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부찬혁,강창익,김호찬 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.2
The control objective in hard disk drives is to move head as fast as possible to target track and position the head over the center of target track in the presence of external disturbances. The external shock or disk clamping error in manufacturing process causes the disk center to deviate from the disk rotation center. The disk shift acts on control system as disturbance and degrades severely the performance of disk drives. In this paper. we present a new controller that compensates for the periodic disturbance very fast. 'The disturbance compensator is arranged in parallel with the state feedback controller. To avoid the interference with the state feedback controller. the compensator creates compensation signal without feedhack of system output until steady state. Finally, in order to demonstrate the superior performance of the proposed compensator. we present some simulation results using a matlab.
부찬혁,김호찬 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.2
In disk drive servo system, a notch filter is usually used to suppress the mechanical resonance of the actuator. However, the resonance frequency differs from drive to drive because of manufacturing tolerance and varies with temperature even within a single drive. In this paper, we present an adaptive digital notch filter that identifies the resonance frequency of an actuator precisely and adjusts automatically its center frequency. For this, we present a new estimator that estimates the resonance frequency based on the generated output signal when the control system is excited by the excitation signal composed of all the expected resonance frequency compments. Furthemiore. in order to demestrate the practical use of our work, we present some experimental results using commercially available disk drive.