基于HHT方法的公路运输振动信号时频分析

目的分析具有非线性、非平稳特征的公路运输振动信号的时频信息。方法利用Hilbert-Huang变换算法,在对公路运输的振动信号进行EMD分解的基础上,开展Hilbert谱和各IMF的功率谱密度计算,并与常规的功率谱进行比较。结果基于IMF分量的功率谱可以克服传统Fourier功率谱计算在低频偏低、高频偏高的误差。结论基于HHT的公路运输振动信号时频分析方法是一种有效的运输振动非平稳信号分析手段。

Frequency Analysis for Vibration Signal from Road Transportation Using HHT

Objective To study the time-frequency character of the vibration signal from road transportation which is nonlinear and non-stationary. Methods Using the Hilbert-Huang transformation algorithm, the vibration signal from road transportation was firstly decomposed by the EMD method, based on which its Hilbert spectrum and the power spectral density were calculated and compared to the traditional Fourier power spectral density. Results The power spectral density of the IMFs can overcome the error of low value in low frequency and high value in high frequency by the traditional Fourier method. Conclusion The HHT algorithm is a powerful method to analyze the time-frequency character of the nonlinear nonstationary vibration signal from road transportation.