Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies

Nanjing, China

Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies

Nanjing, China

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Jiang R.,Ningbo University | Zheng P.,Ningbo University | Zheng P.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies
Applied Mathematics and Mechanics (English Edition) | Year: 2017

Flow around an oscillating cylinder in a subcritical region are numerically studied with a lattice Boltzmann method (LBM). The effects of the Reynolds number, oscillation amplitude and frequency on the vortex wake modes and hydrodynamics forces on the cylinder surface are systematically investigated. Special attention is paid to the phenomenon of resonance induced by the cylinder oscillation. The results demonstrate that vortex shedding can be excited extensively under subcritical conditions, and the response region of vibration frequency broadens with increasing Reynolds number and oscillation amplitude. Two distinct types of vortex shedding regimes are observed. The first type of vortex shedding regime (VSR I) is excited at low frequencies close to the intrinsic frequency of flow, and the second type of vortex shedding regime (VSR II) occurs at high frequencies with the Reynolds number close to the critical value. In the VSR I, a pair of alternately rotating vortices are shed in the wake per oscillation cycle, and lock-in/synchronization occurs, while in the VSR II, two alternately rotating vortices are shed for several oscillation cycles, and the vortex shedding frequency is close to that of a stationary cylinder under the critical condition. The excitation mechanisms of the two types of vortex shedding modes are analyzed separately. © 2017 Shanghai University and Springer-Verlag Berlin Heidelberg


Cheng R.,Ningbo University | Cheng R.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | Liu F.,Ningbo University | Liu F.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | And 2 more authors.
Nonlinear Dynamics | Year: 2017

In this paper, a new continuum model is developed based on full velocity difference car-following model, which takes the traffic jerk effect into account. The critical condition for traffic flow is derived, and density waves occur in traffic flow because of the small disturbance. Near the neutral stability line, nonlinear analysis is taken to derive the KdV–Burgers equation for describing the density wave, and one of the solutions is given. Numerical simulation is carried out to show the local traffic described by the model. © 2017 Springer Science+Business Media Dordrecht


Cheng R.,Ningbo University | Cheng R.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | Ge H.,Ningbo University | Ge H.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | Wang J.,Zhejiang University
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2017

Considering the driver's timid and aggressive behaviors simultaneously, a new continuum model is put forwarded in this paper. By applying the linear stability theory, we presented the analysis of new model's linear stability. Through nonlinear analysis, the KdV–Burgers equation is derived to describe density wave near the neutral stability line. Numerical results verify that aggressive driving is better than timid act because the aggressive driver will adjust his speed timely according to the leading car's speed. The key improvement of this new model is that the timid driving deteriorates traffic stability while the aggressive driving will enhance traffic stability. The relationship of energy consumption between the aggressive and timid driving is also studied. Numerical results show that aggressive driver behavior can not only suppress the traffic congestion but also reduce the energy consumption. © 2017 Elsevier B.V.


Lu L.,Ningbo University | Lu L.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | Ren G.,Nanjing Southeast University | Wang W.,Nanjing Southeast University | And 2 more authors.
Accident Analysis and Prevention | Year: 2016

At unsignalized crosswalks, interactions between pedestrians and vehicles often lead to traffic safety hazards due to absence of traffic control and unclear right-of-ways. To address this safety problem, there is a need to understand the interaction behaviors of pedestrians and vehicles that are complicated by a variety of traffic and roadway attributes. The prime objective of this study is to establish a reliable simulation model to represent the vehicle yielding and pedestrian crossing behaviors at unsignalized crosswalks in a realistic way. The model is calibrated with detailed behavioral data collected and extracted from field observations. The capability of the calibrated model in predicting the pedestrian-interaction events as well as estimating the driver yielding rate and pedestrian delay are also tested and demonstrated. Meanwhile, the traffic dynamics in the vicinity of the crosswalk can be meaningfully represented with simulation results based on the model. Moreover, with the definitions of the vehicle-pedestrian conflicts, the proposed model is capable to evaluate the pedestrian safety. Thereby, the simulation model has the potential to serve as a useful tool for assessing safety performance and traffic operations at existing facilities. Furthermore, the model can enable the evaluation of policy effectiveness and the selection of engineering treatments at unsignalized crosswalks to improve safety and efficiency of pedestrian crossing. © 2016 Elsevier Ltd.


