利用频率响应函数矩阵识别阻尼矩阵方法研究

提出了一种改进的识别系统阻尼的方法,即直接从频率响应函数出发,识别结构的阻尼矩阵。利用该方法,可同时识别出结构的粘性阻尼和结构阻尼,每种阻尼由其对应的阻尼矩阵表示。对一两自由度的阻尼系统,利用本文的方法对阻尼进行了识别,并对均匀分布的噪声对阻尼识别精度的影响进行了数值模拟。最后将该方法应用到一实际的弹性地基梁中,成功地识别了阻尼矩阵。

Study on Using Frequency Response Function to Identify Damping Matrix

An improved method for system damping identification is proposed. it identifies the viscous damping and structural damping in matrix forms directly from its measured frequency response functions. The dampings of a two - degree system is identified by this method, and the effect of the uniformly distributed noise on the accuracy of the i-dentification result is studied using numerical examples. At last, the method is implemented experimentally to a realistic elastic foundation beam,and the damping matrix is identified successfully.