Actuator control to suppress disturbances for 8 cm DVD-RAM video camera recorder

Imagawa, Seiji; Suzuki, M.; Ono, H.; Ohya, Jun

doi:10.1109/30.964142

Cited by 7 publications

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Adaptive hybrid tracking-error control for DVD drives in vehicular systems

Pan

Chien

2009

Microsyst Technol

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The paper presents the implementation and application of an adaptive hybrid controller for the servo system of a DVD drive in recreation vehicle, to suppress tracking disturbance with frequencies less than 100 Hz caused by environmental vibration and to improve the performance of tracking servo system. The adaptive hybrid servo control (AHSC) technique consists of both the active feedforward and feedback disturbance cancellation. In this paper, the controller is designed based on an adaptive digital filter with robust variable step-size filtered-x-least-meansquare (RVSS-FXLMS) algorithm. The applied RVSS-FXLMS filtering algorithm is a combination of the RVSS convergence and FXLMS algorithms. The control signal generated by the AHSC as an anti-error input can effectively suppress the tracking errors arising from vibration disturbance. The experimental results demonstrate that the AHSC can successfully improve the tracking performance on an existing architecture of the DVD drives in a vehicular system. More precisely, in severe disturbances the implemented hybrid system can still pick up data in high speed revolution, but not to decrease disk speed.

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Adaptive hybrid tracking-error control for DVD drives in vehicular systems

Pan

Chien

2009

Microsyst Technol

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Adaptive control for focusing of optical drive read/write heads

Tsao

Gibson

Chiu

et al. 2011

Proceedings of the 2011 American Control Conference

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This paper presents an adaptive control scheme and experimental results for the focusing of an optical readwrite head for optical data storage drives. The adaptive control applies recursive least squares (RLS) algorithm to predict output disturbance and dynamically computes control commands to minimize the output focusing error. The adaptive control could become unstable when significant modeling errors and uncertainties exist. An extension is made to the existent adaptive control scheme to achieve robust stability while sacrificing minimally the control performance. Simulation and experiment conducted on the optical focusing of a digital video recording drive's read-write head are presented to demonstrate the effects of the proposed adaptive control scheme on stability and performance.Index Terms -optical disk drive, adaptive control, autofocusing.

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