has been extensively used in these engineering applications. The first part of this document consists of a detailed description of some of the most common types. The method of the stochastic equivalent linearization is based on the idea that a nonlinear system may be replaced by a linear system by minimizing the mean square error. This method has seen the broadest application because of their ability to accurately capture the response statistics over a wide range of response levels while maintaining relatively light computational burden. The method will be briefly discussed in the following sections. Fundamental theory of this linearization procedure can be found in Caughey, Roberts and Spanos. To illustrate the procedure of equivalent linearization theory, we let us consider the following oscillator with a nonlinear damping force component

CuvinteCheie:
Random vibration, non-linear system, stochastic linearization, power spectral density, probability theory


Titlu:
A SECOND ORDER EXTENSION OF EULER EQUATIONS

Rezumat:
We consider some canonical extensions of first order Lagrangian and non-Lagrangian systems to some second order Lagrangian and non-Lagrangian systems respectively. These extensions are considered at the level of accelera-tions and velocities. Considering the Euler equations as a non-Lagrangian sys-tem, a second order extension of this system is obtained. We prove that the new equation corresponds to a Legendrian of first order

CuvinteCheie:
Euler equations, second order extension, non-Lagrangian system


Titlu:
A GEOMETRIC DISCRETE MODEL FOR THE SECOND ORDER SYSTEMS

Rezumat:
If M is a manifold, then M2=M×M is a model for TM, the tangent space of M (or the space of velocities) and M3=M×M×M is a model for T2M, the second order tangent space of M, or the second osculator space (the space of accelerations). A second order discrete Lagrangian is a function L: M3→IR. The discrete Euler-Lagrange equation of L can be given by a variational prin-ciple and the solutions can be put in correspondence with generalized trajecto-ries in T*M. The Legendre map of L can be also considered. One study some properties of right and left hyperregular discrete Lagrangians. Some examples of second order discrete Lagrangian systems are considered. Some new facts, that are not encountered in the first order case, are discussed

CuvinteCheie:
Discrete Lagrangian system, discrete Euler-Lagrange equation, discrete trajectory


Titlu:
A COMPARATIVE STUDY CONCERNING THE TRANSVERSAL DISPLACEMENTS FIELDS OF A THIN PLANAR PLATE HAVING A LINEAR ELASTIC BEHAVIOR VERSUS A THIN PLANAR PLATE

Rezumat:
This paper presents firstly the mathematical model for the transversal vibrations of a thin planar plate having a linear elastic behavior versus a thin planar plate having a viscoelastic behavior. Both plates are considered making general motions of simultaneous translation and rotation. Each of those plates could be considered as being a kinematic element of a certain kinematic linkage. Using the Laplace integral transformation and the double Fourier sinus transformationt fitting with the simple boundary conditions that are considered for each plate, the transversal displacement field is found for each type of plate. This way, the obtained mechanical and mathematical models could very well be used to study the vibrations of car bodies. A specific numerical case is presented. Finally, a comparative study between the two elastic behavioral cases is presented


Titlu:
NEW STEADY-HAND EYE ROBOT WITH MICROFORCE SENSING AND SERVOING FOR VITREORETINAL SURGERY

Rezumat:
Vitreoretinal surgeons use tubular instruments to manipulate delicate tissue inside the eye, by applying imperceptible forces while avoiding damage to the retina. We present here a system designed to enhance surgical performance by measuring these forces directly at the tool tip, in order to robotically regulate the forces applied by the surgeon. The system is based on a new generation of a cooperatively controlled microsurgery robot with a remote center-of-motion (RCM) mechanism. It integrates a custom microforce sensing surgical hook to provide conventional surgical function as well as force limiting, force scaling, force setting, and auditory feedback to the user. System experiments on phantom models identify some of the dynamic characteristics of vitreoretinal membrane peeling operations and quantify the range of forces associated with it

CuvinteCheie:
vitreoretinal membrane, microforce sensor, microsurgery, teleoperation, epiretinal membrane


Rezumat:
This paper presents the advantages and features offered by Delmia V5 software for the simulation of manufacturing processes and industrial robots programming. The paper focuses on a detailed presentation of the Delmia V5 software, one of the most complex robot simulation software packages avail-able. The key features of this software simulation package are highlighted through a case study involving a manufacturing cell which produces parts for the automotive industry

CuvinteCheie:
robot simulation, Delmia, process simulation


Titlu:
EXPERIMENTAL RESEARCH REGARDING THE AUSTENITIC STAINLESS STEELS WITH CRYOGENIC RESISTANCE

Rezumat:
The paper presents the results of the experimental research regarding the elaboration and physical-mechanical properties of the austenitic steels with small amounts of nickel, also allied with manganese, to reduce the content of Ni. The mechanical and plastic properties at cryogenic temperatures were also studied and are critically presented


Titlu:
EXPERIMENTAL RESEARCHES UPON TUBE IN TUBE HEAT EXCHANGERS PERFORMANCES TYPE

Rezumat:
The basis for the paper is the experimental research made on four tube in tube type heat exchangers, two of lis tube type, one of internal rough tube type and one of external rough tube type, in which the worm fluid, for work, is circulating inside the heat exchanger. This research represents a new perspective in the Romanian technical literature.

CuvinteCheie:
tube in tube type heat exchanger, heat flow, air flow


Titlu:
THE USE OF THE FOUR-BAR MECHANISM TO THE AIR VEHICLES’ FLAPPING WING

Rezumat:
In this paper, the energetic of a flapping wing micro air vehicle is analyzed with the objective of design of flapping wing air vehicles. The salient features of this study are design of an energy storage mechanism in the air vehicle similar to an insect thorax which stores part of the kinetic energy of the wing as elastic potential energy in the thorax during a flapping cycle [1]


Titlu:
FLEXIBLE MANUFACTURING APPROACH OF A PART IN AN INTEGRATED MANUFACTURING ENVIRONMENT

Rezumat:
The paper presents the machining process with NC programs of a representative part for a grouped technology, viewed in a computer integrated manufacturing system. The manufacturing conception of the part was developed according the flexible manufacturing system principles, optimizing the total length of tool paths with SURFCAM program and pallets using

CuvinteCheie:
flexible manufacturing system (FMS), computer integrated manufacturing system (CIM), machining process


Rezumat:
A mechanical anthropomorphic structure, with bars and gears, having four degree of freedom, (dof), redundant, able to avoid obstacles was used as a basis. The constituents of the command and control system of kinematics and dynamics parameters are presented

CuvinteCheie:
Didactic Redundant Manipulator, Monitoring, Kinematics Parameters, Dynamic Parameters


Titlu:
MODELING AND SIMULATION OF A DIDACTIC MANIPULATOR-ROBOT WITH HELP CATIA SOFT

Rezumat:
This paper presents the stages of constructive modeling and simulation of a didactic robot type serial with the R┴RװRװR as geometric structure. In the first part we look at the 3D modeling of the component pieces of each of the kinematical elements in the make-up of a serial robot. Then the components are assembled in distinct kinematical elements, next the assembly of these in the final configuration of the robot is done. In the second part of the paper is realized the kinematic simulation of the didactic robot, with the help of a „DMU Kinematics menu”, then with the help of the option „Generate an animation File” the robot animation is obtained


Titlu:
CAPTURE, TRANSPORT AND GEOLOGICAL STORAGE CARBON

Rezumat:
Climate change is one of the main challenges of the contemporary world. The European Council expressed its firm commitment to reduce 2020 GHG emissions with at least 20% compared to 1990 levels. The new power blocs, which will be built in the future and will work on solid fuel will be designed and constructed solution "capture ready". An energy block can be considered "capture ready" if the one time in the future, may be modified to integrate the technology of capture, transport and storage of CO2. So far we know two technologies for the capture of carbon dioxide which developmental stages are very close to scale demonstration: oxi-combustion and post-combustion. The principle is to change fuel technology Oxi-combustion that the burning fever was air in a given pure oxygen, combustion chemical equations are the same as those of conventional combustion. Worldwide oxi-combustion technology has reached the pilot stage of industrial development the next stage of technology demonstration of the scale. The principle of post-combustion technology for carbon dioxide retention is a technology emerging from two technical invoice analogues: the use of similar facilities used in other industrial fields, used for many years and wish to have a facility that can be mounted directly flue gas channels of a new or existing power plants, such an installation of desulphuriza-tion. Post-combustion technology requires further research and validation of the technology scale demonstration, the main problem was very high energy con-sumption, which greatly reduces the overall efficiency of the power plant. To achieve the necessary compression of CO2 transport in a high pressure (approx. 110 bar) so as to ensure that the entire length of the route will not change the physical state of gas and also will cover related pressure losses.
 Possible locations for storing carbon dioxide are depleted oil fields, the former gas fields, deep aquifers, deep layers of coal under great untapped geothermal wells, cavities remaining coal mines and salt depleted

CuvinteCheie:
geological storage CO2, oxi-combustion, post-combustion, CO2 "dense phase", depleted oil fields, cavities remaining coal mines


Titlu:
CURRENT SITUATION IN THE FIELD OF ELECTRICITY PRODUCTION TECHNOLOGIES – CLEAN TECHNOLOGIES

Rezumat:
In this paper are presented some types of technologies to produce electricity which does not rely on fossil fuel consumption, as well as their present stage of development


Rezumat:
In this paper are presented some of the most important sources of industrial pollution and especially the sources of pollution by sulfur oxides. Are also present methods to reduce emissions of sulfur dioxide and within is presented non-regenerative wet process mechanism of the desulphurization of flue gas

CuvinteCheie:
pollution, sulfur, non-regenerative wet processes


Titlu:
ANALYSIS OF PRIMARY AIR FLOW INSIDE A BURNING COAL DUST WITH F.E.M.

