Performance of Acoustic Absorption of the Elastic Resonator Filled with Water in the Low and Medium Frequency; [水介质弹性共振腔的中低频吸声特性研究]

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 lowfrequency 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. © 2019, Editorial Board of Journal of Ship Mechanics. All right reserved.