基于动态子结构法的加筋圆柱壳冲击环境预报

Impact Environment Prediction of Stiffened Cylindrical Shells based on Dynamic Substructure Method

目前舰艇冲击环境预报已越来越受到各国海军重视,其主要的研究手段包括有限元数值仿真和实船水下爆炸试验。由于实船试验耗费大量人力、财力资源且受实验环境干扰较大,不具备重复性,而现代计算机技术发展使得有限元数值仿真模拟舰艇大型复杂结构提供可能,但是舰船局部细化设计过程中,修改局部参数仍然需要对整体结构进行仿真计算,计算机仿真过程中依旧消耗大量计算资源、时间成本。以简易加筋圆柱壳结构为对象进行冲击响应求值计算,提供一种基于子结构方法的舰艇整体结构模态信息求解方法和水下爆炸载荷作用下冲击环境预报技术。达到了既能保证数值仿真精度又能降低计算成本的目的。

At present, impact environment prediction of ships has been paid increasingly attention of many countries. The main research methods include finite element simulations and underwater explosion experiments. Due to the large economic and labor consuming and environment interference, the real ship experiments do not have repeatability. While the development of modern computer technology makes it possible to simulate large and complex ship structures by finite element simulation. In the process of warship local refinement design, the whole structure still needs to be simulated and calculated in order to modify local parameters. However, this simulation still needs large amount of computation resources and time. In this paper, a substructure-based approach is provided to solve the modal information of a warship ' s whole structure and predict the impact environment subject to underwater explosion loads. With a simple reinforced cylindrical shell as an object, its impact response is calculated with this method. The results show that the accuracy of numerical simulation is ensured and the computation cost is reduced.