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3rd International Symposium on Neural Networks, ISNN 2006 - Advances in Neural Networks

作者： Zeng, Zhigang Wang, Jun School of Automation Wuhan University of Technology Wuhan Hubei 430070 China Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong Shatin New Territories Hong Kong

ISBN: (纸本)354034439X

In this paper, discrete-time cellular neural networks with one-dimensional space invariant are designed to associative memories. The obtained results enable both heteroassociative and autoassociative memories to be synthesized by assuring the global asymptotic stability of the equilibrium point and the feeding data via external inputs rather than initial conditions. It is shown that criteria herein can ensure the designed input matrix to be obtained by using one-dimensional space-invariant cloning template. Finally, one specific example is included to demonstrate the applicability of the methodology. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Neural networks

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Experimental studies on carbon nanotube composites for vibration damping

Experimental studies on carbon nanotube composites for vibra...

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17th International Conference on Adaptive Structures and Technologies, ICAST 2006

作者： Dai, R.L. Liao, W.H. Smart Materials and Structures Laboratory Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong Shatin N.T. Hong Kong

ISBN: (纸本)9781605601250

It has been found that the composites of carbon nanotubes (CNTs) and epoxy resin could greatly enhance damping ability while the stiffness is kept at a very high level. In this research, carbon nanotube enhanced epoxy resin is fabricated. The dynamic properties of the nanotube composites are experimentally studied. A testing apparatus for obtaining material properties is set up and measurement procedures are given. Multiple groups of specimens are made for investigations. In particular, the material loss factors together with dynamic stiffness are measured for the specimens with different CNT weight ratio. Experimental results show that CNT additive can provide the composite with significant damping without easily undergoing large strain as compared to traditional damping materials, and the dynamic stiffness of the nanotube composite could be even higher than the pure epoxy. It is promising that the nanotube composites could be used in the structural vibration applications when both damping and stiffness are important.

关键词： Carbon nanotubes

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Shock performance of a disk-drive assembly using active-passive piezoelectric actuators

Shock performance of a disk-drive assembly using active-pass...

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Asia-Pacific Magnetic Recording Conference 2006, APMRC 2006

作者： Chan, K.W. Liao, W.H. Smart Materials and Structures Laboratory Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong Shatin N. T. Hong Kong

ISBN: (纸本)1424408636

Current dual-stage actuator design uses withut pssiv daming. piezoelectric patches only In this paper, we propose a dual-stage servo system using enhanced active-passive hybrid piezoelectric actuators. The proposed configuration will improve the existing dual-stage actuators for higher precision and shock resistance, due to the incorporation of passive damping in the design. Finite element analyses of different types of piezoelectric actuators in a disk arm assembly under shock impulse are reported. In the shock test, a 175 g and 1 ms sinusoid acceleration pulse is applied at one end of the base and other end of the base is fixed. The shock responses of the disk arm assembly with different configurations of the piezoelectric actuators are simulated and compared. In the finite element analysis, the viscoelastic damping layers in the hybrid actuators are modeled with the Prony series, which parameters are determined from dynamic frequency data of nomograph.

关键词： Piezoelectric actuators

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A delayed lagrangian network for solving quadratic programming problems with equality constraints

A delayed lagrangian network for solving quadratic programmi...

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3rd International Symposium on Neural Networks, ISNN 2006 - Advances in Neural Networks

作者： Liu, Qingshan Wang, Jun Cao, Jinde Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong Shatin New Territories Hong Kong Department of Mathematics Southeast University Nanjing 210096 China

ISBN: (纸本)354034439X

In this paper, a delayed Lagrangian network is presented for solving quadratic programming problems. Based on some known results, the delay interval is determined to guarantee the asymptotic stability of the delayed neural network at the optimal solution. One simulation example is provided to show the effectiveness of the approach. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Lagrange multipliers

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Genetic algorithms-based minimum torque path planning for space manipulator

Genetic algorithms-based minimum torque path planning for sp...

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6th World Congress on Intelligent Control and automation

作者： Huang, Panfeng Yan, Jie Xu, Yangsheng Xu, Wenfu Liang, Bin College of Astronautics Northwestern Polytechnical University China Automation and Computer-Aided Engineering Chinese University of Hong Kong Hong Kong Hong Kong Shenzhen Space Technology Center Harbin Institute of Technology China

ISBN: (纸本)1424403316

In space environment, the power supply for space manipulator is limited because of lower ratio of the solar array. Therefore, the space manipulator's trajectory should be optimum so that the torque of manipulator can be minimized in order to save the power. This paper presents a minimum-torque path planning scheme for space manipulator. In this formulation, Genetic Algorithm (GA) is used to minimize the objective function. The planning procedure is performed in joint space and with respect to all constraints, such as joint angle constraints, joint velocity constraints, torque constraints. We use a GA to search the optimal joint inter-knot parameters in order to realize the minimum-torque. These joint inter-knot parameters mainly include joint angle and joint angular velocities. The simulation results test that the proposed minimum-torque path planning method has satisfactory performance.

关键词： space manipulator path planning minimum-torque genetic algorithms

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Modified Smith Predictor and controller for time-delay process with uncertainty

Modified Smith Predictor and controller for time-delay proce...

