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Conceptual design of compliant mechanisms using level set method

中国高等学校学术文摘·机械工程 2006年第2期1卷 131-145页

作者： Shi-kui CHEN Michael Yu WANG Computational Modeling and Design Laboratory Department of Automation and Computer-Aided EngineeringThe Chinese University of Hong KongShatinN.T.Hong KongChina

We propose a level set method-based framework for the conceptual design of compliant *** this method,the compliant mechanism design problem is recast as an infinite dimensional optimization problem,where the design variable is the geometric shape of the compliant mechanism and the goal is to find a suitable shape in the admissible design space so that the objective functional can reach a *** geometric shape of the compliant mechanism is represented as the zero level set of a one-higher dimensional level set function,and the dynamic variations of the shape are governed by the Hamilton-Jacobi partial differential *** application of level set methods endows the optimization process with the particular quality that topological changes of the boundary,such as merging or splitting,can be handled in a natural *** making a connection between the velocity field in the Hamilton-Jacobi partial differential equation with the shape gradient of the objective functional,we go further to transform the optimization problem into that of finding a steady-state solution of the partial differential *** the above-mentioned methodological issues,some numerical examples together with prototypes are presented to validate the performance of the method.

关键词： compliant mechanisms conceptual design level set methods shape gradient Hamilton- Jacobi PDE

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A recurrent neural network for non-smooth convex programming subject to linear equality and bound constraints

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13th International Conference on Neural Information Processing, ICONIP 2006

作者： Liu, Qingshan Wang, Jun Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong Shatin New Territories Hong Kong

ISBN: (纸本)3540464816

In this paper, a recurrent neural network model is proposed for solving non-smooth convex programming problems, which is a natural extension of the previous neural networks. By using the non-smooth analysis and the theory of differential inclusions, the global convergence of the equilibrium is analyzed and proved. One simulation example shows the convergence of the presented neural network. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Neural networks

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The generalized Cahn-hilliard equations of multiphase transition for structural topology optimization

The generalized Cahn-hilliard equations of multiphase transi...

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DETC2005: ASME International Design engineering Technical Conferences and computers and Information in engineering Conference

作者： Zhou, Shiwei Wang, Michael Yu Department of Automation and Computer-Aided Engineering Chinese Univ. of Hong Kong Shatin NT Hong Kong

ISBN: (纸本)079184739X

This paper describes a generalized Cahn-Hilliard model for the topology optimization of multi-material structure. Unlike the traditional Cahn-Hilliard model applied to spinodal separation which only has bulk energy and interface energy, the generalized model couples the elastic energy into the total free energy. As a result, the morphology of the small phase domain during phase separation and grain coarsening process is not random islands and zigzag web-like objects but regular truss structure. Although disturbed by elastic energy, the Cahn-Hilliard system still keeps its two most important properties: energy dissipation and mass conservation. Therefore, it is unnecessary to compute the Lagrange multipliers for the volume constraints and make great effort to minimize the elastic energy for the optimization of structural topology. Furthermore, this model also makes the simple interpolation of stiffness tensors reasonable for multi-material structure in real simulation. To resolve these fourth-order nonlinear parabolic Cahn-Hilliard equations coupled with elastic energy, we developed a powerful mutigrid algorithm. Finally, we demonstrate that this new method is effective in optimizing the topology of multi-material structure through several 2-D examples. Copyright © 2005 by ASME.

关键词： Topology

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Asymptotic Solution for Coupled Heat and Mass Transfer During the Solidification of High Water Content Materials

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Transactions of Tianjin University 2010年第4期16卷 239-243页

作者：齐德瑄何凯杜如虚张义同 School of Mechanical Engineering Tianjin University Institute of Advanced Integration Technology Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Department of Automation and Computer-Aided Engineering The Chinese University of Hong Kong

This paper focuses on obtaining an asymptotic solution for coupled heat and mass transfer problem during the solidification of high water content materials. It is found that a complicated function involved in governing equations can be approached by Taylor polynomials unlimitedly, which leads to the simplification of governing equations. The unknown functions involved in governing equations can then be approximated by Chebyshev polynomials. The coefficients of Chebyshev polynomials are determined and an asymptotic solution is obtained. With the asymptotic solution, the dehydration and freezing fronts of materials are evaluated easily, and are consistent with numerical results obtained by using an explicit finite difference method.

关键词： heat transfer mass transfer solidification asymptotic analysis

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Modeling interactions of pulpal tissue with deformable tools in endodontic simulation

Modeling interactions of pulpal tissue with deformable tools...

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2005 IEEE International Conference on Robotics and automation

作者： Li, Min Liu, Yun-Hui Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong Shatin N.T. Hong Kong

ISBN: (纸本)078038914X

Effective and efficient simulation of tissue-tool interactions is the key to a virtual endodontic training system. This paper presents a new force model for effectively simulating the interactions of the pulpal tissue with the endodontic tools. Based on the smoothed particle hydrodynamics (SPH) method, a particle-based pulpal tissue model is proposed, which takes into account characteristics of the tissue and constraints associated with both the tissue and current haptic devices. The stability, accuracy and speed of the proposed model are guaranteed by applying suitable smoothing kernels to calculate different forces applied to the pulpal tissue. Furthermore, a finite element model is used to model the deformation and dynamics of the endodontic tools. We also derive several boundary constraints associated with interactions of the pulpal tissue with the endodontic tools. With this force model, the virtual system can provide the convincing sense of touch of endodontic procedures in real time using current high fidelity haptic devices. © 2005 IEEE.

