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1. An Universally Maximal Flow Model for Evacuation Route Planning | |||
GAO Mingxia | |||
Transportation Engineering 26 October 2012 | |||
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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 |
2. 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 | |||
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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 |
3. 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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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 |
4. Circular Traffic Organization | |||
LUO Xingchun,LI Yan | |||
Transportation Engineering 12 November 2011 | |||
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Abstract:Circular traffic organization is to choose appropriate arterial road or secondary trunk road as circuit in proper urban region, to set special in- and out-circuit right turn lane in intersection and to set special U-turn lane in appropriate circuit position. With proper weaving, vehicle stream can turn left or "dash out circuit" to go straight on through straight or right-turn after U-turned in U-turn lane. All the intersections are not permitted to turn left and dash out circuit to go straight on in order to assure traffic efficiency of straight in circuit and form self-organization circular traffic. Thus the traffic conflict point in intersection can be eliminated, time loss which caused by setting too many traffic signal lamps in intersection can be avoided, as well as traffic jam which caused by overconcentration of traffic converging, weaving and diverging regions in traditional roundabout traffic organization, and traffic bottleneck can be let up. Thereby traffic efficiency of area traffic can be improved greatly, and a safe, unblocked and effective traffic environment is available. | |||
TO cite this article:LUO Xingchun,LI Yan. Circular Traffic Organization[OL].[12 November 2011] http://en.paper.edu.cn/en_releasepaper/content/4449247 |
5. A web-based interview platform with geospatially prompted recalls for GPS household travel survey | |||
CHEN Wen,JI Minhe | |||
Transportation Engineering 30 March 2011 | |||
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Abstract:Low data quality and heavy survey burden are standing issues in questionnaire-based household travel surveys (HTS). The proliferation of GPS and Internet-based geospatial technology provides great potential for innovation. This paper presents a web-based, geospatially prompted recall interview platform for GPS-based household travel survey. It made use of geospatial orientation and objects from Google Map as visual and semantic cues to prompt respondents' recall of travel experiences. The realized system functionality includes end-user self-administrated passive GPS survey data uploading, web server database management for GPS and trip data, automated GPS data noise removal, trip/stop candidate extraction, and GPS trajectory simplification, as well as annotated trip visualization and playback animation. Several essential tools for trip editing and attribute updates are provided in a logical and user-friendly manner. This approach was tested in Shanghai, a metropolitan setting of dense population, heavy inner-city traffic, and cement forests. The preliminary results indicated that the Internet map-based interface offered a great deal of heuristics to improve trip recall accuracy, while the backstage data mining algorithms was able to tolerate greater errors in trip recall and attribution from the user. The combined effects of rich geospatial and semantic hints, short system response time, and friendly user interface may help to significantly reduce the physiological and mental burdens on survey respondents, hence leading to a higher rate of participation. | |||
TO cite this article:CHEN Wen,JI Minhe. A web-based interview platform with geospatially prompted recalls for GPS household travel survey[OL].[30 March 2011] http://en.paper.edu.cn/en_releasepaper/content/4419328 |
6. Model of the Parking Demand Prediction for Urban Complex | |||
Wu Zhizhou,Fan Yujie | |||
Transportation Engineering 04 March 2011 | |||
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Abstract:Urban Complex is a new concept of the combination of multiple-function architecture subsystems, including hotel, office, residence and entertainment, etc. Its parking requirements and characteristics are quite different from general city buildings'. In this paper, the traveler behavior characteristics in Urban Complex are analyzed first, and the correlation coefficients matrix among different functional subsystems is built. Then a modified parking generation rate model of the Urban Complex is developed. This model can eliminate the parking repetition in traditional parking generation rate model. The validation result shows that the model has higher accuracy in parking demand prediction. | |||
TO cite this article:Wu Zhizhou,Fan Yujie. Model of the Parking Demand Prediction for Urban Complex[OL].[ 4 March 2011] http://en.paper.edu.cn/en_releasepaper/content/4412172 |
7. Road structures, traffic demand and flow characteristics at inhomogeneous urban freeway sections | |||
HE Shuyan,GUAN Wei | |||
Transportation Engineering 25 February 2011 | |||
