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ASME 1996 design engineering Technical Conferences and computers in engineering Conference, DETC-CIE 1996

作者： Chen, Chin-Jung Choi, Kyung K. Engineering Analysis Department Modern Engineering Inc. WarrenMI United States Center for Computer-Aided Design Department of Mechanical Engineering College of Engineering The University of Iowa Iowa CityIA United States

ISBN: (纸本)9780791897591

The performance of high-quality products should be insensitive to environmental disturbances. Traditional design attempts to create quality in design by tightening manufacturing tolerances, which leads to high manufacturing cost. In spite of the apparent high-quality, when environmental variations appear, performance of products can be degraded. A robust design methodology is presented in this research, to produce a high-quality and low-cost product. By considering manufacturing tolerances and environmental disturbances early in the design stage, a robust design can be obtained. Because robust design requirements that involve first-order sensitivity are formulated as an optimization problem, to accurately evaluate gradients of constraints, a reliable second-order shape design sensitivity analysis (DSA) method is used. © 1996 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Sensitivity analysis

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The problem of scheduling parallel computations of multibody dynamic analysis is NP-hard

The problem of scheduling parallel computations of multibody...

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ASME 1996 design engineering Technical Conferences and computers in engineering Conference, DETC-CIE 1996

作者： Liu, Jin-Fan Abdel-Malek, Karim A. Department of Mechanical Engineering The University of Iowa Iowa CityIA52242 United States Department of Mechanical Engineering Center for Computer Aided Design The University of Iowa Iowa CityIA52242 United States

ISBN: (纸本)9780791897577

A formulation of a graph problem for scheduling parallel computations of multibody dynamic analysis is presented. The complexity of scheduling parallel computations for a multibody dynamic analysis is studied. The problem of finding a shortest critical branch spanning tree is described and transformed to a minimum radius spanning tree, which is solved by an algorithm of polynomial complexity. The problems of shortest critical branch minimum weight spanning tree (SCBMWST) and the minimum weight shortest critical branch spanning tree (MWSCBST) are also presented. Both problems are shown to be NP-hard by proving that the bounded critical branch bounded weight spanning tree (BCBBWST) problem is NPcomplete. It is also shown that the minimum computational cost spanning tree (MCCST) is at least as hard as SCBMWST or MWSCBST problems, hence itself an NP-hard problem. A heuristic approach to solving these problems is developed and implemented, and simulation results are discussed. © 1996 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： computational complexity

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Analytical criteria for the analysis of design ppropagations in mechanisms

Analytical criteria for the analysis of design ppropagations...

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ASME 1996 design engineering Technical Conferences and computers in engineering Conference, DETC-CIE 1996

作者： Zou, Hong Liu Malek, Karim Abdel Wang, Jia Yi Department of Mechanical Engineering University of Iowa Iowa CityIA52242 United States Center for Computer-Aided Design University of Iowa Iowa CityIA52242 United States

ISBN: (纸本)9780791897584

A broadly applicable formulation for investigating design propagations in mechanisms is developed and illustrated. Analytical criteria in terms of the variations of joint position vectors and orientation matrices for planar and spatial mechanisms are presented. Mechanisms are represented using graph theory and closed loops are converted to a tree-like structure by cutting joints and introducing new constraints. The Jacobian matrix in Cartesian space is then transformed to Joint coordinates space. Two cases are considered: A pair of bodies remain connected by one joint after cutting additional joints and a pair of bodies are disconnected after cutting joints. Using this method, a designer has the ability to study the propagated effect of changing a design variable on the design. The presented formulation is validated through a numerical example of a McPherson strut suspension system. The system is analyzed and an assembled configuration is computed after a change in design. © 1996 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： design

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Numerical formulations for computing design propagations of the spatial slider-crank mechanism

Numerical formulations for computing design propagations of ...

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ASME 1996 design engineering Technical Conferences and computers in engineering Conference, DETC-CIE 1996

作者： Zou, Hong Liu Malek, Karim A. Abdel Wang, Jia Yi Department of Mechanical Engineering University of Iowa Iowa CityIA52242 United States Center for Computer-Aided Design University of Iowa Iowa CityIA52242 United States

ISBN: (纸本)9780791897584

A numerical formulation for studying the design of a spatial slider-crank mechanism is developed and illustrated. The mechanism is modeled using graph theory and closed loops are converted to a spanning tree structure by cutting joints and introducing new constraints. Variations of these constraints with respect to design parameters are derived. A change in link length or link orientation is propagated through the model and a new assembled configuration is computed hence redesigning the mechanism. Constraints are formulated in Cartesian space but computed in relative joint coordinate space. The Jacobian of the constraint is transformed to joint coordinate space in order to compute an assembled configuration for the cut-joint constraint formulation. The experimental code is illustrated through numerical examples where joint-position vectors and orientation matrices are altered. © 1996 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Trees (mathematics)

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Computing an assembled configuration for the mcpherson strut suspension system

Computing an assembled configuration for the mcpherson strut...

