随机减量法在工作模态参数识别中的应用研究

Application and Research of Random Decrement Technique in Operating Modal Parameter Identification

实际工程应用中施加于结构的激励及其响应信号难以测量,不能用传统的识别方法提取结构的模态参数。研究了运用随机减量法从易得的结构的随机响应中提取某种自由响应信号,然后利用小波变换识别模态参数。实验通过对悬臂梁的模态参数识别,结果表明随机减量法在模态参数识别过程中的适用性及用该方法获取的模态参数具有很高的精度。

Based on the fact that the incentive applied to structure and response signal were cannot be measured in the actual project application. Therefore, the modal parameters of structure can＇ t be identified by the traditional identification method. Aiming at this problem, the method of random decrement technique to extract a free response signal from random response was studied. Then the modal parameters were identified by the method of wavelet transform. Through the modal of camilever beam was identified, the experiment shows that the applicability of random decrement technique in the prucess of modal parameters identification. And the structural modal parameters were obtained by use this method with high accuracy.