Test study on active control of two-stage vibration isolation system based on reference signal reconstruction

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (17) : 153-159.

ZHANG Rui1, HAN Zhiyuan2, WANG Chaozheng2, ZHANG Lei1, SHEN Xing1

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Abstract

Aiming at the problem of reference signal instability in the vibration control process of two-stage vibration isolation system, a feedback theory-based reference signal reconstruction FXNLMS algorithm is designed to conduct vibration active control experiments under various working conditions. A two-stage vibration isolation active control experimental platform is built, and the FIR filter data channel model of the error channel is established using the least mean square algorithm; the classical FXLMS control algorithm is analyzed, and the reference signal is reconstructed by obtaining the output and error signals, and the step factor is adjusted in real time using the normalization method. Simulation analysis is carried out in single-frequency and multi-frequency cases, and the results show that the reconstructed signal has a high overlap with the actual signal and the control system has a good control effect. The experimental results show that the reference signal reconstruction algorithm has better stability and anti-interference capability than the FXLMS algorithm, and the vibration attenuation at the excitation frequency under different conditions can reach 15~30 dB.

Key words

active control / two-stage vibration isolation system / reference signal reconstruction / FXLMS algorithm / secondary channel modeling

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ZHANG Rui1, HAN Zhiyuan2, WANG Chaozheng2, ZHANG Lei1, SHEN Xing1. Test study on active control of two-stage vibration isolation system based on reference signal reconstruction[J]. Journal of Vibration and Shock, 2023, 42(17): 153-159

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