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Low-frequency compensation of piezoelectric micro-vibrations test platform

Original scientific paper PMTP (piezoelectric micro-vibrations test platform) is widely used to test the micro-vibrations emitted by the rotary equipment on a spacecraft. Due to the poor performance of the piezoelectric sensor in low frequency band, the test reliability of PMTP is low. A low-frequency compensation method is proposed to solve this problem. Firstly, the low-frequency compensation method of a single-axis piezoelectric force sensor is introduced and verified by experimental test. Secondly, the low-frequency compensation method of PMTP, which consists of eight single-axis piezoelectric force sensors, is proposed. Lastly, the low-frequency compensation method of PMTP is verified by experimental test. The results show that this method can effectively compensate the performance of PMTP in low frequency band.