水中沉底爆炸压力信号时频特征分析  

Analysis of time-frequency characteristics of underwater bottom explosion pressure signals

作　　者：张姝红 ZHANG Shuhong(Unit 91388,Dalian 116041,China)

机构地区：[1]91388部队,辽宁大连116041

出　　处：《兵器装备工程学报》2024年第6期47-52,95,共7页Journal of Ordnance Equipment Engineering

摘　　要：受装药当量变化和海底边界影响,水中沉底爆炸压力信号时频特征和能量分布与小当量装药在自由场条件下爆炸相比具有明显变化。为获取水中沉底爆炸压力信号特征,利用实测压力数据,采用小波分析方法进行分析,得到了信号不同时频下的特征和能量分布。分析结果表明:压力信号在4 kHz以下频段能量占比超过95%,250 Hz以下频段能量超过75%,250 Hz以下频段峰值压力占比为39%,能量和峰值压力分布均向更低的频段集中;冲击波时段能量占比达64%,滞后流时段能量占比为30%,而二次压力波时段能量占比不到6%,爆炸能量主要集中在冲击波和滞后流时段,因此在沉底爆炸条件下舰艇结构和设备抗冲击响应分析时,在频域应重点关注低频段影响,在时域应重点关注冲击波和滞后流时段的影响。Due to changes in charge equivalent and the influence of seabed boundaries,the time-frequency characteristics and energy distribution of underwater explosion pressure signals undergo significant changes compared to the explosion of small equivalent charges under free field conditions.In order to obtain the characteristics of underwater bottom explosion pressure signals,measured pressure data was used to analyze using wavelet analysis method,and the characteristics and energy distribution of the signals at different time frequencies were obtained.The analysis results show that the energy proportion of pressure signals in the frequency band below 4 kHz exceeds 95%,the energy proportion in the frequency band below 250 Hz exceeds 75%,and the peak pressure proportion in the frequency band below 250 Hz is 39%.The energy and peak pressure distribution are concentrated in the lower frequency band;The energy proportion during the shock wave period exceeds 64%,and the energy proportion during the after-flow period is about 30%,while the energy proportion during the secondary pressure wave period is about 6%.The explosion energy is mainly concentrated in the shock wave and after flow periods.Therefore,when analyzing the impact response of ship structures and equipment under the condition of underwater explosion,the focus should be on the low-frequency band in the frequency domain,and the impact of the shock wave and after flow period in the time domain.

关 键 词：水中爆炸 冲击波压力 气泡脉动 小波分析 时频特征 

分 类 号：TJ06[兵器科学与技术—兵器发射理论与技术]