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자기부상 시스템의 강인한 제어기 설계에 관한 연구(I) -시뮬레이션을 중심으로-
양주호,김창화,정석권,김영복 한국마린엔지니어링학회 1995 한국마린엔지니어링학회지 Vol.19 No.3
The magnetic levitation system has great advantages, such as little friction, no lubrication no noise and so on. The magnetic levitation system need a stabilizing controller because it is a unstable system in natural. This paper presents the robust stabilizing controller design of the magnetic levitation system. The controller which is designed in this paper by $H_{infty}$ control theory is robust servo controller which has zero offset in spite of the model uncertainties. The validity of controller was investigater through the response simulation. In the future, we will use the result of this study at the actual magnetic levitation system.
$H_{\infty}$ 제어기법을 이용한 저속디젤기관의 속도제어
양주호,정병건 한국마린엔지니어링학회 1993 한국마린엔지니어링학회지 Vol.17 No.5
In 1980's to 1990's the marine propulsion diesel engines have been developed into lower speed and longer stroke for the energy saving(small S.F.O.C.). As these new trends the convetional mechnical-hydraulic governors were not adapted to the new requirements and the digital governors have been adopted in the marine use. The digital governors usually use the control algorithms such as the PID control, optimal control, adaptive control and etc. While the engine has delay time and parameter variations these control algorithms have difficulty in considering the stability and the robustness for the model uncertainty. In this study, the $H_{\infty}$ controller design method are applied to the speed control of the low speed marine diesel engine. By comparison the $H_{\infty}$ control results with the PID control results, the validity of the $H_{\infty}$ controller under the delay time and parameter variations is confirmed.
2자유도 제어기법에 의한 자기 부상계의 센서리스 실현에 관한 연구
양주호 한국마린엔지니어링학회 1998 한국마린엔지니어링학회지 Vol.22 No.6
In this paper, we present a magnetic levitation system which has not a gap sensor with sensor-less realization and stabilizing controller design. For measuring gap between magnet and levitated object we propose a gap sensorless method and adop two-degree-of-freedom controller for robust-ness and performence of the magnetic levitation system. From time responeses we confirm that the proposed sensorless method which can be applied to magnetic levitation system. Also the designed stabilizing controller has good disturbance rejection and reference tracking performance.