压电惯性驱动器惯性冲击力的分析与检测

Abstract

The movement of a piezoelectric inertial actuator is come from the inertia impact,so this paper explores the inertia impact of a piezoelectric vibrator excited by a square wave.The impact response of the piezoelectric vibrator excited by the square wave was deducted.The time-domain and amplitude-frequency characteristics of the piezoelectric vibrator were analyzed and the theory and experiment results show that the frequency of the inertial impact signal mainly is concentrate on the0—500 Hz in square wave excitation.An acceleration sensor was used to test the acceleration parameters and the test results are closed to that of the model.The inertial impact force was calculated by the end inertial mass of the piezoelectric bimorph vibrator,and the amplitude-frequency characteristics of acceleration parameter were obtained by the fast Fourier transfer algorithm.Finally,the tribology method was used to verify the test results.Theory and experiment results show that the maximum relative error of two methods is 8.98%,which verifies that the tests of inertial impacts by acceleration sensors are feasible.