摘要:

A correspondence between input estimation (deconvolution) and feedforward is discussed from a polynomial point of view. Optimal estimation and feedforward control filters are derived from a spectral factorization and a polynomial equation. Simple loop transformations are used for transforming one problem into the other. The close relationship cannot be explained by the well-known duality between optimal state estimation and feedback control. Instead, it rests on the fact that both the problems discussed are open loop. They can be seen as two interpretations of one underlying design problem. Several other open-loop problems can be described in this framework.

ISSN:0020-7179    

DOI:10.1080/00207178808906276

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

A new two-dimensional stability test is proposed, based on the stability robustness analysis of a relevant 1-D system family. A linear algebra type algorithm for numerical implementation of the test is also described. Two examples then follow, to illustrate the use of the algorithm and the feasibility of the proposed test.

ISSN:0020-7179    

DOI:10.1080/00207178808906277

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The H∞optimal controller for 1-block problems is shown to have a McMillan degree bound of n, where n is the degree of the plant. An example is given where the bound is attained. The result follows simply from the work of Limebeer and Anderson (1987) and Limebeer and Hung (1987), who (because of a small oversight) derived a bound of n - 1. Problems for which the bound is n - 1 are characterized.

ISSN:0020-7179    

DOI:10.1080/00207178808906278

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The structure of the adaptive regulator in a paper by Choiet al. (1986) is simplified by utilizing the positive definiteness of the inertia matrix.

ISSN:0020-7179    

DOI:10.1080/00207178808906279

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Jiang (1988) gives a sufficient and necessary condition for the asymptotic stability of a discrete linear interval system. It is here demonstrated through counter-examples that the condition isnotsufficient. The flaw leading to this erroneous result is also indicated.

ISSN:0020-7179    

DOI:10.1080/00207178808906280

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Shafai (1988) proposed a state observer design algorithm which is very slightly different from an earlier algorithm of Tsui (1985). Furthermore, the change made by Shafai severely worsens the parallel computation property, the only key property of his algorithm claimed by Shafai. It is important to mention that this comment is obviously valid for the dual version of Shafai's algorithm (state feedback design for pole assignment), which has appeared elsewhere several times recently.

ISSN:0020-7179    

DOI:10.1080/00207178808906281

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor