Study on horizontal and vertical temperature gradient of ballastless track on curve lineEI北大核心

Research purposes: In order to get the time-varying rules of temperature field distribution in the track structure with superelevation and build the horizontal and vertical temperature gradient of ballastless track, a continuous observation of CRTS II; by using temperature sensors on curve segment of a passenger dedicated line was held. Research conclusions: (1) The temperature change of ballastless track between daytime and nighttime is big, the temperature changing value of surface was 24.7℃ in maximum, 19℃ in average. (2) The temperature changing value became small and the time of maximum temperature come late with the increase of distance to surface. (3) At the bottom of the track structure, the temperature changing value was 6.1℃ in maximum, 5.0℃ in average. (4) Fitting curve of vertical temperature gradient of longitudinally connected ballastless track on curve line can be exponential curve, and the curve sharp can match the distribution about the vertical temperature gradient of the code for design of bridge and culvert in China. (5) The horizontal temperature gradient of the CRTS II; longitudinally connected ballastless track included the track slab and support layer, temperature gradient of track slab could be fitted by using quadratic function, temperature gradient of support layer could be fitted by using piecewise linear function. (6) This study can provide guidance for the temperature load model in the design of high speed railway in central China.     

ABSTRACTS

Strengthen Security Management to Ensure Consistent and Stable Freight Transporta- tion By Adopting and implementing ＂Being High-standard, Scientific and Consistent＂
SU Shun-hu （Transportation Bureau, MOR, Beijing 100844, China）
Abstract： After reviewing the work that has been done this year in aspect of railway freight transport safety, in light of the strategic deployment of the MOR Party Group and requirements of ＂being high standard, scientific and consistent＂, the author deeply analyses the severe situations that are facing upon China Railways and puts forth a series of requirements in this regard, to be briefly speaking, to strengthen the basis for freight transport for improvement of security management level in an all around way; to further enhance construction of freight transport security system for technical backup of safety management; to carry out safety special project management for elimination of outstanding safety problems; to enhance co-management among different departments; to go ahead with key projects for guarantee of consistent and stable transport safety.
Key words： Railway; Freight Transport Safety; Management     

The History and Development of IGBT

In this paper,IGBT history is briefl y reviewed and IGBT chip technology is discussed in detail,especially for soft punch through,carrier injection enhancement and trench technologies.Concurrently with the improvements in chip technology,there has been rapid development of the packaging technology which will be discussed in this paper.Some suggested technologies of IGBT in the future are presented to conclude the paper.     

Regularity analysis on transient over-voltage of grounding grid by lighting strokes in substationsEI北大核心

Research purposes: Lightning has been one of the important factors endangering safe and reliable operation of the railway. The grounding grid performance plays a particularly important role in lightning protection. In this paper, the author has established a grounding grid transient model by the electromagnetic transient analysis software and intended for quantitative analysis of typically grounding grid layout in engineering practice, to lay important theoretical basis for future lightning protection and grounding. Research conclusions: (1) The results show that the ground potential is significantly affected by the soil resistivity, lightning current amplitude and the mesh size. With increase of the soil resistivity and lightning current amplitude, the ground potential at the point of the lightning current injection will significantly improve, but due to the spark discharge of the soil. The ground potential does not increase exponentially with potential lightning current amplitude. The smaller the mesh size, the better the ground potential attenuation. For example of the lightning current 20 kA and the soil resistivity 100 Ω·m, the ground potential of the 5 m×5 m mesh decreases 22.3% compared with the 10 m×10 m mesh. (2) The study finds that the ground potential attenuation away from the lightning strike point at 15 m basically reaches the maximum, which is about 89%. And the degree of attenuation is independent of lightning current amplitude. (3) The results are mainly used for optimization program and design fields on substation lightning protection and grounding.     

Research on the Mechanical Properties of Transparent Sand Based on Triaxial TestEI北大核心

Research purposes: Transparent sand is a new type of geotechnical engineering material, which is made of fused silica sand and porous liquid with the same refractive index. In order to understand its mechanical properties, the CU and CD tests of fused silica sand with a particle size of 0.5~1.0 mm and 1.0~3.0 mm are carried out by triaxial apparatus, and the stress-strain curves, pore water pressure changes and effective stress ratio of the two are compared and analyzed. In addition, E-μ model parameters of coarse and fine sand are calculated respectively, which provide corresponding parameters for further numerical calculations. Research conclusions:(1) The loose sample's stress-strain curve shows hardening characteristics. (2) The coarse particle specimen with steeper stress-strain curve comes to the peak at faster velocity than fine particle specimen. (3)The pore pressure value of the coarse particle specimen is greater than the fine particle, the pore water pressure coefficient of the two shows a decreasing trend with the increase of the confining pressure. (4) Transparent sand can be used to simulate natural sand and the change of diameter can represent different soils. (5) The research results can provide reference for model tests based on transparent soil technique. © 2018, Editorial Department of Journal of Railway Engineering Society. All right reserved.     

