DVD循轨伺服控制系统设计及参数优化

Repetitive controller design and optimization for track-following servo system of an opticaldisk drive

在DVD循轨伺服控制系统中,碟片的偏心会对循轨误差信号TE(Tracking Errors)产生周期性的扰动。为了有效抑制该干扰,DVD循轨伺服控制系统引入了重复控制器。在稳定性条件的基础上设计重复控制器并提出参数优化的办法,通过仿真验证重复控制器能显著有效地抑制频率已知周期干扰信号。

In the track-following servo system of an optical disk drive, the eccentricity of optical disk will cause periodic disturbances on TE （tracking errors） signals. In order to restrain the disturbances effectively, repetitive algorithm is applied to DVD track-following servo system according the characteristic of disturbance. Based on the stability of repetitive controller, this paper promotes a mapped method to determine and optimize the parameter of repetitive controller. And through an experiment, it is verified that the designed repetitive controller has a remarkable performance to attenuate the periodic disturbance while preserving the overall stability.