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6th World Congress on Intelligent Control and automation, WCICA 2006

作者： Wang, Shihua Xu, Bugong Wang, Qingyang Liu, Yun-Hui Lab. of Real-Time Control Through Internet and Fieldbuses College of Automation Science and Engineering South China Univ. of Technology Guangzhou 510640 China Dept. of Automation and Computer Aided Engineering Chinese University of Hong Kong Shatin NT Hong Kong

ISBN: (纸本)1424403324

Smith Predictor is very sensitive to uncertain system with variable time-delay. Using dual-locus diagram method, we first analyse the essence of Smith Predictor's sensitivity and present a proposition to illustrate the system stability criteria with relation to system gain and time-delay variation. Then a new modified Smith Predictor is proposed to compensate the variable time-delay system with uncertain model for set-point tracking. After that, we discuss the system internal stability and give two-degree freedom controller self-adaptive to eliminate the impact of system uncertainty with varying time-delay. Examples show the improved performance compared to previous Modified Smith Predictor structures. © 2006 IEEE.

关键词： Uncertain systems

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THE CAHN-HILLIARD PHASE-FIELD MODEL FOR TOPOLOGY OPTIMIZATION OF SOLIDS

Solid Mechanics and its Applications

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Solid Mechanics and its Applications 2006年 142卷 133-141页

作者： Wang, M.Y. Zhou, S. Department of Automation & Computer-Aided Engineering The Chinese University of Hong Kong Shatin NT Hong Kong

In this paper we present a method to optimize the topology of a solid structure based on the theory of phase transition with diffuse interface. A well-known physical model describing phase separation, the Cahn-Hilliard model is modified to reflect the objective of the design optimization. The topology optimization is formulated with a phase parameter that varies continuously at any position within the specified design domain. The relaxation of the parameter is driven by local minimization of the free energy of the system, including the design objective, the bulk energy, and the interface energy. The bulk energy plays a role to draw the design variable to its two distinct material phases (solid and void), while the interface energy smoothes the structure boundary to its minimum perimeter. With properties of mass conservation and energy dissipation of the model, complex morphological and topological material transitions such as coalescence and break-up of the boundary can be naturally captured. A thermodynamic equation for the phase parameter is obtained for the creation, evolution, and dissolution of controlled phase interfaces. We use a multigrid method to solve the resulting fourth-order Cahn-Hilliard equation. The capabilities of the method are demonstrated with three examples in 2-D for the mean-compliance minimization of structures. © 2006 Springer. Printed in the Netherlands.

关键词： Phase interfaces

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Expert Label Pattern Design System

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WSEAS Transactions on computers 2006年第9期5卷 2077-2083页

作者： Liu, C.Y. Du, R. Department of Automation and Computer-aided Engineering The Chinese University of Hong Kong Shatin NT Hong Kong

A label is a necessity part of a garment. It is attached to clothing to state the fabric contents, care instructions, and etc. For most of the current label pattern design software, the designer needs to create a new pattern file for each new label to be produced. This paper presents an "Expert Label Pattern Design System" that is aimed at automating this tedious label pattern design process. The expert system is implemented using Frame-base Expert System. A software, namely "VLabel", is developed for this system using Visual C++ in the Window® environment. The system has been developed and tested by an industrial sponsor, SML Group Limited. It has been proven to work well and used for production in the shop floor now.

关键词： Expert systems

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Weld-bead movement of multi-gauge tailor-welded blank during drawing square cup with reverse-convex

Weld-bead movement of multi-gauge tailor-welded blank during...

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International Conference on Manufacturing Science and engineering, MSEC 2006

作者： Chen, Wei Du, Ruxu Guo, Weigang Institute of Die and Mould Technology School of Mechanical Engineering Jiangsu University Jiangsu Zhenjiang 212013 China Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong Shatin N. T Hong Kong

To decrease the weight of auto panels and reinforce the safety of vehicles, the tailor-welded blank (TWB) has been used widely in the auto panels manufacturing. Basic principles and advantages of TWB are described at first. Then the technologies of numerical simulation modeling for TWB are researched. By means of numerical simulation, the weld-bead movement and formability of TWB with the same mechanical property and multi-gauges are investigated. After analyzing the weld-bead movement in three different drawing depth combinations with same total deformed depth, some conclusions of weld-bead movement are drawn finally. It reveals the relationships between the weld-bead movement and formability of multi-gauge TWB. Copyright © 2006 by ASME.

关键词： Weldability

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Single landmark based self-localization of mobile robots

Single landmark based self-localization of mobile robots

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3rd Canadian Conference on computer and Robot Vision, CRV 2006

作者： Bais, Abdul Sablatnig, Robert Gu, Jason Institute of Computer Technology Vienna University of Technology Vienna Austria Pattern Recognition and Image Processing Group Institute of Computer Aided Automation Vienna University of Technology Vienna Austria Robotics Research Group Department of Electrical and Computer Engineering Dalhousie University Halifax Canada

ISBN: (纸本)0769525423

In this paper we discuss landmark based absolute localization of tiny autonomous mobile robots in a known environment. Landmark features are naturally occurring as it is not allowed to modify the environment with special navigational aids. These features are sparse in our application domain and are frequently occluded by other robots. This makes simultaneous acquisition of two or more landmarks difficult. Therefore, we propose a system that requires a single landmark feature. The algorithm is based on range measurement of a single landmark from two arbitrary points whose displacement can be measured using dead-reckoning sensors. Range estimation is done with a stereo vision system. Simulation results show that the robot can localize itself if it can estimates range of the same landmark from two different position and if the displacement between the two position is known. © 2006 IEEE.

关键词： Mobile robots

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