复杂地形下平台水弹性响应研究

在以往的研究中,波浪对浮体的水动力响应作用大多采用有限均匀水深或无限水深情况进行计算,考虑实际复杂地形对浮体性能影响的研究较少,但事实上地形的变化对浮体影响不可忽略,尤其岛礁附近区域珊瑚礁地形复杂,需要考虑地形对波浪场的影响。文章先从简单情况入手,入射波浪采用有限水深均匀入射波,使用有限水深格林函数求解源强,但加入了地形对浮体波浪绕射和辐射的影响。基于这些假定,验证了该方法计算结果的准确性,进而对某浮式平台在复杂地形下的水动力进行计算,并与均匀有限水深的结果进行比较,两者总体趋势吻合。结果表明,地形的存在对低频区运动响应影响较大,相比均匀水深波动较大。该文可以为浮体在实际地形下水动力响应计算研究工作的开展提供一个参考。

Hydroelastic response of platform in complex seabed condition

In the past research,the infinite water depth or finite water depth Green function was used to simulate the hydrodynamic performance of floating body without considering the effect of real seabed. However, the influence of real seabed should not be ignored, especially in the around zone of island. In this paper, the simple condition was considered and a series of assumptions were added which included: us-ing finite water depth incident wave formula; considering the effect of seabed when solve the diffraction and radiation forces; using finite water depth green function to solve the source strength matrix. Based on these assumptions, the simple model was validated firstly. Then, the hydrodynamic parameters of a type of platform in complex seabed were calculated and the results were compared with the corresponding results solved in constant water depth. The results show that the trends are consistent, but in low frequencies, the motion responses varying dramatically.The study in this paper could provide a reference for the further re-search on floating body with real seabed.