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1887

IEE Proceedings D (Control Theory and Applications)

Volume 134, Issue 1, January 1987

Volumes & issues:

Volume 134, Issue 1

January 1987

Robust brake control for a heavy-duty truck
Estimation of uncertainty bounds for robustness analysis
  • Author(s): A.P. Loh ; G.O. Corrêa ; I. Postlethwaite
  • Source: IEE Proceedings D (Control Theory and Applications), Volume 134, Issue 1, p. 9 –16
  • DOI:  10.1049/ip-d.1987.0002
  • Type: Article
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  • p. 9 –16 (8)
    The paper considers the problem of deriving perturbed plant models from noisy input/output data. It is motivated by the use of the former in robust multivariable control analysis/design procedures. The approach taken centres around constructing confidence regions for the plant frequency response at a finite number of frequencies via spectral estimates and on an elementwise basis. The basic building block is the derivation of the distributions required for obtaining the gain and phase confidence intervals at a single frequency for a SISO frequency response.
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Filter controllers for bank-to-turn CLOS guidance
Pole-zero placement controllers and self-tuning regulators with better set-point tracking
  • Author(s): S.C. Puthenpura  and  J.F. MacGregor
  • Source: IEE Proceedings D (Control Theory and Applications), Volume 134, Issue 1, p. 26 –30
  • DOI:  10.1049/ip-d.1987.0004
  • Type: Article
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  • p. 26 –30 (5)
    A new procedure for designing controllers and explicit self-tuning regulators is presented. This method allows the placement of closed-loop poles of a given system arbitrarily like other existing methods. The additional attractive feature of the new procedure is the elimination of tracking error for a given set of input (reference) signals. This is done by placing the zeros of the ‘error transfer function’ at the modes of reference signals. This is very useful in some practical applications like radar tracking and robotics. Some results of simulations are included which illustrate these aspects of the proposed method.
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A modified state-space approach to multivariable self-tuning control with pole assignment
An interference effect of independent delays
  • Author(s): N. MacDonald
  • Source: IEE Proceedings D (Control Theory and Applications), Volume 134, Issue 1, p. 38 –42
  • DOI:  10.1049/ip-d.1987.0006
  • Type: Article
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  • p. 38 –42 (5)
    For a second-order linear retarded delay-differential equation with two independent delays, two methods are used to demonstrate an interference effect that can reduce the likelihood of instability. Both methods rely on the basic result that stability changes only take place at pure imaginary values of the complex eigenvalue. One method uses the eliminant, which is zero if and only if both real and imaginary parts of the characteristic equation are satisfied. The other is an extension of a method used in problems with one delay, in which a certain curve is plotted to find whether it intersects the unit circle. When this interference effect is present, equal delays are particularly unlikely to destabilise.
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The robust decentralised stabilisation of complex feedback systems
  • Author(s): Osita D.I. Nwokah
  • Source: IEE Proceedings D (Control Theory and Applications), Volume 134, Issue 1, p. 43 –47
  • DOI:  10.1049/ip-d.1987.0007
  • Type: Article
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  • p. 43 –47 (5)
    In the paper, we study the stability and performance robustness of composite feedback systems under decentralised control. It is shown that, if the perturbed system transfer matrix is a composite H-matrix for every s on the Nyquist contour, then stabilisation of the diagonal blocks of the composite system implies stabilisation of the overall system, provided the number of unstable poles of the composite system coincide with those of the diagonal blocks. This is then used to define decentralised controllers for robust stability. When restricted to regular multivariable systems, the new criterion leads to an interesting and simple condition on the peak magnification factor Mp of the closed-loop system.
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Self-tuning control of muscle relaxation and the identification of relaxant pharmacokinetics
Self-tuning control of muscle relaxation and the identification of relaxant pharmacokinetics
Stable reduced-order models for discrete-time systems
Stable reduced-order models for discrete-time systems
Recent trends in linear optimal quadratic multivariable control system design
  • Author(s): M.A. Johnson  and  M.J. Grimble
  • Source: IEE Proceedings D (Control Theory and Applications), Volume 134, Issue 1, p. 53 –71
  • DOI:  10.1049/ip-d.1987.0012
  • Type: Article
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  • p. 53 –71 (19)
    The use of the linear quadratic optimal problem (LQ) and the linear quadratic Gaussian (LQG) methodologies for the design of multivariable control systems is reviewed. The past decade has seen further developments in the solution procedures for these problems; in particular, the frequency domain techniques have experienced considerable refinement. The practical problems arising from the LQ/LQG methodology have also been the subject of considerable theoretical analysis. In the sequel, the recent frequency domain ideas are presented including the use of generalised spectral factor and polynomial systems theory. The practical aspects which are reviewed include the selection of performance criterion weighting matrices, robustness and integrity. Looking to the future, the newer research areas of optimal robustness and the application of LQG controllers in self-tuning control systems are also discussed.
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Book review: Computer Controlled Systems: Theory and Design

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