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为提高磁致伸缩导波换能器的激励效能,本文研究了磁场结构参数对偏置磁场空间分布的影响。基于COMSOL有限元仿真平台,对磁致伸缩换能器磁场分布特性进行了数值计算,研究了磁路结构形式、磁路和永磁铁数量等对偏置磁场分布的影响,最后优化出适合纵向导波激励的磁场结构参数。检测实验结果表明,随着偏置磁场磁路数量的增加,偏置磁场强度增大,磁场径向均匀性更好,磁致伸缩换能器的效能也相应提高;在相同磁路数量的条件下,永磁体数量的改变对换能器效能影响较小,四磁路偏置磁场最优;轭铁中部增加永磁铁后的磁路结构的偏置磁场的轴向均匀性更高,其激励效能更好。
In order to improve the excitation performance of the magnetostrictive guided wave transducer, the effect of the magnetic field structure parameters on the spatial distribution of the bias magnetic field is studied. Based on the COMSOL finite element simulation platform, the magnetic field distribution of the magnetostrictive transducer is numerically calculated. The influence of the magnetic circuit structure, the number of magnetic circuits and permanent magnets on the bias magnetic field distribution is studied. Finally, Wave excitation magnetic field structure parameters. The experimental results show that with the increase of the number of magnetic circuits in the bias magnetic field, the strength of the bias magnetic field increases and the radial uniformity of the magnetic field is better, and the performance of the magnetostrictive transducer increases accordingly. The change of the number of permanent magnets has little effect on the transducer performance, and the bias magnetic field of the four magnetic circuit is the best. The magnetic field structure of the magnetic circuit structure after the addition of the permanent magnet in the middle of the yoke has a higher axial uniformity, Better performance.