By Topic

IEE Proceedings D - Control Theory and Applications

Issue 4 • Date July 1988

Filter Results

Displaying Results 1 - 25 of 37
  • Self-tuning control of systems with infrequent and delayed output sampling

    Publication Year: 1988, Page(s):213 - 221
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (732 KB)

    A stochastic self-tuning control algorithm is presented for MIMO systems. It is assumed that the input signals are allowed to change more frequently, then the output measurements are available. The presence of a time delay in the transducer performances is also considered. The algorithm is based on the generalised minimum-variance approach. Robust zero error regulation is ensured for constant set ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Time-domain robustness and performance optimisation of linear quadratic control problems

    Publication Year: 1988, Page(s):223 - 231
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (714 KB)

    To find a single constant state feedback control law that conserves both concepts of stability and performance robustness is the purpose of the paper. The uncertain linear systems considered are described by state equations which depend on parameters subject to large variations. The developed procedure results in designing a regulator having optimal performance for each of several operating modes ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Two-loop self-tuning cascade control

    Publication Year: 1988, Page(s):232 - 238
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (452 KB)

    The stability of two single-input/single-output self-tuning controllers, operating in cascade, is considered for the case when the outer-loop design neglects the inner-loop dynamics. It is shown that the stability properties correspond to those of a single-loop controller with neglected system dynamics: appropriate theorems for the single-input/single-output case can be directly invoked and have a... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • ESPNET: expert-system-based simulator of Petri nets

    Publication Year: 1988, Page(s):239 - 247
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (729 KB)

    A Petri net is a modelling tool used in the design and analysis of systems. The expert system language OPS5 has a similar execution strategy to a Petri net model, and hence Petri nets may be simulated using the OPS5 language. ESPNET has been designed to be used in a rapid prototyping mode to allow users to quickly develop simulation models of the work flow through manufacturing systems. The system... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Questions of controllability and observability for nonuniformly sampled discrete systems

    Publication Year: 1988, Page(s):248 - 252
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (430 KB)

    A joint characterisation of the controllability and observability of a particular kind of discrete system has been developed. The key idea of the procedure can be reduced to a correct choice of the sampling sequence. This freedom, owing to the arbitrary choice of the sampling instants, is used to improve the sensitivity of system controllability and observability, by exploiting an adequate geometr... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Characteristic polynomial assignment in 2-dimensional discrete systems

    Publication Year: 1988, Page(s):253 - 256
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (340 KB)

    The characteristic polynomial assignment for discrete 2-dimensional systems described by the Fornasini-Marchesini model is considered. The similarities and differences of the solutions to this problem, using Roesser's and Fornasini and Marchesini's models, are discussed. Furthermore, the assignment of a part of the characteristic polynomial and the simultaneous calculation of the residual polynomi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analytical redundancy using band-limiting filters

    Publication Year: 1988, Page(s):257 - 267
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1003 KB)

    A method is described whereby faults in control systems may be detected on the basis of the generation and crosscomparison of band-limited signals from dissimilar sources. While signals measured at different points in the system may differ widely when viewed over a wide bandwidth, over limited pass bands there are shown to exist simple relationships which can be verified by means of appropriate fi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Application of optimal control strategy to automatic generation control of a hydrothermal system

    Publication Year: 1988, Page(s):268 - 274
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (590 KB)

    Highlights the design of automatic generation controllers through optimal control strategy, for an interconnected hydrothermal system using a new performance index that circumvents the need for a load demand estimator. The dynamic performances of these controllers are analysed and compared with those obtained through the usual performance index as that used by Fosha and Elgerd (1970), considering ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of the technique of robust eigenstructure assignment with application to aircraft control

    Publication Year: 1988, Page(s):275 - 281
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (566 KB)

    Given the linear state-space representation of a dynamic system, a method for computing allowable eigenvector subspaces using singular value decomposition for both real and complex eigenvalues is illustrated. Once these spaces have been determined, it is possible to assign the eigenvectors in two ways: one which performs desirable weightings of the system states for each mode permitting system dec... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Multipurpose adaptive control in deterministic multivariable systems

    Publication Year: 1988, Page(s):282 - 288
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (540 KB)

    An adaptive control algorithm is presented to achieve the following design objectives: input-output decoupling; complete and arbitrary pole assignment; and some zero assignments in mod z mod >or=1 to deal with the problem of high-order signal tracking. The basic idea of the paper is that, if the realisability can be guaranteed, a multipurpose controller can be obtained directly from the desired tr... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Sequential design of linear quadratic state regulators via the optimal root-locus techniques

    Publication Year: 1988, Page(s):289 - 294
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (531 KB)

    Considers the use of well known root-locus techniques for sequentially finding the weighting matrices and the linear quadratic state regulators of multivariable control systems in the frequency domain. The proposed sequential design method enables the retention of some stable open-loop poles and the associated eigenvectors in the closed-loop system, and it allows some optimal closed-loop poles to ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Adaptive control of optimal model matching in H/sup infinity /-norm space

    Publication Year: 1988, Page(s):295 - 301
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (602 KB)

    In a model reference adaptive control system, the plant is assumed to be unknown in advance, then it is a difficult task to choose an adequate reference model such that the perfect model matching condition (i.e. the unstable plant zeros must be the zeros of the reference model) is assured in every adaptive step. In the paper, based on the theory of the minimum H/sup infinity /-norm, an adaptive co... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Eigenstructure assignment by output feedback in descriptor systems

