考虑任意来流方向的运动力源辐射声压解析式  

An analytical solution for sound pressure generated by a moving force considering arbitrary inflow direction

作　　者：马瑞贤[1] 刘占生[1] 吴桂华 张广辉[1] 何鹏[1] MA Rui-xian;LIU Zhan-sheng;WU Gui-hua;ZHANG Guang-hui;HE Peng(School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学能源科学与工程学院,哈尔滨150001

出　　处：《船舶力学》2020年第10期1354-1362,共9页Journal of Ship Mechanics

基　　金：国家自然科学基金资助项目(11572098)。

摘　　要：以脉动力为来源的噪声是舰船流噪声的主要来源之一,其产生和传播受流体介质流动和声源运动的影响。为了获得考虑攻角条件下运动力源流噪声声压解析式,本文采用运动介质法,建立了以集中脉动力为声源的非齐次对流波动方程,基于任意来流方向的自由空间对流格林函数求解波动方程,并推导了在源时间(声发射时间)域内的辐射声压解析式。与基于运动声接收点方法的声压解析解进行了对比分析,给出了不同来流条件和声源运动状态下解析式的简化形式。在流动介质中静止点力源和运动点力源辐射噪声预报的验证算例中,得到的近场声压、远场声压及总声压的空间指向性和衰减特性均验证了本文噪声预报方法的准确性。Force-induced fluid noise is one of the dominant sources of ships’self-noise,which is affected by medium movement and source movement during the generation and propagation of acoustic waves.In order to obtain the analytical solution of the fluid-induced sound pressure from a moving force source with angular in⁃flow,the non-homogeneous convective wave equation with a point fluctuation force as the source is estab⁃lished.A free-space Green’s function for a moving medium in arbitrary direction is implemented to solve the wave equation,and then an analytical formulation of radiated sound pressure is derived in the source(emis⁃sion)time domain.The derived formula is compared with the moving-observer-based analytical solution of acoustic pressure,and several simplified equations which can be applied to different inflow conditions and various source movement cases are proposed.The approach is validated by the well agreement of the nearfield,far-field and total sound pressure between the analytical results for the noise from a steady point force and moving point forces in steady uniform flow.

关 键 词：流噪声 对流波动方程 脉动力声源 运动介质 运动声接收点 

分 类 号：U661.44[交通运输工程—船舶及航道工程]