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简要介绍了独立分量分析的基本原理,探讨了多自由度系统动力响应模态提取与独立分量分析之间的关系。分析认为,在自由振动和宽带随机激励下,多自由度系统动力响应的模态提取可以看作是一个满足独立分量分析条件的问题,运用独立分量分析可以直接从结构的自由响应信号或随机响应信号中提取出各阶模态坐标,同时估计出模态振型向量。三自由度仿真算例表明该方法进行模态提取是有效的,并具有较高的精度。
The basic principle of independent component analysis is briefly introduced, and the relationship between modal extraction of dynamic response and independent component analysis of multi-degree of freedom system is discussed. The analysis shows that under free vibration and broadband random excitation, the modal extraction of multi-degree-of-freedom system dynamic response can be regarded as a problem that satisfies the condition of independent component analysis. Independent component analysis can be used directly from the structure’s free response signal or random response Signal extracted from the modal coordinates of each mode, while estimating the modal vibration vector. Three-degree-of-freedom simulation shows that this method is effective for modal extraction and has higher accuracy.