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IEE Proceedings D - Control Theory and Applications

Issue 3 • May 1992

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Displaying Results 1 - 16 of 16
  • Performance in sampled data systems

    Publication Year: 1992, Page(s):245 - 250
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (280 KB)

    A performance index for control systems has been defined as the supremum of the absolute error that occurs over all time and all inputs. The input to the system is known only to the extent that it belongs to a known function space. The paper shows how this performance index is determined for certain sampled data systems with an input space characterised only by a bound on the derivative of the inp... View full abstract»

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  • Adaptive lattice estimation and control of a manipulator with one flexible forearm

    Publication Year: 1992, Page(s):237 - 244
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (637 KB)

    An application of recursive covariance lattice algorithms to the adaptive estimation and control of a manipulator with one flexible link is presented. These algorithms are a set of pure order recursive lattice equations, which can in principle identify the effective order and the corresponding parameters of an ARMA prediction model of the manipulator. The reduced-order prediction model represents ... View full abstract»

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  • Design of restricted complexity digital regulators using explicit criterion minimisation

    Publication Year: 1992, Page(s):251 - 258
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (530 KB)

    Describes a technique for designing digital regulators when their structure is restricted. A new formula is first derived for computing quadratic performance indices, which indicates that, rather than using iterative algorithms or residue calculus which may be difficult to apply for high-order systems, the problem reduces to solving certain Diophantine equations. Furthermore, gradients of the perf... View full abstract»

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  • Robust stabilisation of multivariable feedback systems with desired performance requirement

    Publication Year: 1992, Page(s):259 - 266
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (504 KB)

    A design criterion is developed to achieve the following goals simultaneously: input-output decoupling of multivariable feedback systems; complete and arbitrary closed-loop pole assignment; desired zero assignment for reference signal tracking; and robust stabilisation of multivariable feedback systems subjected to time-varying nonlinear uncertainties. Thus, the requirements of performance as well... View full abstract»

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  • Improved Wolovich algorithm for determining state-space representations of linear multivariable polynomial systems

    Publication Year: 1992, Page(s):267 - 272
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (411 KB)

    An improved procedure is presented for determining a state-space representation of a given time-invariant system whose dynamic behaviour is expressed in a differential operator form. The algorithm is essentially that developed by Wolovich (1973) with the addition of those details and methods necessary to program the procedure, which were not included in his paper. The main modifications are a new ... View full abstract»

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  • Matched pole-zero discrete-time models

    Publication Year: 1992, Page(s):273 - 278
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (336 KB)

    The previously proposed concept (Hori, Mori, and Nikiforuk, 1989) of classifying various discrete-time models, such as invariant and mapping models is extended to matched pole-zero models. In the existing matched pole-zero methods, the gain adjustment of the discrete-time model is required and the addition of extra zeros is often suggested in the literature. In the newly proposed method, there is ... View full abstract»

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  • Connectionist approach to PID autotuning

    Publication Year: 1992, Page(s):279 - 285
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (565 KB)

    A connectionist method for autotuning PID controllers is proposed. This technique, which is applicable both in open and in closed loops, employs multilayer perceptrons to approximate the mappings between the identification measures of the plant and the optimal PID values. The neural network controller is designed to adapt to changing system structures and parameter values online. To achieve this o... View full abstract»

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  • On the solution of the continuous-time Lyapunov matrix equation in two canonical forms

    Publication Year: 1992, Page(s):286 - 290
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (260 KB)

    A novel algorithm is presented for the solution to the continuous-time Lyapunov matrix equation in controllable and/or observable canonical forms by using the dimension-reduced method. The solution evaluation by this method is more accurate and considerably faster than any previously published methods. Numerical examples are given with systems in stable minimal and in unstable nonminimal forms to ... View full abstract»

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  • Synthesis of pole-zero assignment control law with minimum control input

    Publication Year: 1992, Page(s):291 - 295
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (349 KB)

    A method of control system design is developed to simultaneously consider the internal stability, pole assignment, reference signal tracking and control input minimisation. A parametrised design algorithm of the pole-zero assignment control law is derived to achieve the desired goals. The free parameters are used to minimise the L/sub 2/-norm of the control input signal. Since the requirements of ... View full abstract»

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  • Model validation by the distortion method: linear state space systems

    Publication Year: 1992, Page(s):296 - 300
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (342 KB)

    The distortion method was introduced by Butterfield and Thomas (1986) as a means of verifying a nominal system model, comprising a set of ordinary, nonlinear differential equations, by comparing the model response with a set of experimentally obtained data. The essence of the method is to make the minimum distortions to the model parameters necessary to ensure that the model output exactly matches... View full abstract»

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  • Uncertainty modelling and structured singular-value computation applied to an electromechanical system

    Publication Year: 1992, Page(s):301 - 307
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (616 KB)

    The investigation of closed-loop systems subject to model perturbations is an important issue to assure stability robustness of a control design. A large variety of model perturbations can be described by norm-bounded uncertainty models. A general approach for modelling structured complex and real-valued parametric perturbations is presented. The resulting robustness analysis problem is solved non... View full abstract»

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  • Robust identification of systems using block-pulse functions

    Publication Year: 1992, Page(s):308 - 316
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (679 KB)

    A robust method is employed to identify the unknown parameters of both linear and bilinear systems. Using block-pulse functions, this method expands the system input and output utilising an approach that minimises a robust criterion to reduce the effect of noise, especially large errors (called outliers) on the expansion coefficients. These coefficients are then used to obtain robust estimates of ... View full abstract»

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  • Architecture for integrated process supervision

    Publication Year: 1992, Page(s):317 - 327
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (936 KB)

    An architecture for the integrated supervision of complex dynamic processes is presented. This allows the supervised evolution of the control from normal feedback control during acceptable behaviours to fault diagnosis techniques when the behaviour is considered unacceptable. A behaviour classification method is presented and used to identify the appropriate generic control task. This results in a... View full abstract»

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  • Use of bicausal weighting sequences in least squares identification of open-loop unstable dynamic systems

    Publication Year: 1992, Page(s):328 - 336
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (756 KB)

    Identification of weighting sequences rather than transfer functions offers certain advantages. In open-loop unstable systems such sequences are divergent and thus cannot form the basis of an identification procedure. The paper circumvents this difficulty by proposing the use of bicausal weighting sequences. It also considers the use of weighting sequences in the derivation of transfer function mo... View full abstract»

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  • Graph-theoretic decoupling technique for the design of synchronous generator controllers

    Publication Year: 1992, Page(s):337 - 345
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (595 KB)

    A graph-theoretic decoupling technique is used with the aim of synthesising a controller for a two-input/two-output linearised time invariant model of a synchronous-machine infinite-bus system. A state feedback control law is derived to accomplish the single-input/single-output decoupling action. Moreover, the control law also guarantees a desired location to all the critical eigenvalues of the de... View full abstract»

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  • Note on single-term Walsh series method for singular systems

    Publication Year: 1992, Page(s):347 - 348
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (102 KB)

    By considering linear time-varying singular systems in discrete time it is shown that the single-term Walsh series technique is not applicable to singular systems of index three.<> View full abstract»

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