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《Journal of Vibration and Shock》 2011-09
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Characteristics of underwater detonation acoustic signals of fiber-based detonating cord based on wavelet analysis and power spectrum

JIA Hu1,2,SHEN Zhao-wu1 (1.Department of Modern Mechanics,University of Science and Technology of China,Hefei 230027,China; 2.School of Civil Engineering and Architecture,Nanyang Normal University,Nanyang 473061,China )  
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.
【Fund】: 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
【CateGory Index】: O383
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