Authentication email has already been sent, please check your email box: and activate it as soon as possible.
You can login to My Profile and manage your email alerts.
If you haven’t received the email, please:
|
|
There are 55 papers published in subject: since this site started. |
Select Subject |
Select/Unselect all | For Selected Papers |
Saved Papers
Please enter a name for this paper to be shown in your personalized Saved Papers list
|
1. Methodology to Identify the Recommended Values of Advisory Exit Speed Limit on Freeway Exit Ramp in China | |||
HU Sitao,XIANG Qiaojun | |||
Transportation Engineering 12 October 2013 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Many crashes occurred around freeway exit ramp areas due to speeding and speed variance,. Traditionally, a posted ramp speed limit will be installed around physical gore area to manage speed around the area. Unfortunately, the field study showed that speeding and speed variance haven't been improved too much after introduction of posted ramp speed limit. An additional speed limit on deceleration lane may be needed to accommodate the speed changes ahead of physical gore, which could be functioned by Advisory Exit Speed Limit (AESL). However, no systematic research on the application of AESL has been reported yet. Thus, the primary objective of the paper is to develop a general methodology to identify and to validate the recommended values of AESL. To achieve this goal,seven Sites with same exit ramp configuration in China were selected and two Scenarios (with AESL/ without AESL) were investigated to quantify the effectiveness. Based on the recommended values of AESL,an experiment application of AESL was conducted and t-test was introduced to verify the differences in speed before and after experimental application of AESL. Results showed that with AESL, the mean speed and the 85th percentile speed reduced significantly. The paper can provide researchers, managers and engineers with reasonable foundations, when determining the recommended values of AESL. The proposed methodology will be especially helpful in China and other developing countries for similar exit ramps | |||
TO cite this article:HU Sitao,XIANG Qiaojun. Methodology to Identify the Recommended Values of Advisory Exit Speed Limit on Freeway Exit Ramp in China[OL].[12 October 2013] http://en.paper.edu.cn/en_releasepaper/content/4563416 |
2. LARGE TRACK IRREGULARITY DIVIATIONS OF TRACK QUALITY INDEX | |||
Wang Jiannan,Wang Xiaoliang | |||
Transportation Engineering 20 March 2013 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:In this paper, track quality index(TQI), as a comprehensive evaluation of track status, provides an important basis for the conservation and maintenance of railway tracks. Currently implemented TQI is obtained by the dispersion degree of seven main track state parameters. When most track state parameters are excellent, while individual larger deviations appears, track quality index can not accurately reflect the security risks of the track. A set of new correction factors are introduced into the track quality index algorithm. In the situations mentioned, corrected TQI can detects the quality of the track defects. At the same time, the results in other cases are similar to the original algorithm, which means the original classification standard still works. | |||
TO cite this article:Wang Jiannan,Wang Xiaoliang. LARGE TRACK IRREGULARITY DIVIATIONS OF TRACK QUALITY INDEX[OL].[20 March 2013] http://en.paper.edu.cn/en_releasepaper/content/4531513 |
3. Networking optimization for Holo-distributed automotive body electrical system | |||
Zhang Xinfeng,Shen Yong | |||
Transportation Engineering 12 March 2013 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:In this paper, a holo-distributed automotive electrical system architecture with the network optimization method is proposed. The system features that all electrical devices are the network nodes and connected with two separate networks, namely the digital signal network and the power supply network. The digital signal network features a set of hierarchy local subnets. An ordered-specimen cluster analysis based optimization method is proposed for the widely scattered and utterly disordered body electrical devices connection with the simplest harness. Through electrical device reduced-dimension ordering, the optimization problem is converted to an ordered-specimen with limited-group-capacity partition problem with the restrain of network schedulable condition. Problem's solver algorithm is also proposed based on global search in shrank space. Finally, the method is used during the development of distributed body electrical system on prototype urban bus, and proved to be feasible. | |||
TO cite this article:Zhang Xinfeng,Shen Yong. Networking optimization for Holo-distributed automotive body electrical system[J]. |
4. Research on Temperature Effect on the Natural Frequencies of Continuous Beams Based on Stochastic Subspace Identification | |||
Cheng Yongchun,Shi Yuping,Tan Guojin | |||
Transportation Engineering 21 January 2013 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract: Natural frequencies are of great value to bridge structural design, health monitoring and detection. Related research data show that the ambient temperature can affect the natural frequencies of the continuous box-girder bridges. In order to research the effect of temperature on the bridge structure and conclude the influence law, theoretical analysis of temperature effect on the natural frequencies of the continuous box girder bridges is conducted based on the stochastic subspace identification. First, the finite element model of the bridge is built to conduct thermal-structural coupling analysis. Then regard the analysis results as the original state, and exert white noise excitation on the structure to obtain the dynamic response of the structure. And then analyze the dynamic response based on the stochastic subspace identification and calculate the natural frequencies of the bridges under the temperature effect. At last, based on the practical project of one 3-span continuous box-girder bridge, the validity and the reliability of this method is verified. | |||
TO cite this article:Cheng Yongchun,Shi Yuping,Tan Guojin. Research on Temperature Effect on the Natural Frequencies of Continuous Beams Based on Stochastic Subspace Identification[OL].[21 January 2013] http://en.paper.edu.cn/en_releasepaper/content/4515647 |
5. Car Capacity near a Curbside Stop with Mixed Traffic Flow | |||
YANG Xiaobao,HUAN Mei | |||
Transportation Engineering 11 January 2013 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:This paper proposes a car capacity model for mixed traffic flow near the curbside stop. When a bus dwells at the stop in the non-motor lane, bicycles will change to the motor lane. Thus, the presence of a stopped bus creates a temporary car-bicycle conflict, reducing the road capacity. In addition, the car-bus conflict takes place when a bus departs from the stop to the motor lane. The conflict between different streams can be represented by an M/G/1 queue. Car capacity near the stop can be derived by iteratively computing the service time of the M/G/1 queue. The analysis shows that both bus stream and bicycle stream have significant effects on car capacity. | |||
TO cite this article:YANG Xiaobao,HUAN Mei. Car Capacity near a Curbside Stop with Mixed Traffic Flow[OL].[11 January 2013] http://en.paper.edu.cn/en_releasepaper/content/4511377 |
6. 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 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 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 |
7. Modeling stochastic multiple equilibrium behaviors on urban traffic networks | |||
ZHAO Hui,GAO Ziyou | |||
Transportation Engineering 06 December 2012 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 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 |
8. Reliability of estimating equilibrium speed-spacing relation with trajectory data | |||
WANG Hao,YANG Wanbo | |||
Transportation Engineering 23 November 2012 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 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 |
9. Tradable credits for congestion management with mixed equilibrium behaviors | |||
ZHAO Hui,ZHANG Cuiping,SUN Huijun,GAO Ziyou | |||
Transportation Engineering 22 November 2012 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 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 |
10. 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 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 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 |
Select/Unselect all | For Selected Papers |
Saved Papers
Please enter a name for this paper to be shown in your personalized Saved Papers list
|
|
About Sciencepaper Online | Privacy Policy | Terms & Conditions | Contact Us
© 2003-2012 Sciencepaper Online. unless otherwise stated