In order to study the movement after damping and the attitude of floating of the helicopter with emergency floatation bags. An arbitrary Lagrangian Eulerian (ALE) solver and a penalty coupling method were used for predicting the fluid-structure interaction forces. The finite element model contains Lagrangian shell elements for a helicopter with emergency air-bags and Eulerian solid elements for the water and air. Based on the Navier-Stokes equations, the simulation of three-dimensional numerical wave tank was built by ALE algorithm, adopt the method of numerical simulation, setting up the model with coupling of the helicopter and wave tank, obtain the moving posture after helicopter damping, the results show that the helicopter's roll angle between 0° ～ 14° before overturning, the configuration of the helicopter with airbag has good floating characteristics, which is conducive to the development of water rescue.%为了研究带应急气囊直升机着水后的运动和漂浮的姿态,通过ALE与罚函数方法求解流固耦合作用响应.有限元模型中包含直升机拉格朗日壳单元和欧拉流体单元,基于N-S方程,采用ALE方法实现了三级海况规则波的建立;采用数值模拟计算的方法,建立直升机与风浪载荷相耦合的模型,得出了直升机着水后的运动响应,结果表明,直升机在倾覆之前横摇角度保持在0°～14°之间,带应急气囊直升机的构型具有很好的漂浮特性,有利于水上救生的开展.
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