时频分析在环境激励下模态参数辨识中的应用

Application of Time-Frequency Analysis for Modal Parameter Identification under Ambient Excitation

大型结构的模态测试、状态监测和运行状态下的结构模态参数辨识都使得传统的模态测试方法难以适用.相比而言,仅从输出响应辨识环境激励下的结构模态参数具有更大的灵活性.应用时频分析对响应信号作分解、重构操作能将复杂信号中的局部特征提取出来,进而进行模态参数的识别.

For modal testing or status monitoring of large or operational structures,traditional techniques often seem ineffective.In contrast,the identification from output response for modal parameter under ambient excitation presented more flexibility.By using time-frequency analysis to decompose and reconstruct response signals,properties of complex signals can be extracted for modal parameters identification.