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ASME 1996 design engineering Technical Conferences and computers in engineering Conference, DETC-CIE 1996

作者： Zou, Hong Liu Wang, Jia Yi Malek, Karim A. Abdel Alkam, Mohd Department of Mechanical Engineering University of Iowa Iowa CityIA52242 United States Center for Computer-Aided Design University of Iowa Iowa CityIA52242 United States Department of Mechanical Engineering Jordan University of Science and Technology Irbid Jordan

ISBN: (纸本)9780791897584

Geometry analysis for the kinematic design of the McPherson strut suspension system is presented. Analytical formulations for computing variational constraints of spatial joints are derived. Using this method, a designer may alter design variables and determine the propagated effect throughout the underlying mechanism. The McPherson suspension is represented using graph theory and closed loops are converted to a tree-like structure by cutting joints and introducing new constraints. A change in link length or link orientation is propagated through the model and a new assembled configuration is computed. The analytical formulation and its numerical solution methods are presented. The aim of this work is to provide the user of the experimental computer code with a method for the design and redesign of the McPherson suspension system. © 1996 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Struts

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Evaluation of surfaces for automobile body styling 96

Evaluation of surfaces for automobile body styling

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computer Graphics International

作者： Injin Choi Kunwoo Lee Computer Aided Design & Analysis Laboratory Department of Mechanical Design and Production Engineering Production Engineering Seoul National University Seoul South Korea

ISBN: (纸本)0818675187

In the process of car body design, various surfaces can be generated from the given boundary curves. Depending upon the method of the surface generation and the quality of the boundary curves provided, the resulting surfaces may have global or local irregularities in many cases. Thus it would be necessary for the designer to evaluate the surface quality and to modify the surface or to use the different generation method based upon the evaluation results. This capability is very important because the defect of the surface quality detected in the production stage will require the rework on the dies and will cause a big loss in money and time. In this paper, two types of interrogation methods for the assessment of shape quality are described. One is the reflection mapping, which simulates the reflection test on the real part in the production line. This method is useful for detecting global irregularities of a surface. The other is the visualization of the curvature behavior of a surface. The method consists of traditional focal analysis, which exaggerates the mean, Gaussian and strain energy of curvature. This method makes it easier to detect local irregularities.

关键词： Automobiles Reflection Shape Laboratories Production engineering Testing Visualization Capacitive sensors Tail Aircraft

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Structure verification on photolithographic masks based on tolerance criteria by cellular neural networks

Structure verification on photolithographic masks based on t...

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IEEE International Workshop on Cellular Nanoscale Networks and their Applications, (CNNA)

作者： S. Schwarz A. Pohl W. Mathis Theory and Computer Aided Design of Electronic Circuit Department of Electrical Engineering University of Wuppertal Wuppertal Germany Bergische Universitat Wuppertal Wuppertal Nordrhein-Westfalen DE

First of all, the problem of structure verification is introduced with respect to tolerance criteria and their verifications. After that, the basic principle of a verification method for cellular neural networks is motivated by means of local restrictions. Then their solution is presented on the basis of local operators which are only designed with the help of local restrictions of the design rules of the mask structures and their tolerance zones. After that, the result of the successful use of the method is demonstrated on manufacturing and calibration masks. Finally, the debate discusses the competitive position of the method with reference to two standard methods. Last of all, the summary indicates future improvements.

关键词： Cellular neural networks Neural networks Manufacturing Inspection Image processing Cellular networks computer networks Electronic circuits Calibration Lithography

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A finite-element beam-propagation method for strongly guiding optical waveguides with magnetooptic materials