Rezumat:
Using finite element method (F.E.M) to study polyphase mixture flow (atmospheric air + flue gas + coal dust) by burner of coal dust of a high-powered boiler, allows calculation of the movement dynamics of coal dust particles, determining the density and mass flow along the channel to exit through the slit burner in the boiler. It can cause changes in velocity, temperature and pressure burner channels, areas of the fluid path, which promotes turbulent flow of the mixture analyzed. Following the analysis, conclusions can be drawn on how it was designed for burning coal dust and identify technical solutions that can be applied to the redesign of coal dust burners boilers older generations to be subject to rehabilitation and modernization

CuvinteCheie:
Finite element method, polyphase mixture, coal dust, turbulent flow, coal dust burn-ers, mass flow rates, flow, temperate, mixed pressure polyphase


Titlu:
ABOUT THE VIBRATIONS OF THE AMBIELAGE FROM A V-TYPE ENGINE

Rezumat:
First, in this paper it is presented the mechanical model of an ambielage from a V- type engine, which is submitted to lateral and longitudinal vibrations. Using the mathematical model of the vibrations of a linear-elastic connecting-rod, adapted for the case of the ambielage from a V-type motor and using integral transforms, the laws of the vibrations for its linear-elastic connecting-rod, in a first approximation, are obtained. Finally, ending the repetitive process at the third approximation, the definition law for the lateral and longitudinal vibrations of the connecting-rod are obtained. With the help of Mathematica program, the graphical representations of the definition laws are can be obtained

CuvinteCheie:
ambielage, connecting-rod, internal combustion engine


Titlu:
CONSIDERATION ABOUT VIBRATIONS OF THE THICK PLATES

Rezumat:
In this paper is made a study about vibrations of a plate, on condition that the plate thickness doesn’t allow to verify theKirchhoff’s fundamentals concerning the bending motion. To this purpose, it is necessary a more complete theory based on the Timoshenko beams one. First, are determined the displacements field and the unit deformations tensor. Then the deformation mechanical work and the kinetic deformation energy are obtained. Finally, using the Hamilton’s principle, the motion equations of the thick plate result

CuvinteCheie:
vibrations, deformations tensor, thick plates


Titlu:
SOME APPLICATIONS FOR WOHLHART MECHANISM

Rezumat:
The paper presents some possible applications for a special class of overconstrained mechanisms. In the large family of overconstrained mecha-nisms we consider only the close-loop mechanisms with revolute joints and more precisely with six revolute joints. In a very special spatial disposition the movements of this particular class of overconstrained mechanisms changes. We impose three of the six revolute joints to remain in a fixed horizontal plane. The others three joints will define another plane. This plane will be always parallel with the fixed one. For this spatial disposition some possible applications are presented


Titlu:
KINEMATIC ANALYSIS OF A HUMAN ANKLE JOINT PROSTHESIS

Rezumat:
In this paper we follow to elaborate a new prosthetic mechanical system which will substitute the human ankle joint. This mechanical system will have a cam mechanism in order to accomplish the ankle joint motion. The new prosthetic mechanical system design will be accomplished by performing a kinematic analysis on analytical way. The designed prosthetic mechanical system will be experimentally tested on a human subject with locomotion disabilities

CuvinteCheie:
modeling, kinematics, shank prosthesis, cam mechanism


Titlu:
AUTOMATIC CONTROL OF THERMODYNAMIC PARAMETERS OF THE MICRO CHANNELS HEAT EXCHANGERS

Rezumat:
The paper presents the realization of an experimental model for cooling of microprocessors with automatic control of thermodynamic parameters of the micro channel heat exchanger. For determining the efficiency of cooling system of microprocessors we used two specialized software, one for measuring thermal parameters of laser pyrometers, type Optris Temperatura and a soft-ware for determining the function of parameters of the computer, type Everest

CuvinteCheie:
microprocessor, micro channel heat exchanger, temperature


Titlu:
CASE OF STUDY FOR THE IMPLEMENTATION OF HYBRID ENGINES IN ROMANIA

Rezumat:
This paper presents a new direction of study in the way of solving the main problem of the world regarding the automotive industry and first steps made by Romania. The aim is to become more environments friendly and to try to spare the ground resources which started to decrease obviously in the last years due to the accelerated industrialization. In the first part is presented the evolution of the internal combustion engines from the appearance until nowadays and the eventually solutions found once with the increasing of car number and the awareness of their use. The last part is a report of the new ideas and their implementation in Romania

CuvinteCheie:
Pollution, gasoline, diesel, biodiesel, hybrid car, electric car


Titlu:
CHANGES IN THE TECHNOLOGICAL PARAMETERS OF THE DRYING PROCESS OF GRAIN AND TECHNICAL PLANTS IN A FLUID BED

Rezumat:
In the paper there is presented a set of experimental data obtained from a plant model for drying seeds with apparatus and auditing systems and command of the parameters of process. For each moderate determination there were registered the initial and final parameters, as well as the sizes prescribed to defend against the measurements and check


Titlu:
CONSTRUCTION AND KINEMATICS OF THE MAIN GEAR REDUCERS OF HELICOPTERS

Rezumat:
The paper presents some general aspects concerning the use of
planetary mechanisms in building of the main reducers of helicopters and tilt rotors. There are presented the constructive solutions of some main reducers/ transmissions that include planetary mechanisms, along with the kinematic schemes of these reducers and the relations for calculating of the transmission ratios. There are shown the main parameters and some constructive particularities of the reducers

CuvinteCheie:
helicopter, gear reducers, turbo-gas engines


Titlu:
KINETIC ENERGY VARIATION IN PROCESSING OF PARTS BY CENTERLESS GRINDING WITH CROSS FEED

Rezumat:
This paper presents an analytical method for calculating kinetic energy during the grinding process without the advance across centers. Kinetic energy change affects the speed of adjustment of parts. With this variation the change surface quality and precision parts rectified

CuvinteCheie:
centerless grinding, kinetic energy, cutting force, speed, quality


Titlu:
INFRARED THERMOGRAPHY COUPLED WITH REVERSE PROBLEM AT FINITE ELMENT ANALYSIS

Rezumat:
This paper presents a way to mix the infrared thermoghraphy with the reverse problem in finite element analysis. The infrared imaging is used to derive the instant distribution of thermal field in cutting process, so the nodal values corresponding to a predefined mesh. These nodal values, in fact solutions for Poisson equation, are introduced in a special program based on variational approach for heat transfer. This program computes the value for internal source corresponding to the measured distribution, so we can handle better the cause of thermal phenomena in cutting process

CuvinteCheie:
infrared thermography, heat transfer, finite element analysis, regression analysis


Titlu:
INTERNAL DATA ACCESS BASED ON ARX LIBRARY AND MFC

Rezumat:
the paper presents the key elements used to access internal data structure from Mechanical Desktop, using the facilities given by ARX library; these techniques are exposed for an example which uses also the MFC capabilities connected to ARX ap-plications


Titlu:
ASPECTS ON THE RISK REDUCTION AT MACHINERY IN THE DESIGN STAGE

Rezumat:
The paper deals with some aspects regarding safety requirements for machines, typical hazards, the basic concepts of the risk assessment and reduction and it refers to relevant standards, regulations and best practices relating to the safe design and use of machinery and equipment. The paper also shows some techniques to ensure a high level of reliability of the machine and its com-ponents at the early design stages which lead to a safe operation of a machine or equipment

CuvinteCheie:
machine, design, risk, safety, risk assessment


Titlu:
ASPECTS ON APPLYING OF QUALITY FUNCTION DEPLOYMENT METHOD TO PRODUCTS DESIGN AND ITS RELATIONSHIPS WITH OTHER VARIOUS DESIGN TOOLS AND METHODS

Rezumat:
The paper deals with some aspects related to QFD (Quality Function Deployment) method such as the House of Quality and its building, used at products designing. It presents how QFD can improve your product develop-ment process by focussing on customer expectations. The paper also shows OFD’s relationships with other various design tools and methods (the Kano Analysis, TRIZ methodology, Taguchi’s method, Kansei Engineering), combina-tions that strengthen the quality deployment process as the synergy between QFD, TRIZ, and Taguchi’s method.

CuvinteCheie:
quality, product design, voice of customer, house of quality


Titlu:
THE EFFICIENCY OF TRAINING PROGRAMS IN THE PRODUCTION AREA

Rezumat:
In today’s production organizations, cross functional skill development is encouraged. In order to increase person-job and person-organization fit, one strategically element can be introduced in the human resources strategy: training and development program

CuvinteCheie:
training, learning and development, human resources strategy, blue collar employees, organizational culture


Titlu:
INFLUENCE OF THE  ADDITIONAL LOADS ON THE DISTRIBUTION OF THE VERTICAL FORCES AT THE VEHICLE WHEELS

Rezumat:
Based on the auto vehicle motion mathematical model are determined the vertical reactions for the four wheels. For this, it is considered the masses which load supplementary the auto vehicle, the accelerations on the transversal and longitudinal direction, the turning kinematical parameters. It is presented the variations of these forces relative to the trajectory parameterization and the angle between the longitudinal axis and the velocity of the auto vehicle theoretical mass centre. It is outlined the effect of the mass centre position modification on the vertical forces distribution. These effects are presented in the rectilinear and circular motion cases emphasizing the differences which appear than the case in which the loading is uniformly distributed and does not influence the theoretical mass centre position. In the case of the turning with constantly velocity, it is produced an increase of the vertical forces more closed by load mass centre than in the case of auto vehicle without supplementary loads. It is presented the variations of the vertical forces during the turning mo-tion. It is evidenced the influence of the suspension damping and rigidity char-acteristics on the evolution of the vertical reactions taking into account the roll and pitch oscillations. It is shown that the vertical reactions limits do not de-pend on the suspension characteristics.


