水下目标在水下爆炸作用下冲击响应的时频特征  

Time-frequency characteristics of shock responses of underwater target to underwater explosion

作　　者：李万[1] 张志华[1] 周峰[2] 张涛[1] 

机构地区：[1]海军工程大学兵器工程系,湖北武汉430033 [2]北京环球信息应用开发中心,北京100094

出　　处：《爆炸与冲击》2012年第3期309-315,共7页Explosion and Shock Waves

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

摘　　要：基于某水下目标的抗水下爆炸实验数据,利用小波变换良好的时频局部化性质对监测的水下目标内部装置冲击加速度信号进行时频特征分析,得到了不同频带上冲击信号振动分量的时间历程曲线和能量分布。结果表明,基于冲击信号小波时频特征分析的频带能量可以同时反映冲击振动的强度、频率和持续时间对目标损伤的影响,同时结合不同频带的时间历程曲线可以获得冲击波和二次压力波在不同频带上的分布和衰减的细节信息,由此可确定冲击波和二次压力波各自对目标毁伤的影响。Based on the experimental data of an underwater target subjected to underwater explosion,the time-frequency characteristics of the monitored interior acceleration signals were studied by means of wavelet analysis with high resolvability and localization.By using these signals,the acceleration-time curves and the energy distributions in different blasting frequency bands were obtained.The analyzed results show that the wavelet energy in a given frequency band can coinstantaneously reflect the influences of vibration strength,frequency,and duration on the damage effect of the underwater target.And the distribution and attenuation detail information of the shock wave and secondary pressure wave in different frequency bands was obtained by combining the acceleration-time curves in different blasting frequency bands.Thereby,the influences of the shock wave and the secondary pressure wave on the damage effect of the underwater target can be assessed,respectively.

关 键 词：爆炸力学 时频特征 小波变换 水下目标 水下爆炸 冲击波 

分 类 号：O383[理学—流体力学] TJ363[理学—力学]