Coprime factorization controller reduction using a new set of invariants새로운 불변항을 이용한 소인수분해 제어기 축소

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dc.contributor.advisorTahk, Min-Jea-
dc.contributor.authorSun, Byung-Chan-
dc.description학위논문(박사) - 한국과학기술원 : 항공우주공학과, 1997.8, [ viii, 125 p. ]-
dc.description.abstractA new controller reduction scheme using a new set of similarity invariants is proposed for LQG controller. The new set of invariants is defined by modifying the existing ones with two real constants. A modified balanced realization is suggested as a basic algorithm. Through case studies according to the two real constants, it is shown that a reduced-order controller which has good performance can be obtained by appropriately selecting only one constant. Reasonable bound for the constant is also given. The stability and performance of the closed-loop system with the reduced-order controller obtained by the proposed method are investigated. Some examples show that the proposed method is very attractive in terms both of stability and of accuracy of the closed-loop approximation. The new LQG-controller reduction scheme is extended to general types of coprime factorization controller reduction problem : non-weighted coprime factor controller reduction, constant-weighted coprime factor controller reduction, stability-weighted coprime factor controller reduction, and robustness-preserving coprime factor controller reduction. For the robustness-preserving controller reduction, robust stability conditions of the closed-loop system with a reduced-order controller are newly derived. Through a example, it is shown that the proposed coprime factor controller reduction methods using the new set of invariants yield reduced-order controllers which have both good closed-loop stability and good robustness. For general robustness problems, the relations between coprime factor perturbation and general types of structural perturbations are also derived.eng
dc.subjectRobust stability condition-
dc.subjectFrequency-weighted controller reduction-
dc.subjectSimilarity invariants-
dc.subjectCoprime factor controller reduction-
dc.subjectRobustness-preserving controller reduction-
dc.subject강인성 보존 제어기 축소-
dc.subject강인안정성 조건-
dc.subject주파수 가중 제어기 축소-
dc.subject유사변환 불변항-
dc.subject소인수분해 제어기 축소-
dc.titleCoprime factorization controller reduction using a new set of invariants-
dc.title.alternative새로운 불변항을 이용한 소인수분해 제어기 축소-
dc.description.department한국과학기술원 : 항공우주공학과, -
dc.contributor.localauthorTahk, Min-Jea-
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