Janus-Helmholtz水声换能器理论问题研究

Theoretical research on Janus-Helmholtz underwater acoustic transducer

为了解决Janus-Helmholtz水声换能器研究中的理论问题,通过互辐射模型时的Janus-Helmholtz水声换能器等效电路,分析了Janus换能器纵振动谐振频率在水中升高的原因;通过对Janus换能器纵振动和液腔振动的相频曲线的分析,得出了Janus-Helmholtz水声换能器宽带发射的机理,研究了腔体弹性对Helmholtz声学性能的影响规律。设计了工作频段为1~3 k Hz的Janus-Helmholtz换能器试验样机,样机的测试结果表明其振动及声学特性与理论研究结果相符。

In this paper,the reason for increase of the longitudinal resonant frequency of a Janus transducer in water are analyzed through the equivalent circuit of Janus-Helmholtz underwater acoustic transducer by taking into account mutual radiation in order to solve the theoretical questions on Janus-Helmholtz acoustic transducer. The mechanism of broadband transmitting of Janus-Helmholtz underwater acoustic transducers is obtained by analyzing phase frequency curves of the vertical vibration and liquid cavity vibrations. The influence of cavity wall＇s elasticity on acoustic performance of Helmholtz resonator is researched. A prototype that operates in the band between 1 k Hz and 3k Hz is designed. Test results showed that the vibration and acoustic characteristics of the prototype are consistent with the theoretical research results.