摘要
H ilbert-Huang变换(HHT)是一种处理非线性、非平稳信号的新方法。它通过经验模态分解将信号分解为有限个固有模态函数,并对每个固有模态函数进行H ilbert变换得到H ilbert谱。本文将这种方法应用于地震信号动力特性的提取,有效地获得了信号能量的时频分布,量化提取了中心频率、瞬时相位、瞬时能量、H ilbert能量、最大振幅对应的时频分布等动力特性,并与Fourier变换、小波变换等进行了比较,显示了HHT的优势以及对于进一步实现结构分析和控制的重要意义。
Hilbert-Huang transform （HHT） is a new method for dealing with non-linear and non-stationary data. By using this method, any signals can be decomposed into a finite number of intrinsic mode functions （IMF） and then Hilbert spectrum is obtained by Hilbert transform. In this paper, the new method is used in extracting dynamic properties of seismic signals. The energy time-frequency distribution can be effectively acquired. Several dynamic properties, such as center frequency, instantaneous phase, instantaneous energy, Hilbert energy and time-frequency distribution with respect to maximum amplitude are extracted. In addition, by comparing HHT with Fourier transform and＇wavelet transform, the advantage of HHT and its considerable significance for structural analysis＆ structural control are shown.
出处
《地震工程与工程振动》
CSCD
北大核心
2006年第5期41-46,共6页
Earthquake Engineering and Engineering Dynamics
基金
教育部博士点专项科研基金项目(20040386004)
