Simulation and Analysis of Dynamic Characteristics of Micro-Acceleration Switch with Finite Element Method

Four micro-acceleration switches, which have different support beams layout, were designed; four finite element analysis (FMA) models of these micro-acceleration switches were set up. By using the FEA models, the modal analysis and the harmonic response analysis of the micro-acceleration switches were performed. The first 6 order natural frequencies and mode shapes of the four micro-acceleration switcher were determined, the curves of the displacement response values versus frequencies for the micro-acceleration switch under a deterministic sine load were obtained. The results of study show that the fundamental frequency of micro-acceleration switch changes with the varying of the support beams layout, the fundamental frequency of micro-acceleration switch with 4 level layout beams and with 4 up and down beams layout is 527Hz and 564Hz respectively, and the 4 symmetrical beams layout and the 4 unsymmetrical beams layout used in the micro-acceleration switch result in the micro-acceleration switch has the fundamental frequency of 540Hz and 544Hz respectively. Under a 10N sine load, the key point of the 4 symmetrical beams layout micro-acceleration switch has the maximum displacement of 0.012mm, the 4 symmetrical beams layout used in the micro-acceleration switch is more reasonable than the three other beams layout