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| 1 | Research progress and development trends of highway tunnels in China显示文摘The highway tunnel system in China has in recent years surpassed Europe,the United States,and other developed countries in terms of mileage,scale,complexity,and technical achievement.Much scientific research has been conducted,and the results have greatly facilitated the rapid development of China's highway tunnel building capacity.This article presents the historical development of highway tunneling in China,according to specific characteristics based on construction and operation.It provides a systematic analysis of the major achievements and challenges with respect to construction techniques,operation,monitoring,repair,and maintenance.Together with future trends of highway tunneling in China,suggestions have been made for further research,and development prospects have been identified with the aim of laying the foundation for a Chinese-style highway tunnel construction method and technical architecture. | Chuan He Bo Wang | 2013 | Journal of Modern Transportation2013，21，4： | 64 |
| 2 | An improved algorithm for fluid-structure interaction of high-speed trains under crosswind显示文摘Based on the train-track coupling dynamics and high-speed train aerodynamics,this paper deals with an improved algorithm for fluid-structure interaction of high-speed trains.In the algorithm,the data communication between fluid solver and structure solver is avoided by inserting the program of train-track coupling dynamics into fluid dynamics program,and the relaxation factor concerning the load boundary of the fluid-structure interface is introduced to improve the fluctuation and convergence of aerodynamic forces.With this method,the fluid-structure dynamics of a highspeed train are simulated under the condition that the velocity of crosswind is 13.8 m/s and the train speed is 350 km/h.When the relaxation factor equals 0.5,the fluctuation of aerodynamic forces is lower and its convergence is faster than in other cases.The side force and lateral displacement of the head train are compared between off-line simulation and co-simulation.Simulation results show that the fluid-structure interaction has a significant influence on the aerodynamics and attitude of the head train under crosswind conditions.In addition,the security indexes of the head train worsen after the fluid-structure interaction calculation.Therefore,the fluid-structure interaction calculation is necessary for high-speed trains. | Tian LI Jiye ZHANG Weihua ZHANG | 2011 | Journal of Modern Transportation2011，19，2： | 29 |
| 3 | Evacuated tube transport technologies (ET3)^(tm):a maximum value global transportation network for passengers and cargo显示文摘Evacuated Tube Transport Technologies(ET3) offers the potential for more than an order of magnitude improvement in transportation efficiency,speed,cost,and effectiveness.An ET3 network may be optimized to sustainably displace most global transportation by car,ship,truck,train,and jet aircraft.To do this,ET3 standards should adhere to certain key principals:maximum value through efficiency,reliability,and simplicity;equal consideration for passenger and cargo loads;optimum size;high speed/high frequency operation;demand oriented;random accessibility;scalability;high granularity;automated control;full speed passive switching;open standards of implementation;and maximum use of existing capacities,materials,and processes. | Daryl OSTER Masayuki KUMADA Yaoping ZHANG | 2011 | Journal of Modern Transportation2011，19，1： | 25 |
| 4 | Numerical simulation and analysis of aerodynamic drag on a subsonic train in evacuated tube transportation显示文摘The aerodynamic drag on a train running in an evacuated tube varies with tube air pressure,train speed and shape,as well as blockage ratio.This paper uses numerical simulations to study the effects of different factors on the aerodynamic drag of a train running at subsonic speed in an evacuated tube.Firstly,we present the assumption of a steady state,two dimensional,incompressible viscous flow with lubricity wall conditions.Subsequently,based on the Navier-Stokes equation and the k-ε turbulent models,we calculate the aerodynamic drag imposed on the column train with a 3-meter diameter running under different pressure and blockage ratio conditions in an evacuated tube transportation (ETT) system.The simulation is performed with FLUENT 6.3 software package.An analyses of the simulation results suggest that the blockage ratio for ETT should be in the range of 0.25-0.7,and the tube internal diameter in the range of 2-4 m,with the feasible vacuum pressure in the range of 1-10 000 Pa for the future subsonic ETT trains. | Yaoping ZHANG | 2012 | Journal of Modern Transportation2012，20，1： | 18 |
