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A Solution to Shape Optimization Problems for the Rigidity Design of Plate and Shell Structures

A Solution to Shape Optimization Problems for the Rigidity D...

The Sixth World Congress on Computational Mechanics in Conjunction with the Second Asian-Pacific Congress on Computational MechanicsⅠ

作者： Masatoshi Shimoda Jiro Tsuji Yasuhiro Kanda Hisayuki Ishizu Hideyuki Azegami Department of Mechanical Design Engineering Shonan Institute of Technology 1-1-25 Tsujido-nishikaigan Fujisawa 251-8511 Japan Development Planning Department Mitsubishi Automotive Engineering Co. Ltd. 1 Nakashinkiri Hashime-cho Okazaki -444-8501 Japan Okazakilst System Department MMC Computer Research Ltd. 1 Nakashinkiri Hashime-cho Okazaki 444-8501 Japan Digital Technology Dept. Mitsubishi Motors Corp. Hashime-cho Okazaki 444-8501 Japan Dept. of Complex Systems Science Nagoya University Chigusa-ku Nagoya 464-8601 Japan

Plate and shell structures are widelyused in industrial products and structures such as automotives, vessels and architectures for its good formability and lightweight property. This paper presents a numerical shape optimization method for the rigidity design of plate and shell structures. A solution to a compliance minimization problem subject to a volume constraint is proposed, and its reciprocal problem is also solved. The boundaries are assumed to be movable in the in -plane directions so as to keep the initial curvatures in the design domain. For simplicity, the structures to be optimized are discretized by plane elements based on the Mindlin-Reissner plate theory. The problems are formulated as non-parametric, or distributed shape optimization problems involving the design of free boundaries. The shape gradient functions are theoretically derived using the material derivative method and the Lagrange multiplier method. With the shape gradient function, the smooth domain variation that minimizes the objective functional is de termined by the traction method developed by the authors. The validity and practical utility of this numerical solution for the rigidity design of plate and shell structures are verified through simple examples and applications to automotive components.

关键词： Shell A Solution to Shape Optimization Problems for the Rigidity Design of Plate and Shell Structures Shape

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40th EASD Annual Meeting of the European Association for the Study of Diabetes : Munich, Germany, 5-9 September 2004

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Diabetologia 2004年第SUPPL 1期47卷 A1-A464页

