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中文摘要：
一个分析方法被建议在二层的液体由装底部的圆形的柱体分析放射和衍射 ofwater 波浪。分析表情 foradded 质量和抑制系数，以及圆形的 cylinderwere 的波浪刺激力量由一个特徵函数扩大方法获得了。在二层的液体的 bottom-mountedcircular 柱体上的水动力学力量包括不仅增加的团和抑制系数， butalso 表面的波浪力量和内部波浪的模式。这与 ahomogenous 液体的盒子不同。一些例子被给，证明密度层化能有在大量频率上的这些水动力学力量上的 relativelarge 效果。
英文摘要：
An analytical method was proposed to analyze the radiation and diffraction of water waves by a bottom-mounted circular cylinder in a two-layer fluid. Analytical expressions for added mass and damping coefficients, as well as the wave excitation forces of the circular cylinder were obtained by an eigenfunction expansion method. The hydrodynamic forces on the bottom-mounted circular cylinder in a two-layer fluid include not only the added mass and damping coefficients, but also the wave forces of the surface and internal-wave modes. This is different from the case of a homogenous fluid. Some examples were given, showing that density stratification can have a relative large effect on these hydrodynamic forces over a wide range of frequencies.
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