ISSN:0890-6327    

DOI:10.1002/acs.4480050102

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1991

数据来源: WILEY

摘要:

AbstractThis paper develops techniques for qualitative and quantitive assessment of the performance that can be achieved with a simple feedback loop. Methods which give order‐of‐magnitude estimates for exploring the achievable performance are presented. The results are of interest for control design, auto‐tuning and expert c

ISSN:0890-6327    

DOI:10.1002/acs.4480050103

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1991

数据来源: WILEY

摘要:

AbstractAnadvanced non‐linear control systemis obtained by combining recent developments in non‐linear control system synthesis with a rule‐based system approach to real‐time control. The basic problem to be addressed is the control of a non‐linear plant which is sufficiently sensitive to both operating point and input amplitude that the desired control system performance can be obtained only with a non‐linear controller that is ‘retuned’ or ‘resynthesized’ whenever the operating point changes significantly. (The term ‘changes significantly’ in this context signifies an operating point change that causes the non‐linear control system input/output behaviour to change substantially in an undesirable way.) This is accomplished by ahierarchically organized intelligent control systemwith a conventional reprogrammable controller under the direction of a rule‐based expert system. The function of the expert system is to(i) monitor the behaviour of the non‐linear control system to determine when retuning or resynthesis is required; if the behaviour is satisfactory, then continue passive monitoring; else(ii) when retuning or resynthesis is required: set up and execute experiments to derive the model information required to tune or synthesize a new non‐linear controller in terms of a given structure and parametrization; execute the retuning/resynthesis procedure; reprogramme the controller (download the parametrization); and recommission the updated non‐linear control system and return to normal operation.In essence, the rule‐based system provides supervisory control (‘meta‐control’) for a conventional reprogrammable non‐linear controller that will autotune or autosynthesize as required. Autosynthesis takes place to accommodate variability in plant behaviour due to operating point changes, and the nonlinear controller thus synthesized corrects for amplitude sensitivity. This concept represents one way to combine artificial intelligence with control; it will be

ISSN:0890-6327    

DOI:10.1002/acs.4480050104

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1991

数据来源: WILEY

摘要:

AbstractIn this paper a demonstration expert system for interaction analysis of time‐invariant, linear, multivariable systems has been developed. The principle is to choose an area that is significant in control design but still limited to be implementable. To our knowledge no such systems have been reported in the literature. The paper first briefly describes the general idea of the developed expert system. Next the software structure of the expert system is given. A short description of the interaction analysis and conclusions finish the pape

ISSN:0890-6327    

DOI:10.1002/acs.4480050105

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1991

数据来源: WILEY

摘要:

AbstractA multivariable control system design approach in the frequency domain is presented. The issue of control system redesign in an adaptive control scheme is discussed. Expert system techniques have been used for the automated design of controllers for multivariable systems. Design knowledge has been represented using rules, facts and objects. The design process consists of a sequence of operations obtained by heuristics and experience in the the design techniques. An automated design session of a multivariable plant using the expert system demonstrates that the expert system appears to work well in its prototype implementation.

ISSN:0890-6327    

DOI:10.1002/acs.4480050106

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1991

数据来源: WILEY

ISSN:0890-6327    

DOI:10.1002/acs.4480050101

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1991

数据来源: WILEY