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Study on Key Issues of the One-step Inverse Method

武汉理工大学学报 2006年第S1期28卷 116-120页

作者： HUANG Ying 1,2 ,RUAN Yi1,DU Ruxu2 (1.College of Logistic engineering,Wuhan University of Technology,Wuhan 430070,China 2.Department of automation & computer-aided engineering,The Chinese University of Hong Kong,Hong Kong,China) College of Logistic Engineering Wuhan University of TechnologyWuhan 430070China Department of Automation & Computer-Aided Engineering The Chinese University of Hong KongHong KongChina College of Logistic Engineering Wuhan University of TechnologyWuhan 430070China Department of Automation & Computer-Aided Engineering The Chinese University of Hong KongHong KongChina

Even though the inverse method is less accurate than that of the incremental one,it has great potential in the conceptual design stage for its less calculation load and quick speed. However,it faces a number of unsolved problems,which limit its application. The first question is how to find a suitable initial solution while the other one is how to deal with the numerical problems caused by the vertical walls. In this paper,new methods have been proposed to solve above two questions. The methods have also been coded and applied to two parts to test its feasibility.

关键词： sheet metal forming inverse method modified arc-length method

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RAM POSITION CONTROL IN PLASTIC INJECTION MOLDING MACHINES WITH HIGHER-ORDER ITERATIVE LEARNING

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CONTROL AND INTELLIGENT SYSTEMS 2006年第1期34卷 64-72页

作者： Li, X. Ouyang, G. Guan, X. P. Du, R. Institute of Electrical Engineering Yanshan University Qinhuangdao Hebei 066004 China Department of Automation and Computer Aided Engineering Chinese University of Hong Kong Hong Kong Hong Kong City University of Hong Kong Hong Kong Hanover University Germany University of Birmingham United Kingdom Institute of Electrical Engineering Yanshan University China Institute of Electrical Engineering Yanshan University Qinhuangdao China IEEE China Council of Chinese Automation Committee China Council of Chinese Artificial Intelligence Committee China Department of Automation and Computer Aided Engineering Chinese University of Hong Kong (CUHK) Hong Kong Institute of Precision Engineering CUHK Hong Kong

In plastic injection molding, the ram position plays an important role in production quality. This paper introduces a new method, which is a combination of the current cycle feedback control (a PI controller) and a feed-forward higher-order iterative learning control (ILC), to control the ram position in injection molding. The PI controller is used to stabilize the system, and the feed-forward higher-order ILC control is used to compensate for nonlinear/unknown dynamics and disturbances, thereby gaining the precision tracking to ram position. The simulation results indicate that the new method outperforms the conventional PI controller. In addition, it outperforms the conventional ILC in the convergence performance.

关键词： Plastic injection molding iterative learning control ram velocity

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Parameter optimization of wireless communication system in video surveillance network

Parameter optimization of wireless communication system in v...

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ICIA 2005: 2005 International Conference on Information Acquisition

作者： Shi, Xi Hu, Jianming Song, Jingyan Xu, Yangsheng Department of Automation and Computer-aided Engineering Chinese University of Hong Kong Shatin Hong Kong Department of Automation Tsinghua University Beijing 100084 China College of Computer Science and Engineering Guizhou University Guiyang 550025 China

ISBN: (纸本)0780393031

Aiming at the more and more serious traffic problem in large cities, this paper proposes a new architecture of urban traffic surveillance system based on the concept of sensor network. Since the speed and quality of communication system has a critical effect on the performance of the overall system, the optimal combination of duty cycle, one of the most important parameters, is introduced to optimize the system performance. This paper puts forward a duty cycle optimization model based on calculating n-times reachable matrix. Now that the parameter optimization model can be boiled down to a NP-hard problem, an improved genetic algorithm is introduced to solve the problem. The computational procedure and efficiency are discussed, and simulation study based on a practical road network is given to illustrate the validity of the proposed method. © 2005 IEEE.

关键词： Wireless telecommunication systems

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Global adaptive robust servo mechanism of lower triangular systems via nonlinear internal model 6

Global adaptive robust servo mechanism of lower triangular s...

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6th IFAC Symposium on Nonlinear Control Systems, NOLCOS 2004

作者： Chen, Zhiyong Huang, Jie Dept. of Automation and Computer-Aided Engineering Chinese University of Hong Kong Shatin N. T. Hong Kong

The global robust servomechanistrl problem (alternatively, global robust output regulation problem) for lower triangular systems has been studied for two special cases. The first case assumes that the systems only contain polynomial nonlinearities, and the second case limits the exogenous signals and the unknown parameters to be within a known bounded set. This paper presents the solvability conditions of the global robust servomechanism problem for the lower triangular systems for the most general case where neither of the above two assumptions is needed. Copyright © 2004 IFAC.

关键词： Robust control

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Implicit fitting and smoothing using radial basis functions with partition of unity

Implicit fitting and smoothing using radial basis functions ...

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9th International Conference on computer aided Design and computer Graphics, CAD/CG 2005

作者： Xiaojun, Wu Michael, Yu Wang, Qi Xia Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong Shatin NT Hong Kong Department of Automation and Mechatronics Harbin Institute of Technology Shenzhen Graduate School

ISBN: (纸本)0769524737

A new scheme for 3D reconstruction of implicit surfaces from large scattered point sets based on the radial basis functions (RBFs) is proposed in this paper. The partition of unity (POU) method and a binary tree is used to organize the point sets into some overlapping local subdomains and reconstructing a local surface for each of the subdomains from non-disjunct subsets of the points, we use only a single point at the offset of the surface to avoid the trivial solution of RBF linear system. When the offset point is chosen properly, the technique is not only efficient but also robust, offering a higher level of scalability. The global solution can be obtained by combining the local solutions with POU equations. We also adapt the methodology of level set propagation of a dynamic surface and employ it for smoothing the reconstructed surfaces. We develop versatile computational framework with many benefits in topological flexibility and numerical efficiency. © 2005 IEEE.

