基于独立分量分析的结构模态参数识别

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振动与冲击 ›› 2010, Vol. 29 ›› Issue (3) : 137-141.

论文

基于独立分量分析的结构模态参数识别

静行1;袁海庆1;赵毅2

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STRUCTURAL MODAL PARAMETER IDENTIFICATION BASED ON INDEPENDENT COMPONENT ANALYSIS

JING Hang1; YUAN Hai-qing1; ZHAO Yi2

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摘要

简要介绍了独立分量分析的基本原理及算法，探讨了结构的正规坐标与独立分量的关系。分析认为，结构自由振动响应的振型分解可以看做是一个ICA问题。因此，可以把独立分量分析发展成为一种利用结构自由振动响应时域信号进行模态参数识别的方法。结合数值仿真算例及振动试验，验证了独立分量分析用于结构模态参数识别的有效性。结果表明，独立分量分析可以准确的从结构自振响应中，分离出各正规坐标，同时估计出各阶模态振型向量，适用于环境激励下的工作模态参数识别。

Abstract

The basic theory and algorithm of independent component analysis are briefly introduced, and then the relation between normal coordinates and independent components is discussed. Normal coordinates are considered as a specific case of sources that have certain time structure. So, the mode-superposition of structure can be identified by blind source separation algorithms and independent component analysis is developed to identify structural modal parameters by using free vibration response signal directly. Numerical simulation and experimental results indicate that independent component analysis is robust to mode shape extraction and suitable for output-only structural modal parameter identification.

导出引用

静行;袁海庆;赵毅. 基于独立分量分析的结构模态参数识别[J]. 振动与冲击, 2010, 29(3): 137-141

JING Hang;YUAN Hai-qing;ZHAO Yi. STRUCTURAL MODAL PARAMETER IDENTIFICATION BASED ON INDEPENDENT COMPONENT ANALYSIS[J]. Journal of Vibration and Shock, 2010, 29(3): 137-141

中图分类号： TU311.3