Wu L.,Ningbo University | Jiang G.,Ningbo University | Jiang G.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | Li H.,Ningbo University | Chen L.,Ningbo Road Transport Administration
ICTE 2015 - Proceedings of the 5th International Conference on Transportation Engineering | Year: 2015

In order to further reduce the cost of road freight transport, the influence of the railway freight transport reformation on Ningbo road general freight transport industry are analyzed based on the review of background and core contents of the reformation. As a result, the railway freight reform will bring more cooperation opportunities than competition, which created new opportunities for Ningbo to build a comprehensive land transport system and the development of logistics services. From the standpoint of cooperation-competition development, multimodal transport and the transformation of modern logistics, countermeasures are proposed for the transport of less-than-truckload freight on road. © ASCE.


Liu H.,Ningbo University | Liu H.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | Cheng R.,Zhejiang University | Zhu K.,Ningbo University | And 2 more authors.
Nonlinear Dynamics | Year: 2015

Based on the optimal velocity model, a new continuum model considering traffic jerk effect is presented in this paper. Then, the critical condition for the steady traffic flow is deduced. Near the neutral stability line, nonlinear analysis is taken to derive the KdV-Burgers equation for describing the density wave, and one of the solutions is given. Numerical simulation is carried out to study the influence about the traffic jerk effect. © 2015 Springer Science+Business Media Dordrecht


Cui Y.,Ningbo University | Cheng R.-J.,Zhejiang University | Ge H.-X.,Ningbo University | Ge H.-X.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies
Nonlinear Dynamics | Year: 2014

Based on single-lane traffic model, a two-lane traffic model is presented considering the velocity difference control signal. The stability condition of the model is obtained by the control theory. The delayed feedback control signal is added to the two-lane model, and the corresponding stability condition is derived again. The numerical simulations show that as the stability conditions are satisfied, the small disturbance will not amplify with and without control signal. In the meantime, the stability is strengthened as the control signal is considered. So the control signal would suppress the traffic disturbance successfully. © 2014, Springer Science+Business Media Dordrecht.


Liu B.,Ningbo University | Jiang G.,Ningbo University | Jiang G.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | Chen J.,Ningbo University
ICLEM 2014: System Planning, Supply Chain Management, and Safety - Proceedings of the 2014 International Conference of Logistics Engineering and Management | Year: 2014

In order to improve the trading efficiency in the shipping market of Ningbo, reduce the investment risk and promote the transformation and upgrade of Ningbo port, the container freight index scheme of Ningbo (which is comprised of basic data collection methods, a freight index system and freight index calculation methods) is designed by analyzing the main overseas shipping indices and typical domestic shipping indices. The test results of the actual data indicate that the design scheme not only embodies the price fluctuation for special routes in the container shipping market of Ningbo, but also provides effective information for participants and decision-makers in the shipping market. © 2014 American Society of Civil Engineers.


Li H.,Ningbo University | Jiang G.,Ningbo University | Jiang G.,Ningbo University of Technology | Jiang G.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | Wu L.,Ningbo University
ICTE 2015 - Proceedings of the 5th International Conference on Transportation Engineering | Year: 2015

In order to clarify the relationship between port logistics and economic growth, based on data of port logistics and economic development in Ningbo from 1990 to 2013, the dynamic correlation and causality between Ningbo's port logistics and economic growth has been analyzed via co-integration and Granger test. The empirical results reveal that there is a long-run stationary relation between port logistics and economic growth in Ningbo; and a unidirectional causality between the both, namely, both cargo throughput and container throughput of Ningbo port are Granger causes of economic growth, and container throughput is Granger cause of cargo throughput, not vice versa. According to the experimental results, conclusions and suggestions are put forward from the sustainable level. © ASCE.


Ge H.-X.,Ningbo University | Ge H.-X.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | Zheng P.-J.,Ningbo University | Zheng P.-J.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | And 2 more authors.
Physica A: Statistical Mechanics and its Applications | Year: 2015

Based on optimal velocity car following model, a new model considering traffic jerk is proposed to describe the jamming transition in traffic flow on a highway. Traffic jerk means the sudden braking and acceleration of vehicles, which has a significant impact on traffic movement. The nature of the model is researched by using linear and nonlinear analysis method. A thermodynamic theory is formulated to describe the phase transition and critical phenomenon in traffic flow. The time-dependent Ginzburg-Landau (TDGL) equation and the modified Korteweg-de Vries (mKdV) equation are derived to describe the traffic flow near the critical point and the traffic jam. In addition, the connection between the TDGL and the mKdV equations are also given. © 2015 Published by Elsevier B.V.

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