高压管汇磁致伸缩导波缺陷检测模拟研究

针对高压管汇导波缺陷检测问题，基于磁致伸缩效应，借助COMSOL有限元仿真软件，建立高压管汇直管段的导波缺陷检测模型，探究导波的激励条件及缺陷检测效果，分析不同参数对缺陷附近磁感应强度分布的影响。研究结果表明:在频率为10 kHz的正弦电流信号激励下，可产生沿管道轴向传播的T（0，1）模态导波，并能辨别缺陷处的回波信号。改变缺陷的尺寸参数时，缺陷附近的磁感应强度随着缺陷深度增加呈增大趋势，随轴向宽度增加呈减小趋势，不同形状的缺陷对应的磁感应强度存在一定的差异；改变激励条件，磁感应强度均随激励电流、激励频率的增加呈不断增加趋势。

Simulation study on detection of magnetostrictive guided wave defects in high-pressure manifold

For the guided wave defect detection of high-pressure pipe,Based on the magnetostrictive effect,the guided wave defect detection model for the straight pipe section of high-pressure manifold was established by using the comsol software.The excitation conditions and the defect detection effect of the guided wave were explored,and the influence of different parameters on the magnetic induction intensity distribution near the defect was analyzed.The results showed that under the excitation of the sinusoidal current signal with the frequency of 10 kHz,the T(0,1) modal guided wave was generated,which propagated along the axial direction of pipeline,and the echo signal at the defect could be identified.When changing the size parameters of the defect,the magnetic induction intensity near the defect increased with the increase of defect depth,while it decreased with the broaden of axial width.The magnetic induction intensities corresponding to the defects with different shapes were different.When changing the excitation conditions,the magnetic induction intensity increased continually with the increase of excitation current and excitation frequency.