摘要
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。
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.
