部分充水有隔板弹性球壳的声散射  

Sound scattering from partially water-filled elastic spherical shell with plate

作　　者：孙阳[1] 徐海亭[1] 

机构地区：[1]中国科学院声学研究所北海研究站,青岛266023

出　　处：《声学学报》2007年第4期369-374,共6页Acta Acustica

摘　　要：根据弹性体运动方程和目标散射的积分方程,应用有限元和边界元方法(FEM/BEM)研究部分充水、结构弹性球壳的声散射特性,并计算了球壳内有、无隔板和部分充水情况的归一化散射形态函数,分析了谐振散射机理。结果表明,部分充水、无隔板球壳的谐振特性主要与充水情况有关,谐振是由内部水介质与球壳共同作用产生的;部分充水、有隔板球壳的主要谐振特性与无水情况的特性相差不大,内部水层中的声场较弱,说明谐振特性主要由球壳和隔板决定,但是,隔板一侧充满水时,球壳的散射特性与部分充水情况有很大不同。According to the equation of motion in the elastic medium and integral equation of target scattering,the sound scattering from the elastic spherical shell with and without an inner plate is studied using the finite element and boundary element method, and the scattering normalized form functions of the shell with and without the plate filled with different volume of water are computed and the mechanism of resonance scattering is analYzed. The results show that the resonance of the shell with partially water-filled and without the plate is mainly related to the volume of water, and the resonance is caused by inner water and the spherical shell. The resonance characteristics of partially water-filled elastic shell with the plate are similar to that of vacuum structured elastic spherical shell, and the sound field in inner water is weaker which indicates the main resonance characteristics are decided by spherical shell and the plate. In addition, the scattering characteristics of spherical shell with plate and one side full water-filled are greatly different from the partially water-filled ones.

关 键 词：声散射特性 弹性球壳 无隔板 充水 谐振特性 边界元方法 积分方程 目标散射 

分 类 号：TB56[交通运输工程—水声工程]