基于CEEMDAN-Hilbert变换的水下爆炸信号时频分析方法研究  

Research on Time-frequency Analysis Method of Unde rwater Explosion Signal Based on CEEMDAN-Hilbert Transform

作　　者：樊涛 王宪楠 吴岩 赵爽[1] 郭策安[1] 张健[1] FAN Tao;WANG Xiannan;WU Yan;ZHAO Shuang;GUO Cean;ZHANG Jian(Shenyang Ligong University,Shenyang 110159,China)

机构地区：[1]沈阳理工大学装备工程学院,沈阳110159

出　　处：《沈阳理工大学学报》2024年第5期20-26,共7页Journal of Shenyang Ligong University

基　　金：辽宁省教育厅高等学校基本科研项目(LJKZ0272)。

摘　　要：研究水下爆炸冲击波信号的时频特性,对于舰艇利用弹药水下爆炸信号对抗自导鱼雷具有重要的实际意义。本文针对EMD-Hilbert方法中经验模态分解(EMD)存在模态混叠的问题,提出CEEMDAN-Hilbert方法实现水下爆炸冲击波信号精确的时频分析。在水深100 m处单发炸药爆炸,产生爆炸信号的频率主要分布在56.5 kHz以下的低频段,特别是0~28.3 kHz以下的能量最大,高于56.5 kHz的能量较少。通过与EMD-Hilbert方法相比,CEEMDAN-Hilbert方法在28.3~56.5 kHz频段的能量分布会更加明显,具有一定的优越性。The study on the time-frequency character istics of underwater explosion shockwave sig-nals is of great practical significance for ships t o utilize the underwater explosion signals of muni-tions against self-guided torpedoes.The CEEMDAN-H ilbert method is proposed to realize the accu-rate time-frequency analysis of underwater explosi on shockwave signals in response to modal alias-ing in the empirical modal decomposition(EMD)of the EMD-Hilbert method.In a single explosion at the depth of 100 m in the water,the frequency of t he generated explosion signal is mainly distrib-uted in the low frequency band below 56.5 kHz,espe cially the energy below 0~28.3 kHz is the largest,and the energy higher than 56.5 kHz is les s common.By comparing with the EMD-Hilbert method,the energy distribution of CEEMDAN-Hilbert method in the frequency band of 28.3~56.5 kHz will be more obvious,which has certain su periority.

关 键 词：水下爆炸 CEEMDAN-Hilbert变换 Hilbert谱 本征模态分量 

分 类 号：O381[理学—流体力学]