Feedback Control of Disk Vibration and Flutter by Distributed Self-Sensing Piezoceramic Actuators

This paper investigates the effect of suppressing the vibration/flutter of a spinning disk-spindle system using a distributed, self-sensing actuator (DSSA), which was made by piezoceramic patches and pasted on the cover of hard disk drives (HDDs). Both the sensing and the actuating effect of the active piezoceramic layer was conducted through experiments, after which the out-of-plane and in-plane vibrations of the top disk were measured with and without the feedback control of DSSA. The effectiveness of DSSA was illustrated on plate structure control, both in time domain and frequency domain. Then the same procedure was conducted on hard disk. The magnitudes of vibration and disk flutter that were induced by the surrounded airflow, ball bearing, and the resonant frequencies of the system could be significantly decreased to a large percent. The distributed DSSA can be pasted on either inside or outside the hard disk on the cover based on the requirements of convenience or commercial cost.