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Volume 131
Issue 3
IEE Proceedings D (Control Theory and Applications)
Volume 131, Issue 3, May 1984
Volumes & issues:
Volume 131, Issue 3
May 1984
Adaptive control of discrete-time time-varying systems with unknown deterministic disturbances
- Author(s): X. Xianya and R.J. Evans
- Source: IEE Proceedings D (Control Theory and Applications), Volume 131, Issue 3, p. 81 –84
- DOI: 10.1049/ip-d.1984.0014
- Type: Article
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In the paper the authors extend their previous work on adaptive control of time-varying systems to the case of systems with unknown time-varying deterministic disturbances. Several simulation results are presented.
Reachability in variable structure control systems
- Author(s): B.A. White and P.M. Silson
- Source: IEE Proceedings D (Control Theory and Applications), Volume 131, Issue 3, p. 85 –91
- DOI: 10.1049/ip-d.1984.0015
- Type: Article
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85
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The conditions are developed for a variable structure control system to reach a switching function null space from anywhere in state space. Conditions are generated for full gain switching and reduced gain switching conditions. It is shown that as fewer gains are switched more of the state space has trajectories which move away from the switching null space, but reachability can still be maintained by suitable choice of switching function gains.
Functional bounds on the time response of multivariable nonlinear systems
- Author(s): J.O. Gray and D. Valsamis
- Source: IEE Proceedings D (Control Theory and Applications), Volume 131, Issue 3, p. 92 –98
- DOI: 10.1049/ip-d.1984.0016
- Type: Article
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92
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The paper describes the derivation of an easily computable functional inequality which represents an absolute vector bound on the linearisation-induced time response error for multivariable systems with measurement nonlinearity. The absolute bound depends on important linearised system descriptions and certain nonlinearity associated parameters and can be particularly useful in anticipating worst case linearised system performance degradation due to the nonlinearity. As such the absolute bound has a significant application in relation to the linearisation-based design of controllers for prescribed time domain system behaviour.
Efficient algorithm for the optimal control of interconnected stochastic systems
- Author(s): A.K. Mahalanabis and G. Ray
- Source: IEE Proceedings D (Control Theory and Applications), Volume 131, Issue 3, p. 99 –102
- DOI: 10.1049/ip-d.1984.0017
- Type: Article
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99
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The paper examines the computational requirements of the centralised solution of the optimal control problem for a linear invariant continuous time interconnected stochastic system. The number of major computer operations involved in the solution of this problem is shown to be significantly reduced when the system model is transformed to a canonical form and when the Riccati equation based algorithm is replaced by the Chandrasekhar equation based algorithm. A numerical example illustrating the results is also presented.
Robust controller design by minimisation of the variation of the coefficients of the closed-loop characteristic equation
- Author(s): C.S. Berger
- Source: IEE Proceedings D (Control Theory and Applications), Volume 131, Issue 3, p. 103 –107
- DOI: 10.1049/ip-d.1984.0018
- Type: Article
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103
–107
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A robust controller is obtained by the minimisation of a cost function which is a measure of the deviations of both the transient and steady-state behaviour from the desired specifications. Examples show that robustness is increased if the controller order is increased.
Square-root solution for the discrete-time lyapunov equation
- Author(s): K.V. Fernando and H. Nicholson
- Source: IEE Proceedings D (Control Theory and Applications), Volume 131, Issue 3, p. 107 –108
- DOI: 10.1049/ip-d.1984.0019
- Type: Article
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107
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