排序方式: 共有17条查询结果,搜索用时 15 毫秒
1.
2.
Based on the traditional Smoothed Particle Hydrodynamics (SPH) algorithm, the linked-list search algorithm combined with the variable smoothing length and square support domain was put forward to improve the calculation efficiency and guarantee the calculation accuracy. The physical process of high velocity fragment impact on a broadside liquid cabin was programmed for simulation. The numerical results agreed well with those of the general software ANSYS AUTODYN, which verifies the effectiveness and feasibility of the numerical method. From the perspective of the outer plate thickness of the liquid cabin, the width of the liquid cabin, and incident angle of the fragment, the influence of these parameters on protective mechanisms was analyzed to provide a basis for protective design of a broadside liquid cabin. Results show that the influence of outer plate thickness is not obvious; therefore, the conventional design can be adopted in the design of the outer plate. The width of the liquid cabin has a great influence on the residual velocity of the fragment and the width of the liquid cabin should be designed to be as wide as possible under the premise of meeting other requirements. There is a certain incident angle in which the velocity attenuation of the fragment is most obvious, and the high-pressure zone near the inner plate is asymmetric. The inner plate of liquid cabin should be strengthened according to the hull form, principal dimensions, and vulnerable points. 相似文献
3.
建立了简化的气泡射流模型,研究射流冲击对船体板产生的毁伤效应,得出了射流速度、射流位置以及射流形状对结构毁伤的影响规律。研究发现射流冲击速度对结构的破坏具有决定性作用,射流形状对毁伤效果亦有较大影响,射流冲击位置对结构的破坏影响不大,以上结论为舰船的防爆抗爆提供了参考。 相似文献
4.
近自由面水下爆炸冲击波切断效应研究 总被引:3,自引:0,他引:3
近自由面水下爆炸形成的冲击波到达自由面时会反射稀疏波,并伴随着水面的上升、破碎和飞溅等复杂物理现象。文章基于无网格SPH方法建立了近自由面水下爆炸数值模型,开发了计算程序,模拟了冲击波和自由面反射的稀疏波的相互作用过程,分析了切断现象的特性、产生机理以及对冲击波参数的影响。研究发现,爆心正上方且距自由面较近处,稀疏波作用最强;近自由面爆炸冲击波冲量可衰减为无限水域爆炸的1/3左右。文中的研究旨在探索冲击波在自由面处的传播规律,并为近自由面水下爆炸载荷的确定提供参考。 相似文献
5.
7.