| 5 | Elements of automated survey of pavements and a 3D methodology显示文摘Sound transportation infrastructure is critical for economic development and sustainability.Pavement condition is a primary concern among agencies of the roadway infrastructure.Automation has become possible in recent years on collecting data and producing results for certain aspects of pavement performance,while challenges remain in several other categories,such as automated cracking survey.This paper reviews the technological advances on automated survey of pavements,and discusses the most recent breakthroughs by the team led by the author in using 3D laser imaging for capturing 1 mm surface images of pavements. | Kelvin C.P.WANG | 2011 | Journal of Modern Transportation2011，19，1： | 17 |
| 6 | Advances in design theories of high-speed railway ballastless tracks显示文摘The design theories of the ballastless track in the world are reviewed in comparison with the innovative research achievements of high-speed railway ballastless track in China.The calculation methods and parameters concerning train load,thermal effect,and foundation deformation of high-speed railway ballastless track,together with the structural design methods are summarized.Finally,some suggestions on the future work are provided. | Xueyi LIU Pingrui ZHAO Feng DAI | 2011 | Journal of Modern Transportation2011，19，3： | 16 |
| 7 | Analysis of vibration reduction characteristics and applicability of steel-spring floating-slab track显示文摘A coupled dynamics computation model for metro vehicles,along with a steel-spring floating-slab track,is developed based on the theory of vehicle-track coupled dynamics.Using the developed model,the influences of the thickness,length and mass of floating-slab,spring rate and its arrangement space,running speed,etc.on the time and frequency domain characteristics of steel-spring fulcrum force are analyzed.The applicability of steel-spring floating-slab track is discussed through two integrated example cases of metro and buildings possessing distinct natural vibra-tion characteristics.It is concluded that,it is quite significant,in the optimization modular design of the parameters of steel-spring floating-slab track,to take the matching relationship of both the amplitude-frequency characteristics of steel-spring fulcrum force and natural vibration characteristics of integrated structures into comprehensive considera-tion.In this way the expensive steel-spring floating-slab track can be economically and efficiently utilized according to the site condition,and at the same time,the economic losses and bad social impact resulted from the resonance during usage of steel-spring floating-slab track can be avoided. | Wanming ZHAI Peng XU Kai WEI | 2011 | Journal of Modern Transportation2011，19，4： | 14 |
| 8 | Autonomous vehicles: challenges, opportunities, and future implications for transportation policies显示文摘This study investigates the challenges and opportunities pertaining to transportation policies that may arise as a result of emerging autonomous vehicle(AV)technologies. AV technologies can decrease the transportation cost and increase accessibility to low-income households and persons with mobility issues. This emerging technology also has far-reaching applications and implications beyond all current expectations. This paper provides a comprehensive review of the relevant literature and explores a broad spectrum of issues from safety to machine ethics. An indispensable part of a prospective AV development is communication over cars and infrastructure(connected vehicles). A major knowledge gap exists in AVtechnology with respect to routing behaviors. Connectedvehicle technology provides a great opportunity to implement an efficient and intelligent routing system. To this end, we propose a conceptual navigation model based on a fleet of AVs that are centrally dispatched over a network seeking system optimization. This study contributes to the literature on two fronts:(i) it attempts to shed light on future opportunities as well as possible hurdles associated with AV technology; and(ii) it conceptualizes a navigation model for the AV which leads to highly efficient traffic circulations. | Saeed Asadi Bagloee Madjid Tavana Mohsen Asadi Tracey Oliver | 2016 | Journal of Modern Transportation2016，24，4： | 14 |
| 9 | Lattice-Valued Proposition Logic(Ⅱ)显示文摘Lattice-ValuedPropositionLogic(Ⅱ)QinKeyun;XuYang(Dept.ofAppl.Mathematics,SouthwestJiaotongUniversity)Chengdu610031,ChinaLatti... | Qin Keyun Xu Yang( Dept. of Appl. Mathematics, Southwest Jiaotong University)Chengdu 610031,China | 1994 | Journal of Modern Transportation1994，11，1： | 13 |
