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A new cellular automaton for signal controlled traffic flow based on driving behaviors

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Chinese Physics B 2015年第3期24卷 463-473页

作者：王扬陈艳艳 Beijing Key Laboratory of Traffic Engineering College of Metropolitan TransportationBeijing University of Technology

The complexity of signal controlled traffic largely stems from the various driving behaviors developed in response to the traffic signal. However, the existing models take a few driving behaviors into account and consequently the traffic dynamics has not been completely explored. Therefore, a new cellular automaton model, which incorporates the driving behaviors typically manifesting during the different stages when the vehicles are moving toward a traffic light, is proposed in this paper. Numerical simulations have demonstrated that the proposed model can produce the spontaneous traffic breakdown and the dissolution of the over-saturated traffic phenomena. Furthermore, the simulation results indicate that the slow-to-start behavior and the inch-forward behavior can foster the traffic breakdown. Particularly, it has been discovered that the over-saturated traffic can be revised to be an under-saturated state when the slow-down behavior is activated after the spontaneous breakdown. Finally, the contributions of the driving behaviors on the traffic breakdown have been examined.

关键词： cellular automata signalized traffic systems spontaneous traffic breakdown driving behaviors

Tri-level programming model for combined urban traffic signal control and traffic flow guidance

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Journal of Central South University 2016年第9期23卷 2443-2452页

作者： SUN Zhi-yuan LU Hua-pu QU Wen-cong Institute of transportation Engineering Tsinghua University Beijing 100084 China college of metropolitan transportation Beijing University of Technology Beijing 100124 China

In order to balance the temporal-spatial distribution of urban traffic flow, a model is established for combined urban traffic signal control and traffic flow guidance. With consideration of the wide use of fixed signal control at intersections, traffic assignment under traffic flow guidance, and dynamic characteristics of urban traffic management, a tri-level programming model is presented. To reflect the impact of intersection delay on traffic assignment, the lower level model is set as a modified user equilibrium model. The middle level model, which contains several definitional constraints for different phase modes, is built for the traffic signal control optimization. To solve the problem of tide lane management, the upper level model is built up based on nonlinear 0-1 integer programming. A heuristic iterative optimization algorithm(HIOA) is set up to solve the tri-level programming model. The lower level model is solved by method of successive averages(MSA), the middle level model is solved by non-dominated sorting genetic algorithm II(NSGA II), and the upper level model is solved by genetic algorithm(GA). A case study is raised to show the efficiency and applicability of the proposed modelling and computing method.

关键词： traffic engineering traffic signal control traffic flow guidance tri-level programming model

CONSENSUS ANALYSIS AND DESIGN OF LINEAR INTERCONNECTED MULTI-AGENT SYSTEMS

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Acta Mathematica Scientia 2015年第6期35卷 1305-1317页

作者：陈阳舟李伟代桂平 A.Yu.ALEKSANDROV college of metropolitan transportation Beijing Laboratory For Urban Mass Transit Beijing University of Technology college of metropolitan transportation Beijing University of Technology Beijing 100124 China Department of Electromechanical Engineering Shijiazhuang Institute of Railway Technology college of metropolitan transportation Beijing University of Technology Faculty of Applied Mathematics and Control Processes St.Petersburg State University

We deal with the state consensus problem of a general Linear Interconnected Multi-Agent System （LIMAS） under a time-invariant and directed communication topology. Firstly, we propose a linear consensus protocol in a general form, which consists of state feedback of the agent itself and feedback form of the relative states between the agent and its neighbors. Secondly, a state-linear-transformation is applied to equivalently transform the state consensus problem into a partial stability problem. Based on the partial stability theory, we derive a sufficient and necessary criterion of consensus convergence, which is expressed via the Hurwitz stability of a real matrix constructed from the parameters of the agent models and the protocols, and present an analytical formula of the consensus function. Lastly, we propose a design procedure of the gain matrices in the protocol by solving a bilinear matrix inequality.

关键词： linear interconnected multi-agent system (LIMAS) partial stability state-linear-transformation criterion of consensus convergence consensus design

A Model for Capacity Considering the Interference by Pedestrian Traffic at Signal Intersections

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Journal of Harbin Institute of Technology(New Series) 2016年第1期23卷 82-89页

作者： Yixin Chen Yulong He Xiaoduan Sun college of metropolitan transportation Beijing University of Technology

The capacity is impacted badly by pedestrians' violation behavior at signal intersections. In order to quantify the impact,the time-headway and the vehicular speed from start-up to reach the stable saturation flow with and without pedestrian traffic are used as the direct measurements. Using the statistical analysis,the timeheadway of saturation flow is mainly affected by the position of pedestrians and the degree of pedestrians 'influence is classified into four levels. Then the speed-time profile for the vehicular acceleration at each level is fitted by Curve Fitting Software. Based on the effect to the time-headway and acceleration time,the model of capacity influenced by pedestrians is established and the influence is quantified, which enriches the fundamental theory of traffic engineering. The result shows that the vehicular capacity can be decreased by 14%at the worst case( level I). The conclusions obtained in this paper are valuable for better management of the signal intersection.

