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| 1 | Numerical study on the case effect of a bomb air explosion显示文摘When considering the bomb explosion damage effect,the air shock wave and high-speed fragments of the bomb case are two major threats.In experiments,the air shock wave was studied by the bare explosives superseding the real cased bomb;in contrast,the bomb case influence was ignored to reduce risk.The air explosion simulations of the MK84 warhead with and without the case were conducted.The numerical simulation results showed that the bomb case significantly influenced the shock wave generated by the bomb:the spatial distribution of shock wave in the near field changed,and the peak value of shock wave was reduced.Breakage of the case and kinetic energy of the fragmentation consumed 3 and 38% of the explosion energy,respectively.The increasing factors of the peak overpressure induced by the bare explosive on the ground and in the air were 1.43-3.04 and 1.37-1.57,respectively.Four typical stages of case breakage were defined.The mass distribution of the fragments follows the Mott distribution.The initial velocity distribution of the fragments agreed well with the Gurney equation. | Guo-qiang Deng Xiao Yu | 2021 | Defence Technology(防务技术)2021，17，4： | 3 |
| 2 | 一种多药包水下阵列爆炸威力场计算方法显示文摘水下阵列爆炸威力场体积计算方法研究有助于提高舰艇水下防御能力。为了简单准确地计算出三维模型水下阵列爆炸威力场的体积大小,文中利用AUTODYN软件中将一维结果映射至三维模型的功能,提出一种快速估算仿真结果的方法,将水下爆炸威力场边界拟合成圆,近似成阵列球体进行研究,减少了仿真计算量。通过与SolidWorks建模所得数据对比可知,文中方法可通过威力场横截图形的径向尺寸估算三维模型水下爆炸威力场的大小,并得出结论:同一时刻的水下爆炸冲击波形成的威力场基本不受冲击波相互作用的影响。文中研究可为简化水下阵列仿真计算以及舰艇有效防御鱼雷攻击提供参考。 | 彭天一 刘荣忠 高科 郭锐 | 2020 | 水下无人系统学报2020，28，3： | 0 |
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