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International Conference on Signal Processing(ICSP’93)

作者： Masahichi KISHI Xiaohui YUAN Information Network Engineering AIT YagusaToyotaAichi470-03JAPAN Dept. of Automatic Control Southeast University

Signals transmitted over poor radio channels are interfered by fading noise to be degraded in speech *** short time DFT(ST DFT) compander has successfully excluded envelope detection owing tn(?)mploying concept of instantaneous spectrum instead of employing approximated AM demodulation in realizing the envelope *** ST DFT compander is able to reduce fading noise to improve speech quality over poor radio channels without any *** ST DFT compander is discussed in this paper to optimize their structures and is also discussed to be sufficient in noise reduction both from the -oretical analysis and computer simulations.

关键词： DFT Fading Noise Reduction Effect Through the Short Time DFT Compander

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Optimum pairing and ordering conditions for simultaneous reduction in total capacitance, sensitivity and output noise of cascade SC filters

Optimum pairing and ordering conditions for simultaneous red...

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1992 IEEE International Symposium on Circuits and systems, ISCAS 1992

作者： Zhiqiang, M.A. Nakayama, Kenji Yamamoto, Gaishi Department of Electrical and Computer Engineering Faculty of Technology Kanazawa University Kanazawa920 Japan Faculty of Engineering Kanazawa Institute of Technology Ishikawa921 Japan Dept. of Automatic Control Engineering Central-South University of Technology Changsha China

ISBN: (纸本)0780305930

This paper presents optimum pairing and ordering (P/O) conditions for simultaneous reduction in total capacitance, sensitivity and output noise of cascade SC filters. First, investigating relations among conditions proposed for minimizing these three parameters independently, termed, CTmin, Smin and Nmin conditions, we make it clear that there is no P/O assignment with which the three parameters can be simultaneously minimized. Then we verify that Nmin condition is valid in reducing two other parameters. Trade-off optimum conditions are proposed by combining Nmin with Smin and CTmin. These conditions can limit the number of P/O assignments, in which an optimum P/O assignment for simultaneous reduction of three parameters can be searched out easily. Depending upon applications, the trade-off optimum condition can be slightly modified by adjusting the proportion of CTmin Smin and Nmin. Efficiency of the proposed trade-off optimum conditions is confirmed through computer simulation using several kinds of filters. © 1992 IEEE.

关键词： Capacitance

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Simulation environment for an autonomous and decentralized multi-agent robotic system

Simulation environment for an autonomous and decentralized m...

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1992 IEEE/RSJ International Conference on Intelligent Robots and systems, IROS 1992

作者： Habib, Maki K. Asama, Hajime Ishida, Yoshiki Matsumoto, Akihiro Endo, Isao Control and System Eng. Dept. University of Technology Baghdad Iraq Institute of Physical and Chemical Research Chemical Engineering Lab. Hirosawa 2-1 Wako-shi Saitama351-01 Japan Information Network System Operation Center University of Tokyo Japan Dept. of Mechanical Engineering Faculty of Engineering Toyo University Japan

ISBN: (纸本)0780307372

An autonomous and decentralized system called ACTRESS (ACTor based Robot and Equipment Synthetic system) is being under development as an intelligent robot system which can execute high level tasks. ACTRESS is composed of multiple robotic agents. Each robotic agent is called "robotor". A robotor may be a robot, a computing system and any other equipments. While researching in this field, many research issues need to have solutions, such issues may include, the communication among the agents and protocols, cooperation among a group of' agents, describing the tasks to be executed, multi-agent motion planning, multi-agent task planning, task description, human interface role, solv ing deadlocks ... etc. The aim or this paper Ls to develop a simulation environment for an autonomous and decentralized multi-agent robotic system. For this purpose, it is necessary to simulate and analyze the main functions of each agent, design and analysis of the actions to be carried out by each agent, analyzing their real time behavior with a variety of situations considering their environment and the treatment of unexpected events. Also, it is necessary to find out an efficient strategy to realize effective means for the agents to form a cooperating manner that support task execution and problem solving. In parallel with the mentioned purposes the ACTRESS structure is simulated as functions and behavior using the developed simulation environment. This simulation includes a roup of mobile robots, human interface and global environment manager. Then, software integration that deal with various aspect of the overall problem is developed. Different experiments are performed to analyze the performance or each individual robotor and the overall system. © 1992 IEEE. All rights reserved.

