Open AccessAnalysis of scale-free characteristic on sharp variation point of traffic flow
Author(s) -
Yong Zhang,
Li Shi-Gao
Publication year - 2014
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.63.240509
Subject(s) - variation (astronomy) , scale (ratio) , flow (mathematics) , point (geometry) , statistical physics , computer science , mechanics , physics , mathematics , geometry , astrophysics , quantum mechanics
Traffic flow time series at different time scales have different fluctuation characteristics. In order to analyze the discontinuity characteristics of traffic flow, a traffic 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 traffic 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 traffic flow in different scales are scale-free.