水介质弹性共振腔的中低频吸声特性研究（英文）

Performance of Acoustic Absorption of the Elastic Resonator Filled with Water in the Low and Medium Frequency

文章以降低声呐罩自噪声为背景,将声呐罩简化为矩形声腔,建立了弹性共振腔阵列及声学覆盖层与矩形声腔的声振耦合模型;计算分析了弹性共振腔构型参数对声腔中低频声场控制效果的影响,进而提出能够有效扩展中低频吸声效果的格栅式弹性共振腔;通过试验验证了弹性共振腔的吸声效果,并计算分析了弹性共振腔阵列和声学覆盖层组合作用的宽频带吸声效果;在100~2 000 Hz的中低频段内矩形声腔取得了3~10 dB的吸声效果。

In order to study the self-noise reduction problem of sonar domes,the sonar dome is simplified as a rectangular acoustic cavity.An acoustic cavity-elastic plate coupling model is established,the interaction between the inner sound filed of the cavity and the elastic resonator array or the acoustic coating is described by using the impedance matching method.The influence of geometry configuration of the elastic resonator to the noise reduction effect of an acoustic cavity in the low-frequency domain is calculated and analyzed.A grid-type elastic resonator array capable of effectively expanding the mid-low frequency sound absorption is proposed.The broadband sound absorption effect of the elastic resonator array and the acoustic coating simultaneously arranged on the bottom of the rectangular acoustic cavity is studied and the experimental validation for the sound absorption performance of the elastic resonator array is conducted.In the low and medium frequency band of 100-2 000 Hz,the rectangular sound cavity achieves a sound absorption effect of 3-10 dB.