关键词： Tissue

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A game-theoretic adaptive categorization mechanism for ART-type networks

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International Conference on Artificial Neural Networks, ICANN 2001

作者： Fung, Wai-Keung Liu, Yun-Hui Department of Automation and Computer Aided Engineering The Chinese University of Hong Kong Shatin N.T Hong Kong

ISBN: (纸本)3540424865

A game-theoretic formulation of adaptive categorization mechanism for ART-type networks is proposed in this paper. We have derived the game-theoretic model ΓAC for competitive processes of categorization of ART-type networks and an update rule for vigilance parameters using the concept of learning automata. Numbers of clusters generated by ART adaptive categorization are similar regardless of the initial vigilance parameters ρ assigned to the ART networks as demonstrated in the experiments provided. The proposed ART adaptive categorization mechanism can thus avoid the problem of choosing suitable vigilance parameter a priori for pattern categorization. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Game theory

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Iris recognition for iris tilted in depth

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10th International Conference on computer Analysis of Images and Patterns, CAIP 2003

作者： Chun, Chun-Nam Chung, Ronald Department of Automation and Computer-Aided Engineering The Chinese University of Hong Kong Shatin Hong Kong

ISBN: (纸本)3540407308

The capability of conducting unconscious recognition, in the sense of identifying people without them knowing it, is increasingly important in security and surveillance applications. Iris recognition is one of the few biometric recognition technologies that could serve the purpose. Yet, previous work on iris recognition have all assumed that iris appears as a radially symmetric print in the image data, which might not the case if people do not consciously position their eyes properly to the camera. In unconscious recognition applications iris could be imaged at oblique angle and could appear with substantial eccentricity in the image. This work investigates the improvement of the recognition performance as the image model of iris is allowed to carry substantial eccentricity. Experimental results on real image data show that the improvement could be significant. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Biometrics

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Design and operation of a storage facility in a virtual environment

Design and operation of a storage facility in a virtual envi...

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ICMA 2004 - International Conference on Manufacturing automation: Advanced Design and Manufacturing in Global Competition

作者： Tuncali, Z. Gupta, S.K. Anand, D.K. Yao, Z. Department of Mechanical Engineering University of Maryland United States Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong Hong Kong

ISBN: (纸本)1860584683

This paper demonstrates the design, visualization and analysis of a warehouse in virtual environments. Our motivation is to create an interactive simulation program that allows engineers to create and test their own warehouse configurations with a fairly inexpensive and practical method, i.e. Virtual Reality (VR). Our program allows the user to create the floor plan from scratch, construct the designed structure, optimally store and retrieve incoming items, and finally analyze the design with respect to various performance criteria. © Professional engineering Publishing 2004.

关键词： Virtual reality

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iris recognition for palm-top application 1

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1st International Conference on Biometric Authentication, ICBA 2004

作者： Chun, Chun-Nam Chung, Ronald Department of Automation and Computer-Aided Engineering The Chinese University of Hong Kong Shatin Hong Kong

ISBN: (数字)9783540259480

ISBN: (纸本)3540221468

With palm-top devices increasingly popular, security for both the data contained in the devices and e-commerce transactions through them becomes an issue. iris texture is a nature-given password that has advantages over alphanumeric password and other biometric features. Existing iris recognition systems however are all designed for either mainframe or desktop applications. This paper describes an iris recognition algorithm that is compact and simple enough to be implemented on palm-top devices. The algorithm exploits a simple transformation -- Radon Transform -- to encode iris images. Experimental results on real image data are shown to illustrate how the proposed system performs in comparison with an existing Gabor wavelet coefficient based algorithm. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Authentication

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Video mosaicking for arbitrary scene imaged under arbitrary camera motion

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10th International Conference on computer Analysis of Images and Patterns, CAIP 2003

作者： Cheung, Man-Tai Chung, Ronald Department of Automation and Computer-Aided Engineering The Chinese University of Hong Kong Shatin Hong Kong

ISBN: (纸本)3540407308

Existing mosaic construction algorithms have the following restrictions: (1) the scene is planar or very distant, or (2) the scene is generic but the camera motion is a pure rotation. In either case the registration of images could be captured by a global mapping named planar homography. In this work we address the general case: a generic scene pictured under an arbitrary camera motion. The image data so captured contains parallax that makes the registration of images a difficult problem. We introduce a framework that is capable of constructing mosaic from an image stream of even such a nature. The framework is devised on the basis of an algorithm we refer to as the three-image algorithm that, by the use of a third image, overcomes the parallax problem in registering images. We answer two questions: (1) how an image stream is divided into various 3-image sets for the three-image algorithm to iterate upon;and (2) how intermediate mosaic results over the various 3-image sets are accumulated to compose the overall mosaic at the end. The framework allows uneven sampling, in terms of space or time, of the video stream. Experimental results on real image data are presented to illustrate the performance of the proposed solution. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Geometrical optics

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