    Publication Year: 1988, Page(s):302 - 308
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (641 KB)

    Some necessary and sufficient conditions for closed-loop eigenstructure assignment by output feedback in linear time-invariant multivariable descriptor systems are presented. These generalise in a natural way the known corresponding results for state-space systems. However, the author's arguments extend somewhat existing work on eigenstructure assignment by state feedback in descriptor systems. Th... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Convergence of explicit LQG self-tuning controllers

    Publication Year: 1988, Page(s):309 - 322
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1144 KB)

    A global convergence and stability proof is presented for an indirect LQG self-tuning controller which employs a stochastic approximation type of identification algorithm. A discrete linear single/input/single-output time-invariant stochastic system with correlated noise inputs is considered. The plant model need not be stable or minimum phase. The usual assumption that unstable common factors do ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of singular systems using orthogonal functions

    Publication Year: 1988, Page(s):323 - 325
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (236 KB)

    The authors clear up some confusion in the analysis of singular systems using Walsh functions which have been used in some previous publications. The authors show that the idea of using Walsh functions with singular systems is not fundamentally flawed, but that some care is required. Specifically, there may not always exist a solution for a given choice for the number of basis functions. It is als... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Further result on performance degradation for nonlinear multivariable systems

    Publication Year: 1988, Page(s):326 - 328
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (271 KB)

    Kouvaritakis, Harrison, and Latchman (1987) derived bounds on the worst-case deviation that the response of a nonlinear multivariable system can make from its nominal (linear) response. The technique presented there makes use of the properties of L/sub 2/ norms of truncated functions and recently developed matrix scaling techniques to reduce the conservativism which derives from the multivariable ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Multipurpose controller synthesis in LQG optimal systems

    Publication Year: 1988, Page(s):329 - 331
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (206 KB)

    The paper indicates some inaccuracies in an earlier paper by B.S. Chen and W.J. Wang (see ibid., vol.131, p.182-8, 1984). In particular, if the plant is stable, it is not possible to use the algorithm given by the paper to design an LQG optimal controller that achieves the desired purposes. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Self-tuning control of systems with infrequent and delayed output sampling

    Publication Year: 1988, Page(s):213 - 221
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (900 KB)

    In the paper a stochastic self-tuning control algorithm is presented for MIMO systems. It is assumed that the input signals are allowed to change more frequently, then the output measurements are available. The presence of a time delay in the transducer performances is also considered. The algorithm is based on the generalised minimum-variance approach. Robust zero error regulation is ensured for ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Book review: Computer Simulation and Modelling

    Publication Year: 1988
    IEEE is not the copyright holder of this material | PDF file iconPDF (189 KB)
    Freely Available from IEEE
  • Time-domain robustness and performance optimisation off linear quadratic control problems

    Publication Year: 1988, Page(s):223 - 231
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1005 KB)

    To find a single constant state feedback control law that conserves both concepts of stability and performance robustness is the purpose of the paper. The uncertain linear systems considered are described by state equations which depend on parameters subject to large variations. The developed procedure results in designing a regulator having optimal performance for each of several operating modes ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Two-loop self-tuning cascade control

    Publication Year: 1988, Page(s):232 - 238
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (549 KB)

    The stability of two single-input/singleoutput self-tuning controllers, operating in cascade, is considered for the case when the outerloop design neglects the inner-loop dynamics. It is shown that the stability properties correspond to those of a single-loop controller with neglected system dynamics: appropriate theorems for the single-input/single-output case can be directly invoked and have a f... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • ESPNET: expert-system-based simulator of Petri nets

    Publication Year: 1988, Page(s):239 - 247
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (919 KB)

    A Petri net is a modelling tool used in the design and analysis of systems. The expertsystem language OPS5 has a similar execution strategy to a Petri net model, and hence Petri nets may be simulated using the OPS5 language. ESPNET has been designed to be used in a rapid prototyping mode to allow users to quickly develop simulation models of the work flow through manufacturing systems. The system ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Questions of controllability and observability for nonuniformly sampled discrete systems

    Publication Year: 1988, Page(s):248 - 252
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (540 KB)

    A joint characterisation of the controllability and observability of a particular kind of discrete system has been developed. The key idea of the procedure can be reduced to a correct choice of the sampling sequence. This freedom, owing to the arbitrary choice of the sampling instants, is used to improve the sensitivity of system controllability and observability, by exploiting an adequate geometr... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Characteristic polynomial assignment in 2-dimensional discrete systems

    Publication Year: 1988, Page(s):253 - 256
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (419 KB)

    The characteristic polynomial assignment for discrete 2-dimensional systems described by the Fornasini-Marchesini model is considered. The similarities and differences of the solutions to this problem, using Roesser's and Fornasini and Marchesini's models, are discussed. Furthermore, the assignment of a part of the characteristic polynomial and the simultaneous calculation of the residual polynomi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analytical redundancy using band-limiting filters

    Publication Year: 1988, Page(s):257 - 267
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1251 KB)

    A method is described whereby faults in control systems may be detected on the basis of the generation and crosscomparison of bandlimited signals from dissimilar sources. While signals measured at different points in the system may differ widely when viewed over a wide bandwidth, over limited pass bands there are shown to exist simple relationships which can be verified by means of appropriate fil... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.