Shock Performance of a Disk-Drive Assembly Using Active-Passive Piezoelectric Actuators

Current dual-stage actuator design uses piezoelectric patches only without passive damping. In this paper, we propose a dual-stage servo system using enhanced active-passive hybrid piezoelectric actuators. The proposed configuration will improve the existing dual-stage actuators for higher precision and shock resistance, due to the incorporation of passive damping in the design. Finite element analyses of different types of piezoelectric actuators in a disk arm assembly under shock impulse are reported. In the shock test, a 175 g and 1 ms sinusoid acceleration pulse is applied at one end of the base and other end of the base is fixed. The shock responses of the disk arm assembly with different configurations of the piezoelectric actuators are simulated and compared. In the finite element analysis, the viscoelastic damping layers in the hybrid actuators are modeled with the Prony series, which parameters are determined from dynamic frequency data of nomograph