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中文摘要：
三叠片型偶极声波测井换能器可以用来测量快速地层和慢速地层的横波速度。基于有限元方法，对三叠片型偶极发射声波换能器进行结构仿真与设计。系统探讨了换能器尺寸和结构各参量的改动对换能器频率特性和辐射特性的影响。当压电陶瓷片的厚度增加、金属基片的厚度增加，或者压电陶瓷片的长度增加时，换能器的谐振频率升高；当金属基片的长度增加时，换能器的谐振频率降低。换能器的声辐射效率随压电陶瓷片或者金属基片长度的增加而增加，随它们厚度的增加而降低。
英文摘要：
Sandwich dipole transducers are used for measuring shear wave velocities in both hard and soft formations in acoustic well logging. Numeral simulations with finite element method are conducted for evaluating the efficiency of sandwich dipole transducer. Detailed is effect of modifying the transducer＇s physical sizes and other performance parameters on its frequency character and radiation property. Our analysis demonstrates that, the natural frequency will increase as the ceramic slices thickness, metal slice thickness or ceramic slice length increases, while the natural frequency will decrease as the length of metal slices increases. Numeral simulation also shows either the increase of the length or width of ceramic and metal slices, or the decrease of their thickness, will cause an increase of the transmitting efficiency of dipole transducer.
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