;近距水下爆炸作用下箱形梁模型中垂破坏试验研究

PDF(1829 KB)

振动与冲击 ›› 2011, Vol. 30 ›› Issue (2) : 19-23.

论文

;近距水下爆炸作用下箱形梁模型中垂破坏试验研究

黄晓明; 朱锡; 牟金磊; 李海涛

作者信息 +

Experimental study on sagging damage of box-beam model subject to close range underwater exploration

HUANG Xiao-ming ; ZHU Xi ; MU Jin-lei ; LI Hai-tao

Author information +

文章历史 +

摘要

利用大型室内爆炸筒对两个水面箱形梁模型进行近距水下爆炸试验，用高速摄影记录模型在气泡作用下的运动变形及中垂破坏过程。试验发现，气泡收缩时，近距船底边界阻碍流体运动并在气泡上方产生空化区域，增加了气泡负压的作用强度和作用时间，是模型发生中垂破坏的主要原因。同时，当模型垂向振动频率与气泡脉动频率接近时，冲击波引起的模型垂向振动与气泡负压作用叠加，增加了模型发生中垂破坏的可能。试验研究了爆距的改变对气泡负压作用以及冲击垂向振动幅值的影响。试验结果表明，只有当爆距小于2倍气泡最大半径时，近距边界效应不可忽略。

Abstract

A close range underwater explode test on two box-beam models was made in blast cube. High speed photography was applied to capture the sagging damage process of the model subjected to bubble movement. Experimental results show that when bubble shrink, close range hull bottom boundary blocked the fluid movement and form cavities area up the bubble, enhanced the bubble’s negative pressure effect in intension and duration. The close range boundary effect is the first cause of model’s sagging damage. And when the model’s vertical vibrate frequency nearby the frequency of bubble pulsation, the model’s vertical vibration caused by shock wave superposed with bubble’s negative pressure effect, enhanced the possibility of sagging damage of model. The influence of blast distance to bubble’s negative pressure effect and vertical vibrate induced by shock wave are made. The results indicated that only when the blast distance was less than twice bubble’s maximum radiuses, the close range boundary effect cannot be ignored.

导出引用

黄晓明;朱锡;牟金磊;李海涛. ;近距水下爆炸作用下箱形梁模型中垂破坏试验研究[J]. 振动与冲击, 2011, 30(2): 19-23

HUANG Xiao-ming;ZHU Xi;MU Jin-lei;LI Hai-tao. Experimental study on sagging damage of box-beam model subject to close range underwater exploration[J]. Journal of Vibration and Shock, 2011, 30(2): 19-23