纤维爆炸索水下爆炸声信号特征的小波分析  

Characteristics of underwater detonation acoustic signals of fiber-based detonating cord based on wavelet analysis and power spectrum

作　　者：贾虎[1,2] 沈兆武[1] 

机构地区：[1]中国科学技术大学近代力学系,合肥230027 [2]南阳师范学院土木建筑工程学院,南阳473061

出　　处：《振动与冲击》2011年第9期243-247,共5页Journal of Vibration and Shock

基　　金：中国博士后基金特别资助项目(201003799);河南省教育厅自然科学研究计划项目(2011B130002);安徽高校省级自然科学重大项目(KJ2010ZD003);南阳师范学院高层次人才科研启动费资助项目

摘　　要：为了研究纤维爆炸索爆炸水声信号特征,在获得水下爆炸压力测试结果的基础上,对其进行了声压级分析,并采用小波变换对水下爆炸信号进行了时频特性分析,讨论了水下爆炸声信号在各频段的能量分布状况。研究结果表明,纤维爆炸索水下爆炸具有很强的声功率,纤维爆炸索水下爆炸声信号能量主要集中在40 kHz以内,尤以5 kHz以下频带能量最高,如果作为水声干扰源,完全可以覆盖各类水声器材的各工作频段,或许能在水声对抗中发挥重要作用。采用小波分析可以对纤维爆炸索爆炸水声信号特性进行合理研究,达到准确分析信号特征的目的。With a view to obtaining the characteristics of the underwater detonation acoustic signals of fiber-based detonating cord,its sound pressure level was analysed based on the results of underwater explosion pressure tests.The energy distribution of underwater detonation signals at different frequency ranges was discussed by analyzing the time frequency characteristics of those underwater explosion signals by adopting the wavelet transform method.The results show that the underwater explosion of fiber-based detonating cord boasts a high level of acoustic power and that the energy of the underwater detonation signals of fiber-based detonation cord is mainly concentrated in the area of less than 40kHz,and the highest level of energy is below the frequency of 5kHz.Therefore,if used as a source of sound interference,the fiber-based detonating cord is fully capable of covering all the working frequencies of various types of underwater acoustic equipment,as a result of which it may serve an important purpose in underwater warfare.By using wavelet transform,the characteristics of the underwater acoustic signals of fiber-based detonating cord can be studied resonably and analysed accurately.

关 键 词：纤维爆炸索 水下爆炸 小波分析 能量 

分 类 号：TF12[冶金工程—粉末冶金] TH213.3[冶金工程—冶金物理化学]