作者： Veitenhansl, M. Stegner, K. Hierl, F.-X. Dieterle, C. Feldmeier, H. Gutt, B. Landgraf, R. Garrow, A. P. Vileikyte, L. Findlow, A. Waterman, C. Boulton, A. J. M. Shankhdhar, K. Shankhdhar, L. Shankhdhar, U. Petrova, N. L. Foster, A. V. M. Edmonds, M. E. Ferraresi, R. Caravaggi, C. De Giglio, R. Cavaiani, P. Pogliaghi, I. Sommariva, E. Katz, I. A. Harlan, A. Miranda-Palma, B. Prieto-Sanchez, L. Armstrong, D. G. Bowker, J. H. Mizel, M. S. Cernea, S. Wohlgelernter, J. Kidron, M. Modi, P. Raz, I. Arbit, E. Nosek, L. Kapitza, C. Beckett, P. Gelfand, R. Goldberg, M. Heise, T. Testa, M. A. Turner, R. R. Hayes, J. F. Scranton, R. E. Simonson, D. C. Yang, Y.-W. Hsu, Y.-J. Naujok, O. Francini, F. Jörns, A. Tiedge, M. Lenzen, S. Abdel-Wahab, Y. H. A. Marenah, L. Orr, D. F. Shaw, C. Flatt, P. R. Chokkalingam, K. Mansell, P. I. Clausen, P. Ekbom, P. Damm, P. Feldt-Rasmussen, U. Nielsen, B. Mathiesen, E. R. Feldt-Rasmussen, B. Dewan, S. Da Silva, N. Ternan, P. Mc Leong, K. S. Wilding, J. P. H. Asatiani, N. Kurashvili, R. Dundua, M. Shelestova, E. Pagava, K. Ramazashvili, M. Hod, M. Smirnov, S. Petersen, J. L. A. Justesen, T. I. Ringholm Nielsen, L. Müller, C. Højlund, K. Wensaas, A. Kase, E. T. Aas, V. Rustan, A. C. Thoresen, G. H. Levin, K. Beck-Nielsen, H. Gaster, M. Im, S.-S. Kang, S.-Y. Kim, S.-Y. Ahn, Y.-H. Lihn, A. S. Schmoll, D. Werner, T. Kienitz, A. Meyer, M. Barthel, A. Ailett, F. Sutherland, C. Walther, R. Grempler, R. Sasson, S. Reich, R. Tenenbaum, T. Alpert, E. Anfossi, G. Russo, I. Traversa, M. Massucco, P. Mattiello, L. Doronzo, G. Trovati, M. Lally, S. Tan, C. Y. Owens, D. Tomkin, G. H. Porchay, I. Péan, F. Bellili, N. Betoulle, D. Balkau, B. Tichet, J. Marre, M. Fumeron, F. Chatellier, G. Alhenc-Gelas, F. Nichols, G. A. Brown, J. B. Hayes, R. P. Bowman, L. Drexel, H. Saely, C. H. Marte, T. Benzer, W. Langer, P. Hoefle, G. Moll, W. Aczel, S. Karagiannis, E. Lübben, G. Urquhart, R. Edwards, G. Bruce, S. Howlett, H. S. C. Cugnardey, N. Turner, K. C. Park, J.-S. Fiedorek, F. T. Avogaro, A. Gallo, A. Pinton, P. Riz Innenstadt Klinikum der Universität München München Germany Diabetes Center Medizinische Klinik München Germany Medicine The University of Manchester Manchester UK Medicine University of Manchester Manchester UK Podiatry The University of Salford Manchester UK Department of Medicine/Division of Endocrinology Diabetes and Metabolism University of Miami Miami USA Department of Medicine Manchester Royal Infirmary Manchester UK Podiatry L.K.Diabetes Centre Lucknow India Diabetology L.K.Diabetes Centre Lucknow India Medical Nutrition L.K.Diabetes Centre Lucknow India Diabetic Foot Clinic King’s College Hospital London UK Haemodinamic Department - Cardiovascular Division Magenta Hospital Milan Italy Center for the Study and Treatment of Diabetic Foot Pathology Abbiategrasso Hospital Milan Italy Center for the Study and Treatment of Diabetic Foot Pathology Abbiategrasso Hospital Abbiategrasso Italy Department of Orthopedics University of Miami Miami USA Department of Surgery Southern Arizona Veterans Affairs Medical Center Tucson USA Surgery Southern Arizona VA Medical Center Tucson USA Podiatric Medicine and Surgery Rosalind Franklin University School of Medicine and Science North Chicago USA Diabetes Department Center of Diabetes Nutrition and Metabolic Disorders Clug-Napoca Romania Diabetes Unit Hadassah University Hospital Jerusalem Israel Diabetes Unit Hadassah Hebrew University Hospital Jerusalem Israel Research Department Generex Biotechnology Corporation Toronto Canada Hadassah Hebrew University Hospital Jerusalem Israel Medical Research Emisphere Technologies Inc. New York USA Profil Institut fuer Stoffwechselforschung GmbH Neuss Germany Profil Institute for Metabolic Research Neuss Germany Management Profil Inst. für Stoffwechselforschung Düsseldorf Germany Institute for Metabolic Research Profil Neuss Germany Biostatistics Harvard School of Public Health Boston USA Clinical Research Phase V Technologies Wellesley Hills US

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A BEHAVIOUR-BASED APPROACH TO REACTIVE NAVIGATION FOR AUTONOMOUS ROBOT

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IFAC Proceedings Volumes 2002年第1期35卷 109-114页

作者： D.Y. Yoon S.R. Oh G.T. Park B.J. You Dept. of Electrical Engineering Korea Univ. Intelligent System Control Research Center Korea Institute of Science and Technology(KIST): 39-1 Haweolgog-dong Seongbuk-gu Seoul Korea

This paper proposes a new effective behaviour-based reactive navigation methodology for autonomous mobile robot. Its main contribution is based on newly proposed egocentric 'homeostatic' approach by which behaviours are coordinated while taking advantages of both competitive and cooperative method. In order to accomplish autonomous navigation, direction and velocity are modulated automatically by single real value, ***'satisfaction level' without any central or additional module so that this method becomes simple, consistent, and flexible. The validities of the proposed methodology are shown by graphic simulation and experiments with wheeled mobile robot.

