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共 1251 条记录，以下是481-490 订阅

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STUDY OF thE FREEZING CHUCK FOR NON-TRADITIONAL CLAMPING APPLICATIONS

引用

10th asme biennial conference on engineering systems design and analysis

作者： Jou, Rong-Yuan Natl Formosa Univ Dept Mech Design Engn Huwei Township 632 Yunlin County Taiwan

ISBN: (纸本)9780791849163

A freezing chuck with thermoelectric coolers and coolant channels is investigated. Measurement for freezing/thawing processes and analysis of heat transfer enhancements are conducted. three channel configurations are designed and investigated by numerical simulations and experimental measurements, respectively, to compare the temperature distributions and heat transfer enhancements. Regarding to experiments, inlet temperatures and flow rates of coolants are altered, and transient and steady surface temperatures on the top-plate are measured for these three channel designs. In numerical analysis, convective fluid flows and heat transfers are solved to find temperature, velocity, and pressure fields inside the channel and surface temperatures of top-plate of the freezing chuck by a software package. Comparisons between experimental measurements and numerical simulations are made. Effects of flow rates, inlet coolant temperatures, and channel designs, upon the steady and transient state of temperature distributions and heat transfer enhancements are discussed and conclusions are addressed.

关键词： channel flow chuck heat transfer enhancement refrigeration thermoelectric cooler (TEC)

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Stiffness analysis of a Spatial Parallel Mechanism with flexible moving platform

引用

10th asme biennial conference on engineering systems design and analysis

作者： Rezael, Amir Akbarzadeh, Alireza Enferadi, Javad Ferdowsi Univ Mashhad Mashhad Iran

ISBN: (纸本)9780791849170

In this paper, stiffness analysis of a 3-DOF spatial, 3-PSP type, parallel manipulator is investigated. Most previous stiffness analysis studies of parallel manipulators are performed using lumped model as well as assuming a rigid moving platform. In this paper, unlike traditional stiffness analysis, the moving platform is assumed to be flexible. Additionally, a continuous method is used for obtaining mathematical model of the manipulator stiffness matrix. this method is based on strain energy and Castigliano's theorem [1]. For this purpose, first we solve inverse kinematics problem then We must find relationship between the applied external torques on the moving platform and the resultant joints forces. Next, strain energy moving platform is calculated. Strain energy of this element is calculated using force analysis and inverse kinematics problem. Finally, a FEM model is generated and used to simulate the physical structure. Simulation results are compared with the analytical model.

关键词： stiffness analysis parallel robot inverse kinematics finite element method

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design AND FUZZY CONTROL OF thE SHARK ROBOT-FISH DORSAL FIN USING SMA

引用

10th asme biennial conference on engineering systems design and analysis

作者： Aghbali, Behnam Yousefi-Koma, Aghil Univ Tehran Coll Engn Sch Mech Engn Adv Dynam & Control Syst Lab ADCSL Tehran Iran

ISBN: (纸本)9780791849170

this contribution presents the experimental investigations on design and fabrication of the dorsal fin of the shark robot-fish mechanism which is controlled using NiTi Shape Memory Alloy (SMA) actuators by a Fuzzy controller. the dorsal fin helps the shark not only to turn around, but also it helps shark to roll. this fin contains two main parts, a rigid part;is connected to the shark's body and another part is mounted on the latter one which can be rotated. the rotation angle of the second part is controlled by two parallel SMA wires. the subtlety of this installation is the tension of the right wire, when the left one is actuated. In addition, a fuzzy controller was determined by considering the characteristics of the SMA wires and designated mechanism which has hysteresis response characteristics against heating and cooling.

关键词： Manufacturing Rotation Wire Nickel titanium alloys design Control equipment Fuzzy control Robots Tension Actuators Heating and cooling

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Quantitative Feedback theory controller design for vehicle stability enhancement

Quantitative Feedback Theory controller design for vehicle s...