地铁迷流对钢筋混凝土中钢筋腐蚀的试验研究

By means of the mechanism of electrochemical corrosion of anodic oxidization of rebars in reinforced concrete main structure and metallic pipelines buried underground in metro，this paper deals with the simulation of two kinds of corrosive media，namely water and soil，in which reinforced concrete specimen is positioned，and executes the corrosion of rebars in concrete specimen under different external electric potential，simultaneously tests the electrochemical equivalent and corrosion rate of rebars in concrete specimen which is positioned in the two corrosive media.Through analyzing the measured data，it can be inferred that electrochemical equivalent and corrosion rate of metals are influenced by the corrosive environmental media，and the electrochemical equivalent of natural corrosion for metals can not be utilized to calculate the magnitude of metal corrosion induced by metro stray current flow.     

ABSTRACTS

Security Technology of Japan Shinkansen Railway Yu Zhanyou 1
The operation record with zero mortality of Japan Shinkansen for 45 years is based on their management idea of ＂safety first＂, strong disaster prevention awareness, advanced and mature technology but not pursuing the most advanced guiding ideology, a set of legal procedures, the severe technology certification system, the accurate traffic control system, the strict overhaul system, as well as the examination and maintenance system. In this paper, the successful experiences of Japan Railway are introduced and summarized, which have important references for safety guarantee of China urban rail transit industry.     

Analysis of train derailment after hitting the pier of tongling yangtze river bridge combined road with railwayEI北大核心

Research purposes: Precise prediction for mechanical behavior of the bridge under ship collision force is important to assess the analysis of train derailment after hitting the pier. This paper focuses on the Tongling Yangtze River Bridge Combined Road with Railway for ship collision simulation, uses the nonlinear finite element software of ANSYS/LS-DYNA to simulate the ship's bow section of 10000 t and 5000 t class hitting bridge tower column at front and axle to 20° of side in highest navigable water level, conventional navigable water level and the minimum navigable water level. Curves of collision force-period at different working conditions are summarized. On this basis, when the impact load affects as input loads, the displacement and acceleration response can be used by finite element analysis under the collision and study the dynamic response of the bridge caused by a train derailment risk. Research conclusions: (1) The impact force of the bridge is largest when a laden ship is hitting the pier at the highest navigable water level. In the most unfavorable condition, the collision have lardge impact on bridge structure and derailment risk of trains. (2) The transverse acceleration of the girder on the top of 2# pier can reach to 0.922 m/s2, but it does not exceed acceleration excitation limit (1 m/s2) when 3# piers are hitted by the 10000 t ship at the peak load of collision, so the probability of train derailment is minimal. (3) Based on the probability formula of the derailment by simplifying risk criteria, the derailment probability of train is 9×10-5~1.5×10-4 during the ship-bridge collision. (4) The research results can provide the reference for train traffic safety on railway bridge caused by ship collisions.     

ABSTRACTS

Applying the Scientific Outlook on Development to Promote the Construction of Urban Rail Transit
-C Thinking on Current Construction Development of China Urban Rail Transit Jiao Tongshan 1
The construction of China Urban Rail Transit is now staying in the important time with rapid development. The achievements we obtained are objectively summarized. At the same time, the contradiction between the current construction speed and preliminary work, the construction procedure, the phenomena of despising operation, the unified planning of traffic integration, the control of construction standards, the difference of fare in domestic urban rail transit, as well as the enhancement of government management for urban rail transit are analyzed and investigated through some phenomena in the industry. Several suggestions are also presented.     

ABSTRACTS

Research and Development of Railway Logistic Comprehensive Management System
Following the constant transfer of railway freight stations into railway logistic centers, the business of railway freight transportation has profound change, so the current top priority is developing and establishing the logistic comprehensive management system adapting for railway transport modernization and market demand. The railway logistic comprehensive management system was researched and the business process of the system was optimized from the aspects of characteristic analysis, general idea and key technologies of railway logistic system; the system was developed and established by using BPM workflow engine and development platform as well as Application Integration Platform （ALP）, and the main functions of the system was expounded in this paper.     

Research on the Influence of Vertical Deformation of Bridge on the Track RegularityEI北大核心

Research purposes: The vertical deformation of high-speed railway (HSR) bridge will cause the track irregularity, which threatens the safe and efficient operation of the HSR. Taking the 32 m simple supported beam bridge as the research object, based on the existing mapping analytical model for bridge vertical deformation and rail geometry, the influence of the track regularity of the CRTS Ⅰ slab ballastless track structure caused by the key parameters such as the bridge vertical deformation amplitude, the hanging length of the beam end and the vertical stiffness of mortar layer were studied, and the corresponding measures to control the rail deformation were proposed, to provide theoretical reference for comprehensive treatment of rail deformation of HSR bridge. Research conclusions:(1) The pier settlement, the vertical rotation of the beam end and the beam fault will cause the rail to follow the beam deformation, and "up-warping" of the rail on the vertical deformation boundary will appear. (2) The rail deformation is directly proportional to the vertical deformation amplitude of the bridge and the key to control the rail deformation is to reduce the vertical deformation of the bridge. (3) The rail deformation can be controlled by reducing the hanging length of beam and vertical stiffness of mortar layer. (4) The research results can provide a theoretical reference for controlling the vertical rail deformation of high-speed railway bridges. © 2018, Editorial Department of Journal of Railway Engineering Society. All right reserved.     

