两装药水下爆炸毁伤目标振动信号时频分析  

Time-frequency analysis of vibration signal of underwater target subjeeted to underwater explosion of two explosive charges

作　　者：张志华[1] 李万[1] 罗荣[1] 李大伟[1] 

机构地区：[1]海军工程大学兵器工程系,武汉430033

出　　处：《振动与冲击》2013年第9期79-83,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金(50775218);海军工程大学博士生创新基金(HGBSJJ2011009)

摘　　要：针对某水下目标抗水下爆炸试验数据,研究两装药水爆炸下冲击波的相互作用及气泡脉动的相互作用现象,分析非平稳结构响应信号时频特征,分别提取前爆冲击波、后爆冲击波及前爆气泡脉动三个不同时段信号进行能量与频率分析,并由此确定不同时段对目标毁伤的影响。结果表明,后爆冲击波能量最大,前爆冲击波与后爆冲击波均处于较宽频率范围,主要作用在780 Hz以上,前爆气泡脉动能量主要作用在100～400 Hz内。与结构自振频率频段重合,因此前爆气泡脉动作用不可忽视。With the experiment data of a underwater target subjected to underwater explosion, the interactions between the shock waves and between the bubble pulsations induced by the explosions of two charges were investigated and the time-frequency characteristic of the structure response, being a non-stationary random process, was analyzed. The first shock wave, the second shock wave and the first pressure pulse were extracted from the signal, their energy distribution was analyzed and the respective influences of the signal in different periods on the target were assessed. Results from the investigation show that the frequencies of main frequency components of the first and second shock waves are higher than 780 Hz in a wide frequency range the second shock wave processes the largest energy, and the frequencies of main frequency components of the first pressure pulse are between 100 Hz and 400 Hz which may also cause the damage of the underwater structure, because the natural frequency of the structure is also in this frequency band.

关 键 词：水下爆炸 两个装药 小波变换 HHT变换 冲击波 气泡脉动 

分 类 号：O383[理学—流体力学] TJ363[理学—力学]