小水线面双体船砰击概率

Prediction of SWATH Slamming Probability

为得到不同海况对小水线面双体船砰击概率的影响,基于势流理论中的Rankine面源法对该船的波浪砰击进行研究。通过挪威船级社(Det Norske Veritas,DNV)水动力软件SESAM的Wasim模块,预报该船在不同速度、不同海况下的短期运动响应,获得不同海况、不同速度下该船湿甲板的波浪砰击压力。研究7种海况下的不同吃水对砰击概率的影响,结果表明:该船的运动响应均随着航速的增加和海况的恶劣而增大;与航速相比,海况对双体船的运动响应影响较大。预报点离艏部越近,相对速度和相对运动值越大;该船的砰击概率随着海况的恶劣而增大,但当吃水增加时,砰击概率会减小。

The SWATH（ Small Water Plane Area Twin-Hull Ship） slamming is studied with Rankine panel method in potential flow theory. The short-term motion responses of SWATH sailing at different speed under different sea conditions are predicted by Wasim module of SESAM,giving the wet-deck slamming pressures under respective conditions. The influence of hull draft on slamming probability is also studied. The study concludes that the motion response of SWATH has positive relation to the sea condition and ship speed and the influence of the sea condition is greater than that of ship speed. The relative velocity and the relative motion value go greater when the predicting point moves closer to the ship bow. Slamming probability of SWATH increases in heavy sea. Increase the draft can decrease the slamming probability.