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

Abstract

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.

Introduction

“…More and more components employing different AVC technologies are being developed for the aviation, aeronautic, automotive and building industries. Some proposed applications of active vibration control include vibration control of large flexible space structures [39,59,72], fixed wing surfaces of commercial and military aircraft [19,27,28], blade surfaces and other parts of rotary wing aircraft [9,47,54], automobile suspensions [13,63,80], satellites [30], antenna systems [1,82], precision manufacturing techniques [21,92,98], robotic arms and manipulators [14,37,96], optical systems [53,65,68], earthquake protection systems [48,73,76] and many others. Vibration reduction efforts are illustrated on spacecraft featured in Fig.…”