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为了提高储罐底板检测中电磁超声兰姆波换能器的换能效率,研究了兰姆波换能器的洛伦兹力机理和磁致伸缩力机理,理论研究结果表明:钢板中静态偏置磁场强度的平方与回波信号的强度成正比。对储罐罐底Q235钢板进行有限元仿真计算,通过改变电磁超声兰姆波换能器中永磁铁的结构,分析钢板内质点能量密度时间均值的分布情况,进而对兰姆波换能器开展试验研究,结果表明:改变电磁超声兰姆波换能器中永磁铁的结构后,兰姆波换能器的检测钢板距离增加了2.42倍。
In order to improve the energy conversion efficiency of electromagnetic Lamb wave transducer in tank floor inspection, the Lorentz force mechanism and magnetostrictive force mechanism of Lamb wave transducer are studied. The theoretical results show that the static bias The square of the magnetic field strength is proportional to the intensity of the echo signal. The finite element simulation calculation of tank bottom Q235 steel plate was carried out. By changing the structure of the permanent magnet in the electromagnetic Lamb wave transducer, the distribution of the time mean value of the energy density in the steel plate was analyzed, and then the Lamb wave transducer The experimental results show that the distance between the Lamb wave transducer and the steel plate increases by 2.42 times after changing the structure of the permanent magnet in the ultrasonic Lamb wave transducer.