电磁超声表面波换能器设计参数仿真

The simulation of designing parameter of electromagnetic surface wave transducer

电磁超声换能器(EMAT)的建模仿真是对电磁超声产生和接收的物理过程的认知,通过仿真研究原理、优化设计参数可以有效提高电磁超声换能器的换能效率。为了获得电磁超声表面波换能器的最优参数,总结EMAT设计的基本准则,利用有限元分析软件ANSYS建立EMAT有限元模型,分别对3种不同类型激励线圈进行了仿真,进而分析了偏执磁场、线圈、提离距离与涡流之间的关系,寻找表面波换能器设计的关键参数,确定了各参数对换能效率的影响规律,指出各个参数在不同检测条件下要按实际需求选取才能达到最大的检测效率。

Modeling and Simulation from EMAT are a method to comprehend the physical process concerning electromagntic exciting and receiving. Researcher can increase EMAT＇s energy transduction efficiency by researching principle and optimizing parameter based on this method. In order to obtain the best designing parameter and rule according to electromagnetic surface wave transducer,EMAT＇s model is established by means of finite element methods and, simulate three kinds of exciting loop, and analysis the relation between paranoia magnetic field, loop, lift-off value, and Eddy current;several major parameters of the EMAT are found,and the law of every parameter impacting on the EMAT is obtained. It is pointed every parameter must be chose as according to the practical testing condition to improve detection efficiency.