超声导波在管道中传播的可视化模拟研究

利用有限元方法建立管道导波3-D模型,通过在管道中激励纵向超声波,模拟导波在管道中的传播形态。根据回波信号的传播时间计算了纵波传播速度,与频散曲线得到的纵波速度符合较好。从观测点取得的波信号能够反映超声波在管道中传播时存在的反射和衰减现象,动画结果能够形象直观地反映导波在管道中传播的情形,实现了导波传播的可视化模拟。该研究有利于更好地解释导波在管道无损检测中出现的频散特征。

Simulated visualization of guided wave propagation in pipes

The three-dimensional finite element model of guided wave in the pipe was built by the finite element method.The mode simulated the propagation of guided wave in a pipe by applying the longitudinal ultrasonic to the pipe end.The velocity of the longitudinal ultrasonic was calculated according to the time of the reflected echo signals which agreed with the velocity calculated from the dispersion curve.The attenuation and refection of the guided wave propagation in the pipe were indicated from the echo signals obtained from the observation point.The simulated visualization of guided wave propagation in the pipe was realized and the process was indicated intuitionistic by the animation.This research makes it easy to explain the dispersion features of the guided wave in the use of nondestructive testing in pipes.