Current feedback for shock disturbance attenuation in a compact disc player

Control of compact disc mechanisms is highly challenging not least due to the many conflicting control objectives arising from a large number of disturbances of rather different physical natures. A method is proposed which enables the control system to distinguish between some of the disturbance classes. A significant robustness problem is solved by a simple adaptive scheme which takes real-time constraints into consideration. The results show a significant attenuation of mechanical shocks for the compact disc mechanism