关键词： Intelligent robots

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Voting Software for Fault-Tolerant Aircraft Flight control systems

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IFAC Proceedings Volumes 1992年第20期25卷 87-92页

作者： Julian M. Bass Peter J. Fleming Dept. of Automatic Control and Systems Engineering University of Sheffield P.O. Box 600 Mappin Street Sheffield SI 4DU U.K.

An intelligent and robust voting service is proposed. The novel voting service, is capable of forming a consensus based on performance of redundant applications in the value, time and reliability *** voter is distributed using a hot backup approach to ensure timely recovery in the event of voter failure. Specification diversity is advocated in order to improve upon the effectiveness of design diversity. The voter is designed to be a system building block, embedded in a framework of design tools which will allow the developer to express control concepts, such as deadlines, priorities, re-plication and voting.

关键词： Real-Time systems Distributed systems Fault-Tolerance Voting Software Fault-Tolerance

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Harmonic insertion in PWM inverter drive schemes

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European Transactions on Electrical Power 1992年第3期2卷 143-151页

作者： Theocharis, J. Petridis, V. Dr.-Ing. John Theocharis (1956) graduated as an Electrical Engineer from Aristotelian University of Thessaloniki.Greece in 1980. From 1980 to 1985 he has been with the scientific staff of the Department of Electrical Engineering at the Aristotelian University where he received the Ph.D. degree in 1985. Since 1986 he is working as a lecturer and in 1990 he became assistant professor at the Department of Electronics and Computer Engineering in the m e university. His research activities include control power electronics and electrical motor drives. Recently he is working with the Neural Network Systems with applications to field oriented control problems. Aristotelian University of Thessaloniki School of Engineering Faculty of Electrical Engineering Dept. of Electronics & Computer Engineering P.O. Box 438 GR-Thessalonikil/Greece.T+3131/219784Fax + 3031/274868) Prof. Dr.-Ing. Vasilis Petridis (1946) graduated from National Technical University of Athens Greece in 1969.He obtained the M.Sc. and the Ph.D. in electronics and systems from the University of London in 1970 and 1974. respectively. H i s interests include applied automatic control neural networks drives dynamic systems robotics etc. He is currently professor in the Department of Electronics and Computer Engineering of the University of Thessaloniki. (Aristotelian University of Thessaloniki. School of EngineeringFaculty of Electrical Engineering Dept. of Electronics & Computer Engineering P.O. Box 438. GR-ThessaloniW Greece T+3031/219784.Fax+3031/274868)

The procedure of harmonic insertion is generalized in this paper. Analytical expressions of the voltage spectra are derived. The insertion of the 3rd harmonic to the modulating signal, which is of particular interest, is considered as a special case. It is demonstrated in this case that the fundamental harmonic component of the phase and the line‐to‐line voltage is not affected by the insertion of the 3rd harmonic for sufficiently high values of the chopping ratio. However it has been shown that the higher harmonic spectrum is significantly improved as compared to the case of pure sinusoidal modulation. For different values of the fundamental component the optimal values of the amplitude of the third harmonic to be inserted have been calculated so that the distortion factor of the higher harmonic spectrum is minimized. Other cases of harmonic insertion are also considered which provide spectrum efficiency improvement. Experimental results are given which have been obtained by means of a microcomputer controlled PWM generator constructed for this purpose. Copyright © 1992 John Wiley & Sons, Ltd.

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Enhanced Robustness for Pitch Pointing Flight Using Sliding Mode control

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IFAC Proceedings Volumes 1991年第1期24卷 369-374页

作者： M.E. Penati G. Bertoni C. Chen Electronics Computer Science and System Theory Dept. University of Bologna Viale Risorgimento 2 40136 Bologna Italy Dept. of Automatic Control Nanjing Aeronautical Institute Nanjing PRC

This paper proposes a methodology of combining eigenstructure assignment, feedforward gain with sliding mode control technique to realize an enhanced robust pitch pointing flight control system. This control system can track step input commands without error and it turns out to be consistently robust against parameter variations and external disturbances. The design methodology is illustrated by application to an AFTI/F-16 aircraft.

