一种新型的水下低频共鸣器  

A novel underwater low-frequency resonator

作　　者：邱燕萍 周浩萌 寻天雨 郁高坤[1] QIU Yanping;ZHOU Haomeng;XUN Tianyu;YU Gaokun(Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学,青岛266100

出　　处：《应用声学》2022年第3期481-489,共9页Journal of Applied Acoustics

基　　金：国家自然科学基金项目(11674293)。

摘　　要：该文旨在宽开口的共鸣腔内嵌入聚氨酯泡沫来设计一种新型的水下低频共鸣器。首先通过水池实验测定聚氨酯泡沫板的声速。然后基于此建立镶嵌聚氨酯泡沫共鸣器的理论模型获得声阻抗率,通过与直口结构以及棒纵振动模型对比,验证理论模型的正确性,并建立集中参数系统,分析内嵌聚氨酯泡沫能够降低共鸣器共振频率的原因。最后通过有限元仿真软件进行计算,检验理论模型的正确性,与无聚氨酯泡沫镶嵌的共鸣器相比,镶嵌聚氨酯泡沫的共鸣器在维持较低品质因素的同时实现了共振频率大幅降低。The purpose of this paper is to design a new type of underwater resonator,which is embedded with polyurethane foam in a tube.First,the sound velocity of the polyurethane foam is determined by a water-tank experiment.Second,a theoretical model is developed to obtain the specific acoustic impedance at the inlet of resonator,and its validity is confirmed by comparing the theoretical results in the two special conditions with the results obtained by a tube model and the longitudinal vibration model of a rod.Furtherly,a lumped-parameter model is established and the reason why the resonance frequency can be reduced by the polyurethane foam is analyzed.Finally,the finite element simulation software is used to verify the theoretical model.Compared with the resonator without polyurethane foam,the resonator embedded with polyurethane has an advantage in obtaining a lower resonance frequency with a low quality factor.

关 键 词：低频共振 聚氨酯泡沫 水下共鸣器 

分 类 号：O427.9[理学—声学]