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Volume 127
Issue 4
IEE Proceedings D (Control Theory and Applications)
Volume 127, Issue 4, July 1980
Volumes & issues:
Volume 127, Issue 4
July 1980
Bias of frequency-response estimates in closed-loop systems
- Author(s): J.L. Douce
- Source: IEE Proceedings D (Control Theory and Applications), Volume 127, Issue 4, p. 149 –152
- DOI: 10.1049/ip-d.1980.0022
- Type: Article
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The paper considers the bias in estimates of the frequency-response function of the forward element in linear, time-invariant feedback systems, subjected to a disturbance in the forward loop. A very simple criterion is developed which determines whether or not an estimate will be subjected to bias. This criterion is used to examine particular examples. Simulation results verify the main conclusion
Inversion of uniform rank multivariable systems
- Author(s): D.H. Owens
- Source: IEE Proceedings D (Control Theory and Applications), Volume 127, Issue 4, p. 153 –154
- DOI: 10.1049/ip-d.1980.0023
- Type: Article
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–154
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A simple numerical procedure is presented for the inversion of a system S(A, B, C) satisfying the constraints CAi−1B=0, 1 ≤ i ≤ k – 1, and CAk−1B ¬ 0 for some k ≥ 1. The results generalise the work of Kouvaritakis for the case of k = 1.
Discrete double-sided Karhunen-Loève expansion
- Author(s): K.V.M. Fernando and H. Nicholson
- Source: IEE Proceedings D (Control Theory and Applications), Volume 127, Issue 4, p. 155 –160
- DOI: 10.1049/ip-d.1980.0024
- Type: Article
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The double-sided form of the Karhunen-Loève expansion based on the singular value decomposition of matrices is developed. It has applications in data analysis, contraction and prediction in two-dimensional processes.
Online computer control of pH in an industrial process
- Author(s): O.L.R. Jacobs ; P.F. Hewkin ; C. While
- Source: IEE Proceedings D (Control Theory and Applications), Volume 127, Issue 4, p. 161 –168
- DOI: 10.1049/ip-d.1980.0025
- Type: Article
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The paper reports on a collaborative, university/industry project to investigate the contribution which modern control technology can make to a difficult industrial problem: pH control. A digital computer was interfaced for online neutralisation of effluent from a full-scale production process. The investigation consisted of trials, some of them extended, using the computer to control neutralisation according to various algorithms and to monitor performance, and of simulation studies. Algorithms investigated include p.i.d., self-tuning control, and optimal-k-step-ahead (o.k.) adaptive control. The paper summarises work to date which leads to the conclusion that an online digital computer can contribute substantially to pH control and that o.k. control is a promising candidate for general-purpose feedback within a configuration of combined feedbadk, feeciforwardancilineansation
Nonlinear control of bilinear systems
- Author(s): I. Derese and E.J. Noldus
- Source: IEE Proceedings D (Control Theory and Applications), Volume 127, Issue 4, p. 169 –175
- DOI: 10.1049/ip-d.1980.0026
- Type: Article
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169
–175
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The dual problems of designing state observers and state-feedback laws for bilinear systems are considered. Subsequently, the synthesis of dynamic controllers using state observers is discussed. In each case, global asymptotic stability of the complete system is pursued using a Lyapunov approach. The design is essentially reduced to finding a class of positive-definite matrices satisfying a given set of equality and inequality constraints. To each matrix satisfying these constraints there corresponds a class of controllers which globally stabilise the closed-loop system
Book review: Systems: Decomposition, Optimisation and Control
- Author(s): M.J. Denham
- Source: IEE Proceedings D (Control Theory and Applications), Volume 127, Issue 4, page: 176 –176
- DOI: 10.1049/ip-d.1980.0027
- Type: Article
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176
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On the sensitivity of a system compensated by the inverse Nyquist array
- Author(s): T.G. Koussiouris
- Source: IEE Proceedings D (Control Theory and Applications), Volume 127, Issue 4, p. 177 –187
- DOI: 10.1049/ip-d.1980.0028
- Type: Article
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177
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Bounds for the elements of the sensitivity matrix S(jω) of a system compensated by the inverse Nyquist array method will be found and a graphical technique will be presented for determining areas in the complex plane in which the diagonal elements Sii(jω) of S(jω) lie. A graphical method is also described for determining frequency intervals in which the norm ‖S(jω)‖-(or ‖S(jω)‖1) of the sensitivity matrix is less than one. The application of the proposed techniques is illustrated in two examples
Erratum: Analysis and synthesis of matrix transfer functions using the new block-state equations in block-tridiagonal forms
- Author(s): L.S. Shieh and A. Tajvari
- Source: IEE Proceedings D (Control Theory and Applications), Volume 127, Issue 4, page: 187 –187
- DOI: 10.1049/ip-d.1980.0029
- Type: Article
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Erratum: Frequency response identification of structure of nonlinear systems
- Author(s): Y.P. Singh and S. Subramanian
- Source: IEE Proceedings D (Control Theory and Applications), Volume 127, Issue 4, page: 187 –187
- DOI: 10.1049/ip-d.1980.0030
- Type: Article
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Book review: Digital and Kalman Filtering
- Author(s): P.E. Wellstead
- Source: IEE Proceedings D (Control Theory and Applications), Volume 127, Issue 4, page: 188 –188
- DOI: 10.1049/ip-d.1980.0031
- Type: Article
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p.
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