关键词： urban traffic capacity impact of pedestrians significant analysis

PARTIAL STABILITY ANALYSIS OF SOME CLASSES OF NONLINEAR SYSTEMS

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Acta Mathematica Scientia 2017年第2期37卷 329-341页

作者： Alexander ALEKSANDROV Elena ALEKSANDRO VA Alexey ZHABKO 陈阳舟 Saint Petersburg State University Saint Petersburg 199034Russia Beijing Key Laboratory of transportation Engineering College of Metropolitan TransportationBeijing University of TechnologyBeijing 100124China

A nonlinear differential equation system with nonlinearities of a sector type is studied. Using the Lyapunov direct method and the comparison method, conditions are derived under which the zero solution of the system is stable with respect to all variables and asymptotically stable with respect to a part of variables. Moreover, the impact of nonstationary perturbations with zero mean values on the stability of the zero solution is investigated. In addition, the corresponding time-delay system is considered for which delay-independent partial asymptotic stability conditions are found. Three examples are presented to demonstrate effectiveness of the obtained results.

关键词： Nonlinear systems partial asymptotic stability LyaPunov function sector nonlinearities time-delay

Understanding taxi driver's cruising behavior with ZIP model

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Journal of Central South University 2014年第8期21卷 3404-3410页

作者：宗芳 college of transportation Jilin University

The taxi drivers' cruising pattern was learned using GPS trajectory data collected in Shenzhen,*** employing zero-inflated Poisson model,the impacts of land use and previous pick-up experience on cruising decision were *** cruising strategies of different types of drivers as well as the top one driver were *** results indicate that both land use and previous pick-up experience affect travel behavior with the former's influence(7.07×10-4 measured by one of the coefficients in zero-inflated Poisson model) being greater than the latter's(4.58×10-5) in general,but the comparison also varies across the types of ***,taxi drivers' day-to-day learning feature is also proved by the *** to comparison of the cruising behavior of the most efficient and inefficient driver,an efficient cruising strategy was proposed,that is,obeying the distribution of land use in choice of cruising area,while learning from pick-up experience in selection of detailed cruising *** learning taxi drivers' cruising pattern,the development of measures of regulating travel behaviors is facilitated,important factor for traffic organization and planning is identified,and an efficient cruising strategy for taxi drivers is provided.

关键词： taxi driver GPS cruise land use objective information subjective information

Effect of strain rate and water-to-cement ratio on compressive mechanical behavior of cement mortar

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Journal of Central South University 2015年第3期22卷 1087-1095页

作者：周继凯葛利梅 college of Civil and transportation Engineering Hohai University

Effects of strain rate and water-to-cement ratio on the dynamic compressive mechanical behavior of cement mortar are investigated by split Hopkinson pressure bar(SHPB) tests. 124 specimens are subjected to dynamic uniaxial compressive *** rate sensitivity of the materials is measured in terms of failure modes, stress-strain curves, compressive strength, dynamic increase factor(DIF) and critical strain at peak stress. A significant change in the stress-strain response of the materials with each order of magnitude increase in strain rate is clearly seen from test results. The slope of the stress-strain curve after peak value for low water-to-cement ratio is steeper than that of high water-to-cement ratio mortar. The compressive strength increases with increasing strain rate. With increase in strain rate, the dynamic increase factor(DIF) increases. However, this increase in DIF with increase in strain rate does not appear to be a function of the water-to-cement ratio. The critical compressive strain increases with the strain rate.

关键词： cement mortar loading rate compressive strength critical strain stress-strain behavior

Influence of adverse weather on drivers’ perceived risk during car following based on driving simulations

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Journal of Modern transportation 2019年第4期27卷 282-292页

作者： Chen Chen Xiaohua Zhao Hao Liu Guichao Ren Xiaoming Liu Operation Guarantee College of Metropolitan TransportationBeijing University of TechnologyBeijing 100124China Beijing transportation Information Beijing 100161China

Adverse weather has a considerable impact on the behavior of drivers,which puts vehicles and drivers in hazardous situations that can easily cause traffic *** research examines how drivers'perceived risk changes during car following under different adverse weather conditions by using driving simulation *** expressway road scenario was built in a driving *** types of weather conditions,including clear sky,four levels of fog,four levels of rain and two levels of snow,were ***,to simulate the carfollowing behavior,three car-following situations were designed according to the motion of the lead *** car-following indicators were extracted based on risk homeostasis ***,the entropy weight method was used to integrate the selected indicators into an index to represent the drivers'perceived *** linear regression was applied to measure the influence of adverse weather conditions on perceived risk,and the coefficients were considered as *** results demonstrate that both the weather conditions and road type have significant effects on car-following ***'perceived risk tends to increase with the worsening weather *** conditions of extremely poor visibility,such as heavy dense fog,the measured drivers'perceived risk is low due to the difficulties in vehicle operation and limited visibility.

关键词： Adverse weather Driving simulation Perceived risk Entropy weight method Multiple linear regression

Traffic Control Strategy for a Surface Street on an Expressway-Arterial Corridor

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Tsinghua Science and Technology 2009年第6期14卷 776-781页

作者：金盛王殿海王立明 transportation college Jilin University

Off-ramp area congestion and off-ramp queue spill over are wide-spread reasons for expressway traffic jams in China. A control strategy was developed to reduce the number of collisions between expressway and surface street vehicles and to reduce spill over by controlling the surface street vehicles to improve the traffic conditions near expressway off-ramps. This control algorithm monitors the traffic conditions at the off-ramp using occupancy rates and a performance index for the surface street vehicles, and then optimizes the control signal split and cycle length for the surface street vehicles assuming that the off-ramp queue is shorter than the minimum allowable length. Simulations indicate improvements in the traffic flow with the average vehicle travel time nearly 10% less and the off-ramp queue reduced significantly.

关键词： off-ramp spill over surface street metering simulation