Traffic Management Research Institute

Wuxi, China

Traffic Management Research Institute

Wuxi, China

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Chen Y.-K.,Hefei University of Technology | Chen Y.-K.,Traffic Management Research Institute | He J.,Nanjing Southeast University | King M.,Queensland University of Technology | And 2 more authors.
Journal of Central South University | Year: 2013

Two simple and effective control strategies for a multi-axle heavy truck, modified skyhook damping (MSD) control and proportional-integration-derivative (PID) control, were implemented into functional virtual prototype (FVP) model and compared in terms of road friendliness and ride comfort. A four-axle heavy truck-road coupling system model was established using FVP technology and validated through a ride comfort test. Then appropriate passive air suspensions were chosen to replace the rear tandem suspensions of the original truck model for preliminary optimization. The mechanical properties and time lag of dampers were taken into account in simulations of MSD and PID semi-active dampers implemented using MATLAB/Simulink. Through co-simulations with Adams and MATLAB, the effects of semi-active MSD and PID control were analyzed and compared, and control parameters which afforded the best comprehensive performance for each control strategy were chosen. Simulation results indicate that compared with the passive air suspension truck, semi-active MSD control improves both ride comfort and road-friendliness markedly, with optimization ratios of RMS vertical acceleration and RMS tyre force ranging from 10.1% to 44.8%. However, semi-active PID control only reduces vertical vibration of the driver's seat by 11.1%, 11.1% and 10.9% on A, B and C level roads respectively. Both strategies are robust to the variation of road level. © 2013 Central South University Press and Springer-Verlag Berlin Heidelberg.


Chang Y.,Traffic Management Research Institute | Dai L.-L.,Transportation Institute | Ma Z.-Y.,Traffic Management Research Institute
Applied Mechanics and Materials | Year: 2013

The quantity and damage degree caused by the traffic accidents on trunk highways always take the big part in the highway traffic accidents. Now, there are no more and complete evaluation methods for the trunk highway traffic safety. What's more, the index system is not perfect. Based on the characters of traffic safety on trunk highways and feasible factors of information collection, this article confirms 3-level evaluation index system for 20 evaluation indexes and the evaluation methods for trunk highway traffic safety based on AHP. Taking Xiake Blvd of Jiangyin City as example, this article analyzes and proves the efficiency and feasibility of these methods. The evaluation results can provide the basis for the improvement of highway traffic safety. © (2013) Trans Tech Publications, Switzerland.


Guo H.,Iowa State University | Vaswani N.,Iowa State University | Qiu C.,Traffic Management Research Institute
2014 IEEE Global Conference on Signal and Information Processing, GlobalSIP 2014 | Year: 2014

In this work, we experimentally evaluate and verify model assumptions for our recently proposed algorithm (practical ReProCS) for recovering a time sequence of sparse vectors St and a time sequence of dense vectors Lt from their sum, Mt := St + Lt, when Lt lies in a slowly changing low-dimensional subspace. A key application where this problem occurs is in video layering where the goal is to separate a video sequence into a slowly changing background sequence and a sparse foreground sequence that consists of one or more moving regions/objects. Practical-ReProCS is the practical analog of its theoretical counterpart that was studied in our recent work. © 2014 IEEE.


Zhan J.,Iowa State University | Vaswani N.,Iowa State University | Qiu C.,Traffic Management Research Institute
IEEE International Symposium on Information Theory - Proceedings | Year: 2014

Online or recursive robust PCA can be posed as a problem of recovering a sparse vector, St, and a dense vector, Lt, which lies in a slowly changing low-dimensional subspace, from Mt S t+Lt on-the-fly as new data comes in. For initialization, it is assumed that an accurate knowledge of the subspace in which L0 lies is available. In recent works, Qiu et al proposed and analyzed a novel solution to this problem called recursive projected compressed sensing or ReProCS. In this work, we relax one limiting assumption of Qiu et al's result. Their work required that the Lt's be mutually independent over time. However this is not a practical assumption, e.g., in the video application, Lt is the background image sequence and one would expect it to be correlated over time. In this work we relax this and allow the Lt's to follow an autoregressive model. We are able to show that under mild assumptions and under a denseness assumption on the unestimated part of the changed subspace, with high probability (w.h.p.), ReProCS can exactly recover the support set of St at all times; the reconstruction errors of both St and Lt are upper bounded by a time invariant and small value; and the subspace recovery error decays to a small value within a finite delay of a subspace change time. © 2014 IEEE.


Luo W.,Dalian Maritime University | Luo W.,Traffic Management Research Institute | Ren J.,Dalian Maritime University
Proceedings of the 28th Chinese Control and Decision Conference, CCDC 2016 | Year: 2016

This paper studies support vector machine (SVM) for the parametric identification of ship coupled heave and pitch motions with real oceanic conditions. The simulation results are based on a mathematical model of a ship model in the simulated marine environment. By analyzing the identification precision of the equation parameters of coupled heave-pitch motions, this paper presents the proper numbers of data for identifying. Moreover, by analyzing the influence of sea states, the accurate results illustrate that the characteristics of coupled heave and pitch motions can be fully represented by the motion responses at high sea states. The mathematical model of coupled pitch-heave motion constructed with the estimated parameters is used for predicting the heave and pitch motion responses at different sea conditions. The prediction results illustrate that the effectiveness and generalization of the identification method based on SVM are very good. © 2016 IEEE.


