With the coupling of exterior and interior sound field,the boundary element method(BEM) of acoustic analogy was expanded to include the scattering by fluid body underwater.

• 为研究水下目标的耦合声散射问题；将声类比边界元技术应用于内声场、并考虑流体目标内外声场的耦合；建立了水下运动流体目标声散射的物理模型和数值方法.