Titlu:
INVESTIGATIONS OF TENSION-TENSION PRE-STRESS EFFECTS ON GLASS REINFORCED COMPOSITE PLATES UNDER THE LOW-VELOCITY IMPACT

Rezumat:
In this study, determined of tension-tension pre-stress effects on damage of glass reinforced composite plates under the low-velocity impact. The sample was prepared as a Epoxy-Glass fiber reinforced composite [0 / 90] 2s orientated, 8 layered symmetric composite plate and it’s average thickness is 2mm. The sizes of the samples are taken as 140x140mm. The impact tests were conducted with a specially developed vertical drop weight testing machine. After applying 2kN, 4kN and 6kN of unloaded and pre-stressed tension-tension forces, impact tests were made under 23.6 Joule energy. Force-time data obtained from experiments and calculated values were given in forms of graphs

CuvinteCheie:
Low velocity impact, composite materials, pre-stress


Titlu:
APPLYING THE HEURISTIC STEP METHOD IN THE INNOVATIVE PRODUCTION MANAGEMENT

Rezumat:
Sustaining the innovative production within a company implies sustaining the growth of its creative activities. This article presents some aspects connected to the application of an intuitive and logical method for technical creation - the method of heuristic approach - to the conception of new products. Working methods are proposed for the steps to be followed and suggestions are made for establishing the individual basis of creative approach

CuvinteCheie:
conception, innovation, patent, heuristics, research


Titlu:
STUDY REGARDING THE COSTS RELATED WITH THE CONSTRUCTION OF A BIOGAS PLANT FROM USING ANIMAL RESIDUES

Rezumat:
In the paper are analyzed all the potential costs that can be involved in the construction of a biogas plant from using animal residues. The paper is based on a real model connected with experimental research and the presented values are approximated according to the type and dimensions of the biogas plant. The drawn conclusions are constructive related with the design and development issues.

CuvinteCheie:
biogas plant, animal residues, operation costs


Titlu:
SOME CONSIDERATIONS ON MECHANICAL PROPRIETIES FOR COMPOSITES MATERIALS

Rezumat:
This paper presents an approach of quality index for composites materials based on resins and unclothes textile fibers. The results were obtained experimentally by making measurements over tensile strength, delaminating strength and tearing strength

CuvinteCheie:
new materials, composites, resin, pre-polymerized wadding


Titlu:
DYNAMIC ANSWER AND EXPERIMENTAL RESEARCH CONCERNING THE MECHANISMS OF MOWERS MACHINE

Rezumat:
In this paper we present the dynamic answer modelling, with the dynamic models method and after that using the finite element method, for an ex-perimental mechanism used to mowers machine. The proposed mechanism is RTR-TRT type. The paper is structured in three parts. In the first part we pre-sent the stage to day of the various type of mechanism used as design solution to the cut-off systems of the mowers machines. We present the kinematic scheme of the proposed mechanism as a structural equivalent mechanism, following the structural and geometric synthesis. In the second part we present the mecha-nism’s kinematic model and we perform a dynamic calculus. With this we obtain the kinematic parameters variation laws in dynamic regime, and also other dy-namic parameters. In the last part of the paper is presented the finite element analysis in dynamic regime, using as input law for the load, the motor torque obtained by experimental analysis. It is presented the finite element analysis re-sults: stress, strain and displacement distribution for the 3D model


Titlu:
EXPERIMENTAL RESEARCHES CONCERNING POLLUTING EMISSIONS FROM MOTOR VEHICLES, TRAFFIC CONDITIONS, WITH AND WITHOUT AIR CONDITIONING FUNCTION

Rezumat:
In the paper are presented experimental results obtained by testing several cars by simulating
traffic conditions, on stand with rolls, on the variants: air-conditioning system coupled and is connected. Actually have been observed during other research that besides the loss of power and increased fuel consumption, coupling / decoupling the climatic system, affect appreciably air pollutant emissions, this influence is manifested differently than one might think in theory, so it was made a series of systematic attempts to know which are the quantitative changes of different species pollutants

CuvinteCheie:
emissions, internal combustion engine, traffic, air-conditioning system, chassis dynamometer


Titlu:
ISSUES CONCERNING THE STUDY OF PRESENT ENGINE’S INTAKE MANIFOLDS

Rezumat:
The paper presents a study concerning the importance of the gas dynamic role of the
intake manifolds that equip the present engines. The manifolds can be optimized according to these studies which show the uniformity of the air flow through the individual manifolds of the intake assembly and their degree of filling. The syntethical parameter that shows the degree of
optimization of these manifolds is dethermined through computer CFD simulations using software that allows the determination of the air flowing characteristics toghether with the degree of individual manifolds filling. After the CFD simulations that allows a first intake manifold sample very close to the expected result, the intake manifold’s air flow parameters are tested on the test bench, thus reducing the amount of time and costs in order to obtain an optimized final part

CuvinteCheie:
intake manifold, air flow, uniformity, filling degree, performance, CFD

Obs:
Formatata necorespunzator 2 coloane etc. - KKT


Titlu:
RESEARCH REGARDING THE ROUGHNESS OF THE SURFACES TITANIUM ALLOYS TURNING

Rezumat:
This paper presents the results of some experimental research regarding the roughness of the surfaces for titanium alloys (TIAl6V4, TiAl5Fe2.5, TiMo33) in the case of the turning process using tool carbide type K20.

CuvinteCheie:
Titanium alloys, turning, roughness surfaces, linear functions, analysis regression


Titlu:
STUDIES CONCERNING THE ROUGHNESS OF THE SURFACES IN THE CASE OF STAINLES STEEL MILING

Rezumat:
In this paper are presented some of the obtained results concerning the roughness of the surfaces in the case of milling process for a stainless steel (20Cr130, 20Cr12Ni)

CuvinteCheie:
stainless steel, milling, roughness surfaces, linear functions, analysis regression


Titlu:
INFLUENCE OF ASYMMETRY COEFFICIENT VARIATION UPON THE STRESSES FROM THE CRACK TIP TO AN AXIAL ECCENTRIC FATIGUE SOLICITATION

Rezumat:
The stresses field from the tip of a crack by axial eccentric fatigue fracture depends upon the way of solicitation, pieces or sample material, degree of load, sample geometry. Attaching an axis system (xyz) on the crack front, and respecting the conditions of a plane stress state, the stress field is expressed by the components σx, σy and τxy, (σz=0). The tests program was realised on 10TiNiCr175 alloy steel samples, CT model. These was tested until fracture, to fatigue, with the asymmetry coefficients R=0.1, R=0.3 and R=0.5. During the realised tests on ambient temperature, we have noted the crack length a, and the corresponding number of cycles N. At any moment of the tests, we have calcu-lated the stress intensity factor ΔK, and the stresses on the crack front σx, σy and τxy,, respectively the normal principal stresses σ1, σ2 and the stress σc to the composed solicitation by traction and bending of the sample. We have repre-sented the graphics of variation of all stresses, versus the variation of the crack length a, durability N and versus the stress intensity factor ΔK, for those three loads coefficients

CuvinteCheie:
fatigue, crack, asymmetry coefficient, stress intensity factor, durability


Titlu:
INNOVATIVE ELEMENTS FOR AUTO VEHICLE STEERING SYSTEMS

Rezumat:
This paper provides information about two automotive innovations that have been developed and tested over the past few years, in order to improve the steering systems. It consists of a short description of the steer-by-wire system and the electric power steering, mentioning their most important technical characteristics and also showing their improvements compared to the classic power steering.

