关键词: 多重分形, 多重分形消除趋势波动分析, 交通流时间序列, 广义hurst指数

Abstract: In order to analyze the complex characteristic of traffic flow on expressway, multifractal detrended fluctuation analysis method have adopted to calculate the general hurst index of traffic flow time series. The result show that the capacity time series and speed time series are multifractal, capacity time series has more fluctuation than speed time series. The general hurst indexes of rearranged time series which disrupt the order of original series have been calculated, the rearranged general hurst indexed are not 0.5 and far smaller than the original series, then, the multifractal characteristic most decide by the long distance relevance, and has certain relation with the probability density.

Key words: multifractal, multifractal detrended fluctuation analysis, traffic flow time series, general hurst index