重複性控制應用於光碟機上循軌偏差量的消減

Abstract

本論文探討在光碟機高倍讀取時如何消除循軌誤差量, 在不改變原有設 計的架構下使用重複性控制的理論來達到此一目的. 本文主要包括兩部 份:一是系統數學模型的推導,此部份從系統規格的說明到電路分析最後藉 著Matlab以及動態分析儀的輔助來得到實機的數學模型。接著以Matlab模 擬的結果以及理論﹐以TI DSK50為平台對實機以內崁入的方式將重複性控 制器建立進入實際的光碟機控制 迴路中.文中實驗的結果顯示利用所 發展的方法確實可以將循軌誤差作大幅的消減,達到更佳的循軌效果.並且 討論與實際控制器結合的可行性。 In this thesis, a method for reducing the run-out influence due to the tracking servo control system is investigated. Because the run-out signal is priodic, we use the repetitive control algorithm forreducing it without changing the original controller structure . This thesis contains two major parts . The first part deals with the system standard, the circuit analysis and mathematical modelling of the pick-uphead by the Matlab and DSA(Dynamic system Analyser). The second part,deals with the simulation and the practical implementation. We applied the repetitive control algorithm to the tracking control loop of the CD-ROM by TI DSK50 Kit. Experimental results clearly demonstrate that the developed method can reduce the tracking error successfully. Discussionabout the implementation in the real controller are also given.