论文部分内容阅读
提出一种利用多模态耦合的低频、宽带、大功率的新型弯张换能器,其结构上将两椭圆的Ⅳ型弯张壳体沿长轴方向串联为一体,两组长压电陶瓷堆贯穿其中驱动。利用有限元软件设计并制作一款此新型换能器的样机,其工作频带通过耦合壳体前三阶弯曲模态及压电陶瓷堆纵振模态与壳体膜模态的复合模态展宽。经测试在1.4~6.0 kHz范围内,样机的发射电压响应大于128.5dB,声源级大于190dB。结果表明,此弯张换能器与只利用一阶弯曲模态的Ⅳ型弯张换能器相比不仅有更宽的工作带宽,还满足低频和大功率的声辐射要求。
A new type of bending transducer with low frequency, wide band and high power using multi-modal coupling is proposed. The structure of the two elliptical type IV bending cascades is connected in series along the long axis. Two sets of long piezoelectric ceramics The heap runs through it. The finite element software is used to design and fabricate a prototype of this new type of transducer. The working frequency band of the new transducer is determined by the first three modes of the coupling shell and the composite modal broadening of the piezoelectric mode and the film mode . Tested in the 1.4 ~ 6.0 kHz range, the prototype launch voltage response greater than 128.5dB, sound source level greater than 190dB. The results show that this bending transducer not only has a wider working bandwidth than the type IV bending transducer which utilizes only the first-order bending mode, but also meets the low-frequency and high-power acoustic radiation requirements.