基于时频信号项的输电塔损伤识别柔度矩阵法

摘要

In order to locate damage position and quantify damage degree of transmission tower,the damage coefficient equa-tion established on the linear relation of flexibility matrix and structure geometric parameters,is solved with the utilization of WVD time-frequency distribution auto-term amplitude vector of vibration response under suddenly-unloading,by combining flexibility ma-trix method of cantilever structure damage identification and time-frequency analysis method of domain vibration signal. The numeri-cal example demonstrates its accuracy for damage identification and excellent noisy immunity.%将悬臂结构损伤识别柔度矩阵法和振动时域响应信号时频分析方法相结合，利用柔度矩阵与结构参数间的线性关系，引入突卸荷载激励下振动响应的WVD时频分布信号项幅值向量，通过求解损伤系数方程来识别集中质量型输电塔结构的损伤位置和程度。算例分析表明，所提出的方法通过一次测量就能准确地识别出结构单个或多个损伤的程度，并具有良好的抗噪性。