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IET Control Theory & Applications

Issue 10 • Date October 2008

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Displaying Results 1 - 10 of 10
  • Fault estimation for single output nonlinear systems using an adaptive sliding mode estimator

    Publication Year: 2008, Page(s):841 - 850
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (236 KB)

    A class of single output nonlinear systems with an uncertain parameter is considered. A diffeomorphism is first introduced to simplify the system structure, then, by employing an adaptive approach to identify the unknown parameter, a sliding mode approximate estimator is developed to estimate the system state variables. Based on the estimator, a fault estimation scheme is proposed together with an... View full abstract»

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  • Frequency-shaped high-gain compensator for optical disk drive control system

    Publication Year: 2008, Page(s):851 - 859
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (563 KB)

    A frequency-shaped high-gain (FSHG) compensator is proposed and implemented for optical disk drive control systems, such as CD or DVD servo systems. The FSHG compensator is obtained by modifying an error-based disturbance observer. The FSHG compensator can be easily realised as a form of a low cost analogue circuit. The disturbance rejection performance can also be easily improved by filter parame... View full abstract»

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  • Observability recovering by additional sensor implementation in structured bilinear systems

    Publication Year: 2008, Page(s):860 - 865
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (186 KB)

    Sensor placement on the basis of a graphical study for the observability of structured bilinear systems is dealt with. The proposed method is based on a graph-theoretic approach and assumes only the knowledge of the system structure. If a system is not generically observable, solutions of minimal (in sense of quantity) sensor placement are given in order to recover the system observability. This s... View full abstract»

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  • Development of an extended reset controller and its experimental demonstration

    Publication Year: 2008, Page(s):866 - 874
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (511 KB)

    Reset control aims at enhanced performance that cannot be obtained by linear controllers. The conventional reset control is simple for implementation by resetting some of its controller states to zero when its input meets a threshold. However, it is found that in some cases the enhanced performance of conventional reset control is still limited such as with only partial reduction of the overshoot ... View full abstract»

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  • Identification for a signal composed of multiple sinusoids

    Publication Year: 2008, Page(s):875 - 883
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (363 KB)

    A very simple on-line identification method for a measured periodic signal composed of multiple sinusoids is discussed. The bias of the signal and the multiple frequencies of the sinusoids are adaptively estimated based on an identity between a sinusoid and its second-order derivative. The amplitudes and the initial phases of the sinusoids are identified using the estimates of the bias and the mul... View full abstract»

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  • On stability and stabilisation of continuoustime singular markovian switching systems

    Publication Year: 2008, Page(s):884 - 894
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (201 KB)

    The class of continuous-time singular linear systems with Markovian switching is presented. Under full and partial knowledge of the jump rates of the continuous-time Markov process sufficient conditions in the linear matrix inequality setting for the system to be piecewise regular, impulse-free and stochastically stable are developed. A state feedback controller that makes the closed-loop system p... View full abstract»

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  • Synthesis of absolutely stabilising controllers

    Publication Year: 2008, Page(s):895 - 905
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (398 KB)

    The synthesis of fixed order controllers for nonlinear systems with sector bounded nonlinearities is considered. The authors constructed an inner and outer approximation of the set of absolutely stabilising linear controllers by casting the closed loop system as a Lure-Postnikov system. The inner approximation is based on the well-known sufficient conditions that require strict positive realness (... View full abstract»

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  • Vision-based neural network control for constrained robots with constraint uncertainty

    Publication Year: 2008, Page(s):906 - 916
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (351 KB)

    Research on hybrid position and force control of robot manipulators has assumed that the structure of constraint surface is known exactly. However, in many force control applications of robot, the exact model of the constraint surface cannot be obtained. In the presence of the constraint uncertainty, it is difficult to analyse the stability of the force control system. A vision-based neural networ... View full abstract»

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  • Supervised stabilisation of linear discrete-time systems with bounded variation rate

    Publication Year: 2008, Page(s):917 - 929
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (261 KB)

    The stabilisation problem of linear, discrete-time, time-varying systems in the framework of the frozen-time approach is considered. Assuming bounded time variations of system parameters, a gain-scheduling control policy is proposed. A family of linear time-invariant eigenvalue assigning controllers is designed on the basis of the corresponding family of frozen-time plants. The final time-varying ... View full abstract»

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  • Six-degree-of-freedom synchronised adaptive learning control for spacecraft formation flying

    Publication Year: 2008, Page(s):930 - 949
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1906 KB)

    An adaptive learning synchronisation control strategy for six-degree-of-freedom spacecraft formation flying based on the cross-coupling concept is presented. The proposed strategy allows the spacecraft track the desired attitude and position trajectories in a synchronised fashion, in the presence of periodic disturbances and uncertainties in constant parameters. Illustrative simulations of spacecr... View full abstract»

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IET Control Theory & Applications is devoted to control systems in the broadest sense, covering new theoretical results and the applications of new and established control methods.

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