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Control Theory and Applications, IEE Proceedings D

Issue 2 • Date March 1981

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Displaying Results 1 - 8 of 8
  • Robust decentralised control of a servomechanism problem for a class of nonlinear systems

    Page(s): 33 - 40
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (782 KB)  

    Robust decentralised control of a class of nonlinear system so as to track a given reference input signal and reject a known class of disturbance signals is proposed. The controller consists of tracking-error-driven servocompensators and local stabilisers. The servocompensators contain the modes of not only the external signals but also the internal signals. The local stabiliser must be designed to yield large damping and low overshoot. A computer-aided-design procedure is given. View full abstract»

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  • Design of optimal output regulators using multivariable root loci

    Page(s): 41 - 49
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1045 KB)  

    The LQP output regulator control problem is considered with the usual state feedback solution. A design technique is described which allows the optimal control performance criterion weighting matrices to be selected under conditions of maximal accuracy. A feature of the design technique is that uncontrollable modes can be made unobservable under limiting conditions. The controllable modes can be made as fast as energy considerations allow. The theoretical basis for the method depends on results from the theory of multivariable root loci. The design procedure was developed to simplify the design of dynamic ship-positioning control systems. View full abstract»

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  • Self optimising combustion control of an oil-fired power station boiler

    Page(s): 50 - 55
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (771 KB)  

    Failure to achieve satisfactory control of combustion conditions in an oil-fired boiler leads to undesirable chimney emissions; insufficient combustion air results in the production of black smoke, whereas white acidic smoke is produced by excessive amounts of combustion air. A control strategy has been developed which automatically optimises the combustion conditions by adjusting the air/fuel ratio to minimise a performance index calculated from measurements of combustion products. This control strategy has been implemented on a 100 MW power station boiler using a standard commercially manufactured process control computer.As well as describing the development work necessary, the paper outlines the engineering of the system and discusses some of the contractual arrangements adopted. This system has been in operation for over three years and has proved capable of tight control of combustion conditions even during rapid load changes. Undesirable chimney emissions have now been virtually eradicated. The success of this system has led to the decision to install similar controls on the 500 MW boilers at Pembroke Power Station. View full abstract»

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  • Time-domain system identification applied to noninvasive estimation of cardiopulmonary quantities

    Page(s): 56 - 64
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1139 KB)  

    The paper describes an application of system identification techniques to the estimation of the cardiac output and other cardiopulmonary quantities in human subjects. The method used requires continuous measurements of gas flow rates and gas concentration at the subject's mouth and involves the use of a lumped parameter model of the gas exchange processes. Particular emphasis is given to investigation of the identifiability and determinacy of the model and to the important question of the choice of input test signal. Estimation of the parameters of the model is by an extension of the maximum likelihood method of ¿¿str¿¿m and Bohlin. The paper includes a summary of some encouraging results which have been obtained using this approach. View full abstract»

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  • Evaluation of online identification methods for optimal control of a laboratory model turbogenerator

    Page(s): 65 - 73
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1154 KB)  

    The paper describes the application of four methods of online parameter identification to a laboratory model turbogenerator. It presents a practical assessment of the accuracy and characteristics of each method in obtaining a discrete linear multivariable model of a nonlinear process. State-space controllers have been designed on the basis of these models, and thoroughly tested in the laboratory. The results show that a very high quality of control may be achieved in this manner. View full abstract»

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  • Complex Variable Methods for Linear Multivariable Feedback Systems

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    Freely Available from IEEE
  • Modelling of Dynamical Systems, Vol. 1

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    Freely Available from IEEE
  • Recursive least-squares algorithm revisited

    Page(s): 74 - 76
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (275 KB)  

    A modified form of the recursive least-squares algorithm is proposed. It is shown that this algorithm possesses interesting properties that are valid without any restriction on experimental conditions, or stability assumptions. It is thus especially well suited for adaptive control schemes. View full abstract»

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