水消声器结构声耦合机理及性能试验研究

项目名称： 水消声器结构声耦合机理及性能试验研究

项目编号： No.51509232

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 其他

项目作者： 宣领宽

作者单位： 中国舰船研究设计中心

项目金额： 20万元

中文摘要： 船舶水管路系统与舷外水直接相连，是一条重要的噪声传递途径且效率极高，常采用消声器降低通海管口噪声辐射。消声器声学性能准确预测是水消声器的设计及水管路系统噪声控制的基础，目前水消声器声学性能预测简单类比空气消声器方法，很少考虑结构声耦合对水消声器声学性能的影响，理论结果与试验测试数据偏离严重，亟需揭示水消声器结构声耦合机理。本项目拟基于连续介质力学开展水消声器结构声学理论研究，并在此基础上建立板壳理论结构声耦合有限体积法数值分析模型，基于改进的时域脉冲法预测水消声器的声学性能，研究结构壁厚、材料属性及边界条件变化等对水消声器声学性能的影响，归纳总结结构声耦合对水消声器声学性能的影响机理，并在厚壁静止水管路系统上进行试验验证，为水消声器声学性能的设计预测及水管路系统噪声控制提供支撑。

中文关键词： 水消声器；结构声耦合；消声性能；数值模拟；试验研究

英文摘要： The water piping system of ship is attached directly to the outboard water, and is an important and efficient noise propagation path. In order to reduce the noise radiation of the sea pipe, the water muffler is often used. Accurate predicting the acoustic attenuation performance of the water muffler is the basis of the water muffler design and the piping system noise control. At present, the predicting method of the acoustic attenuation performance learns from the air muffler experience, and the effect of the interaction between the structure and the water on the water muffler’s acoustic attenuation performance is often ignored. The predicting result doesn’t agree with the experimental result. The structural and acoustic coupling mechanism of the water muffler needs to understand. Based on the continuum mechanics theory, this project is to study the structural and acoustic coupling theory of the water muffler and establish the finite volume method numerical analysis model to study the structural acoustic coupling of plate and shell structures. An improved time-domain impulse method is applied to predict the acoustic attenuation characteristics of the water muffler. The effect of the structure thickness, the material property and the boundary condition on the water muffler’s acoustic attenuation performance is investigated by this numerical analysis model. The influence mechanism of structural acoustic coupling on attenuation performance of the water muffler is summarized. The influences of the bench test are investigated to validate the predicted result. The present research would provide support for the design and predicting of the water muffler and the noise control of the water piping system.

英文关键词： water muffler;structural acoustic coupling;attenuation performance;numerical simulation;experimental investigation