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FINITE ELEMENT analysis OF thE INFLUENCE OF thE MATERIAL CONSTITUTIVE LAW FORMULATION ON thE CHIP FORMATION PROCESS DURING A HIGH SPEED METAL CUTTING

FINITE ELEMENT ANALYSIS OF THE INFLUENCE OF THE MATERIAL CON...

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11th asme biennial conference on engineering systems design and analysis, (ESDA 2012)

作者： Gavrus, Adinel Caestecker, Pascal Ragneau, Eric UEB INSA Rennes Rennes France

ISBN: (纸本)9780791844847

During the last decades, the importance of machining in manufacturing industry has required rigorous scientific studies concerning the chip formation process in order to determine optimal speeds, feeds or other technological parameters. For all types of machining including turning, milling, grinding, honing or lapping, the phenomenon of chip formation is similar in terms of the local interaction between the tool and the work piece. Because of the intensive use of CNC machine tools producing parts at ever-faster rates, it has become important to provide analysis of high speed cutting where complex loading conditions occur during the fabrication process: high gradients of the thermo-mechanical variables, strong nonlinearities of the thermo-mechanical coupling, large plastic strains, extremely high strain rates compared to that of other forming processes, important influence of the contact friction and of the microstructure evolution. Today many scientific researches are focalized on finite element analyses of the chip formation and of its morphology evolution during a high speed metals cutting process. To improve the quality of the numerical predictions, a better description of the local shear band formation is needed, using adequate rheological models. On this point of view this paper deals with the influence of the rheological behavior formulation on the morphology and geometry of the chip formation during a finite element simulation of a high speed metal cutting process. Numerical simulations of a high speed orthogonal cutting of special steels are employed to analysis the sensitivity of the numerical results describing, the local cutting area with respect to different rheological laws: Norton-Hoff or Cowper-Symonds model, Johnson-Cook one or Zerilli-Armstrong formulation. To obtain a better description of the local material loadings and to take into account the important gradient of the strain rate, plastic strain and temperature values, a more adequate constituti

关键词： Plastic deformation

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design OF A NEW MECHANICAL VARIABLE VALVE ACTUATION SYSTEM FOR MOTORCYCLE ENGINES

DESIGN OF A NEW MECHANICAL VARIABLE VALVE ACTUATION SYSTEM F...

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11th asme biennial conference on engineering systems design and analysis, (ESDA 2012)

作者： Abagnale, Carmelina Migliaccio, Mariano Pennacchia, Ottavio Univ Naples Federico II Dept Mech & Energet Naples Italy

ISBN: (纸本)9780791844861

this paper deals with design and manufacturing of a mechanical variable valve actuation (VVA) system, developed as part of a MUR financed research project concerning the realization of a high performance motorcycle engine, through a partnership of Moto Morini (Bologna), Dell'Orto (Milano), Istituto Motori - CNR (Napoli) and DiME (Department of Mechanical engineering and Energetics) - University of Napoli Federico II. After a synthetic description of the main variable valve actuation methods currently employed, the paper presents the results of our mechanical VVA system, consisting of three main elements: cam, main rocker arm with fixed fulcrum and secondary rocker arm with mobile fulcrum. this VVA system (system 1) enables valve lift variation by a simple translation of one of the three elements (the intermediate one). the study has been conducted implementing a numerical procedure specifically designed to determine cam profile and kinematic and dynamic characteristics of the whole system, starting from the following input data: rocker arm geometry, relative positions and inertial data of elements, spring stiffness and preloading, camshaft speed and valve lift law. the model has been validated against the conventional timing system using kinematic simulations. Results of the numerical procedure verify the validity of the VVA system, capable of a valve lift variation, with a limited acceleration. Starting from the numerical results, we have developed a new mechanical variable valve actuation system (system 2): it consists of the same three elements used previously, but they are connected in a different way. the newer system enables more general lift profile distributions with a similar geometric complexity. the activity has been extended to research for a new solution (always a mechanical system), capable to allow inlet valves complete closing and timing and duration variation (system 3). this paper reports results reachable with the simplest system 1, that gives bet

