Feedback control of disk vibration/flutter by distributed self-sensing actuators

In this paper, a distributed self-sensing actuator (DSSA) is presented for active disk vibration/flutter suppression in hard disk drives (HDDs). The effectiveness of the disk vibration/flutter suppression by DSSA under different designed shapes has been investigated numerically. Both the sensing and actuating effects of the active piezoceramic layer were evaluated through experiments. Then, the out-of-plane vibrations of top disk were measured with and without the feedback control of DSSA. The magnitudes of disk vibration and flutter that are induced by the surrounding airflow, the ball bearing, and the resonances of the system, could be significantly suppressed to a large percent.