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.
|Number of pages||7|
|Journal||Journal of the Chinese Society of Mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao|
|State||Published - Aug 2008|
- Adaptive feedforward cancellation
- Optical disc drive
- Tracking-error improvement