关键词： VVA Variable Valve Actuation Engine Valves

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OPTIMIZED design FOR thE KNEE STRUCTURE OF A HUMANOID ROBOT

OPTIMIZED DESIGN FOR THE KNEE STRUCTURE OF A HUMANOID ROBOT

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11th asme biennial conference on engineering systems design and analysis, (ESDA 2012)

作者： Howard, thomas Berviller, Laurent Zattarin, Patrick Abbat, Gabriel Arts & Metiers ParisTech Ctr Metz F-57078 Metz 03 France

ISBN: (纸本)9780791844854

the objective of this work is to design and to make a part of a humanoid robot, named HYDROID. the keynote is a development of a self-sufficient robot by minimizing energy inputs required for its activity. Currently humanoid robots have a power/weight ratio lower than human, as a consequence a limited autonomy. In this work we propose an innovative knee structure in order to reduce friction, and as a result, increase energy efficiency. In classic knee architectures, the rolling elements are balls in bearings with relatively small curvature radii. Here, the idea is to increase this curvature radius to minimize rolling friction. this new joint is realized by rolling between two pieces (femur and tibia) linked by ligaments, and thus get an architecture similar to that of a human knee. As such, the contact is made by rolling movement without sliding between two cylindrical surfaces with circular section, and for which we need find an innovative actuation mechanism. To take advantage of energy savings achieved, we must optimize the mass distribution so as to achieve the smallest global inertia of the mechanical system. In this work we propose various technological solutions for actuation mechanisms. A comparative study is performed between the different technological choices for actuator (cylinder or rotary actuator) and for transmission (connecting crank arm, belt, gearing, etc.). Of course, this new structure must be in accordance with specifications for the knee about size and weight, as well as amplitude and speed rotation of joint. In this work, our choice is to use electric actuators. these different solutions- are evaluated according several criteria such as inertial characteristic (mass and inertia matrix), overall size, energy efficiency and the complexity of the system (number of used pieces). Initially, solutions with pulley and belt or rotary actuators and cables seem to have best performance those other systems with connecting crank arm or gearing. Results s

关键词： Energy efficiency

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STUDY OF thERMO-PHYSICAL PROPERTIES OF SELECTED NICKEL-BASED SUPERALLOYS WIth USE OF DTA MEthOD

STUDY OF THERMO-PHYSICAL PROPERTIES OF SELECTED NICKEL-BASED...

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11th asme biennial conference on engineering systems design and analysis, (ESDA 2012)

作者： Dobrovska, Jana Zla, Simona Kavicka, Frantisek Smetana, Bedrich Vodarek, Vlastimil Tech Univ Ostrava Fac Met & Mat Engn Ostrava Czech Republic

ISBN: (纸本)9780791844861

the presented paper deals with study of thermo-physical properties of cast complex alloyed nickel based superalloys IN713LC;IN738LC and IN792-5A. In this work the technique of Differential thermal analysis was selected for acquisition and comparison of the phase transformation temperatures. the samples taken from superalloys in as received state were analysed at heating and cooling rates of 1, 5, 10, and 20 K/min using the experimental system Setaram SETSYS 18TM. Moreover, the transformation temperatures for zero heating/cooling rate were calculated. Based on a comparison of these temperatures it is possible to make the following conclusions: (i) the alloy IN792-5A has the highest temperature of solubility of the strengthening phase 7' (1235 degrees C);(ii) the highest liquidus temperature (heating) obtained by extrapolation was found in the alloy IN713LC (1349 degrees C), the lowest solidus temperature (heating) was found for the alloy IN738LC (1212 degrees C);(iii) At cooling an undercooling occurred in all alloys. In general it may be stated that the biggest under-cooling (TS, 47 degrees C) was recorded in the alloy IN792 5A;(iv) the width of. the interval of the heat treatment window was the biggest in alloy IN713LC (44 degrees C);(v) the alloy IN738LC is characterised by the widest interval of melting (124 degrees C) and solidification (134 degrees C), while the alloy IN792 5A has the narrowest interval of melting (82 degrees C) and at the same time almost the same interval of solidification as the alloy IN738LC (129 degrees C);(vi) the obtained phase transformation temperatures were compared with the values of phase transformations temperatures calculated on the basis of established relationships. In order to obtain more precise description of the behaviour of Ni-based superalloys, during controlled heating/cooling of the initial material (as received state) during DTA analyses, all the samples of superalloys were subjected to a phase analysis using scanning e

