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Control Theory and Applications, IEE Proceedings -

Issue 1 • Date Jan 2002

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Displaying Results 1 - 17 of 17
  • Numerical robust stability analysis of fuzzy feedback linearisation regulator based on linear matrix inequality approach

    Publication Year: 2002 , Page(s): 82 - 88
    Cited by:  Papers (7)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (572 KB)  

    A numerical robust stability analysis for the fuzzy feedback linearisation regulator is presented using linear matrix inequalities (LMI) theory. The well known Takagi-Sugeno fuzzy model is used as the nonlinear plant model. Uncertainty is assumed to be included in the model structure with known bounds. For this structured uncertainty, the closed system can be cast into a Lur'e system by a simple t... View full abstract»

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  • Global stabilisation for bilinear systems with time delay

    Publication Year: 2002 , Page(s): 89 - 94
    Cited by:  Papers (3)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (510 KB)  

    Global asymptotic stabilisation is discussed for MIMO bilinear time-delay systems the free dynamics of which are Lyapunov-stable. Sufficient conditions for constructing state feedback, full-order dynamic output feedback and reduced-order dynamic output feedback controllers are established; the sufficient conditions can be delay-independent and delay-dependent as well. The basic analysis is based o... View full abstract»

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  • On-line adaptive tuning for PID controllers

    Publication Year: 2002 , Page(s): 60 - 67
    Cited by:  Papers (6)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (710 KB)  

    Adaptive and robust designs are two major approaches to deal with possible modelling errors in a control system. This paper proposes an adaptive control system for on-line tuning of PID controllers for SISO systems. The proposed system comprises of two adaptive loops. The first loop monitors and tunes the controllers on-line to ensure the system is robustly stable. This first loop enables the syst... View full abstract»

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  • Active fault-tolerant control system against partial actuator failures

    Publication Year: 2002 , Page(s): 95 - 104
    Cited by:  Papers (37)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (830 KB)  

    A novel approach for integrated fault detection, diagnosis and reconfigurable control systems design against actuator faults is proposed. The scheme is based on a two-stage adaptive Kalman filter for simultaneous state and fault parameter estimation, statistical decisions for fault detection, and activation of controller reconfiguration. Using the information from the fault detection and diagnosis... View full abstract»

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  • Multiloop PI/PID controller design based on Gershgorin bands

    Publication Year: 2002 , Page(s): 68 - 73
    Cited by:  Papers (4)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (577 KB)  

    A new definition of the ultimate point is proposed for diagonally dominant, MIMO systems. Analytical formulas are developed for the new ultimate gains and ultimate frequencies based on the system frequency response and Gershgorin bands. Decentralised PI and PID controllers with set-point weighting factors can be tuned by using a modified version of the Ziegler-Nichols (ZN) relations. The proposed ... View full abstract»

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  • Design of decoupled PI controllers for two-by-two systems

    Publication Year: 2002 , Page(s): 74 - 81
    Cited by:  Papers (17)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (758 KB)  

    The design of PI controllers for systems with interacting loops is discussed. It is advantageous to deal with the interaction at the loop level, because supervisory control seldom has sufficient bandwidth. A new scheme based on modified scalar PI design and static decoupling is developed, in which the frequency characteristic of the coupling between the lower-level loops is taken into account. Thi... View full abstract»

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  • Editorial - pid control

    Publication Year: 2002 , Page(s): 1 - 2
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (305 KB)  

    First Page of the Article
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  • Backstepping-based adaptive PID control

    Publication Year: 2002 , Page(s): 54 - 59
    Cited by:  Papers (12)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (492 KB)  

    This paper addresses analysis and design issues in adaptive PID control for linear second-order minimal phase processes using the backstepping algorithm. The first step consists in adding an integral action to the basic backstepping algorithm to obtain a zero static error.. An integrator is therefore added to the plant model and is then slid back to the controller equation at the end of the design... View full abstract»

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  • Quantitative robust stability analysis and PID controller design

    Publication Year: 2002 , Page(s): 3 - 7
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (452 KB)  

