基于AUTODYN软件的水下爆炸数值模研究
毕业论文关键词：水下爆炸，冲击波，加筋板，气泡脉动 ABSTRACT In the modern war, naval battle is inevitable, surface ships as an important base of sea warfare, the vitality of the ship represents its combat capability. Therefore, it is necessary to study the numerical simulation of underwater explosion. In this paper, theoretical analysis and numerical simulation are used to study the propagation of underwater explosion shock wave load and the dynamic characteristics of bubbles in the vicinity of free field and boundary. Firstly, the AUTODYN program was used to establish a one-dimensional finite element model, and numerical simulation was carried out on the propagation of shock wave and the pulsation of bubbles in 1.47kg ball shaped TNT. It is found that the pulsation phenomenon of bubbles is consistent with the theory. The numerical simulation results of the shock wave at the peak value are in line with the empirical formula. Then, the influence of different grid pision and different boundary conditions on the peak pressure of the shock wave is discussed. The influence of different mesh pision on the accuracy of numerical simulation was found, and the reflection effect of different boundary conditions was also found. Followed by the application of AUTODYN finite element program a 2D axisymmetric calculation model, by the different working conditions setted, the same burst from the different charge and same charge different explosion distance of dynamic response of stiffened plate frame, the stiffened plate frame of the maximum displacement and measuring point velocity curve, so as to obtain the dynamic response of stiffened plate under the action of shock wave frame. Finally, the establishment of the free field, near the free surface and rigid boundary water finite element model of the explosion， By adjusting the distance parameter. Through test and numerical calculation results are compared, so as to get the AUTODYN in underwater explosion has a good accuracy in the numerical simulation.
Key words： Underwater explosion, shock wave, stiffened plate, bubble pulsation
目 录
第 1 章 绪论 . 1
1.1立题背景及研究意义 1
1.2水下爆炸研究领域发展的历史和现状 .. 1
1.2.1水下爆炸理论分析的发展现状 . 2