用于检测厚铝板缺陷的体波EMAT优化方法

发布时间：2018-04-02 01:18

本文选题：电磁超声换能器　切入点：体波　出处：《电机与控制学报》2017年01期

【摘要】：针对电磁超声换能器(electromagnetic acoustic transducer,EMAT)的换能效率低,易受外界环境噪声影响导致回波信号较小、信噪比较低的问题,提出一种使用正交试验的优化方法进行改进。该方法基于电磁场涡流效应、质点弹性动力学的波动方程及有限元法,建立了一个检测厚铝板单平底孔缺陷、收发一体的体波EMAT二维有限元模型。该模型应用正交试验和极差分析法,通过对比不同结构下的缺陷回波电压信号强弱程度,分析磁铁和线圈的结构参数对其的影响,获得了优化的模型结构参数值。同时,得出在本结构下磁铁与线圈的最佳宽度比。通过实验验证了优化结果的有效性,缺陷回波电压峰-峰值的实验与仿真结果相符。
[Abstract]:Aiming at the low efficiency of electromagnetic acoustic transducer (EMT), which is easily affected by external noise, the echo signal is small and the signal-to-noise ratio (SNR) is low, an optimization method based on orthogonal test is proposed to improve it.Based on the eddy current effect of electromagnetic field, the wave equation of particle elastic dynamics and the finite element method, a two-dimensional EMAT finite element model for detecting the defects of single flat bottom hole in thick aluminum plate is established.By using orthogonal test and range analysis method, the influence of the structure parameters of magnets and coils on the strength of echo voltage signals of defects under different structures is analyzed, and the optimized structural parameters of the model are obtained.At the same time, the optimum width ratio of magnet to coil is obtained.The effectiveness of the optimized results is verified by experiments. The results of the peak to peak of the defect echo voltage are in agreement with the simulation results.
【作者单位】：哈尔滨理工大学测控与通信工程学院;哈尔滨工业大学电气工程及其自动化学院;
【基金】：国家自然科学基金(11304067)
【分类号】：TG115.285

【相似文献】