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| There are 50 papers published in subject: since this site started. | |||
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| 1. Car Delay Time near a Curbside Stop under Mixed Traffic Condition | |||
| YANG Xiaobao,HUAN Mei,FAN Aihua,DONG Ling,LI Ming | |||
Transportation Engineering 01 January 2013
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| Show/Hide Abstract | Cite this paper︱Full-text: PDF (4K B) | |||
| Abstract:This paper proposes a delay model to cars under mixed traffic flow near the curbside stop based on queuing theory. Bus stream system is described by an M/M/k queue and the service counter is the bus stop. The conflict between different streams at the stop is developed by the advanced Markovian model with unequal arrival rates and unequal service rates for customers of two major types. The delay to cars near the stop under mixed traffic flow can be derived by the queuing models. The average car delay is estimated as the sum of the average delay at the conflict points between different streams, and the delay resulting from following the slower bicycles that merged into the motorized lane. Car delay model is the function of three types of traffic streams with buses, cars and bicycles. The proposed model may be applicable to design and operational analysis of bus stops in other Asian developing countries. | |||
| TO cite this article:YANG Xiaobao,HUAN Mei,FAN Aihua, et al. Car Delay Time near a Curbside Stop under Mixed Traffic Condition[OL].[ 1 January 2013] http://en.paper.edu.cn/en_releasepaper/content/4511337 | |||
| 2. Modeling stochastic multiple equilibrium behaviors on urban traffic networks | |||
| ZHAO Hui,GAO Ziyou | |||
Transportation Engineering 06 December 2012
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| Show/Hide Abstract | Cite this paper︱Full-text: PDF (4K B) | |||
| Abstract:In this paper, multiple traffic equilibrium with both competition and cooperation behaviors in stochastic environments is concentrated. Three different types of players, including Stochastic User Equilibrium (SUE) player, Stochastic System Optimum (SSO) player and Stochastic Cournot-Nash (SCN) player are simultaneously considered when the players are presumed to make routing decision with other players' perceptions of travel times. By formulating the stochastic multiple equilibrium as Variational Inequalities (VI), the multiple routing behaviors on urban networks is analyzed. Diagonalization technique is adopted to solve the VI problem arisen form the multiple traffic equilibrium model. And numerical examples are included to demonstrate the proposed models. | |||
| TO cite this article:ZHAO Hui,GAO Ziyou. Modeling stochastic multiple equilibrium behaviors on urban traffic networks[OL].[ 6 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4501284 | |||
| 3. Reliability of estimating equilibrium speed-spacing relation with trajectory data | |||
| WANG Hao,YANG Wanbo | |||
Transportation Engineering 23 November 2012
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| Show/Hide Abstract | Cite this paper︱Full-text: PDF (4K B) | |||
| Abstract:This paper studies the reliability of estimating the equilibrium speed-spacing relationship from the dynamic trajectory data. Empirical trajectories with long durations are used to extract the near equilibrium data and the dynamic trajectory data. Two car-following models, the Optimal Velocity Model (OVM) and the Intelligent Driver Model (IDM) are applied for the model calibration from the individual trajectory. A root mean square error based indicator is introduced to measure the performance of the model estimation for the equilibrium speed-spacing relationship. Seven factors that influence the model estimation are presented, and the correlations between factors and estimation performance are analyzed based on the ordered logistic regression. It is found that the OVM performs the best in estimating the equilibrium speed-spacing relationship. The results of ordered logistic regression indicate that long trajectory duration and multiple dynamic types are beneficial to the reliability of the estimation for the equilibrium speed-spacing relationship. | |||
| TO cite this article:WANG Hao,YANG Wanbo. Reliability of estimating equilibrium speed-spacing relation with trajectory data[OL].[23 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4496494 | |||
| 4. Tradable credits for congestion management with mixed equilibrium behaviors | |||
| ZHAO Hui,ZHANG Cuiping,SUN Huijun,GAO Ziyou | |||
Transportation Engineering 22 November 2012
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| Show/Hide Abstract | Cite this paper︱Full-text: PDF (4K B) | |||
| Abstract:In this paper, we investigate the tradable credit scheme for a transportation system with multiple equilibrium behaviors in congestion management. The target system contains user equilibrium (UE), Cournot-Nash equilibrium (CNE) and market equilibrium (ME) simultaneously. The UE-CNE and ME conditions can be formulated into an equivalent Variational Inequality Problem (VIP) and the solution's existence and uniqueness properties are discussed. Furthermore, the uniqueness of credit price is also presented. By transferring the tradable credit design problem into an equivalent quadratic programming problem, we design an appropriate tradable credit scheme to decentralize system optimal network flow patterns. Applications of the proposed model are illustrated with numerical results. | |||
| TO cite this article:ZHAO Hui,ZHANG Cuiping,SUN Huijun, et al. Tradable credits for congestion management with mixed equilibrium behaviors[OL].[22 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4495617 | |||
| 5. Mortar fatigue model for meso-mechanical mixture design of ravelling resistant porous asphalt concrete | |||
| L.T. Mo,M. Huurman,S.P. Wu,A.A.A. Molenaar | |||
| Transportation Engineering 30 October 2012