| 10 | Key vacuum technology issues to be solved in evacuated tube transportation显示文摘Evacuated tube transportation(ETT) will be one of the ultra-large-scale vacuum application areas.This paper lists some key vacuum technology issues in ETT:(1) how to construct ultra-large-scale vacuum chamber with lower cost and high reliability,(2) how to evacuate gas out of the ETT tube in short time,(3) how to release heat or reduce temperature in the vacuum tube,(4) how to avoid vacuum discharge,(5) how to make vehicles with airproof shells and life support system,and(6) how to detect leaks and find leak positions efficiently.At the same time,some solutions are proposed. | Yaoping ZHANG Daryl OSTER Masayuki KUMADA Jianye YU Shengshan LI | 2011 | Journal of Modern Transportation2011，19，2： | 13 |
| 11 | Experimental study of temperature gradient in track slab under outdoor conditions in Chengdu area显示文摘Temperature is one of the important loads for designing slab track. The characteristic of slab track temperature varies greatly with different regional climates. In this work, a bi-block slab track model was built under outdoor conditions in Chengdu area; the statistical characteristic of temperature gradient in track slab and the relationship between temperature gradient and surface air temperature were tested and analyzed. The results show that the track slab temperature gradient will vary periodically according to the surface air temperature, and show a clear nonlinearity along the height direction. The temperature gradient distribution is extremely uneven: the temperature gradient in the top part of the track slab is larger than that in the bottom part; the most frequently occurring temperature gradient of the track slab is around-3.5 °C/m and more than75 % locates in the level-10 to 10 °C/m; concrete with a relatively good heat exchange condition with the surrounding air has a narrower band distribution. In addition, the frequency distribution histogram should exclude the time zone from 00:00 to 06:00 because there is almost no traffic in this period. The amplitude of track slab temperature variation is obviously lower than that of the air temperature variation, and the former is approximately linear with the latter. | Pingrui Zhao Xueyi Liu Guan Liu | 2014 | Journal of Modern Transportation2014，22，3： | 12 |
| 12 | Aerodynamic simulation of evacuated tube maglev trains with different streamlined designs显示文摘Based on the Navier-Stokes (N-S) equations of incompressible viscous fluids and the standard k-ε turbulence model with assumptions of steady state and two dimensional conditions, a simulation of the aerodynamic drag on a maglev train in an evacuated tube was made with ANSYS/FLOTRAN software under different vacuum pressures, blockage ratios, and shapes of train head and tail. The pressure flow fields of the evacuated tube maglev train under different vacuum pressures were analyzed, and then compared under the same blockage ratio condition. The results show that the environmental pressure of 1 000 Pa in the tube is the best to achieve the effect of aerodynamic drag reduction, and there are no obvious differences in the aerodynamic drag reduction among different streamline head shapes. Overall, the bluntshape tail and the blockage ratio of 0.25 are more efficient for drag reduction of the train at the tube pressure of 1 000 Pa. | Xuyong CHEN Lifeng ZHAO Jiaqing MA Yuansen LIU | 2012 | Journal of Modern Transportation2012，20，2： | 11 |
| 13 | The approach to calculate the aerodynamic drag of maglev train in the evacuated tube显示文摘In order to study the relationships between the aerodynamic drag of maglev and other factors in the evacuated tube,the formula of aerodynamic drag was deduced based on the basic equations of aerodynamics and then the calculated result was confirmed at a low speed on an experimental system developed by Superconductivity and New Energy R&D Center of South Jiaotong University.With regard to this system a high temperature superconducting magnetic levitation vehicle was motivated by a linear induction motor(LIM) fixed on the permanent magnetic guideway.When the vehicle reached an expected speed,the LIM was stopped.Then the damped speed was recorded and used to calculate the experimental drag.The two results show the approximately same relationship between the aerodynamic drag on the maglev and the other factors such as the pressure in the tube,the velocity of the maglev and the blockage ratio.Thus,the pressure,the velocity,and the blockage ratio are viewed as the three important factors that contribute to the energy loss in the evacuated tube transportation. | Jiaqing Ma Dajing Zhou Lifeng Zhao Yong Zhang Yong Zhao | 2013 | Journal of Modern Transportation2013，21，3： | 10 |
