Influence of traffic randomness on control effect of coordination system(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年03期
- Page:
- 97-105
- Research Field:
- 交通工程
- Publishing date:
Info
- Title:
- Influence of traffic randomness on control effect of coordination system
- Author(s):
- LI Yuan; GONG Xiao-fang; CHENG Yan-qiu; LIU Da-peng; HUANG Xin-zhi
- 1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. School of Gardening Landscape Design, Jiangxi Agricultural University, Nanchang 330045, Jiangxi, China; 3. Civil Engineering Department, Yancheng Institute of Technology, Yancheng 224051, Jiangsu, China; 4. College of Construction Management, Jiangsu Vocational Institute of Architectural Technology, Xuzhou 221116, Jiangsu, China
- Keywords:
- traffic engineering; coordination system; traffic randomness; traffic speed fluctuation; traffic arrival rate fluctuation
- PACS:
- U491
- DOI:
- -
- Abstract:
- In order to improve stability and control effect of coordination system, the influence mechanisms of traffic speed fluctuations and traffic arrival rate fluctuations on control effect of coordination system were discussed, aiming at traffic randomness through theoretical analysis and simulation calculation. In theoretical analysis, fluctuant traffic speed was transformed into interval numbers, change interval of idea phase difference was obtained based on calculation formula of one-way coordination phase difference. Analytical relationships among traffic arrival rate fluctuation and optimal cycle, coordination phase green time, average traffic delay time, maximum queue length were gained based on calculation formula of phase empty reliability. Furthermore, based on numerical method of two-way coordination system phase difference, the phase green time-difference with respect to traffic arrival rate fluctuation variance was obtained. In simulation analysis, simulation platform was established by MATLAB and VISSIM. Two signal intersections with regular geometric alignment were chosen, and simulation scheme of coordination control was made. With the indexes consisted of average traffic parking time, average queue length, average traffic stops, average traffic delay time, influences of control effect of coordination system were evaluated in three situations that considering traffic speed fluctuations only, considering traffic arrival rate fluctuations only and considering both of which to make simulation. The results show that control effect is positively related to variance of traffic speed fluctuation and variance of traffic arrival rate fluctuation. The effect of traffic speed fluctuation is greater than that of traffic arrival rate fluctuation, both simultaneous fluctuation is not a simple superimposition relationship, but offset each other, so that control effect is between the two cases. In the case of only traffic arrival rate fluctuation, control effect of coordination phase bilateral traffic arrival rate fluctuation is better than that of unilateral traffic arrival rate fluctuation. When traffic flow is in the state of switch between free flow and congested flow, control effect is superior to the congested flow state, and inferior to the free flow state.
Last Update: 2017-06-06