Browsing by Author "Lee, HK"

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Asymptotic stability analysis for collocated direct output feedback control of flexible systems
(1997-12-01)
Lee, HK
;
Chen, ST
;
Lee, AC
;
機械工程學系
;
Department of Mechanical Engineering
This paper presents a study of asymptotic stability for the control of flexible systems. It shows that when the controller structure is a collocated direct output feedback design with positive definite feedback gain, the number and placement of sensors and actuators are the only factors required to determine necessary and sufficient conditions to ensure closed-loop asymptotic stability. The minimum number of control devices required is dependent on the maximum number of multiple eigenvalues. The positioning of the control devices is restricted by checking several simple subsidiary rank conditions.
Optimal control of vibration suppression in flexible systems via dislocated sensor/actuator positioning
(1996-09-01)
Lee, HK
;
Chen, ST
;
Lee, AC
;
交大名義發表
;
機械工程學系
In this study, we present a new controller design method that not only effectively suppresses vibration in flexible systems, but also has the ability to save control energy. The proposed method allows integrated determination of sensor/actuator locations and feedback gain by minimizing the sum of the integral flexible system energy and the integral control energy. Also, the cost function is characterized by an effective representation of control systems, and is determined via an efficient solution of the Lyapunov equation. The optimization problem is solved by a recursive quadratic programming algorithm. The feasibility of applying this method to a simple and flexible structure confirms the direct relationship between our optimization criterion and effectiveness in vibration suppression. Copyright (C) 1996 Published by Elsevier Science Ltd