关键词： C.C.V. (A.C.T.) V.S.S. Sliding Mode Decoupling Robustness

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A practical application of a numerical optimization technique in the feedmill industry

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engineering Optimization 1991年第1-3期18卷 107-120页

作者： Ramon, H. Vingerhoeds, R.A. Netten, B.D. Noldus, E. Catholic University of Louvain Dept. of Agricultural Engineering Leuven Kardinaal 3030 Mercierlaan 92 Belgium State University of Ghent Automatic Control Laboratory 9710 Gent - Zwijnaarde Grotesteenweg Noord 2 Belgium

The cow model of Meijer describes a mathematical relation between the predicted daily milk production and the corresponding feed intake needed for lactating cows. The milk production is a function of several parameters defined for each cow. Used in least cost calculations of daily rations, an optimization problem is obtained, which consists of one highly non-linear equality constraint, together with several linear inequality constraints. Their number required in the optimization can vary and depends on the user’s choice. The cost function itself gives a linear relation between the prices of the different forages mixed in the optimal blend. The optimization result has been implemented with the aid of Augmented Lagrange Functions with a view to apply the program in the feedmill industry. © 1991, Taylor & Francis Group, LLC. All Rights Reserved.

关键词： augmented Lagrange method cow-model of Meijer Numerical optimization quasi-Newton method

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Nissan's new "high-drivability" vibration control system

Nissan's new "high-drivability" vibration control system

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作者： Abe, Toshiro Fujiwara, Yasuhiko Minami, Hideki Hashimoto, Atsunori Atago, Takeshi Nakazawa, Shinsuke ESTECH Corp. Japan Simultaneous Engineering Center Nissan Motor Co. Ltd. Japan Chassis Experiment Dept. Chassis Experiment Section Nissan Motor Co. Ltd. Japan Engine Experiment Dept. Pert. Experiment Section Nissan Motor Co. Ltd. Japan Sawa Works Powertrain Control System Design Dept. Hitachi Ltd. Japan Engine Design Dept. Nissan Motor Co. Ltd. Japan

Attenuation of fore and after vehicle vibration caused by transient throttle pedal maneuvering is a key factor in achieving a good drivability. The dynamics of this vibration is analyzed considering torque generated by combustion as the exciting force. The relationship between vibration attenuation and improvement of drivability is determined using a subjective, low frequency vibration test. Through these analyses and tests, a new vibration control system is developed which controls the above noted torque by providing optimum adjustment of ignition timing. Decreasing fore and after vehicle vibration without adversely affecting vehicle performance, this control system improves drivability in both FF and FR cars by more than 1.0 evaluation point.

关键词： Vehicle performance

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The nippondenso electronic control system for the diesel engine

The nippondenso electronic control system for the diesel eng...

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International Congress and Exposition

作者： Murayama, Fumiaki Tanaka, Yasushi Ito, Shigehiko Engine Control System Engineering Dept. Nippondenso Co. Ltd. Japan Electronics Engineering Dept. Nippondenso Co. Ltd. Japan

This paper describes the methods of operation and functions of advanced fuel injection controls, and the results of engine testing for the "Learning control", a function which was developed to control diesel engines that makes the most of the flexibility found in software used for electronic control. In-dept. of study of the "Learning control" function, confirms that this function can provide stability in engine performance by automatic compensating for injection quantity deviation in fuel injection pump operation. This paper also outlines concepts for insuring the safety of system operation during the "Learning control" stage. Copyright © 1988 Society of Automotive Engineers, Inc.

关键词： Diesel engines

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An improved SSDA applied in target tracking

An improved SSDA applied in target tracking

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International Conference on Pattern Recognition

作者： H. Zhenhua Z. Peiying Dept. of Autom. Control Eng. Nanjing Inst. of Technol. China Department of Automatic Control Engineering Nanjing Institute of Technology China

An improved SSDA (sequential similarity detection algorithm), which may be used to determine similarity in a more efficient manner than the SSDA currently in use, is introduced. The algorithm saves computation time and improves performance compared to the current SSDA. The problem of target tracking, used as an example, and calculation of performance indexes of SSDA are introduced to optimally implement the algorithm. Two series of frame images are simulated from real data to demonstrate the efficiency of the improved SSDA for target tracking.< >

关键词： Target tracking Pixel Image sensors Random number generation Costs Autocorrelation Linear approximation Electrical capacitance tomography Hardware White noise

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