Theoretical Dynamic Model of the Piezoelectric （动态模型的压电理论）.pdf

Theoretical Dynamic Model of the Piezoelectric Actuator with Multi-DOF Loading Structure in Process of Microforging 1 2 3 4 Peng Hu , Tegoeh Tjahjowidodo , Sylvie Castagne , Muhammad Taureza School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore , 639798 1 Email: HUPE0001@e.ntu.edu.sg 2 Email: TTEGOEH@ntu.edu.sg 3 Email: SCASTAGNE@ntu.edu.sg 4 Email: M090051@e.ntu.edu.sg Abstract A piezoelectric actuator is applied in a microforging system which was designed specially by maximizing its structural rigidity to study size effects in microforming. To generate accurate movement in micrometer/nanometer scale, a dynamical model of the piezoelectric actuator is in need. A new approach which considers the effect of multi -degree- of-freedom (multi-DOF) loading structures on the dynamics of the actuators is proposed in this paper. Merging the constitutive equations of the piezoelectric materials to the dynamics of single -DOF and two-DOF external structures, theoretical models of the actuator are presented. By utilizing dynamic stiffness, the dynamical models are applicable to the piezoelectric actuators with multi -DOF loading structures. A general dynamic model of the piezoelectric actuator with multi-DOF loading structure will predict the behavior of the actuator. The linear mo