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IEE Proceedings D - Control Theory and Applications

Issue 3 • Date May 1991

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Displaying Results 1 - 16 of 16
  • Agile computer control and surveillance systems

    Publication Year: 1991, Page(s):185 - 192
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (618 KB)

    The response and stability limits of computer-operated control and surveillance systems that employ variable sampling rates are investigated. Stability calculations and simulated results are presented.<> View full abstract»

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  • Algorithm to produce a system of type number m using state variable feedback

    Publication Year: 1991, Page(s):193 - 198
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (516 KB)

    Describes a searching algorithm, based on the Routh array, to determine the unknown coefficients of a Hurwitz polynomial A(s) of degree n, where polynomial P(s) of degree m-1(m-1 View full abstract»

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  • Empirical comparison of methods of fuzzy relational identification

    Publication Year: 1991, Page(s):199 - 206
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (865 KB)

    A number of methods have been proposed for the identification and self learning of relational fuzzy models. The paper compares some of the methods and looks at their tolerance to noise and to the choice of initial fuzzy ranges. Data from runs of a simulated fed-batch fermenter are used as a test case. The results show that identified relational models can give as good results as rule-based models ... View full abstract»

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  • Single-channel controllability of interconnected systems

    Publication Year: 1991, Page(s):207 - 210
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (304 KB)

    A system (A, B/sub d/) with two input channels which correspond to its two interconnected subsystems (A/sub 11/, B/sub 11/) and (A/sub 22/, B/sub 22/), is considered. The conditions for (A, B/sub d/) to be controllable by only one of the input channels are then formulated. The conditions found replace the usual controllability conditions and involve only certain submatrices of the initial system m... View full abstract»

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  • Asymptotic observer design for constrained robot systems

    Publication Year: 1991, Page(s):211 - 216
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (465 KB)

    Two types of asymptotic observer are constructed for constrained robot systems in this paper. Since a constrained robot, in general, involves a set of differential equations and a set of algebraic equations, both differential and algebraic variables should be estimated. This gives arise to difficulty in estimating the algebraic variables which are the contact forces. The difficulty is eased by int... View full abstract»

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  • RESCU: a real-time knowledge based system for process control

    Publication Year: 1991, Page(s):217 - 227
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1218 KB)

    The paper reports the activities of a community club-RESCU (real-time expert system club of users), formed to design and build an operational real-time knowledge based system for process control. It gives the background to the club and the mechanisms developed to ensure the dissemination of the knowledge gained during the development of the project. A set of requirements for real-time knowledge ba... View full abstract»

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  • Application of stochastic optimal control to thin rib machining

    Publication Year: 1991, Page(s):228 - 236
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (989 KB)

    The optimal control of stochastic systems, such as a thin rib machining process, can lead to improved productivity and enhanced accuracy. The paper addresses the problem of identification and optimal control of stochastic tool path error in a thin rib machining process, both analytically and experimentally. Tool path error, in numerically controlled machines, consists of both deterministic and sto... View full abstract»

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  • Optimal tracking with previewed commands

    Publication Year: 1991, Page(s):237 - 241
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (452 KB)

    Considers the tracking of a command or reference input, whose future values are known up to a given horizon. The approach used is to solve a spectral factorisation for the optimal closed-loop poles, followed by a set of equations which give additional system zeros. This set of equations arises from a least-squares optimisation-based procedure, previously used to design moving-average prefilters fo... View full abstract»

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  • Tracking periodic inputs using sampled compensators

    Publication Year: 1991, Page(s):242 - 248
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (548 KB)

    There are many control system applications where there is a requirement to track a reference signal which is periodic. Examples of this type of application include scanning systems such as those for optical surveillance or radar tracking, and industrial automation systems where robots repetitively follow set trajectories. The conventional integral compensator gives zero error at steady state by pr... View full abstract»

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  • Improvement of greenhouse heating control

    Publication Year: 1991, Page(s):249 - 255
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (649 KB)

    Improvements to the control of the temperature in greenhouses heated by hot water pipes were developed in order to enhance both energy conservation and crop protection. Acceptable control can be obtained in some greenhouses by feedback of internal air temperature samples only, but much more robust control is obtained if heating pipe temperatures are included in the feedback. The heating system has... View full abstract»

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  • Artificial neural networks in process engineering

    Publication Year: 1991, Page(s):256 - 266
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1193 KB)

    The concepts involved in the formulation of artificial neural networks are introduced. Their suitability for solving some process engineering problems is discussed and illustrated using results obtained from both simulation studies and applications to industrial process data. In the latter, neural network models were used to provide estimates of biomass concentration in industrial fermentation sys... View full abstract»

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  • Optimal model-following control of a positioning drive system with a permanent-magnet synchronous motor

    Publication Year: 1991, Page(s):267 - 273
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (463 KB)

    In the paper, a method for the optimal control of a positioning drive with a permanent-magnet synchronous motor (PMSM) is developed. The proposed control method eliminates or reduces the influence of disturbances on the dynamics of the system. It is shown that the suggested methods are useful not only in the case of a linear system but also in a system with current and speed limitations. For this ... View full abstract»

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  • Self-organising fuzzy logic control and application to muscle relaxant anaesthesia

    Publication Year: 1991, Page(s):274 - 284
    Cited by:  Papers (15)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (979 KB)

    The use of self-organising fuzzy logic control for automated drug delivery in muscle relaxant anaesthesia is described. The self-elicitation of a knowledge base is shown to be robust in the presence of model uncertainty, noise contamination, and parameter changes. Being computing intensive, self-organising fuzzy logic control is considered for parallel implementation on transputers, both through u... View full abstract»

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  • Gain margins and phase margins for sampled-data control systems with adjustable parameters

    Publication Year: 1991, Page(s):285 - 291
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (526 KB)

    Presents a method for finding the boundaries of constant gain margin and phase margin of sampled-data control systems. The considered systems are first modified by adding a gain-phase margin tester, then the characteristic equations are formulated and factored into stability equations, and finally the parameter-plane method is used to find the boundaries of constant gain margin and phase margin. T... View full abstract»

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  • Geometric approach for fault diagnosis in linear dynamic control systems

    Publication Year: 1991, Page(s):293 - 302
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (868 KB)

    A method for multiple fault diagnosis of plants described by a linear difference model is proposed in the form of an algorithm. The algorithm is based on the observation that, when the number of faulty units of the system is known, the set of faulty units can be differentiated from other sets by checking linear varieties in the measurement data space. It is further shown that the system with t num... View full abstract»

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  • Self-tuning predictive PID controller

    Publication Year: 1991, Page(s):303 - 311
    Cited by:  Papers (7)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (846 KB)

    A recursive algorithm for the automatic tuning of PID regulators is described. The tuning strategy is based on the minimisation of a performance index which considers the quadratic deviations of the predicted output, over the set point, as well as the control efforts, over a time horizon. The adaptive version of this algorithm follows an explicit scheme so that the applications are not limited to ... View full abstract»

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