摘要
针对骨架型电磁超声相控阵换能器设计方法不明确、换能效率低的问题,采用有限元建模仿真和实验相结合的技术路线,研究一种骨架型电磁超声相控阵换能器设计方法。建模分析了单通道电磁超声换能器(electromagneticacoustic transducer,EMAT)线圈绕制方式,随着角度增加,线圈采用水平绕制方式产生的声压显著大于垂直绕制方式;分析了在线圈间隔离绕制和重叠绕制2种方式下,电磁超声相控阵声场的变化规律,结果表明重叠绕制方式激发产生的横波幅值明显大于隔离绕制方式。在上述仿真分析的基础上,研制了导线长度为10mm、30匝的骨架型电磁超声相控阵换能器,成功实现了铝板中直径为3mm垂直孔的缺陷检测。
Aiming at the problem that the design method of the skeleton-type electromagnetic ultrasonic phased array transducer is not clear and the efficiency of energy transfer is low, a skeleton-type electromagnetic ultrasonic phased array transducer is studied and validated by combining the finite element method and the experimental method. The main results are as follows: modeling and analyzing the winding method of single channel EMAT coil, with the increase of angle, the sound pressure produced by horizontal winding method is significantly larger than that of vertical winding method; the sound field variation rule of electromagnetic ultrasonic phased array is analyzed in two ways, that is, the separation and overlap between coils, the result show that the amplitude of shear waves generated by the overlapping method is significantly greater than that of the separated winding method; on the basis of the above simulation analysis, the skeleton-type electromagnetic ultrasonic phased array transducer with the wire length of 10 mm and the turns of 30 is developed, and the defect detection of the vertical hole with a diameter of 3 mm in the aluminum plate is successfully realized.
引文
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