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第7期79卷 22-29页

作者： Tsuji, Y Koshiba, M Tanabe, T Faculty of Engineering Hokkaido University Sapporo Japan 060 Graduated in 1991 from the Department of Electronic Engineering Hokkaido University and received his M.S. degree in 1993. He is currently working toward a doctoral degree. He has been engaged in research on the computer-aided design of optical and quantum-wave phenomena and quantum-effect devices. Graduated in 1971 from the Department of Electronic Engineering Hokkaido University and received his M.S. and Dr. of Eng. degree in 1973 and 1976 respectively. In 1976 he became a Lecturer at Kitami Institute of Technology where he was promoted to an Associate Professor in 1977. In 1979 he became an Associate Professor in the Department of Electronic Engineering Hokkaido University where he was promoted to Professor in 1987. He has been engaged in research on opto- and wave-electronics. In 1987 he received a Best Paper Award. He is the author ofFoundations of Finite Element Method for Opto- and Wave-Electronics(Morikita Publ.)Optical Waveguide Analysis(Asakura Publ.)Optical Waveguide Analysis(McGraw-Hill Book Co.) andOptical Waveguide Theory by the Finite Element Method(KTK Scientific Publishers/Kluwer Academic Publishers). He has co-authored one book and written Graduated in 1995 from the Department of Electronic Engineering Hokkaido University and is currently in the Master's program. He has been engaged in research on opto- and wave-electronics.

To the best of the knowledge of the authors, the formulation is carried out for the first time on the finite-element beam-propagation method for the analysis of the magnetooptic waveguide in which the structure varies along the propagation direction. The present method is applicable not only to the case in which refractive index difference is small but also to the case for the TE mode and the TM mode propagating in a waveguide with a large refractive index difference. To suppress the spurious reflection from the computational window edges, the transparent boundary condition is applied.

关键词： seam-propagation method finite-element method magnetooptical material optical isolator

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Analysis of nonreciprocal mode-conversion properties of magnetooptic channel waveguides using the finite element method

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第10期79卷 32-39页

作者： Zhuang, XP Koshiba, M Tsuji, Y Faculty of Engineering Hokkaido University Sapporo Japan 060 Graduated from the Department of Communication Engineering Guellin Electronic Institute China in 1986. She received her M.S. degree from Hokkaido University in 1991 and was admitted to the doctoral program. She has been engaged in research on the optimum design of magnetooptic waveguides for nonreciprocal optical devices. Graduated in 1971 from the Department of Electronic Engineering Hokkaido University where he received his M.S. degree in 1973 and his Dr. of Eng. degree in 1976. In 1976 he became a Lecturer in the Department of Electronic Engineering Kitami Institute of Technology where he was promoted to Associate Professor in 1977. In 1979 he became an Associate Professor at Hokkaido University where he was promoted to Professor in 1987. He has been engaged in research on optical and wave electronics. In 1987 he received a Best Paper Award. He is the author ofFundamentals of Finite Element Method of Optics and Waves(Morigkata Publ.)Optical Waveguide Analysis(Asakura Publ.)Optical Waveguide Analysis(McGraw-Hill Book Co.) andOptical Waveguide Theory by the Finite Element Method(KTK Scientific Publishing/Kulwer Academic Publishers). He is also co-author of one book and has written chapters in six other books. He is a member of the Institute of Television Engineers of Japan the Institute of Electrical Engineers of Japan the Japan Society for Simulation Technology the Japan Society for Computational Methods in Engineering and the Japan Society of Applied Magnetics and Mechanics. He is also an IEEE Senior Member. Graduated in 1991 from me Department of Electronic Engineering Hokkaido University where he received his M.S. degree in 1993. He is currently in the doctoral program. He has been engaged in research on quantum wave phenomena and computer-aided design of optical and quantum effect devices.

To evaluate nonreciprocal mode conversion characteristics in a magnetooptic channel waveguide, a finite element analysis based on the scalar wave approximation is formulated for the first time. A simple iterative calculation method is conceived for solution of the nonlinear eigenvalue equations finally obtained in which the two polarizations are coupled. Specifically, the maximum isolation ratio in the mode-conversion-type magnetooptic rib guide was evaluated and the validity of the method is confirmed by comparison with published experimental results.

关键词： nonreciprocal optical devices magnetooptic waveguide nonreciprocal mode conversion finite element method numerical analysis

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A METHOD TO RESOLVE AMBIGUITIES IN CORNER-CORNER INTERACTIONS BETWEEN POLYGONS IN THE CONTEXT OF MOTION SIMULATIONS

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engineering computationS 1995年第2期12卷 135-144页

作者： KRISHNASAMY, J JAKIELA, MJ Computer Aided Design Lab Department of Mechanical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA

The motion of systems of polygonal objects is characterized by discontinuities due to changes in the set of contacts between polygons. Effective simulations of such a motion requires a simulation scheme that can automatically update the set of contacts during the simulation. This article focuses on a contact updating problem that arises when a penalty based contact model is used. A penalty based model requires a finite overlap of contacting polygons. This overlap results in ambiguities in characterizing corner-corner contact between polygons. A simple yet effective scheme to overcome such ambiguities is presented.

关键词： CONTACT UPDATING CORNER-CORNER CONTACT

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