{"id":{"repo_id":"salford","oai_identifier":"oai:salford-repository.worktribe.com:1339113"},"canonical_url":"https://search.dev.ndltd.org/etd/salford/oai:salford-repository.worktribe.com:1339113","repository":{"repo_id":"salford","name":"U. of Salford","base_url":"https://salford-repository.worktribe.com/oaiprovider"},"display":{"title":"Design of self-repairing digital PID controllers for non-square multivariable plants","abstract":"The complexity of today's multivariable plants gives rise to the need for sophisticated controlsystems to ensure high-performance operation whilst maintaining high system integrity. Theintegrity of such systems is to be interpreted as the sensitivity of high-performance controlsystems to failure and their capability for reconfiguration if necessary. Thus, the issue ofself-repairing control systems becomes practically very important. Indeed, besides simplicityand practical realism, the associated controller of the self-repairing control system shouldavoid the need for detailed mathematical models of the plant and should utilise only dataobtained from direct input-output measurements. Moreover, the self-repairing controllershould have the capability of altering its control law to promote plant survivability in theface of severe plant-parameter variations characterised by actuator failure.It is accordingly shown in this thesis that self-repairing digital control systems can bedesigned by extending the domain of applicability of the digital PID controller introducedby 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-squarelinear multivariable plants using step-response matrices. These characteristics are used firstlyto 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 toproduce self-repairing controllers, these non-adaptive controllers are then rendered adaptiveso that actuator failures can be tolerated.The effectiveness of such self-repairing digital controllers is illustrated by designing digitalPID controllers for a three-input/two-output gas turbine, the three-input/two-output X-29technology demonstrator aircraft, and a four-input/two-output two-link manipulator subjectto actuator failure.","abstract_html":"The complexity of today's multivariable plants gives rise to the need for sophisticated controlsystems to ensure high-performance operation whilst maintaining high system integrity. Theintegrity of such systems is to be interpreted as the sensitivity of high-performance controlsystems to failure and their capability for reconfiguration if necessary. Thus, the issue ofself-repairing control systems becomes practically very important. Indeed, besides simplicityand practical realism, the associated controller of the self-repairing control system shouldavoid the need for detailed mathematical models of the plant and should utilise only dataobtained from direct input-output measurements. Moreover, the self-repairing controllershould have the capability of altering its control law to promote plant survivability in theface of severe plant-parameter variations characterised by actuator failure.It is accordingly shown in this thesis that self-repairing digital control systems can bedesigned by extending the domain of applicability of the digital PID controller introducedby 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-squarelinear multivariable plants using step-response matrices. These characteristics are used firstlyto 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 toproduce self-repairing controllers, these non-adaptive controllers are then rendered adaptiveso that actuator failures can be tolerated.The effectiveness of such self-repairing digital controllers is illustrated by designing digitalPID controllers for a three-input/two-output gas turbine, the three-input/two-output X-29technology demonstrator aircraft, and a four-input/two-output two-link manipulator subjectto actuator failure.","abstract_has_math":false,"creators":["Othman, MZ"],"institution":null,"degree_name":null,"degree_level":"Doctoral (Level 8)","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1989,"date_issued":"1989","date_published":"1989","updated_at":"2026-07-24T04:26:14Z","subjects":[],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["oai:salford-repository.worktribe.com:1339113"],"render_values":[{"text":"oai:salford-repository.worktribe.com:1339113","href":null,"code":true}]}]},"links":{"outbound_url":null,"outbound_label":null,"outbound_source":null},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.sponsor","label":"Sponsor","values":["University of Salford"]},{"key":"dc:creator","label":"Author","values":["Othman, MZ"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["1989-05-01"]},{"key":"dc:date.issued","label":"Date","values":["1989"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://salford-repository.worktribe.com/output/1339113"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["Doctoral (Level 8)"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["oai:salford-repository.worktribe.com:1339113"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://salford-repository.worktribe.com/file/1339113/1/5602809486.pdf"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The complexity of today's multivariable plants gives rise to the need for sophisticated controlsystems to ensure high-performance operation whilst maintaining high system integrity. Theintegrity of such systems is to be interpreted as the sensitivity of high-performance controlsystems to failure and their capability for reconfiguration if necessary. Thus, the issue ofself-repairing control systems becomes practically very important. Indeed, besides simplicityand practical realism, the associated controller of the self-repairing control system shouldavoid the need for detailed mathematical models of the plant and should utilise only dataobtained from direct input-output measurements. Moreover, the self-repairing controllershould have the capability of altering its control law to promote plant survivability in theface of severe plant-parameter variations characterised by actuator failure.It is accordingly shown in this thesis that self-repairing digital control systems can bedesigned by extending the domain of applicability of the digital PID controller introducedby 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-squarelinear multivariable plants using step-response matrices. These characteristics are used firstlyto 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 toproduce self-repairing controllers, these non-adaptive controllers are then rendered adaptiveso that actuator failures can be tolerated.The effectiveness of such self-repairing digital controllers is illustrated by designing digitalPID controllers for a three-input/two-output gas turbine, the three-input/two-output X-29technology demonstrator aircraft, and a four-input/two-output two-link manipulator subjectto actuator failure."]},{"key":"dc:title","label":"Title","values":["Design of self-repairing digital PID controllers for non-square multivariable plants"]}]}],"canonical_facts":{"dc:contributor.sponsor":["University of Salford"],"dc:creator":["Othman, MZ"],"dc:date":["1989-05-01"],"dc:date.issued":["1989"],"dc:description.abstract":["The complexity of today's multivariable plants gives rise to the need for sophisticated controlsystems to ensure high-performance operation whilst maintaining high system integrity. Theintegrity of such systems is to be interpreted as the sensitivity of high-performance controlsystems to failure and their capability for reconfiguration if necessary. Thus, the issue ofself-repairing control systems becomes practically very important. Indeed, besides simplicityand practical realism, the associated controller of the self-repairing control system shouldavoid the need for detailed mathematical models of the plant and should utilise only dataobtained from direct input-output measurements. Moreover, the self-repairing controllershould have the capability of altering its control law to promote plant survivability in theface of severe plant-parameter variations characterised by actuator failure.It is accordingly shown in this thesis that self-repairing digital control systems can bedesigned by extending the domain of applicability of the digital PID controller introducedby 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-squarelinear multivariable plants using step-response matrices. These characteristics are used firstlyto 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 toproduce self-repairing controllers, these non-adaptive controllers are then rendered adaptiveso that actuator failures can be tolerated.The effectiveness of such self-repairing digital controllers is illustrated by designing digitalPID controllers for a three-input/two-output gas turbine, the three-input/two-output X-29technology demonstrator aircraft, and a four-input/two-output two-link manipulator subjectto actuator failure."],"dc:identifier":["oai:salford-repository.worktribe.com:1339113"],"dc:identifier.uri":["https://salford-repository.worktribe.com/file/1339113/1/5602809486.pdf"],"dc:language":["en"],"dc:relation.isreferencedby":["https://salford-repository.worktribe.com/output/1339113"],"dc:title":["Design of self-repairing digital PID controllers for non-square multivariable plants"],"dc:type":["Thesis"],"dc:type.qualificationlevel":["Doctoral (Level 8)"]},"updated_at":"2026-07-24T04:26:14Z"}