近距水下爆炸作用下箱形梁模型中垂破坏试验研究  

Sagging damage test of box-beam models subjected to close range underwater explosion

作　　者：黄晓明[1] 朱锡[1] 牟金磊[1] 李海涛[1] 

机构地区：[1]海军工程大学船舶与动力学院,武汉430033

出　　处：《振动与冲击》2011年第2期19-23,共5页Journal of Vibration and Shock

基　　金：国家安全重大基础研究基金资助项目(51335020101)

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。A close range underwater explosion 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 showed that when the bubble shrinks,the close range hull bottom boundary blocks fluid movement and forms cavities area up the bubble,enhances the bubble＇s negative pressure effects including intensity and time duration,so the close range boundary effect is the main cause of model＇s sagging damage;and when the model＇s vertical vibration frequency is close to the frequency of the bubble pulsation,the model＇s vertical vibration caused by shock waves superposes with the bubble＇s negative pressure effects,they increases the possibility of sagging damage of the model;the influence of the blast distance on the bubble＇s negative pressure effects and the vertical vibration induced by shock waves is studied.The results indicated that only when the blast distance was less than twice the bubble＇s maximum radius,the close range boundary effect cannot be ignored.

关 键 词：水下爆炸 近距 中垂破坏 高速摄影 试验研究 

分 类 号：U661.6[交通运输工程—船舶及航道工程]