基于HaIbach阵列的电磁超声横波换能器优化设计

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中图分类号：TB9 文献标志码：A 文章编号：1674-5124（2025）07-0111-09

Abstract：To address the lowconversion efficiency of the conventional electromagnetic transducer for transverse waves， a new design of electromagnetic transducer based on the Halbach aray is proposed， which utilizes a double-layer Halbach array permanent magnet structure. Through comparative analysis of multiple magnet structures using finite element simulation and experiments，the results show that the maximum vertical magnetic flux density of a single-layer Halbach array magnet is 2.32 times and1.54 times that of a single magnet and a traditionally aranged magnet，respectively. Inaddition，the double-layer Halbach array magnet with different sizes in the upper and lower layers can still achieve an 10% increase in the maximum vertical magnetic flux density while reducing the volume by 37% . Furthermore， an orthogonal experiment is employed to study the parameters of the transducer. The simulation results indicate that the coil diameter， spacing between coils in the same layer，and spacing between double-layer coils have a significant impact on the echo amplitude， while the thickness of the backing plate and the distance between the backing plate and the coil have a negligible effect.The experimental results validate the accuracyof the orthogonal experiment.The research results show that the amplitude of the shear wave excited by the optimized transducer with double-layer Halbach array magnets is 122% 55% and 10% higher than that of traditional single magnets， traditional array magnets and single-layer Halbach magnets，and the signal-to-noise Ratio increased by 7.7dB ，4.6 dB，1.2 dB respectively， both experiments and simulations have a good verification effect.

Keywords： electromagnetic acoustic shear wave transducer; double-layer Halbach array； orthogonal experiment; optimal design; energy transfer efficiency

0 引言

电磁超声检测是一种新兴的无损检测技术，具有非接触、对工件表面状态适应性好、波形转换灵活等优点，在无损检测（NDT和内部结构评估（ISE）中有着重要的应用价值[1-3]。（剩余10554字）