关键词： robot navigation robot programming mobile robots behaviour robotics

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Speed-Sensorless control Using Elman Neural Network

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Journal of systems Engineering and Electronics 2001年第4期12卷 53-58页

作者：谢庆国万淑芸易燕春赵金沈轶 Dept. of Control Science & Technology Huazhong University of Science and Technology Wuhan 430074 P. R. China Dept. of System Changtong Corp. Wuhan 430072 P. R. China

This paper describes a modified speed-sensorless control for induction motor (IM) based on space vector pulse width modulation and neural network. An Elman ANN method to identify the IM speed is proposed, with IM parameters employed as associated elements. The BP algorithm is used to provide an adaptive estimation of the motor speed. The effectiveness of the proposed method is verified by simulation results. The implementation on TMS320F240 fixed DSP is provided.

关键词： Algorithms Computer simulation Digital signal processing Induction motors Neural networks Pulse width modulation

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High-speed wall following and obstacle avoidance of wheeled mobile robots using hybrid behavior specifications

High-speed wall following and obstacle avoidance of wheeled ...

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IEEE International Symposium on Computational Intelligence in Robotics and Automation

作者： Lim, MS Lim, JH Oh, SR Dept. of Mechatronics Kyonggi Institute of Technology South Korea Intelligent System Control Research Center Korea Institute of Science and Technology South Korea Dept. of Electronic Engineering Hanyang University South Korea

ISBN: (纸本)0780372034

In this paper, we propose a new approach to the high-speed wall following of wheeled mobile robots using hybrid control system. The proposed hybrid system consists of the discrete state system as the high-level process and the continuous state system as the low-level process. In discrete state system, the discrete states are defined by the user-defined constraints and the reference motion commands are specified in the abstracted motions. The reference motion commands are translated into the control inputs for each wheel in the continuous state system. The hybrid control system applied for wheeled mobile robots can combine the motion planning and autonomous navigation with obstacle avoidance in indoor navigation problem. Simulation results show that hybrid system approach is an effective method for the autonomous navigation. In the experiments of the indoor environments, we proved that the performance of the high-speed navigation is excellent.

关键词： Mobile robots

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High Speed Indoor Navigation of Mobile Robots Using Hybrid Dynamic control Approach

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IFAC Proceedings Volumes 2001年第4期34卷 257-262页

作者： Mee-Seub Lim Sang-Rok Oh Joonhong Lim Dept. of Mechatronics Kyonggi Institute of Technology Intelligent System Control Research Center Korea Institute of Science and Technology Department of Electronic Engineering Hanyang University

In this paper, we propose a new approach to the high-speed navigation of the indoor environments for wheeled mobile robots using hybrid dynamic control approach. The proposed hybrid system consists of the discrete state system as the high-level process and the continuous state system as the low-level process. In discrete state system, the di crete states are defined by the user-defined constraints and the abstracted motions specify the reference motion commands of mobile robots. The experimental results show that hybrid system approach is an effective method for the autonomous navigation and highspeed maneuvering.

关键词： Mobile Robot High-Speed Indoor Navigation Hybrid Dynamic control

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Speed-Sensorless control Using Elman Neural Network

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Journal of systems Engineering and Electronics 2001年第4期000卷

作者： XIE Qingguo Wan Shuyun Yi Yanchun Zhao Jin Shen Yi Dept. of Control Science & Technology， Huazhong University of Science and Technology， Wuhan 430074，P. R. China Dept. of System， Changtong Corp.， Wuhan 430072， P. R. China Dept. of Control Science & Technology， Huazhong University of Science and Technology， Wuhan 430074， P. R. China

This paper describes a modified speed-sensorless control for induction motor (IM) based on space vector pulse width modulation and neural network. An Elman ANN method to identify the IM speed is proposed,with IM parameters employed as associated elements. The BP algorithm is used to provide an adaptive estimation of the motor speed. The effectiveness of the proposed method is verified by simulation results. The implementation on TMS320F240 fixed DSP is provided.

关键词： Induction motot Speed-sensorless Field orientated control Elman neural network Digital signal processor

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An improved ZVS partial series resonant DC/DC converter with low conduction losses

An improved ZVS partial series resonant DC/DC converter with...