| 14 | Identifying the relationship between suspension parameters of underframe equipment and carbody modal frequency显示文摘As a critical component of the railway vehicle,underframe equipment has a great influence on the ride comfort of railway vehicles due to their big mass and active vibration. Therefore, study on the relationship between suspension parameters of underframe equipment and the modal frequency of carbody is extremely crucial for controlling the ride quality of railway vehicles. In this paper, a finite element model of the carbody was developed to investigate the effects of the suspension location, the mass of the suspension equipment, and the suspension frequency on the mode of the carbody. Then, the matching relationship between the suspension parameters and the modal frequency of the carbody was studied through the transfer function. In addition, roller rig tests were performed to verify the numerical simulation model of the carbody. The results show that the suspension parameters of the underframe equipment have a great influence on the mode of the carbody, especially for the frequency of the first bending mode. To improve the frequency of carbody high-frequency bending and reduce energy transfer, equipment with a large mass should be suspended toward the middle of the carbody. The weight of the equipment strongly affects the first bending frequency and energy transfer of the carbody. The frequency of heavy suspended equipment should be sufficiently low to increase the transmissibility of high frequencies and improve the vibration characteristics of the carbody. Although the bending frequency of the carbody can be improved effectively by increasing the suspension stiffness of thesuspension equipment, in order to reduce carbody vibration effectively, the suspension frequency of the equipment should be slightly lower than the carbody bending frequency. | Guangbing Luo Jing Zeng Qunsheng Wang | 2014 | Journal of Modern Transportation2014，22，4： | 10 |
| 15 | Progress in high-speed train technology around the world显示文摘This is a review of high-speed train development in the sense of technology advances all over the world.Three generations of high-speed trains are classified according to their technical characteristics and maximum operating speed.Emphasis is given to the newly developed high-speed train in China,CRH380.The theoretical foundations and future development of CRH380 are briefly discussed. | Li ZHOU Zhiyun SHEN | 2011 | Journal of Modern Transportation2011，19，1： | 9 |
| 16 | Connect & Drive:design and evaluation of cooperative adaptive cruise control for congestion reduction显示文摘Road throughput can be increased by driving at small inter-vehicle time gaps.The amplification of velocity disturbances in upstream direction,however,poses limitations to the minimum feasible time gap.This effect is covered by the notion of string stability.String-stable behavior is thus considered an essential requirement for the design of automatic distance control systems,which are needed to allow for safe driving at time gaps well below 1 s.Using wireless inter-vehicle communications to provide real-time information of the preceding vehicle,in addition to the information obtained by common Adaptive Cruise Control(ACC) sensors,appears to significantly decrease the feasible time gap,which is shown by practical experiments with a test fleet consisting of six passenger vehicles.The large-scale deployment of this system,known as Cooperative ACC(CACC),however,poses challenges with respect to the reliability of the wireless communication system.A solution for this scalability problem can be found in decreasing the transmission power and/or beaconing rate,or adapting the communications protocol.Although the main CACC objective is to increase road throughput,the first commercial application of CACC is foreseen to be in truck platooning,since short distance following is expected to yield significant fuel savings in this case. | Jeroen PLOEG Alex F.A.SERRARENS Geert J.HEIJENK | 2011 | Journal of Modern Transportation2011，19，3： | 9 |
| 17 | Generalization of the Fourier transform-based method for calculating the response of a periodic railway track subject to a moving harmonic load显示文摘A Fourier transform-based method has been developed for calculating the response of a railway track as an infinitely long uniform periodic structure subject to moving or stationary harmonic loads. The track may become a non-uniform periodic structure by, for example, rail dampers which are installed between sleepers to control rolling noise and roughness growth. The period of the structure may become greater than the sleeper spacing. For those new situations, the current version of the method cannot be directly applied; it must be generalized and this is the aim of this paper. Generalization is performed by applying periodic conditions to each type of support and summarizing contributions from all types of support. Responses of the rail, sleeper, and damper are all formulated as an inverse Fourier transform from wavenumber domain to spatial domain. The generalized method is applied to investigate dynamics of a typical track with rail dampers of particular design. It is found that the rail dampers can significantly suppress the pinned–pinned vibration of the original track, widen the stop bands and increase vibration decay rate along the rail. However, it is also found that a new pinned–pinned mode is created by the dampers and between about 450 and 1,300 Hz dampers vibrate stronger than the rail, making noise radiation from the dampers a potential issue. These concerns must be fully investigated in the future. The formulae presented in this paper provide a powerful tool to do that. | Xiaozhen Sheng | 2015 | Journal of Modern Transportation2015，23，1： | 9 |
