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1. Optimization Design of Hydraulically Interconnected Suspension Based on Orthogonal Experiment | |||
Zhou Bing,Long Lefei,Wu Xiaojian | |||
Transportation Engineering 06 March 2018 | |||
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Abstract:In this paper, a 4-DOF roll-plane half-car model of hydraulically interconnected suspension (HIS) system is established, and the dynamic equations in frequency domain for the mechanical-hydraulic coupled system are derived. Then, the sensitivities of the vertical and roll modal responses to the hydraulic parameters are analyzed by employing the Sobol global analysis approach. The results indicate that the parameters of accumulators and damping valves have a significant effect on the vertical and roll modal vibrations. On this basis, the high sensitive hydraulic parameters are selected as optimized variables, and an optimization objective function is designed by mixing the vertical acceleration power spectral density and the roll angular acceleration power spectral density via an S-function. Thereafter the HIS system is optimized using the orthogonal optimization method. Finally, simulations at the speed of 10m/s, 20m/s and 30m/s indicate the optimized HIS system synthetically improves the vehicle ride comfort and roll stability. | |||
TO cite this article:Zhou Bing,Long Lefei,Wu Xiaojian. Optimization Design of Hydraulically Interconnected Suspension Based on Orthogonal Experiment[OL].[ 6 March 2018] http://en.paper.edu.cn/en_releasepaper/content/4743695 |
2. Safety Evaluation of Highway Alignment Based on Fault Tree Analysis and Energy Method | |||
CHEN Yi-kai,WANG Kai,SHI Qin,SHI Ting,HUANG Sen | |||
Transportation Engineering 18 April 2017 | |||
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Abstract:In this pape, in order to enhance the accuracy of highway alignment safety evaluation, the crash comprehensive probability was formulated based on fault tree theory, taking sideslip/steering instability, rollover and rear-end crash into account.The driver-vehicle-road multi-body dynamics model was developed based on the three-dimensional alignments of Ning-Luo expressway using Carsim. Each section of the average crash probability were obtained after simulation and calculation, and compared with various sections of the average number of accidents.Results reveal that that at the confidence level of 0.01, when dividing the expressway into sections with lengths of 5km and 10km, respectively, the Spearman correlation coefficients between average crash probability and average number of accidents are 0.636 and 0.460. While the Spearman correlation coefficients using traditional fault tree are only 0.531 and 0.378. | |||
TO cite this article:CHEN Yi-kai,WANG Kai,SHI Qin, et al. Safety Evaluation of Highway Alignment Based on Fault Tree Analysis and Energy Method[OL].[18 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4725697 |
3. 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 | |||
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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 |
4. Networking optimization for Holo-distributed automotive body electrical system | |||
Zhang Xinfeng,Shen Yong | |||
Transportation Engineering 12 March 2013 | |||
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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]. |
5. 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 |
6. 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 |
7. MODELING DRIVER CAR-FOLLOWING BASED ON THE QUEUING NETWORK COGNITIVE ARCHITECTURE | |||
Bi Luzheng ,Liu Yili | |||
Transportation Engineering 18 June 2009 | |||
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Abstract:Driver car-following control is a quite common activity in driving. Modeling driver car-following in a cognitive architecture can contribute to driving-related human factors research. Queuing Network-Model Human Processor (QN-MHP) is a computational cognitive architecture developed to represent human information processing as a queuing network on the basis of neuroscience and psychological findings. In this paper, using the QN-MHP cognitive architecture, we propose a driver car-following model to represent the concurrent perceptual, cognitive, and motor activities involved in the task of driver car-following. The simulation results show that this model can perform the control process of car-following well, and the results are consistent with those of driver control. | |||
TO cite this article:Bi Luzheng ,Liu Yili . MODELING DRIVER CAR-FOLLOWING BASED ON THE QUEUING NETWORK COGNITIVE ARCHITECTURE[OL].[18 June 2009] http://en.paper.edu.cn/en_releasepaper/content/33237 |
8. Constraint Handling Methods for Management Systems of Pavement Maintenance and Rehabilitation | |||
He Zhi-qiang,Sun Xiao-ling | |||
Transportation Engineering 02 October 2008 | |||
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Abstract:The rate of good level highway in the network is the most important evaluation criteria on the pavement maintenance and rehabilitation quality in China. In this paper, we propose two discrete optimization models in different rate of good level highway constraint handling Methods. These optimal decision models are formulated as linear integer programming problems with binary decision variables. The objective function and constraints are based on the pavement performance and prediction model using the Pavement Condition Index (PCI). Numerical experiments are carried out with the data from a highway system in Sichuan Province. | |||
TO cite this article:He Zhi-qiang,Sun Xiao-ling. Constraint Handling Methods for Management Systems of Pavement Maintenance and Rehabilitation[OL].[ 2 October 2008] http://en.paper.edu.cn/en_releasepaper/content/24512 |
9. The Impact of ETC System on Safety Performance of Toll Collection Plazas | |||
Jian Lu,Fan Ye,Jiping Ding,Qiaojun Xiang | |||
Transportation Engineering 29 November 2005 | |||
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Abstract:Little research has been done to evaluate the impacts of electronic toll collection (ETC) system on the safety at toll plazas. Past research has indicated that ETC system does contribute to traffic accidents at toll collection plazas. However, there are still no definite conclusions on safety impacts. The main object of this paper is to evaluate the impacts of ETC on safety performance of toll collections as a part of a research project. In the paper, the safety conditions at a toll plaza and the contributing factors of ETC to safety are discussed. Based on traffic crash data collected, it was indicated that ETC may result in the increase of crash number and more severe crashes could happen due to the high passing speed at ETC gates. | |||
TO cite this article:Jian Lu,Fan Ye,Jiping Ding, et al. The Impact of ETC System on Safety Performance of Toll Collection Plazas[OL].[29 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3843 |
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