舟船空投入水姿态与过载特征分析

Analysis of Entry Attitude and Overload Characteristics of Ships in Water

舟船空投入水时将承受较大的垂直和侧向过载,将对舟船的结构强度、稳定性产生不利影响,通过控制船体入水俯仰角可减小此过载。为研究船体入水角度对减载的影响规律,利用LS-DYNA对不同角度下船体着水过程进行了仿真,得到不同工况下着水过程加速度变化曲线,并通过水上跌落试验对仿真计算结果进行了验证,结果表明通过采取合理的入水角度,可有效降低船体入水过载。本文所做工作可为舟船空投系统着水减载提供依据。

A ship will bear large vertical and lateral overloads when dropped into water,which imposes adverse effects on the structural strength and stability of the ship.The overloads can be reduced by controlling the pitching angle of the ship.In order to study the influence of the pitching angle on overload reducing,LSDYNA is used to simulate the landing process at different angles.The acceleration curves of landing process under different working conditions are obtained,and the simulation results are verified by the fall-down test.The results show that the reasonable entry angle can effectively reduce the ship’s water overloads.The work in this paper can provide the basis for the landing load reduction of the sea airdrop system.