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| Show/Hide Abstract | Cite this paper︱Full-text: PDF (4K B) | |||
| Abstract:This paper presents the development of a practical mortar fatigue model on the basis of the dissipated energy concept. A specially designed test setup was developed for characterization of mortar fatigue at meso-scale by means of Dynamic Shear Rheometer (DSR). Test results showed that mortar fatigue models based on the dissipated energy concept can be developed for the purpose of life predictions under complex loading conditions. The dissipated energy per cycle in the initial phase of fatigue tests is a much more practical indicator for fatigue life determination purposes than the total energy dissipated during a fatigue test. Since a mortar fatigue model based on the initial dissipated energy per cycle was adopted, effects of complex stress and strain signals can be taken into account. | |||
| TO cite this article:L.T. Mo,M. Huurman,S.P. Wu, et al. Mortar fatigue model for meso-mechanical mixture design of ravelling resistant porous asphalt concrete[OL].[30 October 2012] http://en.paper.edu.cn/en_releasepaper/content/4493559 | |||
| 6. An Universally Maximal Flow Model for Evacuation Route Planning | |||
| GAO Mingxia | |||
| Transportation Engineering 26 October 2012 | |||
| Show/Hide Abstract | Cite this paper︱Full-text: PDF (4K B) | |||
| Abstract:Evacuation plays an important role in emergency management, and efficient tools are needed to identify routes and departure schedules for evacuation vehicles to guarantee safety and efficiency. Most research works on such problem do not explicitly consider delay and capacity at intersections. However, in congested street networks, turning movement delays and capacity at intersections may be significant, and ignoring them may lead to the calculation of suboptimal or illogical routing plans. With turning delay and capacity at intersections as weights of node, the evacuation road network is expressed as a network with directional node-weight and the problem of finding optimal evacuation routing plans is described as a special universally maximal flow problem. A algorithm is presented to find the optimal route and departure schedule by maximizing the flow arriving at sink by all time t in study period (namely the universally maximal flow over time), which is done by modifying the classical one that do not deal with weights at nodes. A numerical example is given. | |||
| TO cite this article:GAO Mingxia. An Universally Maximal Flow Model for Evacuation Route Planning[OL].[26 October 2012] http://en.paper.edu.cn/en_releasepaper/content/4493176 | |||
| 7. Pavement structural optimization based on multiaxial Mohr-Coulomb yield criterion and its case study on Chongqing test track | |||
| Liu Wanqiu,Zhao yanqing,Wang Zheren,Zhou Zhi | |||
| Transportation Engineering 13 July 2012 | |||
| Show/Hide Abstract | Cite this paper︱Full-text: PDF (4K B) | |||
| Abstract:The mechanistic analysis of pavement structural performance can be a cost-effective approach for pavement structure design and damage prediction. Its practical application is currently restricted by the low accuracy of the numerical simulations and lack of precise verifying tools. This paper introduces a multiaxial yield criterion for asphalt pavement materials. It is closely associated with Mohr-Coulomb theory, which is proved to fit the actual pavement material triaxial strength tests well. It also considers both the strength difference between tensile and compressive loading and the difference between σ2 and σ3 in the actual stress field of pavement structure. An optimization program has been developed based on the proposed yield criterion using a parallel evolutionary algorithm. The program can help with the structure formation design (especially for rutting resistance) with high efficiency and study the effect of structural coordination on stress distribution. The proposed yield criterion has been verified through the successful application in explaining both the field test results of a test track in Chongqing, China and the case studies from engineering practices, which cannot be achieved using traditional methods. | |||
| TO cite this article:Liu Wanqiu,Zhao yanqing,Wang Zheren, et al. Pavement structural optimization based on multiaxial Mohr-Coulomb yield criterion and its case study on Chongqing test track[OL].[13 July 2012] http://en.paper.edu.cn/en_releasepaper/content/4484587 | |||
| 8. Integrated Yaw and Roll Stability Control for Sport Utility Vehicles in Highway Turning Scenario | |||
| GE Jin,GAO Feng,XU Guoyan,SONG Xiaolin | |||
| Transportation Engineering 14 May 2012
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| Show/Hide Abstract | Cite this paper︱Full-text: PDF (4K B) | |||
| Abstract:This paper designs an integrated control strategy of vehicle yaw and rollover stability to enhance the active safety of highway vehicles in turning scenario. A rollover predictor is built based on Time-To-Rollover index. Modified Linear Quadratic Regulation is used in roll stability control, and Partial-Integral design is used in yaw stability control. With Carsim and MATLAB, simulations of fishhook maneuver and double lane-change test are conducted to evaluate the effectiveness of the control configuration and to validate the control method. The result shows that this controller performs well in maintaining vehicle roll and yaw stability. This study provides a theoretical basis towards a unified chassis control of coupled roll and yaw stability. | |||
| TO cite this article:GE Jin,GAO Feng,XU Guoyan, et al. Integrated Yaw and Roll Stability Control for Sport Utility Vehicles in Highway Turning Scenario[OL].[14 May 2012] http://en.paper.edu.cn/en_releasepaper/content/4478467 | |||
| 9. Circular Traffic Organization | |
| LUO Xingchun,LI Yan | |
| Transportation Engineering 12 November 2011 | |
| Show/Hide Abstract | Cite this paper︱Full-text: PDF (4K B) | |