检索结果-内蒙古大学图书馆

control of PWM AC‐to‐DC converters using state‐space and fuzzy‐methods

European Transactions on Electrical Power 1995年第5期5卷 301-306页

作者： Krebs, S. Oelert, K. Dr.-Ing. Stephan Krebs (1963) received his Diploma degree in 1990 and his Dr.-Ing. degree in 1994 from the Elektrotechnisches Institut Universitat Karlsruhe/Germany. His main fields of interest are the use of modern time-discrete control methods and parallel signal processing in adjusrable speed drive and power supply systems. In summer 1994. he joined the Power Group of the Department of Electrical and Computer Engineering of the University of Toronto/Canada where he is currently working on industrial controller platform for power applications. (Department of Electrical and Computer Engineering University of Toronto 10 King's College Rd. TorontoiOntario. Canada M5S 1A4 T+416/978-66 18 Fax +416/971-2325) Kai Oelert (1967) received the Electrical Engineering degree from the Elektrotechnisches Institut of the University of KarlsruhdGermany in 1993. He is currently developing software for automatic ticket-wending systems with the Company Scheidt & Bachmann Monchengladbach/Germany. (Scheidt & Bachmann GmbH Breite Str. 132 D-4 1238 Monchengladbach/Germany T+2166/266445 Fax+2166/2666 15)

Adjustable speed drive systems using AC‐machines are often fed by voltage‐source inverters. This paper presents a new strategy to control the line‐side converter. State‐space and fuzzy methods are combined to achieve a control system which includes control limits and the aspects of safety. Experiments with a drive system (30 kW) demonstrate the dynamic and steady‐state behaviour of the control. Copyright © 1995 John Wiley & Sons, Ltd.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Three domain voting in real-time distributed control systems 2

Three domain voting in real-time distributed control systems

引用

2nd Euromicro Workshop on Parallel and Distributed Processing, PDP 1994

作者： Bass, Julian M. Croll, Peter R. Fleming, Peter J. Woolliscroft, Les J.C. Department of Automatic Control and Systems Engineering University of Sheffield P. O. Box 600 Mappin Street SheffieldS1 4DU United Kingdom Department of Computer Science University of Sheffield United Kingdom

ISBN: (纸本)0818653701

An intelligent and robust voting service for real-time distributed control systems is proposed. Three novel features of the voter are described. Firstly, the voter is distributed using a primary site algorithm. This algorithm is used to coordinate the voter elements ensuring service is provided even in the presence of single faults. Secondly, the voter is capable of selecting a correct result in certain cases of disagreement. This is achieved by monitoring the temporal behaviour and reliability of the application modules in addition to the comparison of numerical result values, an approach called Three Domain Voting. Thirdly, inclusion of a voting service in a Framework of tools for the design of real-time distributed control software is discussed. The Framework allows control engineers to specify their problem in a familiar application specific manner. The tools then provide a highly transparent transformation to an executable implementation. © 1994 IEEE.

关键词： Fault tolerance

来源：评论

学校读者我要写书评

暂无评论

A prototype framework of design tools for computer-aided control engineering

A prototype framework of design tools for computer-aided con...

引用

IEEE International Symposium on computer Aided control System Design (CACSD)

作者： A.R. Browne J.M. Bass P.R. Croll P.J. Fleming Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK Department of Computer Science University of Sheffield Sheffield UK

This paper introduces a framework of tools which allow the design of distributed, potentially fault-tolerant, real-time control software. This framework takes a system specified in the control engineering domain and translates this application-oriented representation into a software engineering representation. From this new representation, automatic code generation tools have been developed to create a complete, executable control system implementation.< >

关键词： Prototypes control engineering computing control engineering control systems Design engineering computer aided software engineering Software engineering Software tools automatic generation control Real time systems

来源：评论

学校读者我要写书评

暂无评论

On the Computation of the Maximal Corank of a Covariance Matrix Under the Frisch Scheme

引用

IFAC Proceedings Volumes 1994年第8期27卷 1133-1135页

作者： R.P. Guidorzi A. Stoian University of Bologna Dept. of Electronics Systems and Computer Science Bologna Italy Polytechnic Institute of Bucharest Department of Automatic Control Bucharest Romania

A simple algorithm for establishing the presence of points common to some singularity (hyper)surfaces associated to covariance matrices is developed. It allows, on the basis of the new algebraic and geometric properties recently given by Guidorzi (1994), the computation of the maximal number of linear relations that can be associated to a given set of data.

关键词： Linear algebra Frisch scheme system identification parameter estimation linear systems

来源：评论

学校读者我要写书评

暂无评论

PARSIM: a parallel optimization tool

PARSIM: a parallel optimization tool

引用

IEEE International Symposium on computer Aided control System Design (CACSD)

作者： A.J. Chipperfield P.J. Fleming T.P. Crummey Department Automatic Control and Systems Engineering University of Sheffield Sheffield UK School of Electronic Engineering and Computer Systems University of Wales Gwynedd UK

Current computer aided control system design environments seldom support optimization methods for controller design in a truly interactive manner. A prototype tool, called PARSIM, supporting parallel processing, optimization and a graphical user interface is presented addressing many of the problems inherent in current approaches to multiobjective optimization based design methods. An XWindows interface is used to simplify problem formulation and control the optimization processes. Using a previously developed interface, the computational burden may be alleviated by parallel processing.< >

关键词： control systems Design methodology Parallel processing Design optimization Optimization methods Prototypes Graphical user interfaces Process control computer interfaces Concurrent computing

