单自由度结构系统损伤诊断的EMD法

研究了有阻尼和无阻尼的单自由度结构体系的损伤诊断问题 ,损伤假定是因为在某一特定时间刚度的突然损失而产生的 .从理论上推导了单自由度结构系统发生损伤的响应公式 ,证明了经验模式分解 (EMD,empirical mode decomposition)法的有效性 .研究结果表明在很多情况下应用 EMD法探测结构损伤 ,可以检测损伤的发生时间和程度 ;在位移、速度和加速度响应信号中 ,加速度信号最敏感

Damage Diagnosis of SDOF Structure Systems Using Empirical Mode Decomposition Method

The present paper focuses on the damage diagnosis problem of a damped or un damped sigle degree of freedom (SDOF) structural system. The damage considered is owing to a sudden stiffness loss at a particular time. The response formulations of SDOF structure systems with damage are deduced and the effectiveness of the EMD method is tested. The study results indicate that applying the EMD method to detect structure damage, both its time and degree, is promising in many cases. Among the displacement, velocity and acceleration response signals, the acceleration is the most sensitive signal.