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首页> 外文会议>IUTAM Symposium on Diffraction and Scattering in Fluid Mechanics and Elasticity Jul 16-20, 2000 Manchester, United Kingdom >A 2-D MODEL OF THE INTERACTION BETWEEN A PRESSURE WAVE AND A SUBMERGED SANDWICH PANEL
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A 2-D MODEL OF THE INTERACTION BETWEEN A PRESSURE WAVE AND A SUBMERGED SANDWICH PANEL

机译：压力波与水下夹芯板相互作用的二维模型

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The interaction between an underwater shock wave and homogeneous plates and shells has been investigated by many authors and therefore is elaborated in details in most respects. However it is not possible to assert the same about extending the developed approaches to the interaction of a pressure wave and submerged sandwich plates. In this case it is necessary to point out two main features of the problem which make its solution rather complicated. At first, although a number of theories to solve static problems of sandwich plates and beams are now developed, it is not at all clear whether it is possible to apply them for solving transient problems in dynamics, where the effect of transverse squashing is essential, so that a use of 'classical' sandwich plates theories may be dangerous. Secondly, a negative pressure generated by a deformable surface of a fast moving panel surface leads to appearance of cavitation zones in the fluid which may drastically change the process of a fluid-structure interaction. If the process of a shock wave reflection from an elastic panel is considered, then it is found that the pressure in a reflected wave is decreasing with a decrease in a panel thickness and at last gaps in water appear. The 'tail part' of an incident shock wave reflects from these gaps as a wave of rarefaction, and may generate new gaps at a certain distance from them and so on. The amount of such gaps depends on the shape and the amplitude of an incident shock wave. Thus, details of the pressure field at each time instant become important even if simplified sandwich plate theory in general may correctly predict the deformation of plate surface with cavitation not taken into account. Apparently, numerical modelling is a more realistic way to describe all possible physical effects. Some of such numerical modelling is done in this paper.
机译：许多作者已经研究了水下冲击波与均质板壳之间的相互作用，因此在很多方面都进行了详细说明。但是，不可能就将开发的方法扩展到压力波和浸入式夹心板之间的相互作用提出相同的主张。在这种情况下，有必要指出问题的两个主要特征，这使其解决方案相当复杂。首先，尽管现在已经开发出许多解决夹层板和梁静力学问题的理论，但尚不清楚是否有可能将它们用于解决动力学中的瞬态问题，而横向压扁的影响至关重要，因此使用“经典”夹心板理论可能很危险。其次，由快速移动的面板表面的可变形表面产生的负压导致流体中出现气蚀区域，这可能会大大改变流体-结构相互作用的过程。如果考虑从弹性面板反射冲击波的过程，则发现反射波的压力随着面板厚度的减小而减小，并且最后出现水间隙。入射冲击波的“尾部”以稀疏波的形式从这些间隙中反射出来，并且可能在距它们一定距离处产生新的间隙，依此类推。这些间隙的数量取决于入射冲击波的形状和幅度。因此，即使简化的夹心板理论通常可以正确地预测不考虑气蚀的板表面变形，每个时刻的压力场细节也变得很重要。显然，数值建模是描述所有可能的物理效应的更现实的方式。本文进行了一些此类数值建模。

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