人体振动计校准夹具优化设计及仿真分析OA

According to the appearance characteristics of the cushion sensor,the structure of the calibration fixture for the human vibration meters was preliminarily designed.Based on the Dunkerley method and the differential equation of the transverse free vibration of the thin plate,the theoretical estimation formula of the fundamental frequency of the fixture was derived.By calculating the fundamental modal of the fixture with the finite element software,the rationality of theoretical model was verified.Based on the simulation results,the fitting function of fundamental frequency and thickness was obtained through the least squares method.The maximum linear error obtained is only 0.62%.Moreover,a mathematical optimization model was established to optimize the thickness parameters,which ensured that all the performance aspects of the fixture meet the requirements of the optimized design.Finally,by analyzing the characteristics of the vibration modals,a structural optimization scheme for the fixture was proposed,and the fundamental frequency was increased to more than twice that before.