关键词: 模态分析, 模态参数, 独立分量分析, 盲源分离

Abstract: This paper presents a new output only time domain modal parameter identification method based on Independent Component Analysis（ICA）.Firstly，the method interprets the vibration system modals as virtual sources，and then uses ICA to process the system responses.Finally some single-frequency identification signals can be gotten，thus the multi-DOF system modal identification problem is turned into a single degree of freedom system parameter identification problem.A simply supported beam is tested by finite bandwidth Gaussian white noise excitation，the result shows that the method based on Independent Component Analysis can be used to identify the modal parameters effectively.

Key words: modal analysis, modal parameter, Independent Component Analysis（ICA）, Blind Source Separate（BSS）