残余能量差法用于在役结构无损检测的研究

在役结构因其原始指纹不易获得,使得对其进行损伤检测存在一定的困难。基于动力检测方法的原理,提出了一种新的损伤识别指标———残余能量差,并且推导了各节点对于残余能量差贡献的表达式。根据结构损伤前后的残余能量差的变化可以判断损伤的发生与否及其损伤位置,它不需要结构的完好指纹作为比较,适用于在役结构的无损检测和状态监测。数值模拟和试验测试的结果都证明了该方法的有效性。

Application of Differential Residual Energy Method in Nondestructive Test of In-service Structure

For in-service structure it is difficult to con duct destructive test since its original finger print is hard to obtain. Based o n the theory of dynamic diagnosis, a new fault diagnosis index, differential res idual energy (DRE) is presented; and formula on contribution of each node to DRE is derived. According to the contribution of each node to DRE, the structure da mage could be located without the comparison with the perfect finger print of th e structure. This method is appropriate to non-destructive diagnosis and state monitoring of the in-service structure. The results from digital simulation and experimental tests approve the validity of the method.