摘要:

Dynamic systems have sometimes to be controlled in circumstances that are very inconvenient for classical control methods. In such cases, use of qualitative controllers seems to be a promising alternative, as they can be designed without having an exact mathematical model. A method for synthesizing control rules is presented, in which a probabilistic qualitative model is used together with a decision strategy that takes into account the results of qualitative simulation. As a case study, the problem of the inverted pendulum control is considered. By combining the model simulation lookahead and a decision criterion, an interesting phenomenon of ‘exaggerated simulation’ has emerged. Experimental results show that in certain cases, using an exaggerated force in the process of simulation considerably improves the performance of generated control rules. The exaggeration helps to detect some trends of the system's behaviour that would otherwise have remained hidden. Experiments and mathematical analysis show that the improvement due to the exaggeration is comparable to that achieved by a deeper lookahead in the state transition graph.

ISSN:0020-7721    

DOI:10.1080/00207729308949550

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

We propose a design method for finite-dimensional decentralized VS-MRAC of a class of large-scale non-linear interconnected distributed parameter systems with bounded input and output disturbances. Each equivalent control is approximated by each average control and the norm of the output error vector can be made asymptotically arbitrarily small without the ℳ-matrix condition, independently of the reference inputs and in spite of the presence of non-linear interconnections, unmodelled dynamics and disturbances. Furthermore, it is assured that all signals in the closed-loop system are globally ultimately uniformly bounded. Finally, we show the effectiveness of the proposed method by using a numerical example.

ISSN:0020-7721    

DOI:10.1080/00207729308949551

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

The objective of this study is to characterize the unstable zeros of discrete-time non-minimum-phase systems and to compensate the gain and phase errors induced by unstable zeros for tracking control. These two objectives are attempted via examining the frequency response of unstable zeros. The gain error and phase shift induced by unstable zeros are first presented. It is well known that they are undesirable and cannot be cancelled directly via the method of pole-zero cancellation. Through investigating the characteristics of unstable zeros, a systematic approach is then given to compensate the gain and phase errors induced by unstable zeros. Using this approach, both a simple tracking control method and a precision tracking control method are proposed. The design procedure is presented and the design formulae are given. Simulation results are presented to illustrate the effectiveness of the proposed methods.

ISSN:0020-7721    

DOI:10.1080/00207729308949552

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

We apply the modified extended Kalman filter to develop a learning algorithm for feedforward networks. The resulting algorithm improves the existing extended Kalman filter based scheme in both speed of convergence and accuracy of estimation.

ISSN:0020-7721    

DOI:10.1080/00207729308949553

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

This note is a comment on the paper of B. C. Moon and Z. Bien (Failure detection, identification and accommodation based on a new accommodation filter) 1991,Int. J. Systems Sci.,22, 1025. The authors give an original formulation of the problem of failure detection of sensors and actuators based on a state reconstruction via observers. In this response, we follow the proposed method which is simplified and compared to a more direct approach.

ISSN:0020-7721    

DOI:10.1080/00207729308949554

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor