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이문노,신진호,김성우 한국소음진동공학회 2003 한국소음진동공학회 논문집 Vol.13 No.11
This paper presents a systematic method measuring a velocity disturbance to design the robust seek loop system of optical disk drives. The velocity disturbance caused by the rotation of a disk has a greater influence on the performance of the seek control loop as the rotational speed increases. Thus, it needs to measure the extent of the velocity disturbance and design the seek control loop based on the measured data. The measurement method of the velocity disturbance is a real-time . method using a measurable velocity and a velocity controller output and is a robust method considering actuator uncertainties. The loop gain adjustment algorithm is introduced to compensate for the actuator uncertainties. The proposed method is implemented by an experimental digital system and is evaluated through an experiment.
유전자 알고리듬을 이용한 강인 미동 탐색 제어기의 설계
이문노(Moonnoh Lee),진경복(Kyoung Bog Jin) 한국소음진동공학회 2015 한국소음진동공학회 논문집 Vol.25 No.5
This paper deals with a robust fine seek controller design problem with multiple constraints using a genetic algorithm. A robust H∞ constraint is introduced to attenuate effectively velocity disturbance caused by the eccentric rotation of the disk. A weighting function is optimally selected based on the estimation of velocity disturbance and the estimated minimum velocity loop gain. A robust velocity loop constraint is considered to minimize the variances of the velocity loop gain and bandwidth against the uncertainties of fine actuator. Finally, a robust fine seek controller is obtained by solving a genetic algorithm with an LMI condition and an appropriate objective function. The proposed controller design method is applied to the fine seek control system of a DVD recording device and is evaluated through the experimental results.
안정적인 트랙 탐색 제어를 위한 트랙킹 게인 업 제어기 설계
이문노(Moonnoh Lee) 한국정보기술학회 2015 한국정보기술학회논문지 Vol.13 No.7
To control effectively the vibration of tracking actuator occurring after a track seek control, it is necessary to implement a tracking gain-up control over a period of time. To this end, a robust H∞ constraint is considered to attenuate tracking disturbance and vibration of tracking actuator and a pole placement constraint is introduced to assure a desired transient response against the vibration of tracking actuator. To design a tracking gain-up controller satisfying multiple constraints, this paper introduces objective functions associated with tracking gain-up extreme loop functions. Accordingly, the tracking gain-up controller design problem can be formulated as a constrained optimization problem with appropriate objective functions and a tracking gain-up controller is optimally designed by applying a proposed genetic algorithm. The proposed tracking gain-up controller design method is applied to the track seek control system of a DVD recording device and is evaluated through the experimental results.
이문노(Moonnoh Lee) 한국정보기술학회 2017 한국정보기술학회논문지 Vol.15 No.10
This paper presents a robust optimal controller design method for the stable CLV track-following. In CLV control mode, a periodic disturbance of uncertain frequency is generated to the track-following system and it deteriorates the tracking performance. To acquire the stable CLV tracking performance, we introduce a tracking virtual model with a controller including the dynamics corresponding to the uncertain frequency and design a tracking controller which diminishes the difference of loop gain between the tracking virtual model and the track-following system. Besides, we consider an objective function minimizing the change of the control bandwidth and phase margin to maintain constantly the tracking performance against the actuator uncertainty. Accordingly, the proposed controller design problem can be formulated as a constrained optimization problem with appropriate objective functions. The proposed controller design method is applied to a DVD track-following system in CLV control mode and is evaluated through the compared results with a robust H∞ design method.
유전자 알고리즘과 LMI 설계 방법을 이용한 강인 제어기의 설계
이문노(Moonnoh Lee),이홍규(Hong Kyu Lee) 제어로봇시스템학회 2011 제어·로봇·시스템학회 논문지 Vol.17 No.7
This paper presents a controller design method for a robust control problem with multiple constraints using genetic algorithms and LMI design method. A robust H∞ constraint with loop shaping and pole placement is used to address disturbance attenuation with error limits and desired transient specifications, in spite of the plant uncertainties and disturbances. In addition, a loop gain constraint is considered so as not to enlarge the loop gain unnecessarily. The robust H∞ constraint and pole placement constraint can be expressed in terms of two matrix inequalities and the loop gain constraint can be considered as an objective function so that genetic algorithms can be applied. Accordingly, a robust controller can be obtained by integrating genetic algorithms with LMI approach. The proposed controller design method is applied to a track-following system of an optical disk drive and is evaluated through simulation results.
안정적인 트랙 추종 제어를 위한 강인 최적 제어기 설계
이문노(Moonnoh Lee) 한국정보기술학회 2014 한국정보기술학회논문지 Vol.12 No.11
This paper proposes a robust optimal tracking controller design algorithm for the track-following control system with actuator uncertainties and vibration disturbance. To maintain the stable track-following control in high speed rotations, the track-following system should secure enough vibration attenuation, transient performance, tracking loop gain, phase margin, etc. For this end, a robust H<SUB>∞</SUB> constraint and pole placement constraint are utilized to acquire necessary tracking control performances in spite of vibration disturbance, disk defects, and external shock. A tracking loop constraint is introduced to minimize the variations of phase margin and loop gain at vibration frequency against the actuator uncertainties. Accordingly, a robust optimal tracking controller can be designed by applying a genetic algorithm and LMI design method. The proposed tracking control algorithm is applied to the track-following system of an optical recording drive and is evaluated through experimental results.
속도 성분의 진동 외란이 있는 미동 탐색 제어 시스템의 강인 제어기 설계 방법
이문노(Lee, Moon-Noh),신진호(Shin, Jin-Ho),김성우(Kim, Seong-Woo) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.9
This paper present a robust controller design method based on the estimation of velocity disturbance to construct a robust fine seek control system. A loop gain adjustment algorithm is introduced to accurately estimate the velocity disturbance in spite of the uncertainties of fine actuator. A weighting function is optimally selected from a minimum fine seek open-loop gain, calculated by estimating the velocity disturbance. A robust fine seek controller is designed by considering a robust $H_{\infty}$ control problem using the weighting function. The proposed controller design method is applied to the fine seek control system of a DVD rewritable drive and is evaluated through the experimental results.