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为了进一步提高VII型弯张换能器的工作性能,本文对VII型低频弯张稀土换能器课题研究作了总结:研究了弯张换能器各方向尺寸与其同相振动谐振频率之间的关系;计算了VII型弯张换能器壳体给驱动元件施加一定预应力时,壳体所需的装配位移的大小,并作了相应的实验验证;对研制出的换能器弯张壳体及换能器的振动模态进行了测试,与理论计算相符;测试了VII型弯张换能器的声学性能-水中呼吸模态对应谐振频率为1.16kHz,带宽为680Hz,机械品质因数Qm为1.71,单位电流发射响应在谐振频率处达到186.1dB,电声效率为13.1%;弯张换能器随入水深度的不同, 驱动元件两端所受到的总的预应力是不同的,计算了换能器入水深度与预应力的关系;利用赫姆霍茨积分方程—有限元结合方法,计算出了换能器辐射声场指向性。在本文最后,指出了今后改进该型换能器性能的方向。
In order to further improve the performance of type VII bending transducer, this paper summarizes the research of type VII low frequency bending rare earth transducer. The relationship between the dimensions of bending transducer and its in-phase vibration resonance frequency ; When the type VII bending transducer shell is applied to the driving element, a certain prestressing force is applied, the size of the assembly displacement required by the shell is calculated and the corresponding experimental verification is made. And the vibration mode of the transducer were tested, which was in line with the theoretical calculation. The acoustic performance of Type VII bending transducer was tested. The resonance frequency of water breathing mode was 1.16 kHz and the bandwidth was 680 Hz. The mechanical quality factor Qm was 1.71, the unit current emission response at the resonant frequency of 186.1dB, electro-acoustic efficiency of 13.1%; bending transducer with the depth of the different water, the driving element suffered both ends of the total prestress is different, calculated The relationship between depth of infiltrated water and prestress was calculated. The Hertz’s integral equation-finite element method was used to calculate the radiation field directivity of the transducer. At the end of this paper, we point out the direction to improve the performance of this transducer in the future.