多点激励功率谱再现振动试验控制研究

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (10) : 168-172.

论文

多点激励功率谱再现振动试验控制研究

王海东1，栾强利2，陈章位2，贺惠农3

作者信息 +

Control research on multi-exciter power spectral density replication of vibration test

WANG Hai-dong1，LUAN Qiang-li2，CHEN Zhang-wei2，HE Hui-nong3

Author information +

文章历史 +

摘要

通过对多点激励功率谱再现振动试验控制算法研究.设计基于偏相干分析理论的振动试验系统频响矩阵辨识策略，针对系统频响矩阵存在奇异点及系统频响矩阵为长方矩阵情形，设计基于求解频响矩阵广义逆和矩阵最小范数最小二乘解的Moore-Penrose逆系统解耦算法。针对传统差分修正驱动谱控制算法中存在系统功率谱自谱为负数或零值问题，通过引进比例均方根反馈修正算法，设计改进的功率谱均衡控制策略，有效避免功率谱均衡过程中自谱产生负值或零值问题。多点激励功率谱再现振动试验表明，改进的功率谱均衡控制策略对多点激励系统具有可靠、高精度的控制效果。

Abstract

Through the control algorithm research on multi-exciter PSD (power spectral density) replication of vibration test designed an identification strategy for the frequency response matrix of the vibration test system based on partial coherence analysis. For the situations of singular points existing in the system frequency response matrix and the matrix being rectangular, respectively designed different system decoupling algorithms upon the solution of the matrix generalized inverse and its Moore-Penrose inverse with minimum norm and least squares solution. And for the situation that the system APSD (auto-power spectral density) might be negative or zero in the traditional difference correction of the drive spectral control algorithm, designed an improved PSD equalization strategy by introducing a proportional RMS feedback correction algorithm. The algorithm could effectively avoid the APSD being negative and zero in the process of PSD equalization. Through the multi-exciter PSD replication test, it’s indicated that the improved PSD equalization strategy can achieve a reliable, high-precision control effect in the multi-exciter vibration system.

导出引用

王海东1，栾强利2，陈章位2，贺惠农3. 多点激励功率谱再现振动试验控制研究[J]. 振动与冲击, 2015, 34(10): 168-172

WANG Hai-dong1，LUAN Qiang-li2，CHEN Zhang-wei2，HE Hui-nong3. Control research on multi-exciter power spectral density replication of vibration test[J]. Journal of Vibration and Shock, 2015, 34(10): 168-172

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