CuvinteCheie:
steering system, electric, hydraulic, feedback, torque


Titlu:
COMMUNICATION SYSTEMS IN TRANSPORTATION CAR TO CAR COMMUNICATION SYSTEM - INTRODUCTIVE STUDY

Rezumat:
Transport telematics means the integration and implementation of telecommunications and information technology in the transport industry in a manner that they penetrate into all areas and modes of transport, vehicles and infrastructure, organization and management of transport and connection with transport users and society a whole. This paper describes problematic of wire-less car-to-car and car-to-road infrastructure communication system


Titlu:
ANALYSIS OF THE COMMAND SYSTEM FOR ADAPTIVE ADMISSION AT HEAT ENGINE

Rezumat:
The paper presents the calculus method at the projection of an hydraulic command system used at adaptive heat engines, at which the adjusting of the pressure ratio and the adjusting of the lift is made automatically while functioning. So, in the paper is shown the calculus method of the pressure adjusted from the command system using the design values of the oil – feed pump used at the experimental engine, and its working condition (load and rotative speed). Also it’s presented the command system’s design calculus and the hydraulic system’s oil feed pipe calculus

CuvinteCheie:
hydraulic command system, adaptive heat engines, rotative speed, viscosity, pressure


Titlu:
CONTRIBUTIONS AT HYDRODYNAMIC CALCULUS OF HYDRAULIC ENGINE SEGNER

Rezumat:
The purpose of this paper is to build a hydrodynamic theory for hydraulic engine SEGNER starting from the general equations of dynamic fluid in non inertial reference frame. The paper can be used at the calculus of centrifugal oil filters for car diesel engines

CuvinteCheie:
hydrodynamic, centrifugal oil filters, hydraulic engine, pressure, relative speed


Titlu:
RANDOM VIBRATIONS OF THE KINEMATIC CHAINS WITH FLEXIBLE ELEMENTS

Rezumat:
The purpose of this work is to determine the characteristic of the random vibrations for mechanical models with distributed mass, in izotermal conditions. It is considered the particular case of a plane translation to avoid unless complication. The Laplace transform in time and Fourier finite transform in sine are used

CuvinteCheie:
random vibrations, Laplace transform, Fourier Finite Transform in sine


Rezumat:
The paper presents in a synthetic manner the analogy of the values, equations and the circuit elements from the electric, mechanic, hydraulic, pneumatic and acoustic fields, analogy that allows the replacement of some base structures and complicated circuits and systems with some equivalent circuits that facilitate the gather of data and the simulation concerning the dynamic processes from the mentioned fields. Having as starting point the definitions of the base parameters from these fields and with respect to the chosen analogy, one can obtain the calculus formulas corresponding to the various types of simple resistances or their connection. The resulting data is shown in the analogy tables corresponding to the mentioned fields, for the values, base equations, circuit elements and base structures, outlining equivalent schemes

CuvinteCheie:
Complementary variables; Operational/Complex Impedance; Admittance; Generalized power/energy; Analogy types; Modulus and angle of impedance


Titlu:
CONTRIBUTIONS TO THE STUDY OF THE GEOMETRIC AND HYDRODYNAMIC CHARACTERISTICS OF AN INJECTION PLANT USED TO HIGH POWER ENGINES

Rezumat:
The present study introduces the geometric characteristics of the injector DLL 140 S10 R of the plant Z.W. used for fast Diesel engines with a unit power of 75-100 kW/cylinder. The relatively high discharge lead to the use of a special plant for fuel and fuel vapour gathering in the research space


Titlu:
HYDROSTATIC TRANSFORMER FOR IRRIGATION SYSTEMS

Rezumat:
This study introduces two versions of HTOCLM functioning as pressure multiplier and serving for the pumping of the water from a river in the irrigation systems; they are single engine/ generator or multi-engine/generator structures, equipped with volumetric hydraulic linear machines with simple action

CuvinteCheie:
Hydrostatic single/double transformer, hydrostatic linear engine, hydrostatic linear generator, hydrostatic characteristics,  irrigable potential


Titlu:
THE CURRENT RESEARCH STUDY IN THE FIELD OF HEAT EXCHANGERS WITH BAYONET TUBE

Rezumat:
The research made in this field have recently shown a great diversity in using the tubes of Field type. Each element consists of tubes concentrically introduced in other tubes with bigger diameters. The outer tubes are connected to the exit box and the inner tubes are connected to the entering box. The heat exchanger of Field type are greatly spread all around the world and are successfully used in different fields


Titlu:
ON THE MODELLING OF CONVENTIONAL VERTICAL AIRFLOW IN SURGICAL OPERATING ROOMS

Rezumat:
Proper air conditioning is helpful in prevention and treatment of diseases. The aim of this paper is to investigate the conventional vertical airflow in a surgical operating room using computational fluid dynamics (CFD) simulation method. The numerical simulation is an efficient tool in optimum ventilation and architectural design of surgical operating rooms

CuvinteCheie:
hospital, surgical operating room, ventilation system, airflow


Titlu:
AN APPROXIMATION SOLUTION OF THE DIRECT LINEAR ELASTIC CONTACT PROBLEM

Rezumat:
Linear elasticity is used extensively in structural analysis and engineering design, often through the aid of finite element analysis, for many engineering materials and engineering design scenarios. The objective of this paper is to determine an approximation solution for the direct linear contact problem between two elastic bodies. The obtained relations can be applied to the evolventic flanks applications in order to calculate the transversal extent of the contact zone and the contact pressure values. Direct extensions to cases of non-isotropy, and to plane and general 3D models are possible

CuvinteCheie:
contact zone, local movement, contact pressure, elastic contact


Titlu:
MATHEMATICAL MODELLING OF HUMAN EYE ROTATIONS AND POSITIONS USING ROTATION MATRICES AND QUATERNIONS

Rezumat:
In order to build a biomechanical model of human eye it is important to understand eye movement physiology. The objective of this paper is to obtain a mathematical model of eye rotations and positions using rotation matrices and quaternions. The determined relations can be applied to construct environments for realistic visualization in anatomy education and surgical training

CuvinteCheie:
human eye, eye rotations, rotation matrices, quaternions


Titlu:
MODELLING OF THE COAL DUST FLOW IN BURNERS OF THE COAL BOILER BY TYPE MAN 510 t/h

Rezumat:
The paper presents the results of some physical quantities that characterize the dynamic flow of coal dust particles in burners of the coal boiler by type MAN 510 t / h, using the Finite Element method (FEM). The numerical simulation is an efficient tool in optimum design of the coal boiler

CuvinteCheie:
coal dust flow, burner, coal boiler, the Finite Element Method


Titlu:
A MODEL OF NEW OR IMPROVED PRODUCT ANALYSIS

Rezumat:
The present study is an attempt at approaching the problem of the product in theistoorary society in an uptodate manner. It brings into discussion the field of multiple and complex crossactions of all the to that are evident throughout the life cycle of the product. It analyses the basic parameters of the pattern that meet the permanently changing need. Theoretic and applied research stages become evident along the decsion taking roifencerns the product and along the pattern objectivization one, as well.The product pattern considers the life cycle of the former as an itinerary commenoijn the research and the revealing of social need up to the product death in the environment by its being recyii reintegrated into nature


Titlu:
SOME CONSIDERATIONS ON DETAIL DESIGN OF INDUSTRIAL PRODUCTS

Rezumat:
Statistical assessment of the probability of failure is presented as an alternative to the use of factor of safety. The emphasis is on a better understanding of the limiting factors associated with the design. Quality and reliability are presented together and distinction drawn between the two. The most common mode of failure for structural components is by cyclic loading or fatigue. During the detail design process the design and selection of each component is verified and information prepared which will enable manufacture to commence

CuvinteCheie:
detail design, components selection, reliability, quality


Titlu:
CONSIDERATIONS ON THE MODELS WITH A SINGLE DEGREE OF FREEDOM IN THE ELASTODYNAMIC ANALYSIS OF PLANE MECHANISMS

Rezumat:
There are known the models with a single degree of freedom from the dynamic analysis of plane mechanisms with rigid elements. Based on the theoretical notions from these models and those from linear elastodynamics, there are established computing relations for the elements characteristic to each model, for the case in which the plane mechanisms contain linear-elastic elements

CuvinteCheie:
dynamic model, linear elastic, plane mechanism


Titlu:
CONSIDERATIONS ON THE STABILITY OF THE SOLUTION FOR THE MATHEMATICAL MODEL OF TRANSVERSAL VIBRATIONS OF A LINEAR ELASTIC PLANE PLATE UNDERGOING A PLANE MOVEMENT

Rezumat:
It is considered as known the mathematical model for the transversal vibrations of a plane plate, linear elastic, undergoing a plane movement. In the paper it is studied the problem of the stability of this mathematical model’s solution, which is reduced to a problem of parametric resonance

CuvinteCheie:
transversal vibrations, stability, parametric resonance


Titlu:
PROGRAMING A 3 AXIS MACHINING CENTRE WITH TOPSOLID - PART I - MODELLING OF PIECES

Rezumat:
In these papers, part I and II, we present some results obtained on Computer Aided Programming of machine tools acquired by a group of students that followed an introductory course in TopSolid 2009 at the Faculty of Mechanics from Craiova and a traineeship in a factory that uses this software in production. Since the using of this software in our area is relatively recent, in the part I of these papers, we have found useful a short presentation of TopSolid software, in order to start focusing on the CAD module. The chosen case study in this paper refers to the modeling of a part that requires the use of the main features of this module and also the use of the main manufacturing processes that usually may be meet on a three-axis machining center


Titlu:
PROGRAMING A 3 AXIS MACHINING CENTRE WITH TOPSOLID - PART II - G-CODE PROGRAMME CREATION

Rezumat:
In this paper we present some results, concerning G-code programs creation, acquired by a group of students that followed an introductory course in TopSolid 2009 and a traineeship in a factory that uses this software in pro-duction. It must also note the involvement of two of our graduate engineers in providing advice on the operation on CNC machines. In this paper the method-ology of G-code creation with TopSolid'CAM module is exemplified starting from an existing model of a piece that requires the use of 2D machining and also the  main manufacturing processes that usually may be meet on a three-axis machining center


Titlu:
STUDY OF A MECHANISM WITH TWO CRANK GUIDE WAYS, WITH STOPS

Rezumat:
The studies star from the rod curve for a mechanism rod-crank. The rod curve includes a zone similar to a circle segment. A new dyad is introduced, so as to get a mechanism with stops. A study is performed with respect to the positions, speeds and accelerations, and one can conclude that the goal for which the mechanism was designed is reached

