摘要
针对虚拟点源法声场计算时精度不高的问题,提出一种求解平板结构声辐射特性的虚拟面源方法。根据平板的边界条件,采用模态展开法确定结构的表面振速,基于波叠加原理将平板辐射的声场等效成平板一侧空间中连续分布虚拟面源辐射声场的叠加,并采用插值形函数对虚拟面源进行离散。在此基础上,根据欧拉定理,构建关于面声源节点与结构表面振速之间的关系方程,从而确定虚拟面声源强度,以此计算声辐射特性参数。以水中无限大障板上简支矩形板为例,将所提方法计算结果与常规虚拟点源法计算结果进行比较,并讨论声学参量对虚拟面声源数的敏感性。结果表明,所提方法相对传统虚拟点声源方法计算精度更高,且在低频段仅需较少的等效源数即可准确预报结构的辐射声功率。
A virtual surface source method is proposed to solve the problem of low accuracy in the calculation of the sound field using the virtual point source method.Based on the boundary conditions of the flat plate,the surface vibration velocity of the structure is determined using modal expansion method.Based on the principle of wave superposition,the sound field radiated by the flat plate is equivalent to the superposition of the continuous distributed virtual surface source radiation sound field in the space on one side of the flat plate,and the virtual surface source is discretized using interpolation shape function.On this basis,according to Euler's theorem,a relationship equation between the surface acoustic source node and vibration velocity of the structural surface is constructed,to determine the intensity of virtual surface acoustic source and calculate the acoustic radiation characteristic parameters.Taking a simply supported rectangular plate on an infinitely large baffle in water as an example,the calculation results of the proposed method are compared with those of the conventional virtual point source method,and the sensitivity of acoustic parameters to the number of virtual surface sound sources is discussed.The results indicate that the proposed method has higher computational accuracy compared to traditional virtual point sound source methods,and can accurately predict the radiated sound power of structures with fewer equivalent sources at the low frequency band.
作者
徐魁
刘宝
胡金华
XU Kui;LIU Bao;HU Jinhua(Department of Electronic Engineering,Naval University of Engineering,Wuhan 430033,Hubei,China;Department of Early Warning and Intelligence,Air Force Early Warning Academy,Wuhan 430033,Hubei,China)
出处
《声学技术》
北大核心
2025年第4期475-480,共6页
Technical Acoustics
基金
国家重点研发计划资助项目(2022YFC3103801)
国家自然科学基金资助项目(12104510)
中国博士后面上基金资助项目(2022M723882)。
关键词
虚拟面声源
波叠加
模态展开
平板结构
virtual surface source
wave superposition
mode expansion
plate structure
