无航速三体浮驳水动力特性频域分析

为了研究不同工作条件下无航速三体浮驳的水动力特性的变化规律，根据势流理论和波浪的辐射/衍射理论对无航速三体浮驳的水动力特性进行了分析，并以某三体浮驳为例应用水动力计算软件AQWA对其在不同工况下进行了水动力计算。分别求得了该三体浮驳在不同水深、不同吃水深度时的附加质量、附加阻尼、不同波向下的波浪激励力和幅值响应算子随波频的变化曲线，并对其进行了对比分析。结果表明，水深对三体浮驳附加质量、附加阻尼、波浪激励力和幅值响应算子均有较大的影响，特别是在低波频时影响较为显著；水深大于20倍吃水深度后三体浮驳的水动力系数可按照无限水深进行近似计算。吃水深度对三体浮驳纵荡和横荡幅值响应算子几乎无影响，对垂荡和纵摇幅值响应算子的影响较小，对横摇和艏摇幅值响应算子的影响较大。

Analysis of hydrodynamic properties for trimaran barge without forward speed

In order to study the hydrodynamic properties of trimaran barge under different working conditions, the theories of potential flow and diffraction/radiation are used to analyze the hydrodynamic mass and damping coefficients, wave exciting forces and RAOs (Response Amplitude Operators) of a trimaran barge under different conditions. Taking a trimaran barge as an example, the hydrodynamic properties of the barge are analyzed by using of the software of AQWA. Apart from the added mass and added damping curves, the wave exciting forces and RAOs curves depending on wave regular frequencies in the different water depth and different draught depth are obtained and compared. The results indicate that the water depth has obvious influence on the added mass, added damping, wave exciting forces and RAOs. The influences are obvious in the domain of lower wave frequencies. When the water depth being bigger than 20 times of the draught depth, the hydrodynamic coefficients are similar to those in the infinite depth water. The draught has obviously influence on the RAOs of roll and yaw, has a little influence on the RAOs of heave and pitch, but the influence on the RAOs of surge and sway could be neglected.