关键词： computer graphics

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Transmission of multimedia information on micro environment via Internet

Transmission of multimedia information on micro environment ...

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作者： Lai, King W. C. Fung, Carmen K. M. Li, Wen J. Elhajj, Imad Xi, Ning Dept. of Automation and Computer-Aided Engineering Chinese University of Hong Kong Hong Kong Hong Kong Dept. of Electrical and Computer Engineering Michigan State University United States

Recent developments in the Internet have significantly increased the human capability to obtain information from and reach remote locations. In parallel, the Micro Mechanical and Electronic Systems (MEMS or Microsystems) technology makes it possible for the human to sense and act in a microenvironment. Combined, the Internet and MEMS, will produce a new technology for humans to sense and act in a remote micro-environment. This new technology has potential impact on several fields one of which is biomedical engineering. In this paper, we will present our ongoing development of polyvinylidence fluoride (PVDF) micro-tips as rateof-force sensors for tele-micromanipulation forcefeedback control of micro-mechanical devices over the Internet. Internet based teleoperation between Hong Kong and Michigan State was demonstrated using an event-based control scheme, which ensured stability and synchronization. Control was enhanced by multimedia feedback, which included, in addition to the traditional video, force feedback. The force fed back augmented the limited information supplied by visual feedback. However, the use of force feedback for microenvironments has difficulties, such as proper scaling, that should be carefully studied. We believe this project will eventually make a great impact to the globalisation of MEMS foundries because it will allow global users to micro-assemble and manipulate surface micromachined devices from their laboratories, and hence, reduce the time from design to production significantly. © 2000 IEEE.

关键词： Feedback

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Experimental implementations of adaptive self-organizing fuzzy slide mode control to a 3-DOF rehabilitation robot

Experimental implementations of adaptive self-organizing fuz...

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3rd International Conference on Innovative Computing Information and Control, ICICIC'08

作者： Chang, Ming-Kun Yuan, Tsan-Hsiu Department of Mechanical and Computer-Aided Engineering St. John's University Institute of Automation and Mechatronics St. John's University

ISBN: (纸本)9780769531618

Pneumatic muscle actuator has many advantages such as high power/weight ratio, high power/volume ratio, low price, little maintenance needed, great compliance, and inherent safety. Therefore, it can be suitably applied to rehabilitation engineering for persons with neuromuscular or musculoskeletal pathologies affecting extremity functions. However, excellent control performance can hardly be achieved by classical control methods because gas compression and nonlinear elasticity of bladder containers cause parameter variations. An adaptive self-organizing fuzzy sliding mode control (ASOFSMC) is developed in this study to improve control performance. Experimental results show that this control strategy can achieve excellent control performance. © 2008 IEEE.

关键词： Sliding mode control

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Fuzzy logic decision fusion in a multimodal biometric system 8

Fuzzy logic decision fusion in a multimodal biometric system

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8th International Conference on Spoken Language Processing, ICSLP 2004

作者： Lau, Chun Wai Ma, Bin Meng, Helen M. Moon, Y.S. Yam, Yeung Human-Computer Communications Laboratory Department of Systems Engineering and Engineering Management Hong Kong Department of Computer Science and Engineering Hong Kong Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong Hong Kong Hong Kong

This paper presents a multi-biometric verification system that combines speaker verification, fingerprint verification with face identification. Their respective equal error rates (EER) are 4.3%, 5.1% and the range of (5.1% to 11.5%) for matched conditions in facial image capture. Fusion of the three by majority voting gave a relative improvement of 48% over speaker verification (i.e. the best-performing biometric). Fusion by weighted average scores produced a further relative improvement of 52%. We propose the use of fuzzy logic decision fusion, in order to account for external conditions that affect verification performance. Examples include recording conditions of utterances for speaker verification, lighting and facial expressions in face identification and finger placement and pressure for fingerprint verification. The fuzzy logic framework incorporates some external factors relating to face and fingerprint verification and achieved an additional improvement of 19%.

关键词： Fuzzy logic

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Diagnosis of sheet metal stamping processes based on thermal energy distribution

Diagnosis of sheet metal stamping processes based on thermal...

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2005 IEEE Conference on automation Science and engineering, IEEE-CASE 2005

作者： Ng, Yiu-Ming Harry Yu, Maolin Huang, Y. Du, R. E-manufacturing Laboratory Dept. of Automation and Computer-Aided Engineering Chinese University of Hong Kong Shatín NT Hong Kong

ISBN: (纸本)0780394267

computer-Aid Design (CAD) and Finite Element Analysis (FEA) have been widely used in sheet metal stamping nowadays, especially in automotive and aerospace industries. However, die tryout and fault diagnosis still heavily rely on the experiences of the machinists on the shop floor. In this paper, a novel approach is proposed using the thermal energy distribution of the part. The new approach is based on the fact that during the stamping process, the part absorbs energy to deform. Since most of the (plastic) deformation energy would convert to heat energy, it is therefore possible to detect possible defects by means of analyzing its thermal energy distribution. In practice, the thermal energy distribution can be acquired using an infrared camera. Furthermore, it is possible to compute the thermal energy distribution through a simple FEA. A practical example of cup drawing is discussed in details together with the experiment validation. © 2005 IEEE.

关键词： Stamping

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Associative memories based on discrete-time cellular neural networks with one-dimensional space-invariant templates

Associative memories based on discrete-time cellular neural ...

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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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