BALLISTIC WAVES IN HIGH-SPEED WATER ENTRY
BALLISTIC WAVES IN HIGH-SPEED WATER ENTRY
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DOI：
10.1006/jfls.1997.0103
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发表时间：
1997-10
影响因子：
3.6
通讯作者：
M. Lee;R. Longoria;D. Wilson
中科院分区：
文献类型：
--
作者：
M. Lee;R. Longoria;D. Wilson
摘要对物体高速撞击和穿入水中时压力波（弹道波）的产生和传播进行了解析和数值研究。分析模型原则上适用于预测任何实际感兴趣的射弹的弹道波。该理论是一般性的，足以处理倾斜和/或多个穿透，是有效的，在亚音速和超音速的影响，相对于水。弹丸辐射的弹道波被表示为代表运动点源响应的垂直分量和代表源横截面响应的水平分量之间的卷积。衍射效应所造成的有限大小占包括水平压力分量。还考虑了超声速穿透过程中可能发生的时间倒置现象。该方法提供了有价值的洞察所产生的压力场的渗透机制。用非线性波程序进行了数值计算，结果与理论分析吻合得很好。
Abstract The generation and propagation of pressure waves (ballistic waves) by a body impacting and penetrating into water at high speed are investigated both analytically and numerically. An analytical model is, in principle, applicable for predicting ballistic waves by any projectiles of practical interest. The theory is general enough to handle oblique and/or multiple penetrations, and is valid for impacts at subsonic and supersonic velocities with respect to water. The ballistic waves radiated by a projectile are expressed as a convolution between the vertical component, which represents the response of a moving point source, and the horizontal component, which represents the response of the cross-section of the source. Diffraction effects resulting from the finite size are accounted for by including the horizontal pressure component. A time inversion phenomenon which can occur during supersonic penetration is also considered. The approach provides valuable insight into the pressure field generated by the penetration mechanisms. Numerical results are obtained by using a nonlinear wave-code, and these are in good agreement with the analytical predictions.