基于船波相对运动的砰击压力和上浪载荷预报方法

Method to predict slamming pressure based on the relative motion model test of ship and waves

本文基于船波相对运动理论,对舷侧砰击压力和甲板上浪载荷的数值及试验预报方法分别进行了研究。利用三维势流理论计算船舶与波浪之间的相对运动,可以得到船波相对速度及甲板上浪高度。对于砰击压力通过数值模拟方法得到砰击压力系数后结合船波相对速度来预报;对于上浪载荷则采用考虑船舶航速的溃坝模型结合甲板上浪高度来预报。此外,开展了船舶运动和砰击压力模型试验,船波相对运动由沿着模型横剖面布置在舷侧的浪高仪测量,并且测得了相应位置处的砰击压力。最后分别对船波相对运动和砰击压力的数值结果与试验数据进行了比较分析,同时基于船波相对运动给出了一种砰击持续时间计算方法。

The method to predict the flare slamming pressure and the wave load on deck is investigated numerically and experimentally in this paper based on the relative motion theory.A 3D potential flow theory is used to calculate the relative motion between a ship and waves,then the ship-wave relative velocity and the wave height on the deck can be obtained.The slamming pressure is predicted by the slamming pressure coefficient obtained by numerical simulation method combined with ship-wave relative velocity,meanwhile,the wave load on dick is predicted by dam-break model considering the ship's speed combined with the wave height.Furthermore,a series of ship motion and wave loads experiment of that ship are carried out in the towing tank.In the test,the relative motion between the ship and wave surface are recorded by a wave probe which is set along the side of the ship model,and the slamming pressure is measured by pressure sensors at several positions.The comparison analysis of the numerical results and the experimental data is carried out.The characteristics of the slamming pressure,including the pressure peak and the lasting time of the slamming are studied.