MULTIFIELD SIMULATION AND EXPERIMENT OF ELECTROMAGNETIC ACOUSTIC TRANSDUCERS

摘要：

　　An FEM model is proposed for the generation of Lamb wave using meander-line-coil electromagnetic acoustic transducers (EMATs).We aim to investigate the contribution of dynamic electromagnetic field to generate Lamb wave in EMATs operating on the Lorenz principle.The EMAT model was described by static magnetic field, dynamic electromagnetic field, eddy current, Lorenz force, and displacement.First, the bias magnetic field by permanent magnet was simulated to generate Lamb wave.Secondly, the influence of dynamic electromagnetic field on the excitation process of Lamb wave was discussed in detail.Thirdly, a Lamb wave dispersion curve in frequency-wavenumber domain was plot by using 2D Fourier transform.The simulation and experiment results show that the dynamic magnetic field does not contribute to the excitation of the Lamb wave, and the influence of the dynamic magnetic field can be ignored in the modeling of the EMATs.

关键词： Electromagnetic acoustic transducers (EMATs) Lamb wave Multifield 2D Fourier transform

作者: Ying-hong ZHANG Bin WANG Ting WANG Zheng-hua QIAN

作者单位: State Key Laboratory of Mechanics and Control of Mechanical Structures / College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

会议类型: 国际会议

会议名称: The 2017 Symposium on Piezoelectricity,Acoustic Waves and Device Applications(2017全国压电和声波理论及器件技术研讨会)

会议地点: 成都

会议语种:英文

页码: 206-210

在线出版日期: 2017-10-27（万方平台首次上网日期，不代表论文的发表时间）