Design of self-repairing digital PID controllers for non-square multivariable plants

Othman, MZ 1989, Design of self-repairing digital PID controllers for non-square multivariable plants , PhD thesis, University of Salford.

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The complexity of today's multivariable plants gives rise to the need for sophisticated control systems to ensure high-performance operation whilst maintaining high system integrity. The integrity of such systems is to be interpreted as the sensitivity of high-performance control systems to failure and their capability for reconfiguration if necessary. Thus, the issue of self-repairing control systems becomes practically very important. Indeed, besides simplicity and practical realism, the associated controller of the self-repairing control system should avoid the need for detailed mathematical models of the plant and should utilise only data obtained from direct input-output measurements. Moreover, the self-repairing controller should have the capability of altering its control law to promote plant survivability in the face of severe plant-parameter variations characterised by actuator failure. It is accordingly shown in this thesis that self-repairing digital control systems can be designed by extending the domain of applicability of the digital PID controller introduced by Porter et al (1985) so as to incorporate non-square plants subject to actuator failure. This demonstration is effected by classifying the time-domain characteristics of non-square linear multivariable plants using step-response matrices. These characteristics are used firstly to design non-adaptive signal-following systems for non-square linear multivariable plants, and then to design non-adaptive model-folio wing systems for such plants. In order to produce self-repairing controllers, these non-adaptive controllers are then rendered adaptive so that actuator failures can be tolerated. The effectiveness of such self-repairing digital controllers is illustrated by designing digital PID controllers for a three-input/two-output gas turbine, the three-input/two-output X-29 technology demonstrator aircraft, and a four-input/two-output two-link manipulator subject to actuator failure.

Item Type: Thesis (PhD)
Contributors: Porter, B (Supervisor)
Schools: Schools > School of Computing, Science and Engineering
Depositing User: Institutional Repository
Date Deposited: 02 Jul 2021 14:34
Last Modified: 04 Aug 2022 11:23

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