钛合金导流罩结构抗冲击计算

导流罩结构作为舰艇结构重要的首部结构形式,其在水下爆炸载荷作用下的抗冲击性能不容忽视。为研究导流罩结构的抗冲击性能,以某船钛合金导流罩结构为研究对象,应用大型有限元计算软件ABAQUS,建立有限元模型,采用声固耦合法进行水下爆炸数值仿真计算。通过模拟导流罩结构在船上的安装边界条件,设定水下非接触爆炸冲击工况,计算得到了导流罩结构在爆炸冲击载荷作用下的等效塑性应变、位移、加速度等动态响应,并给出了基阵安装位置的频率特性和冲击环境。研究表明,导流罩底部外板为导流罩结构的危险区域,导流罩基阵安装位置处的响应以中低频段为主。

Anti-Shock Calculation of Titanium Alloy Fairwater Domes

The fairwater dome is a crucial head structure of naval ships,and its anti-shock performance subjected to underwater explosion is of vital importance.In this paper,a finite element model of titanium alloy fairwater dome was established resorting to the finite element calculating software ABAQUS,on which the numerical simulation of underwater explosion was conducted through coupled acoustic-structur al analysis.By selecting the proper boundary condition of the fairwater dome on board installation and the impulsive condition of non-contact underwater explosion,dynamic responses including the equivalent plastic strain（PEEQ）,displacement,acceleration of the fairwater dome were obtained.The frequency characteristic and the impact environment at the array location were also presented.The result shows that the bottom outer plate is the most fragile part of the fairwater dome,and the frequency response of the in stalled array consists of mainly low and intermediate frequencies.