摘要
利用小波变换、S变换、Wigner-ville分布(WVD)和Hilbert-Huang变换(HHT)对模拟信号进行时频分析并比较,结果表明基于经验模态分解的HHT具有更强的适应性,能较为准确地提取信号的时变特征。利用HHT对实际记录的宽频带爆破振动信号进行了时频分析,其结果较为准确地描述了信号的时变特征。
We compare the time-frequency spectrums of analog signal which was determined by continuous wavelet transform (CWT), S-transform, Wigner-Ville distribution (WVD) and Hilbert-Huang transform (HHT) . The results show that HHT based on empirical mode decomposition (EMD) has higher adaptability and can ac- curately extract the time-frequency characteristics of the explosion signal. Then we analyze time-frequency spec- trum of broadband explosion vibration signal in actual by HHT, and time-frequency analysis results accurately described the time varying characteristics of the explosion vibration signal.
出处
《地震研究》
CSCD
北大核心
2013年第1期103-107,142,共5页
Journal of Seismological Research
基金
国家自然科学基金重点项目(40534021)资助