【摘要】 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。更多还原

【Abstract】 Based on the advantages of resolution and objectivity for HHT,a new approach is presented to detect damage of transmission tower structure.Models are established in sap2000 and white noise is adopted as excitation signal.A number of monitoring points are arranged on the primary steels to receive signal.And the empirical mode decomposition(EMD) is used to decompose response signal that has occurred in the same position on transmission tower before and after damage.Then the response signal of various intrinsic mode functions is obtained.Finally,the form factor is used to quantize analysis the response signal of the structure of intrinsic mode functions.Thus,it can judge the structure damage intuitively by contrasting inform factor of intrinsic mode function of response signal that the structure is damaged before and after.更多还原