交通荷载下路面振动响应信号的时频特征分析

本文在简单分析了Fourier变换、短时Fourier变换和小波变换的基础上,以实测的交通荷载路面振动信号为模拟信号,采用小波包对模拟信号进行时频特征分析,并结合Fourier变换,给出了小波包各分解重构信号随时间的衰减规律及其在各子频带的频谱图,因此,结合Fourier变换对信号进行小波包分析是一种有效的信号处理途径.研究结果对今后交通荷载作用下路面路基动力响应计算模型的初始边界条件的确定提供依据,为路面路基动力响应的计算奠定基础.

Time-frequency Characteristic Analysis of Pavement Vibration Response Signals under Traffic Loadings

In this paper,based on the simply analysis of Fourier transform,short time Fourier transform and wavelet transform,using the spot monitoring traffic loadings pavement vibration response signals as simulation signals,and applying Wavelet Packet to analyse the time-frequency characteristic of simulation signals,and combining with Fourier transform,the time-reduce law of every reconstruct signals by Wavelet Packet decomposed and the frequency-spectral chart of different frequency bands are yielded,thus it is a effective signal disposal method to use Wavelet Packet combining with Fourier transform to analyse signals.The research result provides foundation for original boundary condition of pavement-bed dynamic response account model under traffic loadings,and establishes elements for account of pavement-bed dynamical response.