摘要:

Two discrete time H∝mixed sensitivity problems are investigated, and a closed formula derived for the optimal cost associated with each. Our approach is based on a state-space analysis, and involves solving two H∝Riccati equations in terms of the stabilizing solutions to associated H2Riccati equations. This not only enables the optimal cost to be directly obtained, but also allows considerable simplification of the process of generating controllers which satisfy any desired suboptimal bound. The main result is proved using conditions given with a recent 2-Riccati-equation characterization of discrete time controllers satisfying a closed loop H∝norm bound.

ISSN:0020-7179    

DOI:10.1080/00207179208934233

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

In his work on optimum loop synthesis, East makes a number of alterations to the quantitative feedback theory (QFT) method of controller synthesis as expressed by Horowitz. This paper examines some of these alterations and points out some significant errors.

ISSN:0020-7179    

DOI:10.1080/00207179208934234

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

For a singular, non-causal descriptor system of order n, a (p — k)lh order observer is proposed where p =n — q, q is the number of infinite non-dynamic modes of the system and k is the rank of a matrix obtained from a transformed system derived by using the singular value decomposition. Some useful results are given which establish the existence of this observer and which resolve problems encountered with pth order observers proposed in the literature. Robustness is achieved by choosing optimum gain matrices which reduce the sensitivity of observer performance to perturbations.

ISSN:0020-7179    

DOI:10.1080/00207179208934235

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

In a recent paper, Hou and Hsu (1991) derive a state-space identification method which apparently improves upon the results of Moonen el al. (1989). Here we point out that neither one of these methods really applies to the examples given in the paper, and we give an outline of a method which should be used instead.

ISSN:0020-7179    

DOI:10.1080/00207179208934236

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

ISSN:0020-7179    

DOI:10.1080/00207179208934237

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

ISSN:0020-7179    

DOI:10.1080/00207179208934238

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor