Dynamic Investigation and Adaptive Tracking-Error Improvement of Optical Disk Drives

光碟機之動態研究及巡軌誤差改進

潘敏俊(Min-Chun Pan) ； 吳敏德(Min-Der Wu)

《中國機械工程學刊》 29卷4期 (2008/08) Pp. 333-339

https://doi.org/10.29979/JCSME.200808.0008

摘要

不經意地在光碟片上貼上註記標籤將造成嚴重運轉不平衡問題。本研究透過寬頻噪音激振方式探討旋轉光碟在變動轉速下之動態特性，藉著碟片位移訊號的譜圖(spectrogram)可觀測到碟片結構共振與轉速之調變現象，並能詮釋臨界轉速時之振動干擾。研究中實現尋軌誤差降低及尋軌效能提昇，實現架構於光碟機現有伺服控制器之適應性前饋雜訊消除之回授控制，用以抑制光碟運轉不平衡擾動，實驗結果顯示適應性前饋雜訊消除能夠有效抑制由於高速旋轉光碟之不平衡所造成的尋軌誤差。

並列摘要

The ignorant action to stick labels on optical disks for noting can make a severe imbalance problem. The study investigates the dynamic characteristics of a rotating optical disk at a varying speed through vibro-acoustic excitation. The disk imbalancing modulated with its resonant frequencies can be evidently observed by computed spectrograms. Then vibration disturbance at the critical speed is interpreted. Reductions on tracking errors and improvement on tracking performance are performed. An adaptive feedforward cancellation (AFC) scheme associated with the existing tracking servo through the feedback controller is implemented to cancel the disturbance effectively. Experimental results show the AFC apparently suppresses the tracking errors arising from the imbalancing of rotating disks.

並列關鍵字

imbalancing ； optical disc drive ； tracking-error improvement ； adaptive feedforward cancellation