开孔结构流激腔振机理及控制方法研究  

Study on Vibration Mechanism and Control Method of Flow Path in Open-Hole Structure

作　　者：于滨 陈志坚[1] 唐宇航[1] 

机构地区：[1]海军工程大学舰船工程系,湖北武汉430033

出　　处：《兵器装备工程学报》2018年第1期46-52,83,共8页Journal of Ordnance Equipment Engineering

基　　金：国家自然科学基金项目(51679244);青年科研发展基金项目(425517K232)

摘　　要：为研究水下结构空腔振动的形成原因及振动特性,从单孔声腔动力学模型入手,采用赫姆霍兹共鸣器理论结合数值计算验证了计算模型的准确性,在克服传统解析方法局限性的基础上实现了对实际复杂结构的数值预报;探究了有限元法与流固耦合方法的差异性,对不同开孔型式、开孔数量下的腔体内声场分布特征进行分析,完成了空腔结构的腔内声压及辐射声压计算;通过在腔内覆盖吸声层的方法,对比分析了几种方案减振降噪效果的差异性及参数影响规律;结果表明:空腔开口处的声压作用会引起腔内的共振,且在空腔内壁覆盖吸声层对于空腔的减振降噪具有一定的效果。In order to study the formation cause and vibration characteristics of the cavity vibration in the underwater structure,this paper started with the dynamic model of single hole cavity,using the Helmholtz resonator theory and numerical calculation,it verified the accuracy of the model. The numerical prediction of the actual complex structure is realized on the basis of overcoming the limitation of the traditional analytic method. Then it explored the difference of the finite element method and the fluid-solid coupling method. And it analyzed the distribution of the sound field in the cavity under different opening type and opening numbers,and calculated the sound pressure and the radiation pressure of the cavity. Through the method of covering the sound absorption layer into the cavity,it compared and analyzed the influence of several schemes on the effect of vibration and noise reduction and the influence of the different parameters.The results show that the sound pressure at the opening of the cavity can cause resonance in the cavity,and the sound absorption layer covering the inner wall of the cavity has a certain effect on the vibration and noise reduction of the cavity.

关 键 词：腔振 减振降噪 赫姆霍兹共振法 有限元 流固耦合 吸声材料 

分 类 号：TB533[理学—物理] TB535[理学—声学]