水下爆炸冲击载荷作用时船舶冲击环境仿真

以某船的船体结构和型线为基础，建立有限元分析模型，利用ANSYS／LS－DYNA程序计算了船体在不同炸药当量、起爆位置、有限元网格划分时的冲击环境，分析了船体在不同工况下的冲击响应。计算结果分析表明：在一定的条件下ANSYS／LS－DYNA有限元软件计算水下爆炸冲击环境是可行的。所得主要结论如下：（1）流场中结构的存在导致冲击波的反射、绕射使流场压力偏小或偏大；（2）冲击响应沿船长方向非线性传播；（3）存在一个临界K值，当K超越该值时，船体冲击环境发生突变，产生全局性的冲击响应；（4）在上层建筑中，冲击加速度并非呈线性分布，冲击加速度的大小与上层建筑各层刚度有关；（5）由于上层建筑的刚度与船体刚度呈非连续过渡，故船体冲击环境在上层建筑上将发生畸变。

Research on Simulation of Underwater Shock Environment of Ship

The FEM aralysis model is established based on the structure and form lines of a ship. The urderwater shock environment is calcnlated for different TNT masses, detonation positions and FEM mesh structures respectively by ANSYS/LS DYNA program. The dynamic responces under the different conditions are analyzed. The results show the feasibility of the calculation. The main conclusions are: (1) the structure in the flow field causes the reflection and diffraction of the shockwaves, which lead to the inerease or decrease of fluid pressure; (2) the shockwave response spreads non linearly in the direction of ship length; (3) there exists a critical value of K . The sudden change of the ship shock environment will occur when K is over the value; (4) the shock aceerelation distribution is not linear in the super structure, the amplitudes of the aceerelations are related to the rigidities of every layer of the structure; (5) there will be shock environment distortion in the superstructure due to the non continous transion between the rigidities of the superstructure and the hull.