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

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

引用

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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Modeling interactions of pulpal tissue with deformable tools in endodontic simulation

Modeling interactions of pulpal tissue with deformable tools...

引用

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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Acquisition of 3D surface temperature distribution of a car body

Acquisition of 3D surface temperature distribution of a car ...

引用

ICIA 2005: 2005 International Conference on Information Acquisition

作者： Ng, Yiu-Ming Harry Du, R. Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong Shatin N.T. Hong Kong

ISBN: (纸本)0780393031

Thermal analysis using Finite Element Modeling (FEM) is widely used in automotive industry nowadays. FEM can give simulation results at design stage. However, as FEM is a kind of simulations, it normally suffers from deviations with experimental results. Therefore, experimental measurement is necessary. To measure the 3D temperature distribution on a car body, we normally use a number of temperature sensors and then record the temperature values according to the positions of the sensors. It can provide the temperature values at different positions. Using this information, we can obtain the 3D temperature distribution on a car body. However, this method is time consuming and inconvenient, as we have to place a number of sensors on a car body, measure its corresponding positions as well as process the measured temperature values. In contrast, we firstly take a sequence of 2D thermal infrared images of the car body to have 2D temperature distribution and then reconstruct the 3D temperature distribution from the 2D images using computer vision method. It provides a more convenient method to acquire 3D temperature distribution compared to using a number of temperature sensors. The experimental results show the feasibility of our method. © 2005 IEEE.

关键词： Temperature distribution

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A real time race classification system

A real time race classification system

引用

ICIA 2005: 2005 International Conference on Information Acquisition

作者： Yongsheng, Ou Xinyu, Wu Huihuan, Qian Yangsheng, Xu Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong Shartin N.T. Hong Kong

ISBN: (纸本)0780393031

This paper presents the progress toward a face detection and race classification system that is robust and works in real-time. We address the race classification problem as classifying a frontal face into Asian or non-Asian. Firstly, we propose principal component analysis (PCA) for feature generation and independent component analysis (ICA) for feature extraction. Then, we use SVM for training process and combine different SVM classifiers to some new classifiers, which improve the classification rate to a new level. Experiments show that our system achieves a classification rate of 82.5 % based on a database containing 750 face images from FERET. © 2005 IEEE.

关键词： Real time systems

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A DNA algorithm for feature selection in condition monitoring of manufacturing processes

A DNA algorithm for feature selection in condition monitorin...

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2005 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2005

作者： Wang, Quan-Fang Du, Ruxu Department of Automation and Computer Aided Engineering Chinese University of Hong Kong Shatin N.T. Hong Kong

ISBN: (纸本)0780392663

This paper proposes a DNA based algorithm for signal processing in condition monitoring of manufacturing processes. Its goal is to find the 'DNA' (feature) of monitoring signal through DNA encoding and analysis. Furthermore, features selection will be implemented for vibration signal collecting from the injection molding machine to verify the DNA algorithm. © 2005 IEEE.

关键词： Algorithms

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Comparative analysis of piezoelectric power harvesting circuits for rechargeable batteries

Comparative analysis of piezoelectric power harvesting circu...

引用

ICIA 2005: 2005 International Conference on Information Acquisition

作者： Guan, Mingjie Liao, Wei-Hsin Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong Shatin N.T. Hong Kong

ISBN: (纸本)0780393031

Using piezoelectric materials to harvest energy from ambient vibrations to power wireless sensors has been of great interest over the past few years. Due to the power output of the piezoelectric materials is relatively low, rechargeable battery is considered as one kind of energy storage to accumulate the harvested energy for intermittent use. Piezoelectric harvesting circuits for rechargeable batteries have two schemes: non-adaptive and adaptive ones. A non-adaptive harvesting scheme includes a conventional diode bridge rectifier and a passive circuit. In recent years, several researchers have developed adaptive schemes for the harvesting circuit. Among them, the adaptive harvesting scheme by Ottman et al is the most promising. This paper is aimed to quantify the performances of adaptive and non-adaptive schemes and to discuss their performance characteristics. © 2005 IEEE.

