A time-reversal defect-identifying method for guided wave inspection in pipes
A time-reversal defect-identifying method for guided wave inspection in pipes
复制标题
管道导波检测的时间反演缺陷识别方法
DOI：
10.1115/1.2892029
复制
发表时间：
2008-05-01
影响因子：
1
通讯作者：
He, Cunfu
中科院分区：
文献类型：
--
作者：
Deng, Fei;Wu, Bin;He, Cunfu
利用传递函数理论研究了时间反转法对管道导波检测的时空聚焦效应。沿管道传播的时间反转波的振幅不仅取决于缺陷的特性和观察位置，还取决于时间反转换能器的位置。特别是，在采用这种时间反转方法时，分布在管道周围的换能器的数量是很重要的。结果表明，时间反转方法可以提高导波检测的检测能量，并在周向上定位缺陷。将导波检测得到的时间反向信号应用到数值模型上，利用导波沿管道模型传播的时间反向波运动来识别缺陷。数值模拟和实验结果验证了该方法的有效性。
The temporal-spatial focusing effect of the time-reversal method on the guided wave inspection in pipes was investigated theoretically in the current research with a transfer function. The amplitude of the time-reversed wave propagating along the pipes was not only determined by the characteristics of the defect and the location for observation but also by the location of the time-reversal transducers. Especially, the quantity of transducers distributed around the pipe in the circumferential direction was found to be important in applying such time-reversal method. The results demonstrate that the time-reversal method can be used to enhance the inspection energy for the guided wave inspection in pipes and to locate the defects in the circumferential directions. Once the time-reversed signals obtained from the guided wave inspection are applied on a numerical model, the defects can be recognized by the motion of the time-reversed wave transmitting along the pipe model. Numerical simulation and experimental results are provided in this paper to illustrate the validity of such defect-identifying method.