【摘要】 应用正交Hilbert-Huang变换,对地铁引起的地面振动信号进行频谱分析.首先,利用正交的经验模式分解方法,得到地铁引起地面振动信号的相互间完全正交的固有模式分量,对各阶固有模式分量进行Hilbert谱分析,进而得到Hilbert边际谱.然后,通过对地面振动信号的Hilbert边际谱进行分析,获得其频谱特性.将地铁引起地面振动信号的Hilbert边际谱和Fourier谱进行比较,指出两种谱分析方法分析地铁引起地面振动信号频谱特性的差异.最后根据Hilbert变换的线性性质,得到消除背景振动、纯粹由地铁运行引起地面振动的频谱特性.更多还原

【Abstract】 The spectral analysis for recorded vibration data of ground motion induced by subway is studied by using orthogonal Hilbert-Huang transformation(HHT) in this paper.At first,orthogonal intrinsic mode functions(IMF) of the ground vibration data are obtained based on the orthogonal empirical mode decomposition method.The Hilbert spectral analysis is applied to the IMF components to achieve the marginal Hilbert spectra of the data.Then,the frequency characteristics of the ground vibration data are obtained through analyzing the marginal Hilbert spectra.Therefore,the differences of the frequency distributions of the ground vibrations calculated by the orthogonal HHT method and the Fourier spectral analysis method are revealed.Finally according to the linear property of HHT,the background vibration is eliminated from the ground vibration data measured at site and the real frequency distributions of the ground vibrations are extracted.更多还原