关键词： Transformation Temperatures Cooling Rate Differential thermal analysis IN 713LC IN 738LC IN 792-5A

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analysis OF A RECIPROCATE ENGINE-BASED COGENERATION PLANT WIth HIGH TEMPERATURE HEAT RECOVERY FOR INDUSTRIAL USES

ANALYSIS OF A RECIPROCATE ENGINE-BASED COGENERATION PLANT WI...

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11th asme biennial conference on engineering systems design and analysis, (ESDA 2012)

作者： Cardona, Fabio Panno, Domenico Piacentino, Antonio Univ Palermo I-90128 Palermo Italy

ISBN: (纸本)9780791844854

In consequence of the increasing awareness on the future scarcity of fossil energy sources and the global warming impact of energy conversion processes, the European Union has been planning several actions to enhance the efficiency of energy use and reduce the environmental impact. the declared goals of EU actions are synthetized in the 20-20-20 formula, consisting of an expected 20% increase of energy efficiency, a 20% contribution to the total energy supply by renewable sources and a 20% abatement of pollutant emissions. Application's of cogeneration in process industry can significantly contribute to achieve these targets. In this paper a reciprocate engine-based Combined Heat and Power (CHP) plant is presented, serving a pasta factory located in Sicily and installed by an Energy Service COmpany (ESCO) within the context of a national implementation scheme of Energy Saving Certificates (or "white certificates"). the CUP plant, with a 650 kWe capacity, currently covers a relevant fraction of the electric and high-temperature heat loads during peak hours, while it is switched off during off-peak hours because of the much lower electricity price. Heat content of flue gases is recovered by two cascaded gas-diathermic oil and diathermic oil-water heat exchangers;the superheated water obtained is then supplied to the pasta dryers. the first part of the paper provides a detailed plant description and an energetic analysis of historical performance data collected along the last two years of operation. Both the critical analysis of the lay-out and the evaluation of energy saving indicators reveal the current scheme to represent a sub-optimal solution for the particular application. In the second part of the paper a modified solution is simulated, consisting of the same CHP unit equipped with additional heat exchangers for heat recovery from the cooling water jacket circuit. the marginal energetic and economic benefits compared to the current plant setup are calculated;the

关键词： Energy saving industrial applications cogeneration heat recovery reciprocate engine gas turbine

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Training with augmented reality on engineering degrees

Training with augmented reality on engineering degrees

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asme 2012 11th biennial conference on engineering systems design and analysis, ESDA 2012

作者： González, Cristina Roca Domínguez, Melchor García Martín-Gutierrez, Jorge Contero, Manuel Alcañiz, Mariano Universidad de Las Palmas de Gran Canaria Escuela de Ingenierías Industriales y Civiles Departamento de Cartografía y Expresión Gráfica en la Ingeniería Las Palmas de Gran Canaria Spain Departamento Expresión Gráfica en Arquitectura e Ingeniería Escuela de Ingeniería Civil e Industrial Universidad de La Laguna La Laguna Tenerife Spain Instituto en Bioingeniería y Tecnología Orientada al Ser Humano Universidad Politécnica de Valencia Valencia Spain

ISBN: (纸本)9780791844847

this paper reports about the research based on the comparison of tests about the spatial skill of engineering students from two Spanish universities before and after the performance of specific training for improving several abilities based on tasks with 3D objects visualized through augmented reality technology. the training was completed at home with 66 students as participants, considering a control group composed of 25 students from both universities. the AR system technical aspects are also described as well as the application developed. the study's results show that students from both universities improve their spatial ability and there is no significant statistical significance between students from both universities, neither before nor after training so we may conclude that training's effect on both universities is analogue. Copyright © 2012 by asme.

