ISSN:0020-7179    

DOI:10.1080/00207178408933239

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

A method of designing a discrete adaptive observer is proposed for a general class of linear time-invariant multivariable systems. This method is an extension of the procedure described by Kanai and Degawa (1979) for single-input single-output systems. A parameter updating algorithm is derived based upon a recursive least squares method and the number of iterations required for parameter convergence is examined.

ISSN:0020-7179    

DOI:10.1080/00207178408933240

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

This paper is concerned with the optimization of robustness in a multi-input multi-output linear time-invariant finite dimensional feedback system. The objective is to derive a closed-form solution to the problems of the synthesis of optimal controllers that either minimize the weighted sensitivity function or maximize the excess robust ness with respect to Hankel norm criterion. An all-pass solution for the minimum Hankel norm is employed to treat our problems. Finally, the infinite norm case is also discussed.

ISSN:0020-7179    

DOI:10.1080/00207178408933241

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

In this paper a stability test method is demonstrated and explicit stability conditions for the first-order retarded delay differential system with constant coefficients in the delay interval are obtained. This paper shows that under suitable conditions a class of first-order delay systems can be alternately stable as the delay h→∞.

ISSN:0020-7179    

DOI:10.1080/00207178408933242

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

In this new approach to designing multivariable feedback controllers in the time domain the model uncertainties are dealt with in the sense of unknown-but-bounded uncertainties. They are described by multi-input multi-output comparison systems. Thus, the character of the plant as a multi variable dynamical system is preserved even in the considerations of the uncertainties. The controller parameters are selected by means of well-known design algorithms. The robustness of the controller is investigated on the basis of a stability condition and an estimate of the input-output behaviour of the incompletely known closed-loop original system. The results are illustrated by a practical design example.

ISSN:0020-7179    

DOI:10.1080/00207178408933243

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

A recursive estimator is presented which, when given attitude measurements from a star mapper and rate integrating gyro, together with control signals, provides filtered estimates of gyro drift, disturbing angular acceleration, body angular velocity and attitude. Attention is restricted at present to satellites with substantially rigid body dynamics and negligible inter-axis coupling. A single axis attitude control system is considered, this being sufficient for demonstration of the principles. The estimator is based on the Kalman filter with the following developments ; (a) A low level fictitious covariance matrix element is introduced to facilitate estimation of the disturbing angular acceleration, and (b) the gain matrix is modified to enable the real-time model iterations and gyro sampling to be carried out at a much higher rate than the star mapper sampling. Furthermore, the part of the gain matrix relevant to the star mapper output is adapted to enable the correction to the model to be applied continuously, thereby avoiding stepping of the state estimate following new star mapper measurements. A form of the estimator is presented in which it is unnecessary to know the time to the next star mapper reading. Digital simulation results are given for a complete control system in which two control loops are completed by state-variable feedback, comprising a linear gyro-drift control law and a non-linear gas jet control law.

ISSN:0020-7179    

DOI:10.1080/00207178408933245

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

The infinite-dimensionalroot locus is generalized to include systems with cluster points in their spectra, by using the theory ofHpspaces.

ISSN:0020-7179    

DOI:10.1080/00207178408933246

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

A discrete recursive time-domain identification algorithm based on gradient estimation approach is proposed for linear time-invariant lumped-parameter systems. The scheme is quite general. Without invoking the strictly positive real lemma, Landau's proportional plus integral algorithms are shown to be the special cases of the proposed algorithm. Other gradient estimation based algorithms are also shown to be the special cases. The convergence of the scheme is proved using the second method of Lyapunov.

ISSN:0020-7179    

DOI:10.1080/00207178408933247

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

Extremely simple sufficient conditions are presented for the stability of interval matrices. These complement the necessary and sufficient conditions developed by Bialas (1983), which become unwieldy for large matrices (4×4 and above).

ISSN:0020-7179    

DOI:10.1080/00207178408933248

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

The outgoing branches from a node of Coates' flow graph are interpreted as the elements of column vectors of the system matrix. The Grassmann algebra is used to calculate the exterior or outer product of these column vectors for evaluating the system determinant. Thus, the gain of a symbolic transfer function or the gain of a flow graph can be determined easily either by hand or by computers.

ISSN:0020-7179    

DOI:10.1080/00207178408933249

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor