【摘要】：為了解決流固耦合模態(tài)使水聽器工作頻帶變窄的問題,理論分析了流體對雙膜片結(jié)構(gòu)的分布反饋式光纖激光水聽器固有頻率的影響,基于有限元軟件對水聽器加固封裝前后在空氣中和流體中的模態(tài)和頻響性能進(jìn)行仿真分析,加工制作了水聽器原型樣品并開展了水聲實驗研究.實驗結(jié)果表明,在2 500~8 000Hz的頻率范圍內(nèi),未經(jīng)加固封裝的水聽器由于在該頻段內(nèi)存在多個流固耦合固有頻率造成響應(yīng)曲線起伏較大,而采取了加固措施封裝后的水聽器獲得了-142.77±0.8dB的平均聲壓靈敏度,驗證了流體對水聽器頻響性能的影響以及改善措施的有效性,實驗結(jié)果與理論及仿真結(jié)果吻合較好.
[Abstract]:In order to solve the problem that the working frequency band of hydrophone is narrowed by fluid-solid coupling mode, the influence of fluid on the natural frequency of distributed feedback fiber laser hydrophone with double diaphragm structure is analyzed theoretically. Based on the finite element software, the modal and frequency response performance of hydrophone in air and fluid before and after hydrophone reinforcement and packaging are simulated and analyzed. The prototype sample of hydrophone is fabricated and the underwater acoustic experiment is carried out. The experimental results show that in the frequency range of 2500 鈮，

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