关键词： Augmented reality

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TRANSFER MATRIX COMPUTATION FOR WAVE ACTION SIMULATION IN AN INTERNAL COMBUSTION ENGINE

TRANSFER MATRIX COMPUTATION FOR WAVE ACTION SIMULATION IN AN...

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11th asme biennial conference on engineering systems design and analysis, (ESDA 2012)

作者： Mezher, Haitham Chalet, David Chesse, Pascal Migaud, Jerome Raimbault, Vincent LUNAM Univ Ecole Cent Nantes LMF UMR CNRS 6598 F-44321 Nantes 3 France

ISBN: (纸本)9780791844854

A new technique for simulating engine pressure waves consisting of linking pressure response and mass flow rate excitation in the frequency domain has been presented. this is achieved on the so-called "dynamic flow bench". With this new approach, precise, fast and robust results can be obtained while taking into account all the phenomena inherent to compressible unsteady flows. the method exhibited promising results when it was incorporated in a GT-Power/Simulink coupled simulation of a naturally aspirated engine. However, today's downsized turbocharged engines come with more stringent simulation necessities, where discontinuities such as the charge air cooler (CAC) must be correctly modeled. Simulating such engines with the transfer function methodology is quite difficult because it requires mounting the entire intake line on the bench. Modeling wave action for these engines requires an understanding in the frequency domain of the flow's characteristics through the different elements that make up the intake line. this leads us to study the acoustic transfer matrices. In order to split the intake line into separate elements, a straight duct of 185mm length is chosen as a first reference. It is mounted on the dynamic flow bench and pressure response is measured after an impulse mass flow excitation. Transfer functions of relative pressure and mass flow rate are then identified at given points upstream and downstream of this reference tube. these functions produce the desired transfer matrix poles. the resulting matrix is validated by inserting the tube in the intake lines of two four-cylinder engines which are modeled in GT-Power. Pressure and mass flow are registered at the measurement points of the tube from the simulation. the time series data upstream of the tube is treated in the frequency domain and the transfer matrix is used to calculate the corresponding downstream values. Measured values from the native simulation and those calculated using the transfer mat

关键词： Frequency domain analysis

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asme 2012 Heat Transfer Summer conference Collocated with the asme 2012 Fluids engineering Div. Summer Meeting and the asme 2012 10th Int. Conf. on Nanochannels, Microchannels and Minichannels, HT 2012

ASME 2012 Heat Transfer Summer Conference Collocated with th...

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asme 2012 Heat Transfer Summer conference Collocated with the asme 2012 Fluids engineering Div. Summer Meeting and the asme 2012 10th Int. Conf. on Nanochannels, Microchannels and Minichannels, HT 2012

ISBN: (纸本)9780791844779

the proceedings contain 259 papers. the topics discussed include: modeling gas radiative properties in a rocket motor plume;computational aerothermodynamic analysis of a sphero-biconic shaped vehicle for mars aerocapture;experimental investigation and numerical modeling of natural convection around an infrared montgolfiere balloon at high Rayleigh number;design and construction of an instrumented instructional small scale rankine vapor power cycle by and for undergraduate students;utilizing motion pictures in engineering education: an example in radiation heat transfer;gpu-based molecular dynamics formulation of thermal conductivity predictions for monolayer graphene;and the technical derivation of heat transfer performance of the airside of a novel pin design heat exchanger using computational fluid dynamics.

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PERFORMANCE analysis ON thE INTERNALLY COOLED DEHUMIDIFIER USING TWO LIQUID DESICCANT SOLUTIONS

PERFORMANCE ANALYSIS ON THE INTERNALLY COOLED DEHUMIDIFIER U...

