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Volume 131
Issue 4
IEE Proceedings D (Control Theory and Applications)
Volume 131, Issue 4, July 1984
Volumes & issues:
Volume 131, Issue 4
July 1984
Optimal controllers for bank-to-turn CLOS guidance
- Author(s): D.J. Roddy ; G.W. Irwin ; H. Wilson
- Source: IEE Proceedings D (Control Theory and Applications), Volume 131, Issue 4, p. 109 –116
- DOI: 10.1049/ip-d.1984.0020
- Type: Article
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109
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Linear quadratic optimal control theory is applied to the problem of bank-to-turn control in a CLOS guidance system. Both stationary and moving targets are treated, and the trade-off between controller complexity and autopilot realisability examined. The optimality of conventional control ideas is assessed. Finally, simulation results using a practical autopilot model confirm that these new controllers give improved guidance accuracy and reduced susceptibility to pitch-yaw crosscoupling.
Online adaptive control of a fermentation process
- Author(s): D. Williams ; P. Yousefpour ; B.H. Swanick
- Source: IEE Proceedings D (Control Theory and Applications), Volume 131, Issue 4, p. 117 –124
- DOI: 10.1049/ip-d.1984.0021
- Type: Article
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p.
117
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The feasibility of an adaptive controller for the fermentation of baker's yeast is investigated. A simplified model of the process was developed to aid the design of the parameter estimator and multivariable controller. Experiments were performed on a small-scale, fully instrumented fermenter under the control of the online real-time adaptive package. Results are presented to show the successful performance of the adaptive technique achieved by controlling various process variables, in both SIMO and MIMO configurations. The work indicates that the application of the adaptive technique compares favourably with semiautomated control techniques while providing great opportunities for enhancement and thereby superior control. It has been found necessary to omit a considerable amount of the biological detail surrounding the fermentation process so that attention can be focussed upon the adaptive-control applications.
CAD for the design and evaluation of industrial control systems
- Author(s): D.J. Sandoz
- Source: IEE Proceedings D (Control Theory and Applications), Volume 131, Issue 4, p. 125 –139
- DOI: 10.1049/ip-d.1984.0022
- Type: Article
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125
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The paper reviews the current state of development of a CAD facility for the design and evaluation of industrial process control systems. The facility is generalised to support multiple control systems and to coordinate their operations. The individual control systems may involve compensation for interaction, disturbance and time delay. The design procedures use least-squares analysis for identification, dynamic programming for control system design and simulation for evaluation of performance. The facility permits a systematic approach for building sets of hierarchical controllers with the objective of supervising the operation of complex processes. Design studies relating to real plant data are presented.
Recursive smoothing for discrete-time systems as a filtering problem
- Author(s): R. Gessing
- Source: IEE Proceedings D (Control Theory and Applications), Volume 131, Issue 4, p. 140 –141
- DOI: 10.1049/ip-d.1984.0023
- Type: Article
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140
–141
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It is shown that the problem of recursive smoothing of the past states for discrete-time linear systems can be transformed to a filtering problem by introducing an enlarged state and modifying the system equations. The smoothing equations are then obtained from Kalman filter equations. Equations for the fixed-point time smoothing problem results directly from the filter equations.
A simple adaptive observer for a class of multi-output systems
- Author(s): N. Hori ; P.N. Nikiforuk ; K. Kanai
- Source: IEE Proceedings D (Control Theory and Applications), Volume 131, Issue 4, p. 142 –145
- DOI: 10.1049/ip-d.1984.0024
- Type: Article
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142
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A method is presented for designing a discrete adaptive observer for a class of multivariable systems, the orders of which are an integer multiple of the number of the outputs. Using the block canonical expression of the multivariable systems proposed by Tsay and Shieh, this design method is shown to be as simple as those for single-input single-output systems.
Online optimisation of the free parameters in discrete adaptive control systems
- Author(s): M. de la Sen
- Source: IEE Proceedings D (Control Theory and Applications), Volume 131, Issue 4, p. 146 –157
- DOI: 10.1049/ip-d.1984.0025
- Type: Article
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146
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A method is proposed for improving the adaptation transients in discrete-time adaptive systems. The method is based upon the well known fact that usually some of the parameters entering the adaptation gain can be freely chosen within certain bounds while maintaining the stability of the whole system. The philosophy of the method is to interpret these parameters as additional inputs to the adaptive control systems to be computed online in order to minimise a quadratic criterion of the tracking error. As an intermediate step, an equivalent time-varying and near-linear system, which is an approximate model for the whole system, is derived in order to compute a bang-bang (or eventually linear) mode suboptimal control. The resulting control is finally translated into modifications of the parameters entering the adaptation gain updating equation.
Design of optimal observers for structural control
- Author(s): Mohamed Abdel-Rohman
- Source: IEE Proceedings D (Control Theory and Applications), Volume 131, Issue 4, p. 158 –163
- DOI: 10.1049/ip-d.1984.0026
- Type: Article
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158
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An easy and fast approach based on the pole assignment method is given in order to design the optimal observer for high-order structural systems. It is shown that the optimal observer is not only the one which is characterised by an optimal gain; the optimal locations of the sensors and their types, the optimal locations of the control forces and their optimal design are also important factors in the design of the optimal observer used to control flexible structures. It has been found that the suitable sensor type and its location differ from one structure to another, depending on the natural frequencies and mode shapes of the structure. Two numerical examples are given to illustrate the application of this method.
Book review: Measurement and Control of Liquid Level
- Author(s): B.E. Jones
- Source: IEE Proceedings D (Control Theory and Applications), Volume 131, Issue 4, page: 164 –164
- DOI: 10.1049/ip-d.1984.0027
- Type: Article
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