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IEE Proceedings D - Control Theory and Applications

Issue 2 • Date March 1991

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Displaying Results 1 - 14 of 14
  • Analysis of singular bilinear systems using Walsh functions

    Publication Year: 1991, Page(s):89 - 92
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (359 KB)

    The use of Walsh functions to analyse singular bilinear systems is investigated. It is shown that the nonlinear implicit differential system equation may be converted to a set of linear algebraic Lyapunov equations to be solved iteratively for the coefficients of the semistate x(t) in terms of the Walsh basis functions. Solution of the iterative algorithm is uniformly convergent to the exact solut... View full abstract»

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  • Integral equation approach to joint state and parameter estimation in continuous-time MIMO systems

    Publication Year: 1991, Page(s):93 - 102
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (753 KB)

    Shows how the problem of simultaneous estimation of the continuous-time (CT) model parameters and the state of a multi-input multi-output (MIMO) system can be decoupled into a set of multi-input single-output (MISO) subproblems. It then shows how the MISO problem can be solved following an integral equation approach with a common denominator (CD) model. The key observation is that the initial cond... View full abstract»

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  • Sequential design of multivariable control systems

    Publication Year: 1991, Page(s):103 - 110
    Cited by:  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (646 KB)

    The sequential return difference method is a technique for the design of multivariable control systems in which the individual loops are designed in sequence, using classical tools. In essence, this method implies that at each stage only one loop of a loop gain matrix is closed. The method of this paper, in contrast, takes the view that at each stage only one loop remains to be closed, and uses th... View full abstract»

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  • Refinements of the Ziegler-Nichols tuning formula

    Publication Year: 1991, Page(s):111 - 118
    Cited by:  Papers (38)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (659 KB)

    The accuracy of the Ziegler-Nichols tuning formula is reviewed in the context of PID and PI autotuning. For PID autotuning, it is shown that, for excessive overshoot in the set-point response, set-point weighting can reduce the overshoot to specified values, and the original Ziegler-Nichols tuning formula can be retained. It is also shown that set-point weighting is superior to the conventional so... View full abstract»

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  • Effects of lag controllers on transient response

    Publication Year: 1991, Page(s):119 - 122
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (299 KB)

    It has long been accepted that the addition of a lag controller to a linear, closed-loop system will reduce the steady-state error without appreciably affecting the transient response. Using a theoretical analysis supported by examples, the paper demonstrates that this is not the case. In fact, the settling time and the percentage overshoot will be affected significantly whenever a lag controller ... View full abstract»

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  • Composite dynamic and steady-state approach to stochastic optimising control of steady-state systems with output dependent constraints

    Publication Year: 1991, Page(s):123 - 138
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1473 KB)

    A stochastic formulation for steady-state optimising control problems with output dependent constraints is proposed and analysed. In this formulation, the output dependent inequality constraints, which become stochastic due to the randomness of the output vector, are characterised by their mean values. A novel approach, that makes full use of dynamic and steady-state information on the process whe... View full abstract»

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  • Iterative learning control method for discrete-time dynamic systems

    Publication Year: 1991, Page(s):139 - 144
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (490 KB)

    An iterative learning control algorithm is presented for a class of linear discrete-time dynamic systems with unknown but periodic parameters. Then a sufficient condition for convergency of the iterative algorithm is provided. It is also shown that the result can be extended to a class of nonlinear unknown systems. To show the effectiveness of the algorithms, two examples are given.<> View full abstract»

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  • Constrained variance design for bilinear stochastic continuous systems

    Publication Year: 1991, Page(s):145 - 150
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (541 KB)

    The aim of the paper is to find a compatible covariance matrix which satisfies the variance constraints on the outputs, then to use the state covariance assignment theory to determine the linear state feedback gain matrix that will meet the variance constraints on the inputs. The paper introduces a theory for the control of the state covariance of time-invariant bilinear stochastic continuous syst... View full abstract»

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  • New bound for the stability margin of linear continuous systems

    Publication Year: 1991, Page(s):151 - 152
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (179 KB)

    A new method for estimating the stability margin of linear continuous systems based on impulse response measurements is presented. The proposed method requires numerical integration of the impulse response data and has advantages over existing techniques.<> View full abstract»

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  • Adaptive control of a single-link flexible manipulator with unknown load

    Publication Year: 1991, Page(s):153 - 159
    Cited by:  Papers (3)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (649 KB)

    A new adaptive control scheme for the tip position control of a single-link flexible manipulator handling unknown loads and its experimental as well as simulative verification are presented. The scheme essentially comprises a least-squares identification algorithm and a self-tuning pole placement controller. A novel recursive control algorithm with parameter estimate resetting is developed to elim... View full abstract»

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  • Observations-weighted optimal control of a class of nonlinear systems

    Publication Year: 1991, Page(s):160 - 164
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (373 KB)

    A canonical ARMAX model for nonlinear systems is introduced. An observations-weighted optimal controller is then derived which provides nonlinear compensation and minimises a cost function including tracking error and control signal terms. A stabilising optimal control solution is obtained under the assumed conditions.<> View full abstract»

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  • Eigenstructure assignment in high-gain feedback systems

    Publication Year: 1991, Page(s):165 - 171
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (581 KB)

    Using the two-time scale property of a high-gain feedback system, the set of closed-loop eigenvectors which can be assigned by linear state-variable feedback corresponding to a prescribed set of eigenvalues is characterised in the paper. Algorithms to compute the feedback matrix for assigning eigenvalues and eigenvectors are described. The above algorithmic procedure for eigenstructure assignment ... View full abstract»

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  • New method of robust pole assignment by output feedback

    Publication Year: 1991, Page(s):172 - 176
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (379 KB)

    A discussion is devoted to the robust pole assignment problem by output feedback in linear time-invariant multivariable system. The paper gives a design method, demonstrating the theorems concerned and illustrating, by examples, the application of this method.<> View full abstract»

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  • Multivariable self-tuning regulator for load frequency control system with interaction of voltage on load demand

    Publication Year: 1991, Page(s):177 - 183
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (518 KB)

    Presents a new method of designing a multivariable self-tuning regulator for a load frequency control system with the inclusion of interaction of voltage on load demand. The self-tuning controller through speed governor control and excitation control is derived by defining a cost function with a term for presenting the constraints on the control effort, and then by minimising it with respect to th... View full abstract»

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