空中爆炸下舰船桅杆结构动态响应的数值模拟

对某舰的桅杆结构及相关甲板,用Lagrange单元进行模拟,桅杆周围的空气用Euler单元进行模拟,Lagrange单元和Euler单元耦合界面采用一般耦合方法.运用动力有限元软件MSC/DYTRAN进行计算,欧拉方程求解时使用具有二阶精度的Roe求解器,用MSC/PATRAN进行前后处理,模拟了桅杆结构在空中爆炸下的全过程.从计算结果可以得到爆炸冲击波的传播过程,桅杆结构中各点的加速度、速度、位移、应力响应.分析爆炸冲击波的比冲量及靠近桅杆结构的冲击波峰值压力表明本文计算结果是合理的;计算中考虑了流固耦合效应,模拟出了冲击波的反射和绕流,更加接近实际情况.因此文中的研究,对桅杆抗爆设计具有一定的参考价值.

Numerical simulation of the dynamic response of vessel mast structure under air explosion

A fluid-structure coupling finite element model is established,which consists of Lagrange element simulating mast structure and deck,and Euler element simulating air around the mast.Mast and air are coupled with general couple method.The model is calculated by MSC/DYTRAN where the Euler equations are solved with second-order Roe solver,and MSC/PATRAN is used for pre-processing and post processing.Then the process of mast structure under air explosion is simulated.The propagation of explosion shock wave,responses of acceleration,velocity,displacement and stress of every point on the mast can be available according to the numerical calculation.The analysis of special impulses of shock wave and the peak pressures approximate to mast shows that the results gained in the paper are reasonable.Shock wave reflection and flow around the mast are simulated,which is more close to reality.Therefore,the simulation research has some reference value to mast anti-explosion design.