Transient Response Research of Micro Spring-mass System Impacted by Half-sinusoid Pulse

摘要

To study dynamic characteristics of a spring-mass system with a feature size of about 15um, the physical model and kinetic equation of the system were established. Based on the theorem of momentum, the conservation of mass and energy, and the vibration theory of single degree of freedom system, the displacement formula of the response of a spring mass system under a half-sine acceleration pulse is derived. The finite element analysis software Ansys12.1 Workbench is used to conduct modal and dynamic simulations. The relative errors of the deduced formula calculation results and the simulation results are less than 2%, which prove the correctness of the formula. Studies have shown that we can distinguish different acceleration excitations by finding a spring mass systems with different response displacements.