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利用能量法得到了开缝压电圆环水中的谐振频率方程与电导纳曲线;通过构建开缝压电圆环低频接收状态等效电路图,推导了开缝压电圆环低频开路电压灵敏度;比较开缝压电圆环和整体圆环低频接收灵敏度,提出了利用开缝压电陶瓷圆环与溢流结构相结合设计深海水听器的思路;通过建立溢流式开缝压电圆环有限元仿真模型,探讨了开缝压电圆环的低频开路电压灵敏度与圆环结构参数的关系。经过仿真优化,研制了水中谐振频率600 Hz的开缝压电圆环深海水听器。水池声学测试与耐压测试结果表明,溢流式开缝压电圆环水听器在100~300 Hz频段内低频开路电压灵敏度最大值为-193.2 dB,最小值-197.9 dB,起伏-4.7 dB,耐静水压30 MPa;与采用相同尺寸压电元件的溢流圆环水听器相比,溢流式开缝压电圆环水听器的低频开路电压灵敏度提高20 dB;验证了本文提出的采用开缝压电圆环构建深海水听器的实用性。
The resonant frequency equation and admittance admittance curve were obtained by using the energy method. The equivalent circuit diagram of the low frequency receiving state of the piezo-electric ring with a slit was established, and the sensitivity of open-circuit piezoelectric ring low-frequency open-circuit voltage was deduced. The piezoelectric ring and the low-frequency receiving sensitivity of the whole ring were proposed. The idea of using deep-sea hydrophone combined with the open-loop piezoelectric ceramic ring and the overflow structure was proposed. By setting up a limited Element simulation model, the relationship between low-frequency open-circuit voltage sensitivity and ring structure parameters of a slotted piezoelectric ring was discussed. After simulation and optimization, a deep-sea hydrophone with a slit piezoelectric ring with a resonance frequency of 600 Hz in water was developed. The results of pool acoustics test and pressure test show that the maximum sensitivity of low frequency open circuit voltage in the frequency band of 100-300 Hz is -193.2 dB, the minimum value is -197.9 dB, the fluctuation is -4.7 dB , Hydrostatic pressure 30 MPa; Compared with the overflow ring hydrophone with the same size of piezoelectric element, the open-circuit piezoelectric ring hydrophone overflow open-loop voltage sensitivity increased by 20 dB; verify this article The practicality of constructing a deep sea hydrophone using a slit piezo ring is proposed.