Thoughts on Transferring Traditional Operation to Full-process Logistic Service

Through expounding the methods of Guiyang South Station transferring to full-process logistic service such as exerting transport market by transferring mechanism, integrating station with dedicated line as to create special market, trying to create brand of full-process transportation, and convoying loading and transportation by jointless connection and ＂front-shop and back workshop＂, based on analyzing ＂three obvious items＂ and ＂three deficiencies＂ existing in practice, this paper puts forward the measures of transferring to the full-process logistic service in further step, such as organizing self-supporting train fleet and mastering market initiative; optimizing price mechanism and adapting for market demand; well building logistic port depending on changed center; and increasing hardware level and strengthening the capacity of freight yard.     

Prediction and Control of Wheel/Rail Noise for Rail Transit(Abstract of the Ph.D.Dissertation)

On the basis of the theory of vehicle-track coupling dy-namics and noise radiation and propagation,a model ofwheel/rail noise prediction for the rail transit is founded andthe software for wheel/rail noise prediction is developed.Inthe model,the wheel is …     

ABSTRACTS

Innovation and Practice of Freight Transport Organization Mode in Suihua Car Depot
WU Zhong-kai（Suihua Car Depot, Harbin Railway Administration, Suihua 152000, Heilongjiang, China）
Abstract： Based on analyzing freight transport status of Suihua Car Depot in Harbin Railway Administration, targeting with status of the car depot and problems existing in traditional freight transport organization mode, the operation flow of freight transportation is re-established from 4 aspects of locomotive assembly, territorial transportation, inland organization and shipments arrangement. In the end, according to the freight transport innovation and practice of Suihua Car Depot, this paper puts forward suggestions on increasing innovation of railway freight transport organization mode, such as exerting advantages of resource, realizing win-win between railway freight transportation and clients and enhancing service aim. Key Words： Suihua Car Depot; Freight Transport Organization; Innovation; Operation Flow     

pared by Thermal OxidationZHEN

School, National University of Defense Technology,Changsha 410073,CHN;2. Department of Physics,Dalian University of Technology,Dalian 116023,CHN)ZnO thin films were fabricated on the P-Si,high resistivity Si,ceramic and N-Si substrates by thermal oxidation in air.The oxidation time was fixed to 1h at 300℃~800℃.The effects of different substrates such as the P-Si(111),the high resistivity Si,the ceramics substrates and the N-Si are investigated.To obtain high-quality ZnO films,some Zn films are also annealed in the oxygen.It is found that the ZnO films prepared on the high resistivity Si substrates exhibit the better excitonic ultraviolet (UV) emission,the ceramics substrates exhibit the better deep level visible emission.The ZnO fil     

ABSTRACTS

Study on the Mode for Developing Heavy-haul Transport on Railway Existing Lines （Transportation and Economics Research Institute, China Academy of Railway Sciences, Beijing 100081, China） Abstract： Heavy-haul transport is an important organization way of railways increasing transport capacity and transport benefits.     

英文摘要

Service System and Marketing Strategy of Railway Freight Transport
Guo Yu-hua （Bureau of Transport, MOR, Beijing 100844, China）
Abstract： By using theories of service system and service marketing system, the author analyzes railway freight service system and the railway freight marketing system, and also the strategy in railway freight marketing system. It is suggested that railway freight should establish the marketing strategy with comparative advantages of technical sources and organizational sources, and also the market development strategy that could convert source advantages into market power.     

Technology Innovation Guards the High-speed Rail Electric Multiple Unit(EMU) Trains' Operation Safety

正Shanghai EMU Depot is located in the Yangtze River Delta that is the most developed economy area in China.It mainly undertakes maintenance and application tasks of high speed EMU trains from Grade One to Grade Five.By rule,high-speed EMU trains′maintenance mileages at all levels are respectively as follows:Grade One is 3 000km;Grade Two,100 000km;Grade     

ABSTRACTS

Discussion on Freight Transport Organization Reform in Shenyang Railway Administration
ZANG Jun, AN Yang（Marketing Department, Shenyang Railway Administration, Shenyang 110001, Liaoning, China）
Abstract： This paper expounds the implementation effects of freight transport organization reform in Shenyang Railway Administration from 4 aspects such as simplifying handle process, implementing ＂real freight system＂ transportation, checking up and standardizing freight transport charge and developing whole- process logistics. At the same time, the paper analyzes the problems existing in the process of freight transport organization reform, and puts forward many operable suggestions such as reasonably adjusting railway transport capacity, coordinating charge policy of two-end service with market, adjusting existing tariff management mechanism and improving the tariff falling mechanism, all of these could make freight transport reform more adapting to market.     

英文摘要

Discussion on Construction Planning of Test Line for Urban Train
Yu Hongpeng, Sun Ning, Guo Yiqing 2
Combining with the actual demand of test for urban train and the test results of the first train of Shenyang Metro Line 1 on loop test line of China Academy of Railway Sciences, the improvement and further construction planning points of test line are comprehensively presented.