CuvinteCheie:
mechanism with stops, mechanisms kinematics


Titlu:
THE PARTICULARITIES OF THE TRACTIVE   CHARACTERISTIC FOR THE TRACTORS EQUIPED WITH HYDROSTATIC TRANSMISSIONS

Rezumat:
This paper analyzes a simple closed loop hydrostatic transmission.There are determinated the  main characteristics by the transmission components and the correlation between them.. There is analyzed the theoretical tractive characteristic for a volumic car and then the possibilities of adjusting the hydrostatic transmission and obtaining the tractive characteristics for each type of adjustment, being emphasized the advantages of each type of adjustment of the hydrostatic transmission

CuvinteCheie:
feature traction, hydrostatic transmission,  the regulation of the transmission


Titlu:
DETERMINATION OF DRIVE PERFORMANCE FOR TRACTORS EQUIPPED WITH SUPPLEMENTARY HYDROSTATIC TRANSMISSIONS

Rezumat:
The paper present the traction calculus of the  tractor equipped with an additional transmission – the hydrostatic transmission. The variation of the hydraulically parameters – the working liquid pressure, the hydraulic pump delivery – modify the parameters of the hydraulic motor – the rotative speed of the motor axle, the motor torque – and, also, the traction performances of the tractor. Also wheeled traction performance are influenced by constructive and functional parameters of tractor tires that parameters related to interaction with the ground wheels

CuvinteCheie:
hydraulic parameters, hydrostatic transmission, the traction characteristic, wheels slip curve


Titlu:
MECHANICAL STRENGTH OF THE RTR STRUCTURAL GROUP

Rezumat:
It is made the mechanical analysis of the RTR structural group (rotation-translation-rotation) in order to evaluate the elements’ strength under the dynamic loadings. For this type of structural group it is defined the kinematical and geometrical state. Depending on the inertia loadings, there are obtined the restraints and the section forces in the motion sections of the sliding element. The loadings allow the estimation of mechanical stress, a synthetical parameter for estimating the strength of the mechanism elements. The defined mathemati-cal model will form the base of an automatic calculus program that will allow to be determined the maximum stress and the moment when the mechanical load is maximised

CuvinteCheie:
mechanical strength, loadings, stresses, structural group RTR, mechanisms


Titlu:
A SIMPLIFIED MODEL FOR THE STUDY OF THE VEHICLES  STABILITY

Rezumat:
In this paper is presented a study of car’s stability using a simplified model and a different types of moving are making obvious. This simplified model take in consideration a half of vehicle and the analytical solution is founded for two different analytical cases


Titlu:
THE STUDY OF THE CAR’ S STABILITY USING A SIMPLIFIED MODEL

Rezumat:
In this paper is presented a study of car’s stability using a simplified model and a different types of moving are making obvious. 
The study is applied for velocity’s values witch are content in the stability field, but also for those values of velocity who surpass the critical value of speed

CuvinteCheie:
automotive, simulation, simplified model, critical velocity


Titlu:
CREEP AND DAMAGE OF RUBBERS SURROUNDED BY AGGRESSIVE MEDIA

Rezumat:
The aim of this work is to develop theoretical and experimental procedures for modeling the behavior of rubbers.  The models will be aimed at predicting their durability based on monitoring the processes of diffusion, creep and damage.  Attention is focused on specific industrial problems related to the use of band samples located in aggressive environments. The validation of models for damage evolution under the combined impact of environment, temperature and mechanical stress is a problem requiring a solution of the Flick’s equation by variable diffusion coefficient and using a damage model taking into account the different areas of penetration. To solve these problems a generalization of the models of Ashby and Kachanov is required, which will lead to more complex systems of differential equations

CuvinteCheie:
rubbers, damage, creep, diffusion, coupled problem


Titlu:
BIODIESEL  STANDARD CHARACTERISTICS THAT AFFECT THE ENGINE FUNCTIONING

Rezumat:
Biodiesel refers to a clean burning, renewable fuel, produced from domestic, renewable sources such as soybeans, sunflowers, canola, waste cooking oil and grease, or animal fats (lard). A process known as transesterification, a chemical process where glycerin is separated from animal fat or cooking oil, produces biodiesel. It may be blended with any level of petroleum-based diesel to produce a biodiesel blend. Biodiesel is simple to use, non-toxic, biodegradable, and has little or no sulfur and aromatics


Titlu:
INVERSE DYNAMIC ANALYSIS OF THE FRANCIS TURBINE DIRECTOR DEVICE

Rezumat:
The paper analyzes the dynamic behavior of the director device mechanism of a hydraulic turbine, known also as the wicket gate or governing mechanism of the turbine. In order to identify the dynamic response of the mechanism components, it is applied an inverse dynamic analysis substituted by experimental research and the finite element method. For the dynamic analysis, the formalism Newton-Euler is used, complemented by Lagrange multipliers method. The forces acting in the kinematic pairs in dynamic regime are identified, knowing the driving force and the resistance force, whose variation laws were experimentally determined

CuvinteCheie:
inverse dynamic analysis, finite element method


Rezumat:
Bone is a complex tissue, which requires mechanical stimulation to develop correctly in the body. An implant is a device that is placed within the confines of the body tissue. Biomaterials used in prosthetic devices are designed in order to be used in contact with biological tissues for a long period of time minimizing any adverse tissue reaction. Biomaterials must be chemically and mechanically biocompatible and their mechanical strength must be appropriate for the specific structural function


Titlu:
ASPECTS CONCERNING THE SEVERITY OF FRONT REAR COLLISIONS

Rezumat:
Front-rear collisions are mainly encountered in urban traffic, mostly leaving road crossing or on the motorways. The causes are mostly maladjustment of the safety distance between vehicles reported with traffic speed or inattention driver. Because of very serious effects of these kinds of collisions, especially for the occupants of the “target” vehicle should consider studying the specifics of these kinds of collisions

CuvinteCheie:
front-rear collision, deformation, vehicle speed


Titlu:
MODELING DYNAMIC BEHAVIOR OF HUMAN UPPER LIMB KINEMATIC CHAIN

Rezumat:
The paper presents a dynamic model of the human upper limb considering it as a kinematic chain with 7 degrees of freedom. The bones were modeled in Solid Works, the model of the upper limb obtained being very close as form to the real one. The differential equations obtained were solved using Newton Euler formalism with the help of Maple programs. The reacting forces which appear in elbow joint associated with flexion-extension and pronation-supination movements are determinate as well. The dynamic model provides a good approximation of total weight and mass distribution as well as transmissibility and amortization properties for bones, muscles and joints

CuvinteCheie:
human joints, human upper limb, modeling, dynamic human arm


Titlu:
SOME DYNAMIC SYNTHESIS AND STABILITY CRITERIONS OF THE SPATIAL KINEMATIC CHAINS WITH LINEAR-ELASTIC ELEMENTS

Rezumat:
This paper presents the case of the mechanism with deformable kinematic elements, which are in spatial rototranslation motion. The problem of dynamic synthesis consist in establish the geometry and kinematic of mechanism, thus the vibrations of certain deformable kinematic element   to be stable


Titlu:
CONSIDERATIONS ON BIOMATERIALS AND THEIR USE IN MEDICINE

Rezumat:
The paper intends to present some general features of the biomaterials used in medicine for various types of medical implants in the human body. These types of materials have very interesting mechanical properties which will be specially investigated. As a main tool we shall use in this aim, the computational simulation will be one of the most important. We shall also propose a comparative study among the most spread and used biomaterials, biochips or as scaffolds in the tissue engineering

CuvinteCheie:
biosensors, biomaterials, magnetic materials , computational simulation


Titlu:
KINEMATICAL ANALYSIS OF HUMAN FOOT MOVEMENT

Rezumat:
This study aims to compare the biomechanical characteristics of the Ankle, Heel and Top leg points of the human foot. To elucidate their movements we have used a method of processing video capture. Starting from this video capture and using dedicated software for analyzing the video capture we have obtained the kinematical laws that correspond to the movement. Data were collected while the subject made a step in a direction set

CuvinteCheie:
kinematics, human movement, video capture analysis


Titlu:
CONSIDERATIONS ON ADVANTAGES and CHALLENGES OF COMPLIANT MECHANISMS

Rezumat:
The paper intends to present the advantages and challenges of complinat mechanisms. Compliant mechanisms are single-piece flexible structures that deliver the desired motion by undergoing elastic deformation as opposed to jointed rigid body motions of conventional mechanisms. Compliance in design leads to jointless, no-assembly , monolithic mechanical devices and is particularly suited for applications with small range of motions. We shall also present some compliant mechanisms that are still in initial stages of research and development

CuvinteCheie:
compliant mechanisms, mechanism precision, energy storage, lightweight


Titlu:
THE STEERING MECHANISM MODELING, CONSIDERING THE DEFORMABLE ELEMENTS

Rezumat:
In this paper it is proposed the elastic-dynamic analysis of a steering mechanism from a Matiz automobile for different driving conditions. For pass-ing from the rigid solid to the deformable one it is used the finite elements method. The mathematical models follow the overlapping of the rigid solid mo-tion over the elastic solid one, using as an interface the finite element method. The mechanism is studied as an assembly and the variation laws of the dynamic and kinematic parameters, obtained from the dynamic analysis of the rigid solid motion will represent input data for the finite elements modeling. This paper mainly presents some of the results obtained by modeling this system, especially the pinion rack gearing

