基于HHT方法的爆炸应变波时频分析  

Joint time-frequency analysis of blast strain wave based on Hilbert-Huang transformation

作　　者：杨仁树[1,2] 高祥涛[1] 车玉龙[1] 解北京[3] 

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083 [3]中国矿业大学(北京)资源与安全工程学院,北京100083

出　　处：《振动与冲击》2014年第10期17-21,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金重点项目(51134025);国家自然科学基金(51274204);高等学校博士学科点专项科研基金(20110023110018)

摘　　要：为探究固体介质中爆炸应变波信号特征,采用Hilbert-Huang Transform(HHT)方法对爆炸应变波信号进行时频分析;讨论爆炸应变波信号EMD分解及时频能分布特征,并将HHT分析结果与Short Time Fourier Transform(STFT)对比;通过分析爆炸波在空气、岩石介质中传播的数值模拟结果与爆炸应变波在有机玻璃中传播的动光弹实验结果,探讨爆炸波信号多频率作用特征。结果表明,爆源近中区爆炸应变波主频率在几百千赫兹到几兆赫兹范围内;HHT方法明显表现出爆炸应变波传播的细节特征;固体介质中爆炸应变波信号波形为由不同频率波动共同作用结果。In order to investigate blast strain wave signal characteristics,here,Hilbert-Huang Transformation （HHT）was applied to analyze the time-frequency spectra of blast strain wave signals.Empirical mode decomposition and Hilbert spectral analysis for blast strain wave signals were discussed.Comparison between HHT and short time Fourier transformation （STFT）of blast wave signals was done.Multi-frequency interaction of blast wave signals in air and rock was discussed with numerical simulation,and the signal characteristics were studied with dynamic photo-elastic tests.It was demonstrated that the main frequencies of blast strain wave are within a range of few hundreds kHz to few MHzs in a field close to a borehole;HHT method can be used to show the details of the explosion strain wave propagation characteristics;the blast strain wave profile is formed due to the interaction of waves with different frequencies.

关 键 词：爆炸力学 爆炸应变波 时频分析 HHT 强动载 

分 类 号：O383[理学—流体力学]