超声导波传播方向控制有限元仿真与试验研究

FEM simulation and research on propagation direction control of ultrasonic guided waves

文章使用有限元(FEM)仿真不同设置条件下导波在管道中的传播特征,仿真结果与理论推导的结论一致,即导波实现单向传播必须同时满足3个条件:双通道传感器激励且幅值相等、两传感器间距为激励频率下导波波长1/4的奇数倍、双通道相位差为π/2的奇数倍。利用双通道磁致伸缩激励传感器在管道上激励导波进行方向控制试验,试验结果验证了理论分析及有限仿真结果的正确性。

This paper uses the finite element method(FEM)to simulate the propagation characteristics of guided waves in pipelines under different settings.The simulation results are consistent with the theoretically derived results.In other words,three conditions must be satisfied to realize the one-way propagation of guided waves.Specifi⁃cally,two-channel sensors are excited and have the same amplitude,the spacing between the two sensors is an odd multiple of 1/4 of the guided wavelength at the excitation frequency,and the two-channel phase difference is an odd multiple ofπ/2.A two-channel magnetostrictive excitation sensor is used to stimulate guided waves on a pipeline for direction control tests,and the experimental results validate the theoretical analysis and the finite simulation results.