Liu D.-B.,Traffic Management Research Institute
Jiaotong Yunshu Xitong Gongcheng Yu Xinxi/Journal of Transportation Systems Engineering and Information Technology | Year: 2013

With the goal of developing a resource-efficient traffic environment, this paper puts forward traffic performance evaluation system for highway ETC systems based on the principle of scientific, systematic and operability. It consideres the views of investors, managers and users and integrates the elements including vehicle travel speed, traffic delay, highway capacity, traffic safety, noise pollution and gas emission. Through a combined methodology of qualitative and quantitative research, it develops a system of quantified criteria for evaluation. Furthermore, it conducts extra-performance analyses on the ETC construction projects under various traffic flow conditions by applying the data envelopment analysis (DEA). This paper gives the ultra-efficient quantized value of the ETC construction projects under different traffic conditions as an example. It also works out the relative ratio of the effective value corresponding to different traffic to find out the root causes of low efficiency and to propose corresponding measures.


Qiu C.,Traffic Management Research Institute | Wu X.,Traffic Management Research Institute | Xu H.,Traffic Management Research Institute
2014 IEEE International Conference on Image Processing, ICIP 2014 | Year: 2014

In this work, we propose an online algorithm Recursive Projected Sparse Matrix Recovery (ReProSMR) for recovering a time sequence of sparse matrix St and a time sequence of dense matrix Lt from their sum Mt = Lt + St when Lts' lies in a slowly changing low dimensional tensor subspace. A key application where this problem occurs is in video layer separation where the goal is to separate a video sequence into a slowly changing low dimensional background sequence and a sparse foreground sequence. Mathematically, a 2D image can be thought of as a second order tensor. ReProSMR is a modification of Recursive Projected Compressive Sensing (ReProCS) based on tensor PCA. Experimental comparisons demonstrating the advantages and computation gain of ReProSMR are shown for both simulated and real videos. © 2014 IEEE.


Lu J.,Traffic Management Research Institute | Wang Y.,Traffic Management Research Institute | Dai L.,Traffic Management Research Institute | Gu J.,Traffic Management Research Institute
Applied Mechanics and Materials | Year: 2012

The left-turning traffic forbiddance measure is an important mode of traffic organization of intersection, but the traffic management departments are puzzled by the implementation condition, implementation method and efficiency evaluation. The traffic impact analysis of left-turning traffic flows and the advantages of left-turning traffic forbiddance measure is analyzed in paper, then the implementation flows is summarized. The implementation condition and method are determined, and the average delay of intersections in the whole region are chosen as the evaluation index of operation efficiency of the left-turning traffic forbiddance measure. So the calculation method of efficiency between pre and post adopted the left-turning traffic forbiddance measure is proposed. The intersections of business district in City Hengyang is chosen as example for verifying the implementation method of left-turning traffic forbiddance, and the efficiency between pre and post adopted the left-turning traffic forbiddance measure is comparatively analyzed and the VISSIM simulation software is applied for verifying the effect of the left-turning traffic forbiddance measure. © (2012) Trans Tech Publications, Switzerland.


Liu D.,Traffic Management Research Institute
ICTIS 2013: Improving Multimodal Transportation Systems - Information, Safety, and Integration - Proceedings of the 2nd International Conference on Transportation Information and Safety | Year: 2013

Although all types of road users are at risk of being injured or killed in a road traffic crash, there are notable differences in fatality rates between different road user groups. The "vulnerable" road users (VRUs), such as pedestrians and two-wheeler users, are at greater risk than vehicle occupants. In particular, with the popular use of the electric bicycle, the vulnerable road users involved in traffic accidents (VRUITAs) become more frequent in China. Therefore, the characteristics of VRUITAs were first explored from accident data. The crash composition and other measurements were analyzed in this study. The reasons for VRUITAs in China were then compared with those in developed countries from the aspects of legislation, driving training and traffic management. The results indicate that the vulnerable road users in China were more likely to break the traffic rules and take risky behavior. Several counter measures derived from developed countries were finally discussed to be further applied in China to reduce the VRUITAs. © 2013 American Society of Civil Engineers.


Wang J.,Traffic Management Research Institute | Zu Y.,Traffic Management Research Institute | Lu J.,Traffic Management Research Institute | Gu J.,Traffic Management Research Institute
ICTIS 2013: Improving Multimodal Transportation Systems - Information, Safety, and Integration - Proceedings of the 2nd International Conference on Transportation Information and Safety | Year: 2013

As a form of expressway direction information, there are no complete rules for urban expressway exit numbering in China. In addition, the national standards do not list rules for the marshaling method of urban expressway exit numbering. Referring to relevant rules stated in the national standard, "Road Traffic Signs and Markings", as well as comparing and analyzing the current situation of expressway exit numbering in Beijing, Shanghai, and Guangzhou, this research proposes marshaling rules of expressway exit numbering on the basis of the demand for directional sign informationization, current expressway types in China, and construction scale in different cities. The goal of this study is to provide drivers with the only and correct exit information to help them identify and confirm the exit position of their destination in the shortest time, allowing them to exit the expressway safely and smoothly. © 2013 American Society of Civil Engineers.

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