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结合试验要求,对直升机气囊应急着水砰击问题进行了简化处理,建立简化模型,并根据流固非线性耦合理论建立状态方程。然后用有限元知识,运用ANSYS/LS-DYNA软件,用数值计算方法对直升机浮囊着水砰击在同一工况下进行分析,得出直升机浮囊水平速度、加速度随时间变化曲线;并分析不同仰角、偏航角及垂直速度下,样机的应急着水冲击载荷和水平速度变化规律,最后得出分析结论。
According to the requirements of the experiment, the helicopter airbag emergency water slamming problem is simplified, a simplified model is established, and the equation of state is established according to the fluid-solid nonlinear coupling theory. Then, using ANSYS / LS-DYNA software, the numerical simulation method is used to analyze the helicopter float lashing in the same working condition with the knowledge of finite element method. The horizontal velocity and acceleration of the helicopter floating capsule with time curve are obtained and analyzed. Under different elevation angles, yaw angles and vertical velocities, the variation of the impact load and the horizontal velocity of the prototype on the emergency response are analyzed. Finally, the conclusion is drawn.