Study On Comprehensive Evaluation Of On-ramp Chaos Control In Freeway

The highway is to provide high-speed vehicles, safety is the primary purpose ofroad transport facilities. But with the economic development and gradually into thefamily car, the traffic demand is increasing, the highway facing traffic congestion andtraffic safety and other issues. Road traffic congestion has become a serious problemworldwide, both from an economic, social, or from the environment, safety point ofview, to improve road traffic congestion, improve road capacity is an important issueto be solved. In our country, especially in northern areas, a large number of coaltransport vehicles pulling on the highway, caused serious traffic congestion. In orderto guarantee the basic characteristics of highway, its existence must be properlyresolve traffic problems.Traffic control is to solve the problem of traffic congestion effective means toimprove the utilization efficiency of road and traffic safety. For highway controlmethods and strategies although there were more, but these theoretical approach doesnot involve traffic chaos. Road traffic is a highly uncertain nonlinear time-varyingsystems, disordered, fractal, chaos exists in the process of the evolution of the system,and from nonlinear science, chaos control perspective to study traffic flow control isthe one with important topics at the forefront. Existing highway chaos control studieshave proven its effectiveness, but these studies emphasis on chaos controller designand control the effectiveness of such mechanism, the need for highway chaos controlperformance index after in-depth study to analyze effectiveness of the control andspecific results.This paper analyzes the mechanism of chaos control highway, expresswaycontrol methods and specific control system is described. Comprehensive evaluationas a priority, ramp control for chaotic effect of efficiency, fairness point of view of thedifferent relevant indicators, the establishment of a highway chaos control effectcomprehensive evaluation index system. Furthermore, the analysis of a variety ofdifferent evaluation methods, evaluation based on chaos ramp control its owncharacteristics, proposed using principal component analysis method based onweighted evaluation method, which uses gray correlation method to determine theweight of each index, while the introduction of the Gini coefficient concept applies itsanalysis of control effectiveness fairness tendencies. To specific sections of a highway, using the proposed method based on weightedprincipal component analysis evaluation method to validate the method. Taking intoaccount the increasing social equity weights ramp ramp user needs and mainlineupstream flows are larger in case the use of better; while in other cases, simply rampusers and mainline users treated equally, take the same weight, ie the pursuit of theobjective of maximizing the efficiency can be achieved, while naturally take intoaccount the principles of social justice. Through analysis of the results of theevaluation, we can see the ramp control based on the superiority of chaos can not onlyensure the overall traffic efficiency, effectively improve road capacity, reducecongestion, but also to ensure fairness among different users.