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Abstract:IRoad inhomogeneities such as on- and off-ramps, lane increasing and decreasing are potential bottlenecks. Capacity of urban freeway during peak period is affected by these complex road structure and high traffic demand. Since the dense inhomogeneities are close to each other, investigation aiming at describing integrated effects of road inhomogeneities is needed. In this paper, based on real traffic data of Beijing urban freeway, relation between traffic demand, road structure and lane-specified traffic characteristics are investigated. It is turned out that the main reason for capacity decrease at peak period is fluctuations induced by competition between main road and ramp. However, on-ramp and off-ramp are different in the way for triggering a capacity drop. Based on empirical investigation, mathematical descriptions for congestion evolution process are developed for further modelling. | |||
TO cite this article:HE Shuyan,GUAN Wei. Road structures, traffic demand and flow characteristics at inhomogeneous urban freeway sections[OL].[25 February 2011] http://en.paper.edu.cn/en_releasepaper/content/4412503 |
8. Review on Designing pavement for steel bridge | |||
CHEN Xianhua | |||
Transportation Engineering 27 December 2010 | |||
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Abstract:This paper has presented a brief review of principles for the design of pavement for orthotropic steel plate decks. Issues on the local displacement and negative bending behaviour under truck loading, main distresses in asphalt surfacing and their mechanism, and basic requirements are included. A fatigue based mechanical-experimental design procedure was proposed for the designing of deck pavement. It is pointed out that new models to accurately describe the composite interaction between asphalt layer and steel deck plates, interaction between asphalt layer's fatigue and bonding membrane damage and their influences, and a more precise performance based design methods are still need to be further investigated. | |||
TO cite this article:CHEN Xianhua. Review on Designing pavement for steel bridge[OL].[27 December 2010] http://en.paper.edu.cn/en_releasepaper/content/4401550 |
9. Study on the Three-dimensional Loading Optimization Problem of Freight Transshipment | |||
Bu Lei,Yin Chuanzhong | |||
Transportation Engineering 15 December 2010 | |||
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Abstract:In this paper, the three-dimensional bin packing optimization for freight transshipment in multimodal transportation is considered. The problem is to load a set of different size regular goods with given quantities in containers at the container transfer station, and the objective is to minimize the number of containers needed. The authors set up the mathematic model considering the general characteristic of container multi-modal transportation, such as the constraints of load capacity, loading mass, direction and sequence of placement, and loading stability. At the same time, the authors also introduce the parameter of freight transportation time window, which is decided by freight train formation plan and transit deadline of goods. The authors put out an immune algorithm for the problem to enforce constringency. In this algorithm, effective antibody coding is designed in view of constraints of load capacity, loading mass, direction and sequence of placement, and affinity function is designed in view of constraints of loading stability and freight transportation time window. Computer simulation shows the efficiency and validity of the model and algorithm. | |||
TO cite this article:Bu Lei,Yin Chuanzhong. Study on the Three-dimensional Loading Optimization Problem of Freight Transshipment[OL].[15 December 2010] http://en.paper.edu.cn/en_releasepaper/content/4397536 |
10. Two-Way Bandwidth Maximization Model with Proration Impact Factor for Unbalanced Bandwidth Demands | |||
LU Kai,XU Jianmin,LI Lin | |||
Transportation Engineering 28 September 2010 | |||
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Abstract:Progression bandwidth maximization is one of the most important signal coordination strategies for urban arterial signal control. MAXBAND and MULTIBAND have implemented a weighting factor that is capable to adjust the bandwidth according to unbalance bandwidth demands in a two-way bandwidth maximization problem. However, the maximum bandwidth solution may not be achieved with certain values of weighting factors. Therefore, it might require users to have a good idea about what weighting factor to use in order not to compromise the total bandwidth. In this paper, we proposed a new two-way bandwidth maximization model that not only maximizes the total bandwidth but also introduces a bandwidth proration impact factor. This impact factor allows the user to control the importance of satisfying the bandwidth demand ratio. Numerical examples have demonstrated that the new model has the following advantages: (a) when two-way progressions are difficult to achieve, the model first guarantees maximum total bandwidths and then automatically prorates the bandwidth fully to the direction with higher traffic demand; (b) when two-way progressions could be achieved, the model not only guarantees maximum total bandwidth but automatically prorates the bandwidth in a ratio as close as possible to the ratio of bandwidth demands. | |||
TO cite this article:LU Kai,XU Jianmin,LI Lin. Two-Way Bandwidth Maximization Model with Proration Impact Factor for Unbalanced Bandwidth Demands[OL].[28 September 2010] http://en.paper.edu.cn/en_releasepaper/content/4386983 |
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