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基于HHT在分辨率和客观性方面的优势,提出一种新的输电塔结构损伤识别方法,在sap2000中建立模型,采用白噪声为激励信号,在主材上布置若干监测点进行信号的接收,应用经验模态分解法(EMD)分解输电塔在相同位置下发生损伤前后的响应信号,得到响应信号的各阶本征模态函数,再采用波形因数量化结构响应信号的各阶固有模态函数。通过对比结构损伤前后响应信号本征模态函数的波形因数,即可直观地判断结构有无损伤。
Based on the advantages of HHT in terms of resolution and objectivity, this paper proposes a new damage identification method for transmission tower structure. In sap2000, a model is established. White noise is used as excitation signal, and several monitoring points are arranged on the main material to receive signals. Empirical mode decomposition (EMD) is used to decompose the response signals of transmission towers before and after the damage at the same position to obtain the various eigenmode functions of the response signals, then the waveform factors are used to quantify the response of each order intrinsic mode function. By comparing the waveform factor of the eigenmode function of the response signal before and after the damage, the damage of the structure can be judged visually.