来源：评论

学校读者我要写书评

暂无评论

automatic Derivation of World Update Schemes 2

Automatic Derivation of World Update Schemes

引用

2nd International Conference on Artificial Intelligence Planning systems, AIPS 1994

作者： Downs, Joseph Reichgelt, Han Shadbolt, Nigel Department of Automatic Control and Systems Engineering University of Sheffield SheffieldSI 4DU United Kingdom Subdepartment of Computer Science Department of Mathematics University of the West Indies Kingston 7 Mona Jamaica Artificial Intelligence Group Department of Psychology University of Nottingham NottinghamNG7 2RD United Kingdom

ISBN: (纸本)0929280563

Al planning systems must be able to update their internal model of the domain in order to determine the effects of a possible action. The most widely used update method is the STRIPS operator. STRIPS operators are extremely effìcient. However, the use of STRIPS operators requires that one specify all the consequences of an action beforehand. This becomes almost impossible for complex domains. Work by Pednault (1989) and Wilkins (1988) overcomes the problems associated with ordinary STRIPS operators by enhancing them with context-dependent effects and demons respectively. In this paper we describe a modelling procedure which can incorporate both these features. Moreover, the update method is automatically derived from an axiomatisation of the domain in temporal calculus. This allows the system designer great flexibility in choosing the trade-off point between representational expressivity against computational speed. Copyright © 1994, AAAI (***). All rights reserved.

关键词： Economic and social effects

来源：评论

学校读者我要写书评

暂无评论

computer‐aided calculation of the steady‐state thermal performance characteristics of low‐voltage circuit breakers

引用

European Transactions on Electrical Power 1993年第5期3卷 347-352页

作者： Völker, F. Dr.-Ing. Frank Völker (1958) VDI studied mechanical engineering special subjects “powerengineering automatic control engineering and mechanical science” at the University-GH-Duisburg/Germany where he got his Dipl.-Ing. degree in 1984. From 1984 to 1990 he has been a scientific assistant at the department “Konstruktionslehre und Fördertechnik” special subject “computer simulation of the performance characteristics of driving systems” at the same University where he received his Dr.-Ing. degree in 1990. In 1990 he joined Klöckner-Moeller GmbH Bonn/Germany as research engineer at the department “Forschung”. Since 1992 he is manager of Energy Management Systems at this company. (Klöckner-Moeller GmbH Head Office Energy Management Systems Hein-Moeller-Str. 7-11 D-53115 Bonn T +49228/602 - 11 62 Fax +49228/602- 11 94)

A discrete thermal network is given as an equivalent circuit of the steady‐state thermal performance characteristics of circuit breakers. The immediate environment of the enclosure and the feeders of the unenclosed switching device are the boundaries of the equivalent circuit, which specifically models the central phase of a three‐phase circuit breaker. computer simulations make it possible to analyse the thermal system performance in rated service. Selected examples prove the high quality of the model and the efficiency of the described method of calculation. Copyright © 1993 John Wiley & Sons, Ltd.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Sufficient Conditions for the Robust Stability of systems with Multiaffine Parameter Dependence

引用

IFAC Proceedings Volumes 1992年第21期25卷 168-171页

作者： B.D.O. Anderson F.J. Kraus M. Mansour S. Dasgupta Department of Systems Engineering Research School of Physical Sciences and Engineering Australian National University GPO Box 4 Canberra ACT 2601 Australia. Automatic Control Laboratory ETH Zurich 8092 Zürich Switzerland Department of Electrical & Computer Engineering University of Iowa Iowa City lA 52242 USA.

A number of robust stability problems take the following form: A polynomial has real coefficients wvhich are multiaffine in real parameters that are confined to a box in parameter space. An efficient method is required for checking the stability of this set of polynomials. We present two sufficient conditions in this paper. They involve: checking certain properties at the corners and edges of the parameter space box.

关键词： Robust Stability Multiaffine Parameter Dependence

来源：评论

学校读者我要写书评

暂无评论

Harmonic insertion in PWM inverter drive schemes

引用

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A Fuzzy Inference Approach to Failure Diagnosis of Adaptive controlled systems

引用

IFAC Proceedings Volumes 1991年第3期24卷 657-662页

作者： K. Kumamaru S. Sagara A. Nakai T. Söderström Department of Control Systems Engineering Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Fukuoka Iizuka 820 Japan Department of Electrical Engineering Faculty of Engineering Kyushu University Fukuoka Hakozaki 812 Japan Department of Automatic Control and Systems Analysis Institute of Technology Uppsala University P.O. Box 27 Uppsala Sweden

An on-line scheme to failure diagnosis is proposed for dynamic systems under adaptive control, which is designed based on a direct approach to self-tuning regulator. Failure modes occurred in the system are assumed to be described by unexpected changes in physical parameters of the system. The parameter changes in the controlled system can effectively be detected by using Kullback Discrimination Information (KDI) as an index for model discrimination. In order to decide whether the detected system parameter change is caused by a failure or not, a fuzzy inference approach to failure decision is considered. Some appropriate membership functions which describe fuzzy events of failures are constructed to perform the fuzzy inference. In this way, useful knowledge about failure modes which is available from, e.g., experts can be introduced into the model- based diagnosis technique. Simulation studies of a second-order damped oscillator have been carried out to demonstrate the effectiveness of the method.

关键词： Adaptive control failure diagnosis fuzzy inference Kullback discrimination information parameter estimation

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：