电磁超声换能器仿真分析与优化设计

摘要

利用对称性简化永磁体的有限元建模，建立了用于激发Lamb波的电磁超声换能器的三维模型，同时考虑高频情况下的集肤效应造成的计算困难，得出了多根电流产生涡流场的解析解，并结合均匀性设计实验，得到了电磁超声换能器参数对涡流强度和电磁场强度的影响规律。%Using the symmetry to simplify the permanent magnet finite element modeling ,this paper proposes a three‐dimensional model of the electromagnetic acoustic transducer to generate Lamb wave . Meanwhile ,taking into account the difficulties in calculation caused by the skin effect at high frequen‐cy ,this paper deals with the distribution characteristics of the coil magnetic field by means of DC field and obtains the analytical solutions to the eddy current field produced by multiple current .The experi‐ments based on the uniform design result in obtaining the rule of the effect of the electromagnetic ul‐trasonic transducer parameters on the eddy current density and the electromagnetic field strength , w hich provides an optimum approach to designing an electromagnetic acoustic transducer .