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作者： Lee, Dong-Yun Kim, Eui-Sung Hyun, Dong-Seok Choy, Ick Dept. of Electrical Engineering Hanyang University 17 Haengdang-dong Seongdong-ku Seoul133-791 Korea Republic of Intelligent System Control Research Center Korea Institute Science and Technology Korea Republic of

This paper presents an improved ZVS partial series resonant DC/DC converter (PSRC) with low conduction losses, suitable for high power and high frequency application. The proposed PSRC has advantages of zero-voltage-switching (ZVS) of the main switches for entire load ranges and low conduction losses of the main switches by decreasing current stresses. Also, reduction of the effective duty cycle does not occur during resonant period of the main circuit because the auxiliary circuit of the proposed converter is placed out of the main power path. The auxiliary network is only composed of passive components including the auxiliary inductor, auxiliary capacitors, auxiliary diodes and saturable inductor. Therefore, an improved ZVS PSRC has improved characteristics with respect to the overall system efficiency. The operation principles of the proposed converter are explained in detail and the validity of the proposed converter is verified by several interesting simulated and experimental results. © 2000 IEEE.

关键词： Zero voltage switching

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Algorithm for Three-Step Estimation of Transfer Function with Unknown Delay Steps and Order

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IFAC Proceedings Volumes 2000年第15期33卷 373-378页

作者： Mitsuki Mashino Fujio Ohkawa Kazushi Nakano Masayoshi Tomizuka Mechanics & Electronics Research Institute Fvkuoka Industrial Technology Center 3-6-1 Norimatsu Yahatanishi-ku Kitakyushu 807-0831 JAPAN Dept. of Control Engineering and Science Faculty of Computer & System Engineering Kyushu Institute of Technology Kawazu Iizuka 820-8502 JAPAN Dept. of Electronic Engineering The University of Electro- Communicatons 1-5-1 Chofu-ga-oka Chofu Tokyo 182-8585 JAPAN Dept. of Mechanical Engineering University of California at Berkeley 5100 B Etcheverry Hall Berkeley CA 94720-1740 USA

This paper deals with the estimation of an unknown process transfer function in the presence of colored measurement noise. A three-step estimation procedure has been previously developed for transfer functions, the delay steps and the orders of which are known in advance. The procedure is extended to deal with transfer functions with unknown delay steps and orders. The auto-correlation function of the error between the process output and model output is utilized for evaluating the model fitness. The effectiveness of the proposed method is demonstrated by a simulation study using a sample set of data in MATLAB.

关键词： colored noise I/O correlation information BCLS estimates parameter transformation MSE

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Speech recognition using stochastic phonemic segment model based on phoneme segmentation

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systems and Computers in Japan 2000年第10期31卷 89-98页

作者： Furuichi, Chieko Aizawa, Katsura Inoue, Kazuhiko Faculty of Engineering Toin University of Yokohama 1614 Kurogane Midori Yokohama 225-8502 Japan Department of Physics Faculty of Science Ochanomizu Women's University Res. Lab. of Precision Engineering Tokyo Institute of Technology Dept. of Control System Engineering Faculty of Engineering Toin Yokohama University Acoustic Society of Japan Department of Control Systems Faculty of Engineering Toin Yokohama University

This paper discusses speech recognition based on a new statistical phoneme segment model which is trained by phoneme parameters derived from automatically extracted phoneme segments. The proposed system operates as follows. In preprocessing before recognition, the phoneme boundaries are detected by segmentation. The phonemes are discriminated using a stochastic phoneme segment model, and a phoneme segment lattice with scores is constructed. Next the speech recognition is performed by matching of symbol sequences to dictionary items. The segmentation system that is employed can infer phoneme boundaries with high accuracy. This helps to eliminate unnecessary parameters, leaving the feature parameters which are effective in separating phonemes. In other words, the phoneme recognition problem in continuous speech can be reduced to a discrimination problem and thus a speaker-independent model can be constructed from a relatively small number of training data. The stochastic phoneme segment model is trained with training samples extracted from a phoneme-balanced word set of 4920 words uttered by 10 speakers. In a recognition experiment with 6709 words uttered by 63 nontraining speakers, a recognition rate of 92.6% was obtained as the average for all speakers, using a word dictionary of 212 words.

关键词： Speech recognition

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