引用

10th asme biennial conference on engineering systems design and analysis

作者： Mashadi, Behrooz Goharimanesh, Masoud Gharib, Mohammad Reza Majidi, Majid Iran Univ Sci & Technol Tehran Iran

ISBN: (纸本)9780791849170

the main objective of this paper is to use a robust controller based on quantitative feedback theory on vehicle to control it at different work conditions. there are different parameters affecting vehicle stability from which Changes in speed, road condition, vehicle mass, center of gravity position and tire stiffness are the most important parameters in this aspect. In this paper, the various steps of controller design are undertaken and an optimal robust controller is designed. An eight degrees-of-freedom, nonlinear vehicle model is used for the evaluation of controller performance. Several maneuvers are considered for the vehicle motions under different working regimes in order to reveal the effectiveness of the design controller. the simulation results show very good vehicle behavior under controlled actions in situations where the uncontrolled vehicle has undesired behavior. It is also shown that with the presence of different uncertainties, the controller is able to produce accurate desired responses.

关键词： Robust Control uncertainties Quantitative Feedback theory vehicle stability yaw moment control

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design AND FUZZY CONTROL OF A MOVING MAGNETIC LEVITATION DEVICE FOR 3D MANIPULATION OF SMALL OBJECTS

引用

10th asme biennial conference on engineering systems design and analysis

作者： Jazi, Mehdi Molavian Vossoughi, Gholamreza Tajaddodianfar, Farid Sharif Univ Technol Dept Mech Engn CEDRA Tehran Iran

ISBN: (纸本)9780791849194

Magnetic levitation is an appropriate solution for noncontact 3D manipulation. Workspace of the previously proposed maglev systems are confined to a relatively small cube, and this severely limits application of this technology. In addition, most of the previously given mechanisms require design and application of a subsystem for unifying their magnetic field. In this paper, a moving magnet is implemented which results in horizontally extendable work space;moreover, the field unifying section is not needed since one electromagnet only is used. Further, details of the mechanism and finite element based design procedure of the magnet are presented. Dynamic equations of the system derived by finite element analysis of the magnetic field are highly nonlinear and non-affine with respect to the control input. Two decoupled Fuzzy logic based controllers are used to deal with the 3D manipulation of the ball. the designed controllers provide the system with the precise trajectory tracking capability and robust stability. Simulation results confirm the findings.

关键词： magnetic levitation noncontact manipulation finite element fuzzy control

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DYNAMIC analysis OF A HULA-HOOP SYSTEM

引用

10th asme biennial conference on engineering systems design and analysis

作者： Lu, C. H. Sung, C. K. Natl Tsing Hua Univ Dept Power Mech Engn Hsinchu 30013 Taiwan

ISBN: (纸本)9780791849156

this paper presents a theoretical and experimental study into the dynamics of a hula-hoop system, in which a free-rotating mass mimicking the ring is hinged on a main mass that simulates the human body and performs translational reciprocating motion under external excitations. the physical model of the hula-hoop system was first constructed and the equations governing the motions of the main mass and the free-rotating mass were, then, derived. the approximate steady-state solutions were obtained by employing homotopy perturbation method and the stabilities of which were analyzed by using Floquet theory. Good agreement between the results obtained from stability analysis and numerical simulation implied that the approximate solutions were adequate for the dynamic analysis of the proposed model. Finally, an experimental rig consisting of a semicircular thin plate hinged on the top of a linear-motor stage was devised to mimic the hula-hoop motion based on the analytical analysis.

关键词： Hula-hoop motion dynamic analysis homotopy perturbation method

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Dynamic modeling and analysis of a 3 PRS Parallel Mechanism using constrained robotic approach

引用

10th asme biennial conference on engineering systems design and analysis

作者： Tsai, Meng-Shiun Yuan, Wei-Hsiung Natl Chung Cheng Univ Minhsiung Taiwan

ISBN: (纸本)9780791849170

In this paper, a novel model is developed to analyze a 3-PRS parallel mechanism. the 3-PRS mechanism consists of a moving platform which is manipulated by three actuated fingers. Since the fingertips are constrained by the moving platform, three holonomic constraint equations are derived and the associated constraint forces are studied based on the theory of differential geometry. the developed model could be utilized to separate the dynamics of the fingers and that of the moving platform such that the coupling behaviors of the fingers can be investigated. It is found that the reaction forces applied at the fingertips of the parallel manipulator include not only the driving forces to the moving platform but also the constraint forces. Besides, the constraint forces are determined to be internal forces which would not generate a net force or torque to drive the moving platform. Simulations are performed to study the dynamic behavior of the reaction forces and it is found that the constraint forces have significant effect on the actuated fingers.

