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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 of the elastomer and the scattering equation of the target, the acoustic scattering characteristics of some water-filled and structural elastic spherical shells are studied by FEM and BEM (finite element method) and boundary element method (FEM / BEM) Partially filled with the normalized scattering morphological function, analysis of the resonant scattering mechanism. The results show that the resonant properties of partially filled and non-clapboard spherical shells are mainly related to water-filled conditions. Resonance is caused by the interaction of the internal aqueous medium and the spherical shell. The main resonance characteristics of partially filled and clapboard spherical shells are related to The characteristics of the anhydrous case are similar, the sound field in the internal water layer is weak, indicating that the resonance characteristics are mainly determined by the spherical shell and the separator. However, when one side of the separator is filled with water, the scattering characteristics of the spherical shell and partial water filling with large differences.