复合棒型压电换能器的纵弯振动

Flexural and Longitudinal Vibration of a Compound Bar Piezoelectric Transducer

在研究多模耦合宽频带复合棒型换能器的过程中发现这种换能器在空气中的纵弯振动具有明显的规律性。采用有限元方法分析计算了前辐射头在两端自由和小端面中心固定时在空气中的弯曲振动模态,以及这些模态随其几何尺寸变化的关系;计算分析了换能器多模振动特性与前盖板几何尺寸之间的变化关系。为进一步实现换能器纵弯耦合、设计宽频带换能器提供了参考。

The title mentioned vibration is found regular in air in investigation of wideband compound bar transducer by coupling between longitudinal and flapping （or flexural） vibrating mode. By using commercial FE method. For a single head simulating and it, s boundary condition in a compound bar transducer, its vibrating mode and relationships between the mode and its geometry size is analyzed in-air. The longitudinal elementary frequency, and coupling between transducer longitudinal and flapping on elementary frequency with dimensions of head is calculated in-air. The conclusions are helpful to achieve a wideband compound bar transducer by mode coupling between the longitudinal piston mode and the flapping mode.