潜射导弹出水载荷数值算法研究

摘要

潜射导弹在水中航行时,表面被空泡包围,这就造成其出水时,带来较大的载荷冲击.出水冲击载荷需要知道整个表面上的压力分布,但是这在工程实践中是不可能实现的.本文采用有限元流固耦合仿真程序,对潜射导弹整个出水过程进行数值模拟.根据数值计算结果,依据理论力学的基本原理,计算出潜射导弹所受到的冲击力与冲击力矩,利用NASTRAN瞬态载荷解算器,计算出潜射导弹各截面最大响应弯矩.结果表明,本文提出的方法能够对潜射导弹出水过程提供数值预测与安全评估.%The high-speed missile in water is wrapped by cavitations,which implies a heavy water-exit load.It is essential to obtain the pressure distribution as whole in order to compute the load.However,it is not possible in reality.In this paper,the water-exit process is simulated by the FEM (finite element method) liquidsolid coupling method.Based on some fundamentals of the theoretical mechanics,the impact and the impact moment are computed.Using NASTRAN,the maximum corresponding bending moments in all cross-sections are obtained.The results show that the computation in this paper can predict and assess the water-exit process of the vehicle.