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交通流突变点的无标度特征分析?
Analysis of scale-free characteristic on sharp variation p oint of tra?c flow
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摘要: 交通流时间序列在不同时间尺度上具有不同的波动特征。为了分析交通流的突变特征，以一段实际的交通流量序列为研究对象进行实证研究。采用小波变换的方法求得交通流在不同尺度上的突变点，按照小波函数过零点数目将交通流的尺度划分为若干层次，并分析了交通流突变的层次性。计算表明：以突变点数目为测度时，在一定的尺度范围内，交通流在突变层次上的突变点数目满足自相似性特征。因此，交通流的突变在不同尺度上具有无标度性。Abstract: Tra?c flow time series at different time scales have different fluctuation characteristics. In order to analyze the discontinuity characteristics of tra?c flow, a tra?c volume time series is adopted as an empiric study objective. The multi-scale sharp variation points of the sequence are obtained by using wavelet transform. The scales are divided based on the corresponding number of the zero-crossing points of wavelet transform, and the hierarchy of the scales is analyzed. The results of calculation indicate that the number of sharp variation points of the tra?c flow on a mutation scale is self-similar in a certain scale if the number of the sharp variation points is used as a measure. So, sharp variations of the tra?c flow in different scales are scale-free.
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