CuvinteCheie:
steering, kinematic, deformable, finite element


Titlu:
STUDY OF CURRENT PROGRAM OF PUBLIC PASSENGER TRANSPORT IN DOLJ COUNTY

Rezumat:
The paper presents analysis of current situation regarding public passenger transportation program for Dolj County. Measurements were carried out in order to de-termine the number of passengers laden on transport, passenger flow distribution, cov-erage with transportation routes based on passenger requests. It has also calculated the average distance and average travel time for each route of the current county transport program

CuvinteCheie:
public passenger transport, average travel distance, average travel time


Titlu:
OPTIMIZATION SOLUTIONS FOR THE TRANSPORT OF PERSONS IN DOLJ COUNTY

Rezumat:
This paper presents an optimal solution for the transport of people in Dolj County through scheduled for the period 2011-2015. Are presented graphically Map County, the localities involved, which were represented by transmission lines proposed inter-county routes, each route by allocating a number entered for each station along the route, marking the departure and arrival stations related pathways


Titlu:
DEVELOPED SOLUTIONS FOR OPTIMISING THE RISING OF THE ADMISION VALVE IN AUTOMOBILE ENGINES

Rezumat:
For reducing the effect of “pumping loss” there have been studied and developed some solutions which ensure the variation of lifting the valve in connection with the revolution speed. This was done first with mechanical and mechanical-hydraulic systems and later it was developed variation lifting sys-tems of electronically controlled throttle valve. The benefits are delivering of more power with lower emissions, the increase of efficiency and timeliness of response of the engine


Titlu:
THE IMPORTANCE OF PERFOMANCE EVALUATION SYSTEM FOR BLUE COLLAR WORKERS

Rezumat:
In order to facilitate the achievement of production company mission and vision, the human resources management develop the culture of performance and settles and deploys strategies, objectives, policies and processes, both for white and blue collar workers.  In the interest of promoting uniformity and equity in blue collar performance appraisals, today’s production companies develop organizational values and systems. This process is especially designed to help the production organisation locate its position on a scale of business excellence

CuvinteCheie:
human resources, performance appraisal methods, performance evaluation systems, white collar, blue collar worker


Titlu:
VARIOUS ASPECTS  REGARDING THE DESIGN OF A GEAR SHIFT SENSOR FOR ROAD VEHICLES

Rezumat:
During time there has been a major concern regarding the reduction of fuel consumption, concern which has led the authors of this paper to the idea of designing of an electronic sensor dedicated to the determination of the ap-propriate gear. This sensor is regarded as part of a complex informational sys-tem which would allow the engine to run all the time on the optimum running curves. The sensor is designed based on electronic components and its cali-brated for a certain type of gearbox

CuvinteCheie:
fuel consumption, gearshift sensor, electronic components


Titlu:
ASSESSMENT OF PLASTIC DEFORMATION IN THE CUTTING ZONE AND CORRELATION WITH ROUGHNESS, AT INNER CYLINDRICAL TURNING WITH SMALL CUTTING

Rezumat:
This paper describes a study concerning the results of an experiment about inner cylindrical turning of a steel OL37, in small cutting feeds domain. The values of geometrical roughness are calculated and compared with the values of effective roughness. Thickening and widening factors of chip and their variation with the feed, in small cutting feeds domain

CuvinteCheie:
inner cylindrical turning, small cutting feeds, chip deformation, roughness at turning


Titlu:
INFLUENCE OF TECHNOLOGICAL PARAMETERS ON THE FINAL PROPERTIES OF COMPOSITE BASED ON TUNGSTEN POWDER AFTER HYDROGEN SINTERING

Rezumat:
It is presented a study about the effects of the technological parameters on the final resulted properties of composites based on tungsten powder. The use of alloys containing an amount of tungsten (over 65%) has increased during last years because of their unique combination of properties. These properties are a result of the chemical composition of the alloy on one hand, and a specific microstructure obtained during liquid phase sintering on the other hand. This paper presents the experimental results of the elaboration of a tungsten-copper composite used for the electrical devices in electrical industry. The influence of some technological parameters and of different types of powders used as raw materials on the quality of these pseudoalloys is underlined. The mixing and cold compaction processes and, the sintered diffusion or mechanical processing of this mixture are also studied in this paper

CuvinteCheie:
tungsten powder, composite, hydrogen sintering, density, hardness, microstructure


Titlu:
CHIPS FORMS AND THEIR IMPORTANCE ON PLAIN TURNING WITH SMALL CUTTING FEEDS

Rezumat:
Forms and chips size are very important, especially in the automatic processing, because they can disrupt the process of cutting by breaking and blocking tools. This paper presents an experiment on the shapes and dimensions of chip obtained by the inner cylinder turning with small cutting feeds. Chips resulted by small cutting feeds are small; the chips are broken because they are small sections, so they break easily. With increasing the cutting feed in the small cutting feeds domain, there is observed an increasing of the maximum diameter of the chip because of plastic deformations. It establishes a polynomial for cal-culating the maximum diameter of the chips

CuvinteCheie:
plain turning, chips shape, importance of chips size


Titlu:
THE SYNTHESIS OF A MECHANISM WITH CAM WHICH IS FUNCTION GENERATOR

Rezumat:
We leave from the issue of associated positions of the mechanisms with bars, and from generating some functions by mechanisms with bars. It is presented an original mechanism, with cam and rack-toothed wheel gearing, which generates the required functions. It synthesizes two mechanisms for a certain function and for a linear function

CuvinteCheie:
generating functions mechanism, cams, synthesis


Titlu:
THE SYNTHESIS OF A PLANETARY MECHANISMS COMPLETED WITH A DYAD, WHICH ENSURES THE 
TEMPORARY STOP OF THE FINAL HEADED ELEMENT

Rezumat:
It is being studied the synthesis of a planetary mechanism, completed with a dyad. This mechanism provides the stationing of the final leading element on a cycle, in which the leading element moves are useful, for example, at pressings. Geometric conditions are given. The usable hypocycloid types are established. It shows how the accuracy decreases as the geometric restriction appears at the determination of the rods length

CuvinteCheie:
planetary mechanism, cycloid curves, synthesis mechanism


Titlu:
MANUFACTURING TECHNOLOGIES USED IN CONSTRUCTIONS IN ANCIENT TIMES

Rezumat:
This paper presents the technology of execution used by ancient builders to raise the grandiose monuments which have survived over the ages.We try to show some hypothetical analysis methods for pyramids constructions


Titlu:
COMPARATIVE ANALYZE OF BRAKING DISTANCES ON SNOW COVERED ROADS FOR TWO VEHICLES: DACIA LOGAN AND SEAT LEON

Rezumat:
The present work realizes a comparative study of stopping distances for two different passenger cars, Dacia Logan and Seat Leon on snow covered road. There were choosen different vehicles, but close enough as a class level, in order to point out the behaviour during braking till stop in different states of a snow covered road driving condition. The tyres have a significant influence upon the vehicle behaviour during braking process with ABS and also without it. The ABS has a positive influence upon vehicle’s driveability during brake.

CuvinteCheie:
vehicle, active safety, braking, ABS, stopping distance


Titlu:
EXTERNAL ENERGY CONDITIONING AND THE INFLUENCES ON BIOFUELS PHYSICALLY PARAMETERS

Rezumat:
Even though currently the future use of biofuels in road transport (in terms of fossil fuel crisis) is much debated by specialists, biofuels can be successfully used on the farm by the ease with which they may be obtained and especially due to the effect polluter much lower than the fossil fuels. 
Reducing pollution from agriculture technological operations is a necessary condition to develop in the future agricultural development on a sustainable basis.
To truly become a competitive fuel on market, compared with fossil fuels, biofuels must optimize parameters related to characteristics of density, viscosity, freezing point and especially the specific calorific value.
This paper presents findings related to the influence of external energy intake in the form of ultrasound, electromagnetic field and ionization on the physical parameters of biofuels (biodiesel and bioethanol), the main parameters considered are speed of sound, density, isotropic adiabatic coefficient, pH index.

CuvinteCheie:
biofuels, physical parameters, external energy, conditioning, IC engine


Titlu:
THE PARAMETRIC VIBRATIONS OF THE DRIVING HYDRAULIC MOTORS FOR HEAVY MOTOR VEHICLES

Rezumat:
One elaborates a mathematical model in the angular velocity of a driving hydraulic motor and the way of analysis of the parametric vibrations induced in the totality of the motor vehicle vibrations

CuvinteCheie:
rotative hydraulic motor, mathematical model, vibration


Titlu:
GPS SOLUTIONS FOR THE GPS NETWORK AJUSTEMENT COORDINATE SYSTEMS

Rezumat:
Processes sets of redundant observations according to mathematically well-defined rules. Finds the statistically best possible solution. Allows quality control of the observations. Provides quality indicators for determined unknowns and for quantities derived from these unknowns. Provide an estimate for the reliability of the network

CuvinteCheie:
LGO Network Adjustment, Coordinate systems


Titlu:
PREVENT TEMPERATURE SWINGS IN SUNROOMS WITH FIBERGLASS HEAT STORAGE TUBES FOR SOLARIUM COOLING AND SOLAR HEAT STORAGE

Rezumat:
This paper present the benefits of the passive solar heat storage tubes made from fiberglass material. This solution solves the heating of solarium and individual rooms being a natural sour of green thermal energy which have also a beautiful design. There are presented the finite element analysis of the cylin-drical fiberglass tubes in specific thermal conditions

CuvinteCheie:
heat storage tubes, fiberglass, solar energy, thermal finite element analysis,


Rezumat:
In the present paper the automotive suspension is simulated in many situations.
SimulationX® is the leading-edge technology in physical system simulation. The tool can be used as a system simulator by engineers in all industries. The general concept is to provide one unique platform for modeling and simulation of dynamic system behavior.
Software users benefit from ITI's exclusive engineering know-how for industrial applications utilizing SimulationX®. First-hand modeling expertise and customized solutions can be achieved immediately with SimulationX®. ITI with SimulationX® is the ideal partner from modeling to computation and simulation right through to the successful CAE integration


Titlu:
BIODIESEL USAGE -THEORETICAL RESEARCHES ON AN ENGINE EQUIPPED WITH COMMONRAIL INJECTION SYSTEM

Rezumat:
The objective of the project is to investigate the burning characteristics of vegetable oil droplets from experiments conducted under high pressure and high temperature conditions. With such investigations, combustion performances of vegetable oils as bio fuels for Diesel engines could be improved


Titlu:
CONTRIBUTIONS TO THE VIBRATION ANALYSIS OF THIN CURVE BOARDS FROM THE CAR BODY STRUCTURE

Rezumat:
Considering the simplified Vaslov theory, there is created a mathematical model for the transversal vibrations of a curve thin board, in spatial rototranslation. For the analysis of this model, it is adopted the integral transformation.