关键词： Networks (circuits)

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Shoe-Mouse: An integrated intelligent shoe

Shoe-Mouse: An integrated intelligent shoe

引用

IEEE IRS/RSJ International Conference on Intelligent Robots and Systems, IROS 2005

作者： Ye, Weizhong Xu, Yangsheng Lee, Ka Keung Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong EB2 Shatin Hong Kong

ISBN: (纸本)0780389123

In this paper, we developed a sensor-integrated shoe as an information acquisition platform to sense the foot motion. The system is small, portable and wearable. The platform is mainly composed of four parts including a sensing module, a computing module, a wireless communication module, and a data visualization module. Based on this platform, we developed a novel input device called Shoe- Mouse, which can be used by people who have difficulties in using their hands to operate computers or devices. We evaluated the performance of Shoe-Mouse, and the initial experimental results demonstrated the function. The platform can be also used for applications such as gait recognition, human identification, and motion monitoring. © 2005 IEEE.

关键词： Data visualization

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Robust output regulation of linear systems with structural uncertainties

Robust output regulation of linear systems with structural u...

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作者： Fu, Minyue Huang, Jie School of EECS University of Newcastle Australia Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong Hong Kong

ISBN: (纸本)008045108X

in this paper, we study the problem of robust regulation for a class of linear uncertain systems which admit the so-called Recursive Augmentation Structure. This structure is known to be quadratically stabilizable and is a rich class, including lowertriangular and upper-triangular structures (which correspond to the so-called backstepping and forwarding in nonlinear control) as special cases. The results of this paper provide conditions on the Recursive Augmentation Structure under which robust regulation can be achieved. Our work differs from existing work on robust regulation for linear systems in the sense that we allow large uncertainties in the system. Our work is also expected to be useful in searching for possible new structures for regulation control of nonlinear systems. Copyright © 2005 IFAC.

关键词： Linear systems

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Modeling human intelligence and application to space object capturing

Modeling human intelligence and application to space object ...

引用

ICIA 2005: 2005 International Conference on Information Acquisition

作者： Huang, Panfeng Xu, Yangsheng Liang, Bin Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong Shenzhen Space Technology Center Harbin Institute of Technology

ISBN: (纸本)0780393031

It is a great challenge for a robot In space to track and capture a free-flying object in the future space operations. In previous research, most of them employed model-based method which requires robot model in advance. However, it is difficult and time-consuming to obtain the precise mathematical model of robots. Moreover, the computer installed on the space robot is usually not so powerful due to the restriction of weight and volume, thus it is infeasible to computer dynamics parameters for real-time control. To facilitate the computation complexity, we present an approach based on human learning skill for tracking and catching objects. With human-teaching demonstration, the space robot is able to learn and abstract human tracking and capturing skill using an efficient neural-network learning architecture that combines flexible Cascade Neural Networks with Node-Decoupled Extended Kalman Filtering (CNN-NDEKF)[1]. The goal of skill learning is to obtain the most likely human performance from all the training examples and to transfer this skill to the space robot system by trained cascade neural network. We investigate the learning position trajectory in Cartesian space and position trajectory in Joint space respectively. Especially, learning position trajectory in Joint space is useful to avoid the complex inverse kinematics of space robot and to lower the computation cost. The simulation results attest that this approach is useful and feasible in tracking trajectory planning and capturing of space robot. The proposed approach provides a feasible way to plan the tracking trajectory of space robot by learning human demonstration skill. The learning is significant in eliminating sluggish motion planning and correcting a motion command that the operator may mistakenly generate. It will be found useful in various other applications, such as human action recognition in man-machine interfaces, real-time training, and agile manufacturing. © 2005 IEEE.

关键词： Mathematical models

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Global robust stabilization of output feedback systems with unknown high-frequency gain sign

Global robust stabilization of output feedback systems with ...

引用

5th International Conference on Control and automation, ICCA'05

作者： Liu, Lu Huang, Jie Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong Shatin N. T. Hong Kong

ISBN: (纸本)0780391381

The global robust output feedback stabilization problem for nonlinear systems in output feedback form has been solved under a key assumption that the high-frequency gain sign is known. This paper deals with the same problem without assuming the knowledge of the high-frequency gain sign by integrating the current robust control method and the Nussbaum gain technique. © 2005 IEEE.

关键词： Feedback control

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