量测噪声对输入未知条件下结构频率及振型识别的影响

Effects of Measurement Noise on Natural Frequencies and Mode Shapes Identified under Unknown Excitation Conditions

利用输入未知条件下结构模态参数识别的方法 ,通过仿真算例分析了测试噪声对识别的影响 ,最后利用同济大学图书馆地脉动加速度反应实测数据 ,对其模态参数进行了识别 ,得出了一些结论。

According to the method of identification of structure modal parameters under unknown excitation conditions,an analysis of the effects of measurement noise on the identified parameters is made by means of the simulating calculations on a structural model and the identification of a real building structure.Some useful condusions for the modal testing of building structures are derived.[KH4/5]