Titlu:
MODELING AND ANALYSIS ON ADJUSTABLE VANE

Rezumat:
This paper presents the tools used to develop a 3D CAD model for the adjustable vane, subassembly of the wicket gate. Due to the work heavy condi-tions of the wicket gate is important to model and analyse the adjustable vane from a hydro electric generator. First, a solid model is developed and then a fi-nite element analysis for the adjustable vane is performed

CuvinteCheie:
adjustable vane, 3D CAD model, acceleration


Titlu:
THE THREE-DIMENSIONAL PRINTING TECHNOLOGY USED FOR BIOMECHANICAL PROTOTYPES

Rezumat:
The 3DP (three-dimensional printing) is a rapid prototyping technology, used to create complex three-dimensional parts directly from a computer model of the part, with no need for tooling. This paper investigates the use of a cheaper, low-end RP technology known as 3-D printing. Using the Rapid Prototyping 3D Zcorp 310 Printer system, we manufactured the prototypes for modular plates, human bones and the artificial necessary for ulterior ‘in vitro’ simulations, experimental tests, experimental measurements Using Rapid Prototyping as a fabrication method one can finally obtain functional assemblies which can be used afterward in various experiments (for example, kinematical or dynamic studies) just as in the case of conventional metal based assemblies; Rapid Prototyping method exceeds the conventional manufacturing methods in terms of accuracy and fabrication time


Titlu:
CHEMICAL COMPOSITION INFLUENCE ON THE MECHANICAL AND PHYSICAL CHARACTERISTICS OF THE PM IRON BASED ALLOYS

Rezumat:
New antifriction materials based on iron powder, with several addition elements were developed using PM technology. The samples were obtained by uniaxially cold compaction using pressure forces of 500 MPa and sintered in dry hydrogen atmosphere at three different temperatures. In this study the effect of the chemical composition on Vickers hardness and microhardness as a function of process parameters was investigated.  Vickers hardness was evaluated at an indentation load of 50 N and Vickers microhardness was evaluated at an inden-tation load of 0.1 N. Also, in this report the effect of the process parameters on the dimensional changes of the sintered iron base antifriction compacts was sys-tematically examined

CuvinteCheie:
powder metallurgy, microhardness, dimensional changes, chemical composition, PM iron base alloys


Titlu:
AUTOMATIC GEARBOX OPTIMIZING PROCESS DEVELOPED IN AVLCRUISE

Rezumat:
The optimization of the automatic gearbox from the software point of view is considered to be as important as the optimization of the functioning process itself. The software has to take into account all the necessary and unnecessary information that is provided by the ECU for the TCU. If the software of the TCU is not updated to be able to make decisions that are correct for the driver, for the safety of the vehicle and for the transmission itself the entire power train unit has to suffer by poor data management. If the information provided by the ABS and by the ESP, information that are in strict connection with the safety of the vehicle are not correctly treated by the TCU there is a possibility of miss-function of the entire power train unit.
Optimizing the data management is vital in the virtual environment of the TCU control software


Titlu:
BITUMINOUS ROAD METALS BUILT OF HOT-WORKED CYLINDERED ASPHALT MIXTURES. MECHANICAL-PHYSICAL CHARACTERISTICS, IDENTIFIED IN THE LABORATORY

Rezumat:
In lucrare sun analizati factorii  pricipali care determina aderenta  dintre beton si armaturile din otel beton, totodata fiind analizate principalele caracteristici fizico- mecanice ale otelului beton, caracteristici determinate in conditii de laborator.Astfel sunt analizate valorile medii obtinute pe serii de epruvetede otel beton OB37 si PC52 de diverse diametre, pentru forta la rupere si forta la curgere, fiind intocmita o reprezentare  grafica a comportarii acestor materiale  cu ajutorul careia se poate concluziona privnd modalitatile de utilizare ale acestor materiale in procesele de executie

CuvinteCheie:
Constructii,otel beton, beton armat, caracteristici fizico-mecanice, epruvete


Titlu:
CFD STUDY OF SECTION CHARACTERISTICS OF  RACE CAR WINGS

Rezumat:
In an effort to provide some information for teams competing in the  league Formula 3 racecar class, this study was conducted using the Star-CD CFD code to perform a turbulent simulation (using a k–" model) of the airflow on the front and rear wings of a Formula 3 car with different angles of attack and the effect of the ground on the front wing. Results are presented graphically, showing pressure and velocity distributions and lift (Cl ) and drag coefficients (Cd ) for the different cases. It was shown that the ground effect has a marked effect on the Cl and that the angle of attack has a significant effect on the lift and drag coefficients, and it was shown that an angle of 12  below the horizontal seems to indicate stalling conditions. It is suggested that this information, along with experimental validation, can be valuable for improving the optimum handling of these Formula F3 race cars


Titlu:
NUMERICAL SIMULATIONS OF THE VIRTUAL MODEL OF ULNA BONE

Rezumat:
In this paper we are present the characteristics of the ulna bone and the AO classification of the ulna/radius diaphyseal fractures.  Using SolidWorks – an Computer Aided Design software package, we have obtained the  virtual models,  stress and displacement diagrams of the ulna  bone

CuvinteCheie:
virtual model, ulna bone, numerical simulation


Titlu:
DESIGNING AND VERIFYING IN R.D.M. OF A TEST BENCH FOR STUDYING THE S.I.E. CHARACTERISTICS WITH HYDRAULIC DYNAMOMETER

Rezumat:
By this means the paper presents the requirements, magnitudes, and parameters which are considered when engine tests are made on the test benches. Also it gives the symbols and measuring units of determined magnitudes in the testing process. Everybody should know the fact that regulations are absolutely necessary when somebody designs and realizes a test bench for internal combustion engines.
The test bench and its components will be designed and conceived. The test bench for Otto engine is realized on a suitable structure existent in the engines’ laboratory from Faculty of Mechanics. The higher angular speed of the engine compared to the dynamometer’s speed forced us toward the design and realization of a gear box. The bench structure and some other shaft type elements have been verified using specialized software applications. R.D.M. has been used in order to determine the tensions which act upon the bench structure.
This paper significantly contributes to the self-settlement process of the Engine Laboratory from our University, offering the necessary technical documentation for the engine’s test bench and actually realizing the solution for connecting the engine with the dynamometer

CuvinteCheie:
Vehicle engines, Otto engine, Engine’s Bench, engine’s characteristics


Titlu:
EVALUATION METHODS FOR THE BIOMECHANICAL QUALITY OF RESTRAIN SYSTEMS DURING FRONTAL IMPACT

Rezumat:
From a biomechanical point of view, test criteria in current safety standards for passenger protection do not insure a sufficient over-all protection of quality.
First, the deficiencies of data and criteria, responsible for biomechanical prob-lems, are being analysed. Secondly, additional criteria are being defined, which we think are significant for a better over-all evaluation of restraint de-vices considering biomechanical facts. As a result of a dummy-crash series, an analysis is presented, demonstrating correlations between the new defined and former criteria.
The final aim is to develop a complete system of criteria. By the use of simple evalution methods it would guarantee clear results concerning biomechanical properties of passenger protection systems. With this technique one can have correct biomechanical evaluations of restraint systems, gained from dynamic tests even with anthropometric dummies

LinkDocument:
ICOME 2010 CRAIOVA CIUNEL, TICA, CAMPIAN


Titlu:
ABOUT MOVEMENT EQUATIONS OF THE ACTIVE ELEMENTS IN A ULTRASONIC SYSTEM USE IN MODERN FABRICATION

Rezumat:
Ultrasonic systems based on “Multi-frequency, Multimode, Modulate” technology may be used as structural actuators capable of delivering high power sonic and ultrasonic energy to a large or small loads. MMM uses pro-prietary techniques to initiate ringing and relaxing multimode (wideband high and low frequency) mechanical oscillations in a mechanical body to produce pulse-repetitive, frequency, phase and amplitude modulated bulk-wave-excitation on that body. In this paper will analyze the process of ultrasonic splintering of materials, using forced vibration direction as the main compo-nent, taking into account the effects of this way to activation tool, on some spe-cific parameters of the chips, compared with the conventional process of splin-tering

CuvinteCheie:
ultrasonic, sonic, vibration, transducer, acoustic, splintering, overlapping har-monic


