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“Shape Interrogation for computer aided design and Manufacturing

引用

Structural and Multidisciplinary Optimization 2002年第6期24卷 467-468页

作者： Horváth, I. Section of Computer Aided Design and Engineering Department of Design Engineering Faculty of Industrial Design Engineering Delft University of Technology e-mail: :i.horvath@io.tudelft.nl NL

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design optimization for structural-acoustic problems using FEM-BEM

Design optimization for structural-acoustic problems using F...

引用

作者： Choi, Kyung K. Dong, Jun Kim, Nam Ho Center for Computer-Aided Design Department of Mechanical and Industrial Engineering University of Iowa Iowa City IA 52242 United States Department of Mechanical Engineering University of Florida PO Box 116300 Gainesville FL 32611-6300 United States

ISBN: (纸本)0791836215

A structural-acoustic design optimization of a vehicle is presented using finite element and boundary element analyses. The steady-state dynamic behavior of the vehicle is calculated from the finite element frequency response analysis, while the sound pressure level within the acoustic cavity is calculated using the boundary element analysis. A reverse solution procedure is employed for the design sensitivity calculation using the adjoint variable method. An adjoint load is obtained from the acoustic boundary element re-analysis, while the adjoint solution is calculated from the structural dynamic reanalysis. The evaluation of pressure sensitivity only involves a numerical integration process for the structural part. Two design optimization problems are formulated and solved. It has been shown that the structural weight is saved when the noise level is maintained, and the weight needs to increase in order to reduce the noise level in the passenger compartment. Copyright © 2002 by ASME.

关键词： Boundary element method

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Planning for kinematically smooth manipulator trajectories

Planning for kinematically smooth manipulator trajectories

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作者： Mi, Zan Yang, Jingzhou Abdel-Malek, Karim Jay, Laurent Center for Computer Aided Design Department of Mechanical and Industrial Engineering University of Iowa Iowa City IA 52242 United States Department of Mathematics University of Iowa Iowa City IA 52242-1419 United States

ISBN: (纸本)0791836215

This paper presents a general methodology and accompanying formulation for planning kinematically smooth path trajectories for serial robot manipulators. Starting from an initial point on the path, it is required to traverse a path trajectory without halting the motion (typically due to switch from one inverse solution to another). The problem focuses on determining a starting configuration at the initial point on the path. The problem is formulated in terms of a constraint function and characterized by a system of differential-algebraic equations (DAEs) of index 2. These DAEs are solved numerically by Runge-Kutta (RK) methods while a best starting configuration is chosen using a cost-function driven optimization method. The formulation is demonstrated through a planar 3 degree of freedom robot manipulator. Copyright © 2002 by ASME.

关键词： Trajectories

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Analysing trade-offs in scan power and test data compression for systems-on-a-chip

Analysing trade-offs in scan power and test data compression...

引用

作者： Rosinger, P.M. Gonciari, P.T. Ai-Hashimi, B.M. Nicolici, N. Electronic Systems Design Group Department of Electronics and Computer Science University of Southampton Southampton SO17 1BJ United Kingdom Computer-Aided Design and Test Research Group Department of Electrical and Computer Engineering McMaster University 1280 Main St. W. Hamilton Ont. L8S 4K1 Canada

The relationship is investigated between test data compression and power dissipation during scan testing. It is shown how combining a proposed symmetric coding scheme and a weighted scan latch reordering (W-SLR) algorithm allows efficient exploration of the scan power and test data compression solution space. This is achieved by reducing and balancing the transition activity in the scan-in and scan-out sequences. This will impact the test data compression, which depends only on the scan-in sequence, and the overall scan power dissipation, which depends on the scan-in and scan-out sequences. Trade-off analysis using ISCAS89 benchmark circuits shows that, by employing the proposed symmetric coding scheme and varying a weighting parameter in the W-SLR algorithm, the embedded core designer can easily and explicitly control the scan power and volume of test data. The proposed asymmetric/symmetric code transformation is equally applicable to (and thus it maintains its benefits) any asymmetric 'run length' coding scheme.

关键词： Data compression

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Shape optimization of two-dimensional automotive components using a Meshfree method

Shape optimization of two-dimensional automotive components ...

引用

9th AIAA/ISSMO Symposium on Multidisciplinary Analysis and Optimization 2002

作者： Botkin, Mark E. Wang, Hui-Ping Kim, Nam Ho Choi, Kyung K. GM R and D Center Warren MI 48090-9055 United States Department of Mechanical Engineering University of Florida PO Box 116300 Gainesville FL 32611-6300 United States Center for Computer Aided Design College of Engineering The University of Iowa Iowa City IA 52242 United States

ISBN: (纸本)9781624101205

The Reproducing Kernel Particle Method (RKPM) is one of several so-called meshfree methods of structural analysis and has been applied in this paper to the gradient-based shape optimization of two-dimensional automotive components. As indicated by the term meshfree, no mesh is required, but rather a field of points, or particles, are distributed within the domain of the problem. Three standard linear examples are chosen to allow a comprehensive comparison between the optimization with the RKPM and the state-of-art optimization tool in Unigraphics Version 18 (UG V18). The results show that the optimization analysis with the RKPM is able to accommodate very large shape changes required in the optimization process without doing particle re-adaptation, and provides accurate solutions of the objective and constraint functions and their gradients, therefore facilitates a fast convergence of the gradient-based optimization algorithm. © 2002 by General Motors Corp.

