将多尺度小波分析引入到在线结构损伤诊断上来,充分利用其在处理非稳态信号上的优势,从在线监测过程中得到的时程曲线中提取结构的损伤信息。通过编制刚度随时间变化的损伤模拟程序,得到损伤结构的时程反应,提出了相应的损伤指标-λk,从而做到对于结构损伤的确认以及时间和空间上的定位,最后通过数值算例验证了该方法在处理在线结构损伤诊断上的可行性。 The multi-scale wavelet analysis is introduced into the on-line structural damage diagnosis. Taking full advantage of its advantages in handling unsteady signals, structural damage information is extracted from the time history curves obtained from on-line monitoring. Through the preparation of the damage simulation program with stiffness variation over time, the time-history response of the damaged structure is obtained, and the corresponding damage index -λk is proposed, so as to confirm the structure damage and locate in time and space. Finally, numerical examples are used to verify This method is feasible to diagnose the damage of online structure.