摘要
ITD模态识别方法[1]可以不用系统的输入信息识别系统的模态参数,同时避免了数据变换(FFT变换[1])而引起的截断误差,但是识别的模态参数常常很不精确,且阻尼比的识别精度很差。采用调和最小二乘算法,并且在此基础上对阻尼比分两步进行识别。通过理论推导和算例验证得到:提出的算法能显著的提高阻尼的识别精度。
ITD method can identify structural modal parameters without structural input information and abstain from truncation deviation caused by FFT, but results of ITD identification are often inaccurate and damping rate of riD identification are very bad. On the basis of HLS, the paper proposes a new two-step ITD method to identify damping. Numerical example indicates that the proposed method can significantly improve the identified damping accuracy.
出处
《信息技术》
2008年第3期24-26,30,共4页
Information Technology
关键词
ITD模态识别
阻尼比
调和最小二乘
ITD modal identification
damping rate
harmonic least square
