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IEE Proceedings D - Control Theory and Applications

Issue 6 • November 1982

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Displaying Results 1 - 15 of 15
  • Sensitivity and robustness in control systems theory and design

    Publication Year: 1982, Page(s):213 - 214
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | PDF file iconPDF (304 KB)
    Freely Available from IEEE
  • Quantitative feedback theory

    Publication Year: 1982, Page(s):215 - 226
    Cited by:  Papers (46)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1398 KB)

    In quantitative feedback theory, plant parameter and disturbance uncertainty are the reasons for using feedback. They are defined by means of a set Q = {P} of plant operators and a set D = {D} of disturbances. The desired system performance is defined by sets of acceptable outputs Au in response to an input u, to be achieved for all P¿¿ Q. If any design freedom remains in the achievement of the de... View full abstract»

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  • Sensitivity reduction in ship-manoeuvring performance via nonlinear compensation

    Publication Year: 1982, Page(s):227 - 232
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (732 KB)

    During a manoeuvre it is frequently found that a ship's yaw dynamics vary widely. To obtain a consistent response to the helm, it is therefore advisable to provide an autopilot to cope with plant uncertainties. Using the method of Horowitz, a high-loop-gain linear system may be designed which achieves an acceptable spread of transient responses. Unfortunately, there is a penalty to be paid in the ... View full abstract»

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  • Principal gains and phases: insensitive robustness measures for assessing the closed-loop stability property

    Publication Year: 1982, Page(s):233 - 241
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1088 KB)

    In the paper, the use of principal gains and phases in assessing the robustness of the closed-loop stability property is examined. An improved version of the recently developed principal gain-phase method is presented, and conditions are derived under which the technique is insensitive to small perturbations. View full abstract»

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  • Analysis of feedback systems with structured uncertainties

    Publication Year: 1982, Page(s):242 - 250
    Cited by:  Papers (468)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1047 KB)

    The paper introduces a general approach for analysing linear systems with structured uncertainty based on a new generalised spectral theory for matrices. The results of the paper naturally extend techniques based on singular values and eliminate their most serious difficulties. View full abstract»

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  • Stability margins of diagonally perturbed multivariable feedback systems

    Publication Year: 1982, Page(s):251 - 256
    Cited by:  Papers (119)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (771 KB)

    For diagonally perturbed linear time-invariant multivariable feedback systems, the problem of finding an improved characterisation of the stability margin is examined. A readily computable lower bound for diagonally perturbed systems is developed using Perron-Frobenius non-negative matrix results. The present theory improves upon the existing singular-value stability-margin theory, providing a sim... View full abstract»

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  • Frequency-response design of robust optimal controllers

    Publication Year: 1982, Page(s):257 - 262
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (734 KB)

    A simple guide to specifying the bandwidth of an optimal control feedback system (as measured by the unity-loop-gain crossover frequency) is developed. A brief description is given of how the guide helps in the design of robust optimally controlled systems. The only information necessary to use the guide is an open-loop gain plot for the plant, thus providing the designer with a powerful design to... View full abstract»

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  • Optimal control of linear uncertain multivariable stochastic systems

    Publication Year: 1982, Page(s):263 - 270
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (902 KB)

    A technique is described for the design of linear multivariable systems in which the plant parameters are constant but unknown. These parameters are represented by random variables with known mean values and variances. A Wiener type of z-domain solution is derived to the resulting generalised linear quadratic optimal control problem. These results are also interpreted in the time domain, and the e... View full abstract»

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  • State-inequalities approach to control systems with uncertainty

    Publication Year: 1982, Page(s):271 - 275
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (481 KB)

    Discrete-time systems with uncertainty are considered. The system description is given in terms of a basic state-space model, which is then extended by the use of inequalities. This approach enables the assessment of performance deterioration due to uncertainty and leads to a design of control system with a given degree of risk. Possible applications of the results to the case of discrete-stage sy... View full abstract»

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  • Multivariable stability-margin optimisation with decoupling and output regulation

    Publication Year: 1982, Page(s):276 - 282
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (692 KB)

    A procedure is developed for maximising frequency-weighted stability-margin singular values for a multivariable linear time-invariant feedback control system subject to design constraints requiring decoupling and asymptotic tracking in the presence of unstable command and disturbance signals and closed-loop stability. The results are derived using Sarason's H¿¿ optimal interpolation results, toget... View full abstract»

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  • Robust control strategy for a linear time-invariant multivariable sampled-data servomechanism problem

    Publication Year: 1982, Page(s):283 - 292
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (880 KB)

    A robust control strategy for a linear sampled-data control system such that the error is asymptotically zero not only at, but also between, the sampling instances, in spite of both continuous and discrete disturbances, is proposed. The tracking and the disturbances are assumed to satisfy a linear autonomous differential-difference equation. The control strategy consists of an analogue servocompen... View full abstract»

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  • Design of robust digital set-point tracking controllers for linear multivariable plants with time-delayed inputs

    Publication Year: 1982, Page(s):293 - 297
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (379 KB)

    It is shown that, for a large class of linear multivariable plants with multiple time-delayed inputs, robust digital set-point tracking controllers can be readily designed. The general design methodolgy is based upon the asymptotic analysis of the closed-loop characteristic roots of digitally controlled plants for large sampling periods, and is illustrated by designing a robust digital set-point t... View full abstract»

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  • Robust stability of Smith predictor controllers for time-delay systems

    Publication Year: 1982, Page(s):298 - 304
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (842 KB)

    The paper considers Smith predictor control structures for multivariable process plant with separable delays on the output and analyses the robustness of the control scheme with respect to mismatch between the real plant and its model and simultaneous changes in plant dynamics. The cases of additive and feedback mismatch are considered separately and represented in the form of easily checked graph... View full abstract»

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  • Robustness properties of model-reference adaptive control systems

    Publication Year: 1982, Page(s):305 - 309
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (499 KB)

    Model-reference adaptive schemes are usually designed on the assumption that the structure of the plant transfer function is known, only the parameter values being uncertain. In the paper, the stability properties of such systems are studied when the plant can only be approximately represented by a model of the type assumed, i.e. when its transfer function does not belong to the class for which ex... View full abstract»

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  • Robust decentralised control using output feedback

    Publication Year: 1982, Page(s):310 - 314
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (464 KB)

    A decentralised control scheme is proposed for stabilisation of large-scale systems using dynamic controllers with local output feedback. The scheme is robust with respect to uncertainties in parameters and nonlinearities in the interactions among the subsystems. View full abstract»

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Aims & Scope

Published from 1980-1993, IEE Proceedings D contained significant and original contributions on control theory and its applications. It was devoted to control systems in the broadest sense, covering new theoretical results and the applications of new and established control methods.

Full Aims & Scope