| 18 | Using Kalman filter algorithm for short-term traffic flow prediction in a connected vehicle environment显示文摘We develop a Kalman filter for predicting traffic flow at urban arterials based on data obtained from con-nected vehicles. The proposed algorithm is computationally efficient and offers a real-time prediction since it invokes the connected vehicle data just before the prediction period. Moreover, it can predict the traffic flow for various pene-tration rates of connected vehicles (the ratio of the number of connected vehicles to the total number of vehicles). At first, the Kalman filter equations are calibrated using data derived from Vissim traffic simulator for different penetra-tion rates, different fluctuating arrival rates of vehicles and various signal settings. Then the filter is evaluated for a variety of traffic scenarios generated in Vissim simulator. We evaluate the performance of the algorithm for different penetration rates under several traffic situations using some statistical measures. Although many of the previous pre-diction methods depend highly on data from fixed sensors (i.e., loop detectors and video cameras), which are associ-ated with huge installation and maintenance costs, this study provides a low-cost mean for short-term flow prediction only based on the connected vehicle data. | Azadeh Emami Majid Sarvi Saeed Asadi Bagloee | 2019 | Journal of Modern Transportation2019，27，3： | 9 |
| 19 | Advances of research on high-speed railway catenary显示文摘The interaction between the catenary and pantograph is one of the most crucial factors that determine the train operation in high-speed railway. The bad state of catenary is able to directly influence the power supply safety of traction power system. In this paper, four aspects on the catenary research of high-speed railway are reviewed in detail, namely the solution methods for catenary equilibrium state, the dynamic modeling methods of catenary, the non-contact detection methods of catenary, and the static and dynamic evaluation methods of catenary. In addition, their recent advances are described. For the low solution accuracy of the initial equilibrium state of catenary, the structure finding method with multi-objective constraint and nonlinear finite element procedure are introduced to solve the problem. For the catenary's dynamic modeling, considering the influence of environmental wind on the catenary, environmental wind simulations and wind tunnel tests are used to obtain theaerodynamic coefficients and build the wind field along the catenary for analysis of its wind vibration characteristics.In order to improve the detection accuracy of non-contact detection for the catenary, the deep learning theory and real-time detection algorithms should be adopted in the future. In view of the lack of dynamic assessment method for the catenary, the modern spectrum evaluation, time–frequency analysis, big data technology and their combinations will be the important means for future catenary evaluation. | Zhigang Liu Yang Song Ye Han Hongrui Wang Jing Zhang Zhiwei Han | 2018 | Journal of Modern Transportation2018，26，1： | 9 |
| 20 | Wave-current interaction with a vertical square cylinder at different Reynolds numbers显示文摘Large eddy simulation is performed to study three-dimensional wave-current interaction with a square cylinder at different Reynolds numbers, ranging from 1,000 to 600,000. The Keulegan-Carpenter number is relevantly a constant of 0.6 for all cases. The Strouhal number, the mean and the RMS values of the effective drag coefficient in the streamwise and transverse directions are computed for various Reynolds numbers, and the velocity of a representative point in the turbulent zone is simulated to find the turbulent feature. It is found that the wave-current interaction should be considered as three-dimensional flow when the Reynolds number is high; under wave-current effect, there exists a critical Reynolds number, and when the Reynolds number is smaller than the critical one, current effect on wave can be nearly neglected; conversely, with the Reynolds number increasing, wave-current- structure interaction is sensitive to the Reynolds number. | Azhen Kang Bing Zhu | 2013 | Journal of Modern Transportation2013，21，1： | 8 |
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