    A sufficient condition for robust stability is presented. Comparing it with the small gain theorem, it incorporates both gain and phase information of the uncertain system and thus reduces the conservativeness of the theorem. The proposed quantitative robust stability criterion is employed to develop a robust PID controller design. Finally, simulations are presented to illustrate the proposed meth... View full abstract»

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  • PID controllers: recent tuning methods and design to specification

    Publication Year: 2002 , Page(s): 46 - 53
    Cited by:  Papers (61)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (814 KB)  

    PID control is a control strategy that has been successfully used over many years. Simplicity, robustness, a wide range of applicability and near-optimal performance are some of the reasons that have made PID control so popular in the academic and industry sectors. Recently, it has been noticed that PID controllers are often poorly tuned and some efforts have been made to systematically resolve th... View full abstract»

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  • Robust and optimal tuning of PI and PID controllers

    Publication Year: 2002 , Page(s): 17 - 25
    Cited by:  Papers (27)  |  Patents (3)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (763 KB)  

    A general controller evaluation method based on three performance and robustness criteria is presented. It can be used to compare controllers of different structures, but also as a design method to find the optimal parameter setting for a controller of given structure. In this way optimal PI and PID controllers have been designed for a set of different plants. Clear regularities have then been not... View full abstract»

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  • Generalised minimum variance control of linear time-varying systems

    Publication Year: 2002 , Page(s): 111 - 116
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (574 KB)  

    The problem of generalised minimum variance control of linear time-varying discrete-time systems is studied. Standard time-varying controlled autoregressive moving average models are considered, and the sum of plant output tracking error variance plus a penalty term on plant input is chosen as the cost functional. The time-varying controller described is able to minimise the generalised tracking e... View full abstract»

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  • Derivative filter is an integral part of PID design

    Publication Year: 2002 , Page(s): 41 - 45
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (571 KB)  

    A PID controller is a second-order controller, and as such involves four parameters. However, many available tuning methods design only three parameters, and then use a default choice for the derivative filter factor. In this paper it is pointed out that for a PID controller of series form a default value for the derivative filter makes some sense, since it corresponds to a lead-lag controller. Fo... View full abstract»

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  • Minimum energy control subject to output constraints: numerical approach

    Publication Year: 2002 , Page(s): 105 - 110
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (499 KB)  

    The aim is to characterise the minimum energy control that steers a parabolic system to a final state between two prescribed functions only on a subregion of the evolution system domain. This problem is solved by two approaches. The first uses the Lagrangian multiplier method, and the second is based on subdifferential techniques. An algorithm is also given for the computation of the optimal contr... View full abstract»

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  • Design of PID controllers based on constrained optimisation

    Publication Year: 2002 , Page(s): 32 - 40
    Cited by:  Papers (34)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (746 KB)  

    A new design method for PID controllers is presented, based on optimisation of load disturbance rejection with constraints on robustness to model uncertainties. The design also delivers parameters to deal with measurement noise and set-point response. Thus, the formulation of the design problem captures four essential aspects of industrial control problems, leading to a constrained optimisation pr... View full abstract»

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  • Towards autonomous PI control satisfying classical robustness specifications

    Publication Year: 2002 , Page(s): 26 - 31
    Cited by:  Papers (5)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (574 KB)  

    PID or three-term controller tuning in industry often uses a relay experiment to find the system ultimate data, followed by the use of PID coefficient calculation rules. This paper first reports a new, flexible and more accurate method of finding system frequency response data, including the system ultimate data. It is then demonstrated how this new identification module can be used in closed loop... View full abstract»

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  • Restricted structure controller tuning and performance assessment

    Publication Year: 2002 , Page(s): 8 - 16
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (761 KB)  

    A typical process plant includes hundreds of PID controllers and many of these require tuning. The economic operation of process plant and machinery controls depends upon the controller structure and the choice of tuning variables. The problem of defining a benchmark cost, which relates to financial requirements and involves realistic control activity, is considered. The computation of the cost, f... View full abstract»

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