基于离散小波变换的桥梁结构损伤识别方法

Bridge Structure Damage Identification Methods Based on Discrete Wavelet Transform

基于小波子带信号的能量曲率变化损伤识别方法,运用ANSYS软件对一简支梁桥在冲击激力下振动响应信号进行数值分析,采用离散小波变换,根据响应信号相对能量的曲率差损伤指标,对具有两处损伤的结构进行损伤位置识别定位.结果表明,在一定条件下,该识别方法识别损伤简单有效,但损伤位置间距对识别效果有一定影响.

Through the approach of damage identification of the change of energy curvature in wavelet subband signal, this paper conducts a data analysis on the vibration response signal of a simply supported beam bridge under impact excitation force by using the ANSYS software. According to the curvature difference damage index of the relative energy of response signal, this research identifies the locations of two damaged structures by using discrete wavelet transform. The research result shows that the damage identification method is simple and effective; however, it is slightly affected by the distance between the damaged locations.