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共 1252 条记录，以下是71-80 订阅

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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

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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

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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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MECHANICAL design AND analysis OF AN INTELLIGENT OIL WELL SENSORY SYSTEM

引用

10th asme biennial conference on engineering systems design and analysis

作者： Salmasi, Atefeh Yousefi-Koma, Aghil Soorgee, Mohammad Hossein Univ Tehran ADCSL Sch Mech Engn Coll Engn Tehran Iran

ISBN: (纸本)9780791849163

Optimal revenue of oil and gas fields is of interest due to high price and limited amount of these sources of energy. In this way, smart well technology provides a numerous range of benefits and for these great advantageous is widely used in oil/gas industry. this technology involves down-hole measurement and control of well bore and reservoir flow. One of the most important down-hole control subsystems in a smart well is pressure and temperature sensing system which can help the reservoir being modeled accurately. the purpose of this paper is to design and analysis a new sensory package for a desired oil well. A brief review of the advantages of fiber optic sensing technology in smart well control system is performed. Having studied several possibilities of installation systems for sensors, a new arrangement and casing for temperature/pressure sensor is developed here. Effect of pressure and temperature on stress distribution in the casing has been investigated and a suitable casing is obtained.

关键词： intelligent well fiber optic sensor Finite Element Modeling

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WORKSPACE OPTIMIZATION OF A SIX DEGREES OF FREEDOM PARALLEL MANIPULATOR FOR MICROMACHINING

引用

10th asme biennial conference on engineering systems design and analysis

作者： Agaoglu, Ahmet Ciblak, Namik Safak, Koray K. Yeditepe Univ Dept Mech Engn TR-34755 Istanbul Turkey

ISBN: (纸本)9780791849170

this work addresses the optimization of the workspace of a six degrees of freedom parallel manipulator. In this study, the topology of the manipulator is composed of three xy-ables, symmetrically positioned on a circle on a base plane, connected by three legs to a moving platform. Kinematic composition of the manipulator is introduced and kinematic diagram is illustrated. Orientation workspace is investigated using three different orientation representations. XYZ fixed angles representation is selected considering the benefits of its visualization are considered. By using this representation, the orientation workspace is modeled and kinematic circuits of the manipulator are explored. First, optimization is performed without slider limitations. A result table is obtained based on the user defined parameters. Secondly, optimization is performed under slider limitations. the maximal orientation capability is optimized using numerical analysis. the optimized configuration of the manipulator indicates that a 330% increase in orientation capability is achieved, compared to the old configuration.

关键词： Manipulators Topology Kinematics Optimization Visualization Numerical analysis Circuits Micromachining Degrees of freedom

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Effects of Inlet Geometry on the Pressure Drop and Collection Efficiency of Tangential Inlet Cyclones

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10th asme biennial conference on engineering systems design and analysis

作者： Teke, Mehmet Karagoz, Irfan Uludag Univ FIGES AS Bursa Turkey

ISBN: (纸本)9780791849170

this work presents a computational fluid dynamics simulation to investigate the effects of inlet geometry on the pressure drop and particle collection efficiency of a tangential inlet cyclone. three-dimensional, steady governing equations for the incompressible, turbulent flow inside a tangential inlet cyclone are solved numerically under certain boundary conditions. the continuous gas flow is predicted by solving Navier-Stokes equations using the differential RSM turbulence model. the second phase is modeled based on a Lagrangian approach. the commercial CFD code Fluent was used for numerical analysis. Computational results compared experimental data available in the literature for validation. Various cyclones, each has different geometrical ratio of inlet section, studied in this paper Detail analyses of the effects of inlet geometry on the flow behavior, pressure drop and collection efficiency were given.

关键词： Turbulence Particulate matter Flow (Dynamics) Pressure drop Navier-Stokes equations Simulation Numerical analysis Boundary-value problems Geometry Computational fluid dynamics Gas flow

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NUMERICAL APPROACH TO design PROCESS OF ARMORED VEHICLES

引用

10th asme biennial conference on engineering systems design and analysis

作者： Erdik, Atil Kilic, Namik Guden, Mustafa Tasdemirci, Alper Otokar Otomot & Savunma Sanayi AS CAE Dept Sakarya Turkey

ISBN: (纸本)9780791849187

Today, it is imperative that armored vehicles need advanced protection kits against anti-symmetric threats more than before. the primary goal of this study was to assess benefits of explicit hydrocodes for mine protection resistance of armored vehicles. An analysis of an armored vehicle under blast loading caused by high explosive (HE) detonation is presented with comparison to a full-scale test. the problem was examined using LS-DYNA which is an explicit non-linear finite element code. Multi Material Arbitrary Lagrangian Eulerian (MM-ALE) Fluid Structure Interaction Method was selected to model the explosion domain so as to observe advancing of the shock wave in the compressed air and to investigate the effects of blast on the vehicle structure after explosion. Johnson-Cook constitutive material model, Jones-Wilkins-Lee (JWL) and Linear Polynomial equation of states were used for the problem. Results show that numerical analysis was in good agreement with the experimental result.

关键词： Finite element analysis Vehicles Numerical analysis Compressed air design Shock waves Explosives Fluid structure interaction Polynomials Explosions

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Historical progression of mathematizing vibro-acoustic problems

引用

asme 2010 10th biennial conference on engineering systems design and analysis (ESDA2010)

作者： Öǧüç, Mete Mechanical Engineering Department Yeditepe University 34755 Kadiköy Istanbul Turkey

ISBN: (纸本)9780791849163

Some of celebrated geometers whom are acknowledged as to be the pioneers of scientific revolution have worked on acoustics and modeling of vibration of structures. they made great contributions on both the physical understanding and the mathematical modeling of these phenomena. the historical stream of physical understanding of sound propagation, foundations of the mathematical background of vibration mechanics and the instruments that reinforced the conceived theory of acoustics led to the advanced concept of modern vibro-acoustic engineering. A historical investigation is made on the early engineering approaches on vibro-acoustic engineering problems to comprehend the evolution of acoustic engineering and its place in modern era. Copyright © 2010 by asme.

关键词： Acoustic wave propagation

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