基于FEM-SPH耦合算法的飞机水上迫降的力学建模与分析

Model and Numerical Simulations of Water Ditching by FEM-SPH Coupling Method

水上迫降是飞机安全性能的重要内容之一,飞机结构入水冲击过程中伴随着流固耦合效应.基于FEMSPH耦合算法建立了具有实际飞机外形的三维力学计算模型;为验证本文模型的有效性,在刚性结构情况下,与国外文献中已有模型进行比较;进一步采用接近于实际情形的弹塑性结构,对飞机以不同入水攻角、不同下降速度和不同水平速度撞击水面的过程分别进行了模拟和比较,获得定性意义上的初步结论.

Water ditching contains fluid-structure coupling effect. It is one of the important indicators of aircraft safety performance. A 3-D mechanical computing model based on FEM-SPH coupling method is established. In the case of rigid structure, the numerical results verify the effectiveness by comparing with existing models in former literature. Using elastic-plastic structures and with different entry angle of attack, different drop speed and different forward speed, simulation and comparison are made respectively, and preliminary conclusions in qualitative sense are obtained.