DVD循軌重復(fù)控制器的設(shè)計及參數(shù)優(yōu)化

在DVD 循軌伺服控制系統(tǒng)中，碟片的偏心會對循軌誤差信號TE(tracking errors)產(chǎn)生周期性的擾動。隨著光盤轉(zhuǎn)速的大大提高，該周期擾動會降低激光光頭循軌的性能。為了有效的抑制該干擾，DVD 循軌伺服控制系統(tǒng)引入了重復(fù)控制器。本文在穩(wěn)定性條件的基礎(chǔ)
上設(shè)計重復(fù)控制器并提出參數(shù)優(yōu)化的辦法，通過仿真驗證重復(fù)控制器能顯著有效地抑制頻率已知周期干擾信號。
關(guān) 鍵 詞：DVD,循軌伺服,重復(fù)控制,周期擾動
Abstract: In the track-following servo system of an optical disk drive, the eccentricity of optical dis will cause periodic disturbances on TE(tracking errors) signals. With the increase of rotating speed, however, the effect of periodic disturbances consequently degrades the performance of track-following. 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.
Key words: DVD; track-following servo; repetitive control; periodic disturbances