关键词： Shape optimization

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A cap as interface for wheelchair control

A cap as interface for wheelchair control

引用

IEEE International Workshop on Intelligent Robots and Systems (IROS)

作者： C.K.H. Law M.Y.Y. Leung Y. Xu S.K. Tso Department of Automation and Computer Aided Engineering Chinese University of Hong Kong Hong Kong China Center for Intelligent Design Automation and Manufacturing City University of Hong Kong Hong Kong China

Many disabled people do not have the dexterity necessary to use a joystick or other hand interface for controlling a standard robotic wheelchair. In many cases, they suffer from diseases which have damaged most of the nervous and muscular system in their body, but leave the brain and eye movement unimpaired. To this end, we developed an interface which enables the user to guide a robotic wheelchair by eye-gaze, using a minimal number of electrodes attached on the head. The device can measure the electro-oculographic potential of the eye-gaze movement together with the electromyographic signals from the jaw muscle motion. By coupling these simple actions, one is able to navigate a wheelchair solely by the eye and jaw movements, which provides an aid to mobility for severely disable people.

关键词： Wheelchairs Mobile robots Navigation Electrodes Eyes Manufacturing automation Robotics and automation Intelligent robots Electrooculography Robot sensing systems

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Learning human navigational skill for smart wheelchair

Learning human navigational skill for smart wheelchair

引用

IEEE International Workshop on Intelligent Robots and Systems (IROS)

作者： Hon Nin Chow Yangsheng Xu S.K. Tso Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong Hong Kong China Centre for Intelligent Design Automation and Manufacturing City University of Hong Kong Hong Kong China

In practice, the environments in which mobile robots operate are usually modeled in highly complex geometric representations, and as a result real-time autonomous navigation can be difficult. Such difficulty is even exacerbated for robots with limited but more realistic on-board computational resources since this paradigm of environmental modeling requires enormous computational power. Inspired from human daily life experience, we propose in this paper a new direction for practical robotics navigation system with locally sensed non-geometric environmental modeling. With human-guided demonstrations, the robot can learn and abstract human navigational skill in the form of reactive sensor-motor mapping to navigate in the demonstrated route with simultaneous obstacle avoidance, localization, path and trajectory planning. Learning in a cascade neural network with node-decoupled extended Kalman filtering is adopted as the basis for such reactive mapping. Preliminarily experimental results show the feasibility of this practical approach.

关键词： Humans Navigation Wheelchairs Robot sensing systems Mobile robots Power system modeling Solid modeling computational modeling Simultaneous localization and mapping Trajectory

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Distributed multibody dynamic analysis within product development

Distributed multibody dynamic analysis within product develo...

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Proceedings of the 2001 ASME design engineering Technical Conference and computers and Information in engineering Conference

作者： Larsson, Tobias Larsson, Andreas Karlsson, Lennart Division of Computer Aided Design Department of Mechanical Engineering Luleå University of Technology SE-971 87 Luleå Sweden

A method that supports distribution of multibody dynamic analysis is proposed and developed. Ethnographic methods are used as a means for gaining a deeper understanding of the engineering analysis work practice, and the findings form the base for a cooperative design of the system. The concept of design rationale is applied in order to deal with current problems of engineering analysis, such as irrelevant input and output, as well as satisfying the need for useful, real-time feedback. The web based simulation environment, applied to vehicle system dynamics, contains the simulation packages ADAMS and MATLAB and incorporates database technology. The possibility to distribute simulation models and results, from simulation experts to design experts and engineers, as well as subcontractors, is created. The proposed method requires changes in the existing multibody dynamic simulation methodology regarding aspects of incorporation in product development theories.

关键词： Product development

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designing of LAN models for diagnosis problem solving

Designing of LAN models for diagnosis problem solving

引用

International Conference on CAD Systems in Microelectronics (CADSM)

作者： V.I. Hahanov A.V. Babich A. Zanuneh I.M. Hafil Computation Engineering Computer-Aided Design Department Kharkov State Technical University of Radioelectronics Kharkov UKRAINE

An approach to LAN model creation with regard to problems of digital device technical diagnosis is proposed. The problems discussed include model analysis (fault simulation), test generation and defect search. Program implementation of models and procedures in the VHDL language and use of CAD active-HDL have confirmed the efficiency of the models.

关键词： Local area networks Problem-solving computer networks Network topology design engineering design automation Equations Logic testing computational modeling Hardware

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Test generation for digital device on FPGA, CPLD

Test generation for digital device on FPGA, CPLD

引用

International Conference on CAD Systems in Microelectronics (CADSM)

作者： A. Shkil O. Skvortsova M.M.D. Mehedy H.H.M. Jahirul Computation Engineering Computer-aided Design Department Kharkov Technical University of Radioelectronics (KTURE) Kharkov UKRAINE

The algorithm of test generation based on faults lists cubic cover (FLCC) and single logical path sensitization is offered. The realization of the algorithm is oriented to Field Programable Gate Arrays (FPGAs) up to 200000 gates, including more than 20 types of trigger structures. The projects language description - VHDL, supports the design systems of corporations Aldec and Xilinx.

关键词： Field programmable gate arrays Circuit testing Circuit faults design engineering design automation Signal processing algorithms Fault detection Programmable logic arrays Equations Logic testing

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