基于传递率函数的结构损伤识别研究

摘要

The excitation information is usually needed as the structure damage identification methods based on the structural dynamic characteristic are used.However,the excitation information cannot be measured ac-curately.So,in this paper,the acceleration transmissibility functions of the two adjacent points were calcu-lated through the Fourier transform and a new damage index was constructed with the transmissibility func-tion.The damage location of the structure can be identified with this new damage index.This method re-quires neither the excitation information nor the modal analysis.The numerical simulation of an offshore plat-form structure and the shaking table test showed that the proposed method is feasible and has a certain robust feature.%基于动力特性的结构损伤识别方法通常需要已知激励信息，而激励信息一般难以准确测得。为此，直接对加速度响应进行傅里叶变换并计算相邻两点的传递率函数，利用传递率函数构造相应的损伤指标，通过该指标来识别结构的损伤位置，这种方法不需要已知激励信息，不需要进行模态分析。海洋平台结构的数值模拟和振动台试验表明，该方法是可行的，且具有一定的抗噪声能力。