摘要:

This paper studies a two-degree-of-freedom (2DOF) design method of robust servo systems for step references and disturbances in the setting of output feedback. Specifically, we consider the introduction of a state observer and show that the fundamental desirable properties (i.e. 2DOF nature) attained in the state feedback case are inherited, qualitatively speaking, to the output feedback case. At the same time, we quantitatively clarify the performance deterioration about disturbance rejection caused by the introduction of an observer.

ISSN:0020-7179    

DOI:10.1080/00207179608921666

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

This paper represents the last technical contribution of Professor Patrick Parks before his untimely death in February 1995. The remaining authors of the paper, which was subsequently completed, wish to dedicate the article to Patrick.

ISSN:0020-7179    

DOI:10.1080/00207179608921667

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

A controller/observer pair is presented, on the basis of sliding mode ideas, which provides robust output tracking of a reference signal using only measured output information. Closed-loop analysis indicates that asymptotic tracking of a constant reference signal will be achieved despite the presence of a class of matched uncertainty. Furthermore, a form of ‘separation principle’ is shown to hold for this class of controller and observer, in the sense that they can be designed independently apart from a scalar function of the uncertainty bounds.

ISSN:0020-7179    

DOI:10.1080/00207179608921668

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

In this paper some special results about the robust stability of a linear continuoustime difference system are given. These results may be treated as a natural generalization of the well-known results on the Schur stability of polynomial families defined by convex polytopes in the coefficient space.

ISSN:0020-7179    

DOI:10.1080/00207179608921669

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

This paper presents stability robustness bounds for linear discrete-time systems with time-invariant perturbations. These bounds extend the previous investigations for independent perturbations to dependent perturbations and provide improved results. It is shown that the dependent perturbation bound includes an independent perturbation bound previously reported as a special case. These results are illustrated with simple examples.

ISSN:0020-7179    

DOI:10.1080/00207179608921670

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

This paper comments on a technical problem arising in the article ‘ Precision tracking control of non-minimum phase systems with zero phase error’ by Xia and Menq.

ISSN:0020-7179    

DOI:10.1080/00207179608921671

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor