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Wireless Relay Communication on high speed railway：Full Duplex or Half Duplex？

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China Communications 2016年第11期13卷 14-26页

作者： Jia You Zhangdui Zhong Zhongzhao Dou Jing Dang Gongpu Wang State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing China School of Computer and Information Technology Beijing Jiaotong University Beijing China School of Electronic and Information Engineering South China University of Technology Guangzhou China Air Force Military Representative Office in Hua Bei Beijing China

In this paper,we introduce one full-duplex(FD) relaying transmission scheme for high speed railway and compare its ergodic capacity and outage performance with half-duplex(HD) relaying scheme. Both decode-and-forward(DF) amplify-and-forward(AF) relay modes are considered. Moreover,the carriage penetration loss(CPL) and the self-interference(SI) cancellation ratio are investigated. We derive the closed-form expressions for the outage probability and ergodic capacity of both HD and FD relay transmission schemes. It is shown that when CPL is larger than a certain level,the FD relay can achieve better performance in terms of capacity and keep the outage probability in a low level. It is also found that three factors: AF or DF modes,CPL and SI cancellation ratio,can have impact on capacity performance,and that CPL is one decisive factor. Our results can provide theoretical supports for development and deployment of future wireless communication systems on high speed railways.

关键词： full duplex relay high speed railway mobile relay outage probability channel capacity

Adaptive Antenna-Activation Based Beamforming for Large-Scale MIMO Communication Systems of high speed railway

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China Communications 2016年第9期13卷 12-23页

作者： Meng Cheng Shaoshi Yang Xuming Fang Post-Doctoral Working Station Wuhan Railway Bureau Provincial Key Laboratory of Information Coding and Transmission Southwest Jiaotong University School of Electronics and Computer Science University of Southampton

Large-scale array aided beamforming improves the spectral efficiency(SE) as a benefit of high angular *** dual-beam downlink beamforming is applied to the train moving towards cell edge,the inter-beam ambiguity(IBA) increases as the directional difference between beams becomes *** adaptive antenna activation based beamforming scheme was proposed to mitigate *** the district near the base station(BS),all antenna elements(AEs) were activated to generate two *** the distance from the train to the BS increased,only the minimum number of AEs satisfying the resolution criterion would be *** the cell edge,one beam was switched off due to intolerable *** proposed scheme can achieve SE gain to the non-adaptive scheme and show more robustness against the direction-of-arrival(DOA) estimation error.

关键词： wireless communications adap- tive antenna activation large-scale antenna array downlink beamforming high speed railway

Behaviour of non-ballast pre-stressed and precast track structures in high speed railway based on multiscale finite element model

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high-speed railway 2023年第1期1卷 70-85页

作者： Yuhang Wang Jjun Wang Qi Tang Jike Tan Guobing Lu railway Engineering Research Institute China Academy of Railway SciencesBeijing 100081China School of Civil Engineering Chongqing UniversityChongqing 400045China Institute of Constructional Engineering CISDI Engineering Co.LtdChongqing 400013China State Key Laboratory of Mountain Bridge and Tunnel Engineering Chongqing Jiaotong UniversityChongqing 400074China

In order to make further study on the mechanical property of CRTSIII type slab non-ballast track structures,which was self-designed in China,based on the method of the multiscale finite element model(FEM),the traditional FEM of slab non-ballast track structures was *** multiscale FEM of CRTSII type slab nonballast track structures was established based on the general finite element program *** the comparative calculation was made between various FEMs,showing that the high solution precision,fast modelling speed and high solution efficiency could be ***,the multiscale FEM was suitable for the parametric study on mechanical behaviour of CRTSII type slab non-ballast track structures,and then the key influence factor and constructions could be optimized.

关键词： high speed railway Non-ballast track Multiscale Finite element model

Development of rail technology for high speed railway in China

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railway Sciences 2023年第4期2卷 431-446页

作者： FengShou Liu Guang Yang Zhaoyang Chen Yinhua Zhang Qingyue Zhou Metals and Chemistry Research Institute China Academy of Railway Sciences Corporation LimitedBeijingChina

Purpose–The purpose of this paper is to summarize the status and characteristics of rail technology of high-speed railway in China,and point out the development direction of rail technology of high-speed ***/methodology/approach–This study reviews the evolution of high-speed rail standards in China,comparing their chemical composition,mechanical attributes and geometric specifications with EN *** delves into the status of rail production technology,shifts in key performance indicators and the quality characteristics of *** analysis further examines the interplay between wheels and rails,the implementation of grinding technology and the techniques for inspecting rail service *** encapsulates the salient features of rail operation and maintenance within the high-speed railway *** paper concludes with an insightful prognosis of high-speed railway technology development in ***–The rail standards of high-speed railway in China are scientific and advanced,highly operational and in line with international *** quality and performance of rail in China have reached the world’s advanced *** 60N profile guarantees the operation quality of wheel–rail interaction *** rail grinding technology system scientifically guarantees the long-term good service performance of the *** rail service state detection technology is scientific and *** rail technology will take“more intelligent”and“higher speed”as the development direction to meet the future needs of high-speed railway in ***/value–The development direction of rail technology for high-speed railway in China is defined,which will promote the continuous innovation and breakthrough of rail technology.

关键词： high speed railway Rail Wheel–rail interaction Intelligent operation and maintenance

high speed railway promoting development of low-carbon economy in China

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Engineering Sciences 2011年第4期9卷 71-77页

作者： Zhou Xinjun Transportation and Economics Institute China Academy of Railway Sciences Beijing 100081 China

Low-carbon Economy is a kind of economic developing mode which takes low energy consumption,low pollution and low discharge as its foundation. It is another important revolution of the human society after the agriculture civilization and industry civilization. It deals with various fields including low-carbon energy,low-carbon agriculture,low-carbon industry,low-carbon transportation and low-carbon life,etc. Among those,low-carbon transportation is one of the important contents. Since high speed railway uses electricity as driving force,it runs without discharging waste gas,and it is a kind of clean and green transportation with little dust and smoke black. Therefore,the study of the relationship between the high speed railway and low-carbon economy is becoming one of the important frontier problems that confronting the theoretic circle. With demonstration analysis and comparative analysis,this paper discusses the comparative advantages of high speed railway in terms of energy saving and environment protection,treatment of sound pollution,land saving and reduction of external cost(mainly pollution treatment cost) ,etc. compared with the other transportation modes and ordinary railway. Taking Beijing-Tianjin Intercity railway as an example,the paper further demonstrates the distinctive advantages in respect of energy conservation and emission reduction. Besides,the paper also predicates the low-carbon effects after several high speed railways is put into operation in a few years. It is concluded that the development of high speed railways will meet the need of low-carbon economy and is significant for sustainable and steady development of economy and society.

关键词： high speed railway low-carbon economy resource environment sustainable development effects

Medium-term forecast of daily passenger volume of high speed railway based on DLP-WNNMedium-term forecast of dailypassenger volume of high speedrailway based on DLP-WNN

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railway Sciences 2023年第1期2卷 121-139页

作者： Tangjian Wei Xingqi Yang Guangming Xu Feng Shi School of Transportation Engineering East China Jiao Tong UniversityNanchangChina Institute for Transport Studies University of LeedsLeedsUK School of Economics and Management Beihang UniversityBeijingChina School of Traffic and Transportation Engineering Central South UniversityChangshaChina

Purpose – This paper aims to propose a medium-term forecast model for the daily passenger volume of highspeed railway (HSR) systems to predict the daily the Origin-Destination (OD) daily volume formultiple consecutivedays (e.g. 120 days).Design/methodology/approach – By analyzing the characteristics of the historical data on daily passengervolume of HSR systems, the date and holiday labels were designed with determined value *** accordance to the autoregressive characteristics of the daily passenger volume of HSR, the Double LayerParallel Wavelet Neural Network (DLP-WNN) model suitable for the medium-term (about 120 d) forecast of thedaily passenger volume of HSR was established. The DLP-WNN model obtains the daily forecast result byweighed summation of the daily output values of the two subnets. Subnet 1 reflects the overall trend of dailypassenger volumes in the recent period, and subnet 2 the daily fluctuation of the daily passenger volume toensure the accuracy of medium-term *** – According to the example application, in which the DLP-WNN modelwas used for the medium-termforecast of the daily passenger volumes for 120 days for typical O-D pairs at 4 different distances, the averageabsolute percentage error is 7%-12%, obviously lower than the results measured by the Back Propagation (BP)neural network, the ELM (extreme learning machine), the ELMAN neural network, the GRNN (generalizedregression neural network) and the VMD-GA-BP. The DLP-WNN model was verified to be suitable for themedium-term forecast of the daily passenger volume of ***/value – This study proposed a Double Layer Parallel structure forecast model for medium-termdaily passenger volume (about 120 days) of HSR systems by using the date and holiday labels and WaveletNeural Network. The predict results are important input data for supporting the line planning, scheduling andother decisions in operation and management in HSR systems.

关键词： high speed railway Passenger flow forecast Daily passenger volume Medium-term forecast Wavelet neural network

Design Innovation and Practice of“One Stationwith One Landscape”for high speed railway Stations

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Chinese railways 2022年第1期 24-31页

作者： SUN Xing CAO Yonggang ZHANG Ting Architectural Engineering Design and Research Institute China Railway Engineering Consulting Group Co.Ltd. China railway Engineering Consulting Group Co.Ltd.

Since the founding of New China,railway station design has experienced a long development and evolution process,and has now developed to the fourth generation,which is called the New Era railway *** by the new concept of building up a“well-connected fully-integrated,envionmeni-friendly passenger-oriented,economic-efficient,culturally-rich,intelligent and convenient”station,the station building becomes more personalized and specialized displaying distinctive effects,and the design connotation of“one station with one landscape”has also been widened and deepened From the simple differentiated design of facade image,the design is gradually becoming station-specific and customized with station-city integrated development and passengers'boarding and alighting feelings as the *** purpose is to make the station truly become a prominent card and landmark building that facilitates city development.

关键词： high speed railway high speed railway stations one station with one landscape overall design

Investigation of monitoring system for high-speed railway subgrade frost heave

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Research in Cold and Arid Regions 2015年第5期7卷 528-533页

作者： GuoTao Yang ZaiTian Ke DeGou Cai HongYe Yan JianPing Yao Feng Chen School of Civil Engineering Beijing Jiaotong University China railway Corporation railway Engineering Research Institute China Academy of Rails Science

This paper presents methods for monitoring frost heave, device requirements, testing principals, and data analysis re- quirements, such as manual leveling observation, automatic monitoring （frost heave, frost depth, and moisture）, track dynamic detection, and track status detection. We focused on the requirements of subgrade frost heave monitoring for high speed railways, and the relationship of different monitoring methods during different phases of the railway. The com- prehensive monitoring system of high speed railway subgrade frost heave provided the technical support for dynamic design during construction and safe operation of the rail system.

关键词： high speed railway frost heave monitoring automatic monitoring manual leveling observation rail detection

Study on the pattern of train arrival headway time in high-speed railway

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railway Sciences 2024年第3期3卷 344-366页

作者： Changhai Tian Shoushuai Zhang railway Science and Technology Research and Development Center China Academy of Railway Sciences Corporation LimitedBeijingChina School of transportation and logistics Southwest Jiaotong UniversityChengduChina

Purpose-The design goal for the tracking interval of high-speed railway trains in China is 3 min,but it is difficult to achieve,and it is widely believed that it is mainly limited by the tracking interval of train *** the train arrival tracking interval can be compressed,it will be beneficial for China's high-speed railway to achieve a 3-min train tracking *** goal of this article is to study how to compress the train arrival tracking ***/methodologylapproach-By simulating the process of dense train groups arriving at the station and stopping,the headway between train arrivals at the station was calculated,and the pattern of train arrival headway was obtained,changing the traditional understanding that the train arrival headway is considered the main factor limiting the headway of ***-When the running speed of trains is high,the headway between trains is short,the length of the station approach throat area is considerable and frequent train arrivals at the station,the arrival headway for the first group or several groups of trains will exceed the headway,but the subsequent sets of trains will havea headway equal to the arrival *** convergence characteristic is obtained by appropriately increasing the running ***/value-According to this pattern,there is no need to overly emphasize the impact of train arrival headway on the *** plays an important role in compressing train headway and improving high-speedrailwaycapacity.

关键词： high speed railway Train headway Train arrival headway Regular pattern Paper type Research paper