关键词： Manipulators Simulation Dynamic modeling Dynamics (Mechanics) Torque engineering simulation Robotics Structural mechanics Geometry Parallel mechanisms

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A NUMERICAL APPROACH TO INVESTIGATE MIXED FRICTION systems IN thE MICRO SCALE

A NUMERICAL APPROACH TO INVESTIGATE MIXED FRICTION SYSTEMS I...

引用

10th asme biennial conference on engineering systems design and analysis

作者： Albers, Albert Lorentz, Benoit KIT IPEK Inst Product Engn Karlsruhe Germany

ISBN: (纸本)9780791849156

this article deals with an approach on the numerical analysis of mixed friction systems. By means of the Finite Element Method, the influence of a set of selected parameters on the behavior of frictional contact systems is determined. A two dimensional model is built in a Finite Elements (FE) software and composed of one fluid lubricating two sliding rough surfaces. To model the interactions between the fluid and the solid structure, the Coupled-Eulerian-Lagrangian meshing process is utilized for its ability to simulate large contact domain topology changes occurring when two rough lubricated surfaces are sliding. Based on an axial floating bearing, the model calculates the contact pressure, the stress and also the friction coefficient between the two lubricated solids. the main friction coefficient is separated into solid-solid and fluid-solid friction part. this approach gives the opportunity to identify the influence parameters on the tribological behavior of mixed friction systems.

关键词： Friction Finite element analysis Bearings Pressure Stress Tribology Fluids Topology Numerical analysis Computer software Finite element methods Solids Surface roughness

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design STRATEGY OF A HIGH PRESSURE REGULATOR

引用

10th asme biennial conference on engineering systems design and analysis

作者： Shahani, Amir R. Aryaei, Ashkan Najar, Mosayeb Mohammadi, Sirvan Esmaili, Hamid KN Toosi Univ Technol Dept Mech Engn Tehran Iran

ISBN: (纸本)9780791849187

the main purpose of this paper is to design a high pressure regulator which reduces an input pressure varying between 400 to 500 bars to 350 bars constant pressure. First of all, for mathematical simulation of regulator's performance, the related equations were derived. Because of nonlinearity and coupling, these equations were solved by using numerical methods. Also, the effects of different parameters variation on regulator performance were investigated. One of the most important parameters in regulator performance is the preload of control spring. Deriving the maximum and minimum values of the spring force from the mathematical simulation, the proper spring was designed. In the next step, Finite element analysis, considering thermal effects, was performed using commercial software ABAQUS. To achieve sufficient safety factor, thicknesses were specified by trial and error. the results were in good agreement with the analytical solution.

关键词： Computer software Finite element analysis High pressure (Physics) Simulation Pressure Numerical analysis Temperature effects design Springs Safety Errors

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3D thERMAL analysis OF A POWER SUPPLY BUSBAR STRUCTURE

引用

10th asme biennial conference on engineering systems design and analysis

作者： Plesca, Adrian Scintee, Aline Gheorghe Asachi Tech Univ Iasi Iasi Romania

ISBN: (纸本)9780791849163

Busbar technology is more and more used to realize connections within power supply systems in answer to the need of compactness. the integrated problem on heat conduction and radiation-convective heat exchange describes the temperature regime in current conductors and current carrying busbars of power electrical apparatus such as circuit breakers or high breaking capacity fuses. Beside steady-state conditions, the transient thermal regime of busbar has an important influence upon whole power supply system from thermal behaviour point of view. Hence, a 3D thermal analysis of a power system including fuse, low voltage circuit breaker and busbars connections, using a specific software package based on Finite Element Method, has been done. From 3D thermal modelling and simulations, the thermal transient impedance for the busbar has been computed. this allows a better correlation between protection characteristics of the fuse and circuit breaker and busbar design.

关键词： Computer software Heat Radiation (Physics) Simulation Temperature Power systems (Machinery) Modeling Heat conduction engineering simulation Steady state design thermal analysis Circuit breakers Finite element methods Transients (Dynamics)

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