【作者】 蔡宗义； 吴祖堂； 门朝举； 陈立强；

【Author】 Cai Zongyi,Wu Zutang,Men Chaoju,Chen Liqiang (Northwest Institute of Nuclear Technology,710024,Xi’AN)

【机构】 西北核技术研究所；

【摘要】 介绍了Hilbert-Huang变换(HHT)的基本原理,基于HHT方法完成了对爆炸地运动信号的经验模态分解(EMD),得出了一组固有模态函数(IMF),给出了Hilbert时频分布。研究结果表明:HHT变换在分析非平稳信号时具有自适应性,分解后的固有模态函数能反映信号本身所固有的特性,能将地运动信号能量清晰地表示在能量分布图上。HHT方法能有效地提取爆炸地运动信号的时频特征,在岩土介质中地运动传播规律研究方面有较好的应用前景。更多还原

【Abstract】 The basic principle of Hilbert-Huang transform(HHT) was briefly introduced in the paper. Based on the empirical mode decomposition(EMD),the ground motion signal was decomposed into a series of intrinsic mode function(IMF),and the time-frequency energy spectrum was obtained.The results show that HHT method is adaptive,the empirical mode decomposition method could efficiently decompose the ground motion signal into intrinsic mode functions reflecting the intrinsic characteristics of the signal, and the signal energy could be clearly shown on the Hilbert energy spectrum.Besides,the HHT method could draw time-frequency characteristics from ground motion signal and could be used to research the rules of ground motion spreading.更多还原