Titlu:
KINEMATIC MODELING AND SIMULATION OF QUADRUPED BIOMECHANISM

Rezumat:
In this paper we present the kinematic model of a biomechanism which represent the legs of a four legged mammal. The anterior legs and posterior are realized as plane mechanisms, with articulated bars. Each anterior leg has a complex structure with three closed contours, mean while each posterior leg has only two closed contours. Each mechanism is actuated by an electric motor. The geometric and kinematic modeling of the anterior leg mechanism is achieved by means of some vectorial and scalar equations. Also, the kinematic simulation is achieved by means of ADAMS software, considering as basis, the upper platform of each mechanism


Titlu:
RESERCHES ON COLD STARTING OF BIODIESEL DIESEL ENGINES

Rezumat:
In this paper we analyzed the cod starting of diesel engines when we fueled the engine with biodiesel blends. The test was carried out in the laboratory of Thermodynamics from University of Craiova Faculty of Mechanics. We use a B50 blend of diesel Euro L Diesel and biodiesel of sunflower oil. As engine we use a mono cylindrical diesel engine RY 50.  The test was performed without any load on the engine and we measured the following parameters: CO, CO2, HC, and O2. We notice that the blend tested in the engine presents the same parameters as conventional petrodiesel fuel


Titlu:
NEW APPROACHES IN TOLERANCE ANALYSIS AND ALLOCATION

Rezumat:
The paper presents a study regarding new approaches in tolerance analysis and allocation, based on Finite Element Method. It is shown the requirement and  importance of the FEM to predict the tolerancing specified on assembly relative to the tolerancing specified on the single part by taking both deformation and assembly process into account. So, CAD modelling and FEM  reveales  to be a  powerful instrument to improve the design, especially of  flexible assemblies which can be found in many mechanical application such as aerospace, automotive, electronic and biomechanics. There are presented mathematical models and practical cases

CuvinteCheie:
tolerance analysis, finite element metod, flexible assemblies


Titlu:
ADDITION ELEMENTS INFLUENCE ON THE MECHANICAL PROPERTIES OF THE PM COPPER BASED ALLOYS

Rezumat:
This paper has the purpose to present the mechanical behavior of some Cu-based antifriction alloys with Sn, Zn and Pb as alloying. These alloys contain 1% graphite and the lead content ranged between 4 – 8%. The samples were tested to radial crushing, shock strength and wear resistance

CuvinteCheie:
powder metallurgy, radial crushing, shock strength, wear resistance


Titlu:
MATHEMATICAL MODEL FOR ANALYSIS OF SURFACE GENERATION AT GRINDING

Rezumat:
The paper presents a mathematical model for surfaces obtained by grinding. There are considered two abrasive grains for which is studied the surface generated during processing. There are taken into account the grinding speed, advance speed but also the average distance between grains measured on the circumference of the abrasive tool. By intersecting these surfaces with the workpiece material it is obtained the shape of the surface after grinding


Titlu:
DESIGNING MECHANICAL ARTICULATED HANDS – A DIFFICULT PURSUIT TO COPY THE HUMAN HAND

Rezumat:
In this paper we present the major difficulties one can face in the attempt of designing an artificial hand capable to reproduce partly or totally the spectacular capabilities of the human hand. Aspects like mechanical model, actuation, sensor system, control, will be the main topics of this paper. In addition, in this paper it is showcased an experimental study which describes a new approach regarding the measurement of the forces appeared at the human hand-object interface

CuvinteCheie:
artificial, hand, robotic, actuation, sensors


Titlu:
DEVELOPMENT OF A DRIVING CYCLE FOR BRASOV CITY

Rezumat:
A driving cycle is a standardised driving pattern, described by means of a velocity-time table. The typical driving profile comprises accelerations, de-celerations and stops and it is simulated on a laboratory chassis dynamometer. The European Driving Cycle is the common reference in Europe, but this cycle could not describe satisfactorily the driving characteristics in Brasov. The objective of this paper is to propose a realistic driving cycle for Brasov, based on real data collected using the instrumented vehicle method. The onboard data acquisition equipment was GPS devices and the collected data covers typical roads of the city. It was developed a dedicated software tool for analysing data and for identification of the driving pattern. The process has three steps: first, each track is represented as a collection of point and line enti-ties, with custom metadata attached; second, a speed/time diagram is generated for each recorded track; finally, a representative diagram is created after an automated analysis of all the existing diagrams

CuvinteCheie:
driving cycles, NEDC, vehicle dynamics, road traffic, vehicle speed


Titlu:
OPTIMIZATION STUDY OF A CAR SUSPENSION–STEERING LINKAGE

Rezumat:
The study presents the main steeps and some results of a design, analyze and optimization process of a complex articulated mechanism required for a car suspension and steering. The authors used a top-down approach, starting from the requirements of the assembly and the close connections between the vehicle suspension and steering. Then the computer model was successively refined and new components were added as the design solutions became clearer. More steps were done, starting with a simplified analysis aiming geometrical optimization, continuing with a multibody study of the mechanism, part and assembly manufacturability-oriented CAD-modeling, a finite element analysis of some important parts and finishing with corrections and tunings of the CAD models

CuvinteCheie:
MacPherson suspension linkage, rack-and-pinion steering, multibody analysis, finite element analysis, optimization


Titlu:
DIESEL FUEL, LPG AND BIODIESEL MIXTURES COMBUSTION IN D.I. DIESEL ENGINES

Rezumat:
In the first part of the paper, is presented a mixture formation and combustion processes analyze from D.I. Diesel engines. After this, are described the main proprieties that the fuel and air-fuel mixture must have to obtain a good combustion.
In order to study the combustion of these fuels mixtures, the authors made researches on D.I. Diesel engines. The characteristics of engines, tests conditions, equipments and techniques that were used have a detailed presentation.
After processing experimental data were formulated some interesting conclusions regarding the influence of the fuel characteristics on:
- Mixture quality;
- Self-ignition delay;
- Heat release rate;
The conclusions are interesting, being accentuated the energetically and ecological limits of these types of fuels

CuvinteCheie:
combustion, diesel, biofuels, LPG, fuel mixtures


Titlu:
SOME ASPECTS RELATIVE ON VEHICLE-PEDESTRIAN IMPACTS

Rezumat:
The study of injuries suffered by persons involved in road traffic accidents represents a continuous subject under research, due to the intrinsic nature of the phenomenon and as a continuous effort towards the improvements on the road safety, particularly the passive safety. In order to avoid the accidents involving pedestrians, the research concerns, widely presented within the technical literature and special journals and magazines, were focused on three directions, namely: Improvements on the protection systems and installations; Separation between the two traffic routes, auto and pedestrian; Diminishing of the collision consequences by using protection systems. The use of the protec-tion systems may be extremely difficult at first sight. During the last years there was made a lot of progress in this direction, especially as concerns the vehicle external surfaces design. The first step to take when dealing with this problem is the detailed analysis of road accidents involving pedestrians. In the paper we comparing the values related to the kinematics of body segments retrieved ex-perimentally with the values related to the multibody theoretical model devel-oped for the pedestrian. The criteria used in order to estimate the traumas of the human body are head and thorax decelerations as well as impact speeds of these human body segments with motor vehicle’s parts. The experimental tests considered the specificity of the fleet vehicles in Romania, choosing the vehicle with the highest share of the overall vehicle fleet and represent a natural conse-quence of the research interests of the authors

CuvinteCheie:
road traffic accidents, pedestrian, injuries, traffic accidents reconstruction


# Participanti

Institutia:
University of Pitesti Faculty of Mechanics


Institutia:
Transilvania University Brasov Department of Autom


Institutia:
University of Craiova Faculty of Management


Institutia:
S.C. Cambric Consulting SRL Brasov punct de lucru


Institutia:
University of Craiova Department of Mechatronics


Institutia:
University of Pitesti Automotive Department


Institutia:
University of Pitesti Electrical Engineering


Institutia:
Universitatea ”Aurel Vlaicu” Arad Facultatea de in


Institutia:
University of Pitesti Department of Automotive


Institutia:
Ph. D - Student Transilvania University of Brasov


Institutia:
Naval Academy “Mircea the Elder” Constanta


Institutia:
University Of Pitesti Automotive Department


Institutia:
University ‘Spiru Haret’ Bucuresti E-mail


Institutia:
Military Technical Academy Military Vehicles and L


Institutia:
Military Technical Academy 81-83 George Cosbuc Blv


Institutia:
University of Pitesti Computers & Electronic


Institutia:
School of Naval Petty Officers „Admiral Ion Mu


Institutia:
Mechanical Engineering Faculty „Ovidius” Universit


Institutia:
Grupul Scolar “Gheorghe Bibescu” Craiova


Institutia:
Automotive Engineering Center Research University


Institutia:
Head of Military Vehicles and Logistics Department


Institutia:
University of Agricultural Sciences and Veteri


Institutia:
Internal Combustion Engines University Politehnica


Institutia:
Mechanical Engineering Faculty „Mircea cel Batran”


Institutia:
Metallurgical High School Department of Mechanics


Institutia:
Thermodynamics and Fluid Mechanics Department Tran


Institutia:
Universitatea Tehnica "Gheorghe Asachi" Iasi


Institutia:
FEMTO-ST, University of Franche-Comté, France


Institutia:
Col.Tehnic Energetic Dragomir  Hurmuzescu Deva


Institutia:
University of Chemical Technology & Metallurgy


Institutia:
Grup şcolar Transporturi Auto “Traian Vuia-Tg. Jiu


