水下爆炸对船板冲击作用仿真

根据DAA1近似建立了一种简单实用的用于分析船板水下冲击响应模型。模型基于流-固作用原理，在不考虑结构低频响应的情况下，得到了可直接作用于结构湿面的总的压力载荷表达式。利用有限元代码LS—DYNA的用户定义的分布载荷子程序实现了这一方法。该方法适用于求解在早期冲击波作用下，结构的高频响应和局部变形。采用该方法对水下冲击波对船板和加筋船板(气背条件)的作用进行了仿真计算。计算机模拟结果表明采用该方法，在保证较高精度的前提下可以大大地降低CPU时间，提高仿真计算效率。

Computer Simulation of Response of Ship Hull to Underwater Shock

A practical model has been presented to analyze the response of ship hull to underwater shock according to DAA1 approximation. The equation of the total pressure loaded on the wet surface of the hull has been formulated based on fluid - structure interaction principle without considering low frequency responses of the hull. The model is implemented into the user - defined distributed loading subroutine of the finite element code LS - DYNA and is applicable to solve the high frequency response and local deformation under early shock waves. The dynamic responses of unstiffened naval hulls and stiffened navel panels to underwater shocks have been investigated using the presented method. The simulation results indicate that the method can reduce CPU time significantly and improve simulating efficiency with good precision.