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11th asme biennial conference on engineering systems design and analysis, (ESDA 2012)

作者： Koronaki, I. P. Christodoulaki, R. I. Papaefthimiou, V. D. Rogdakis, E. D. Natl Tech Univ Athens Lab Appl Thermodynam Sch Mech Engn Thermal Engn Sect Athens 15780 Greece

ISBN: (纸本)9780791844854

Liquid desiccant air conditioning systems have recently been attracting attention due to their capability of handling the latent load without super-cooling and then reheating the air, as happens in a conventional compression-type air conditioning system. this paper presents the results from a study of the performance of an internally cooled liquid desiccant dehumidifier. A plate heat exchanger is proposed as the internally cooled element of the dehumidifier and water as the cooling fluid. the desiccant solution is sprayed into the internally cooled dehumidifier from the top and flows down by gravity. At the same time, fresh humid air is blown from the bottom or top, counter-flowing or co-flowing with the desiccant solution. the desiccant is in direct contact with the air, allowing for heat and mass transfer. the cooling water, flowing inside the plates of the dehumidifier, carries out the heat of the crossed air and solution. A heat and mass transfer theoretical model has been developed, based on the Runge-Kutta fixed step method, to predict the performance of the device under various operating conditions. Experimental data from previous literature have been used to validate the model. Excellent agreement has been found between experimental tests and the theoretical model, with the deviation not exceeding +/-4.1% for outlet air temperature and +/-4.0% for outlet humidity ratio. Following the validation of the mathematical model, the dominating effects on the absorption process have been discussed in detail. Namely, effects of flow configuration, air inlet temperature, humidity and flow rate, as well as desiccant inlet temperature, concentration and flow rate have been investigated against the dehumidification rate and the cooling efficiency. the two most commonly used liquid desiccant solutions, namely LiCl and LiBr have been also evaluated against each other. the results suggested that high dehumidification mass rate can be achieved under counter flow between air a

关键词： Liquid desiccant systems desiccant dehumidification plate heat exchanger

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LASER SINTERING PROCESS analysis: APPLICATION TO CHROMIUM-COBALT ALLOYS FOR DENTAL PROSthESIS PRODUCTION

LASER SINTERING PROCESS ANALYSIS: APPLICATION TO CHROMIUM-CO...

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11th asme biennial conference on engineering systems design and analysis, (ESDA 2012)

作者： Faure, S. P. Mercier, L. Didier, P. Roux, R. Coulon, J. F. Garel, S. Trenit, J. Buard, H. Razan, F. Coll Rech Hubert Curien ENS Cachan Antenne Bretagne F-35170 Bruz France

ISBN: (纸本)9780791844878

Rapid prototyping is an effective way to build prototypes. this process, now called AM (Additive Manufacturing), is suited to realize functional single part or for small batch production. Evolution of AM is now in the way of serial production. In the field of medical applications and more precisely dentistry, AM is a way of increasing numbers of elements produced compared to classic production by lost wax casting. To increase production quality, it is necessary to have a high monitoring and control of process and properties of production. In the case of AM using (DMLS: Direct Metal Laser Sintering), a lot of parameters can have an influence on the elements production quality such as powders quality, laser behavior or sintering time... the goal of this work is to study the serial production quality using a DMLS system (Phenix System PM100). this system is used in production of cobalt-chromium elements for dental applications. the study was done on a period of 6 months with recording results of almost 120 productions and was focused on a quantity of around 7000 dental elements produced. In a first part, number of elements per production, room temperature and hygrometry, powder reloading, maintenance, production stops and new operators are recorded. Material properties of some elements produced such as dimensional properties, density, porosity and crystallographic phases are monitored. Materials analysis has led to ensure the elements quality produced by the Phenix system and results are discussed in this work. In a second part, we focused on the production analysis with the recorded data. analysis leads to define 2 ratios: production ratio R-P defined as [Elements Number]/ [Productions Number] and the efficiency production P-E defined as the ratio R-P/[Stopped production number]. By calculating R-P and P-E values with collected data on the Phenix system, a PM 100 efficiency production modeling has been established. the PM 100 production modeling can help to understand

关键词： Production efficiency

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