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IEE Proceedings - Control Theory and Applications

Issue 6 • Date Nov 1997

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Displaying Results 1 - 15 of 15
  • Learning issues in model reference based fuzzy control

    Publication Year: 1997, Page(s):605 - 611
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (612 KB)

    The question of learning in fuzzy model reference learning control (FMRLC) is investigated and it is proposed that the extent and importance of learning may potentially be less than has been claimed previously. An alternative view of FMRLC, incorporating proportional plus integral action in place of the updating mechanism of the fuzzy logic controller, and which has similarities with a form of lin... View full abstract»

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  • Adaptive integral control of time-delay systems

    Publication Year: 1997, Page(s):531 - 536
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (576 KB)

    It is well known that if the steady-state gain G(0) of a stable lumped system, with transfer function G(s) is positive, then compensating the system by an integral controller k/s, where k is a gain parameter, leads to a stable closed-loop system which achieves tracking of arbitrary constant reference signals, provided that the gain parameter k is positive and sufficiently small. It is also well kn... View full abstract»

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  • Incremental fuzzy PI control of a solar power plant

    Publication Year: 1997, Page(s):596 - 604
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1028 KB)

    Between 1957 and 1997, considerable research effort has been devoted to improving the efficiency of solar thermal power plants with distributed collectors, not only in the field of optical technology but also from the control and optimisation viewpoint. The article deals with this second aspect, and presents results obtained in the control of the distributed solar collector field of the solar powe... View full abstract»

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  • Neural implementation of GMV control schemes based on affine input/output models

    Publication Year: 1997, Page(s):521 - 530
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (908 KB)

    Minimum variance (MV) and generalised minimum variance (GMV) control methods are studied with respect to a particular class of nonlinear input/output recursive models. The plant model is affine control variable. The prediction introduced and nonlinear MV/GMV control design techniques are developed based on these. Suitable neural networks are employed for the estimation of the nonlinearities of the... View full abstract»

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  • Realisation of two-degrees-of-freedom compensators

    Publication Year: 1997, Page(s):589 - 595
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (656 KB)

    This paper presents two alternative realisations for two-degrees-of-freedom (2-DOF) compensators. The characterisation of 1-DOF and 2-DOF compensators is first presented in terms of the set of allowable designs: the advantages of a 2-DOF compensator over a 1-DOF are also reviewed. Despite these advantages, 2-DOF compensators are not used as expected. One possible reason being the lack of design me... View full abstract»

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  • Quadratic guaranteed cost and disc pole location control for discrete-time uncertain systems

    Publication Year: 1997, Page(s):545 - 548
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (340 KB)

    The paper deals with quadratic guaranteed cost control with pole placement in a disk. The objective is twofold. First to translate the discrete-time systems previous results for continuous-time systems. It is shown that in the two cases (discrete and continuous time), the procedures to design a state feedback control which places the poles in a disc and ensures a performance level through a linear... View full abstract»

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  • Convolved and simultaneous two-mode input shapers

    Publication Year: 1997, Page(s):515 - 520
    Cited by:  Papers (29)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (580 KB)

    Input shaping is a method of reducing residual vibrations in computer controlled machines. Vibration is eliminated by convolving a sequence of impulses with a desired system command to produce a shaped input that is then used to drive the system. Techniques for designing the impulse sequence for two-mode systems are presented. Properties of the various techniques are compared as a function of the ... View full abstract»

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  • Simulated annealing for multiobjective control system design

    Publication Year: 1997, Page(s):582 - 588
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (720 KB)

    Engineering design problems are generally multiobjective in that they require several, generally conflicting requirements to be met. One approach to solving a multiobjective design problem is to formulate the problem as a set of algebraic inequalities that must be satisfied for a successful design. Based on simulated annealing, two algorithms to solve a set of inequalities are proposed. The perfor... View full abstract»

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  • Nonlinear autopilot control design for a 2-DOF helicopter model

    Publication Year: 1997, Page(s):612 - 616
    Cited by:  Papers (19)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (396 KB)

    Illustrates a robust control scheme for application to helicopters in vertical flight mode (both take-off and landing) to guarantee altitude stabilisation. A nonlinear helicopter model is used to derive the proposed control in which Lyapunov's direct method is used to establish the overall system stability. A recursive design technique is applied to design a nonlinear robust controller using the h... View full abstract»

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  • Robust output tracking for MIMO nonlinear systems: an adaptive fuzzy systems approach

    Publication Year: 1997, Page(s):537 - 544
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (660 KB)

    An adaptive fuzzy systems approach to state feedback input-output (I/O) linearising controller is outlined. The analysis is based on a general nonlinear multi-input multi-output (MIMO) systems, with minimum phase zero dynamics and uncertainties satisfying the matching condition. The adaptive fuzzy system is incorporated into the control system as an outer feedback loop to increase the robustness o... View full abstract»

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  • Reduced-order estimator for closed-loop online estimation of cross-directional parameters in a plastics extrusion process

    Publication Year: 1997, Page(s):549 - 557
    Cited by:  Papers (3)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (840 KB)

    The paper addresses the problem of estimating the “effective” actuator centre locations in a plastics extrusion process while the process is operating in closed loop. It shows that it is possible to use a lower-order model estimator and hence considerably reduce the complexity of the procedure. The estimator is described as a radial basis function network, where the basis functions in ... View full abstract»

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  • Nonlinear internal model control using local model networks

    Publication Year: 1997, Page(s):505 - 514
    Cited by:  Papers (23)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (972 KB)

    Local model (LM) networks represent a nonlinear dynamical system by a set of locally valid submodels across the operating range. Training such feedforward structures involves the combined estimation of the submodel parameters and those of the interpolation or validity functions. The paper describes a new hybrid learning approach for LM networks comprising ARX local models and normalised Gaussian b... View full abstract»

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  • Fourier series neural network-based adaptive variable structure control for servo systems with friction

    Publication Year: 1997, Page(s):559 - 565
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (592 KB)

    In this paper, a Fourier series neural network is introduced to approximate a nonlinear, complex and unknown function caused by the frictional phenomenon. The learning algorithm possesses a bounded gain which is increasing and has a negative derivative for a finite process time. A persistent excitation of neural network results from the combination of a bounded random signal with reference input o... View full abstract»

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  • Unified PID design method based on a maximum peak resonance specification

    Publication Year: 1997, Page(s):566 - 574
    Cited by:  Papers (12)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (848 KB)

    The paper presents a unified approach for the design of PID controllers, based on the contours of the Nichols chart. Using a maximum peak resonance specification, the controller parameters are adjusted such that the open-loop frequency response curve follows the corresponding contour. This approach gives the possibility of handling (at the same time) the maximum peak overshoot, the minimum phase a... View full abstract»

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  • Optimal observers for disturbance rejection in two-degree-of-freedom LQI servo systems

    Publication Year: 1997, Page(s):575 - 581
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (692 KB)

    The paper is concerned with the design problem of two-degree-of-freedom (2DOF) LQI servo systems with optimal tracking characteristics for step references and optimal rejection characteristics for step disturbances. Unlike most of the literature dealing with such a problem, this paper has the following features. First, we consider such an intrinsically 2DOF design method in which the gain for the ... View full abstract»

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