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2nd International Conference on Power, Communication, Computing and Networking Technologies, PCCNT 2024

作者： Li, Chun Qian, Jiayu Zhang, Bing Liu, Jingwei Jinan Rail Transit Group Construction Investment Co. Ltd Jinan250014 China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and Technology Xuzhou221116 China Jinan Liwen Geotechnical Engineering Co. LTD. Jinan250061 China

ISBN: (纸本)9781837242672

The reinforcement of soft sandy soil foundation is not only the important problem of fast consolidation facility project security, but also an important measure related to the safety of civil engineering. Through field tests, the ultimate bearing characteristics of monopiles formed by rapid consolidation using curing agent were studied under different working conditions. By designing six different length-to-diameter ratio of the monopile working conditions for vertical and water calm load test. The test results indicate that the ultimate vertical bearing capacity of monopiles under six working conditions ranges from 7-54 kN. The vertical bearing capacity of monopiles increases as the pile diameter and length increase. However, increasing the pile length will lead to higher ultimate bearing capacity, but also results in increased settlement at the pile top, which fails to meet the design's displacement requirements. To address this, it is necessary to increase the pile diameter to improve lateral friction resistance and reduce settlement displacement. Additionally, the horizontal ultimate bearing capacity of a single pile increases with the length of the pile. For a pile diameter of 10 cm, the ultimate bearing capacity for pile lengths of 0.5m and 1m are 0.975 kN and 1.4 kN respectively, with the bearing capacity primarily influenced by the pile's strength. The pile did not fracture when the pile diameter was increased to 30cm and the pile length was 0.5m. The ultimate bearing capacity of bearing platform with infill pile is 400kN, which is 23.1% higher than that without infill pile, so the bottom infill pile can obviously improve the ultimate bearing capacity of foundation. © The Institution of engineering & Technology 2024.

关键词： Piles

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A scheme for train communication information management in onboard-centered train control system

A scheme for train communication information management in o...

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2022 International Conference on Frontiers of Traffic and Transportation engineering, FTTE 2022

作者： Yang, Zixuan Yuan, Lei Liu, Yu National Engineering Laboratory for Urban Rail Transit Communication and Operation Control Beijing Jiaotong University Beijing100044 China State Key Lab of Rail Traffic Control & Safety Beijing Jiaotong University Beijing100044 China

ISBN: (纸本)9781510657526

The latest development trend of train control system is to realize autonomous control of trains through vehicle-ground and vehicle-vehicle wireless communication. In this paper, we propose a scheme to manage the communication information of the train, which is suitable for the onboard-centered train control system. This scheme explains the parts that the train and ground equipment are responsible for in the process of managing the train's communication information, and how they work in each scenario by describing their message interaction flow. The features of the scheme are distributed management and data self-recovery after equipment failure. Then, a time automaton model is established with the train communication information management process in the train registration scenario as the object, and the function of the scheme is verified by the UPPAAL tool. The verification results show that the designed scheme can complete the train communication information management function when the equipment works normally or a single ground equipment fails. © 2022 SPIE.

关键词： Information management

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Extension of Harmonic Product Spectrum and Its Application in Bearing Condition Monitoring 1

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UNIfied Conference of International Workshop on Defence Applications of Multi-Agent Systems, DAMAS 2023, International Conference on Maintenance engineering, IncoME-V 2023, International conference on the Efficiency and Performance engineering Network, TEPEN 2023

作者： Chen, Bingyan Wang, Shengbo Cheng, Yao Gu, Fengshou Zhang, Weihua Zhou, Zewen Huang, Li State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong University Chengdu610031 China Centre for Efficiency and Performance Engineering University of Huddersfield HuddersfieldHD1 3DH United Kingdom School of Computer Sichuan Technology and Business University Chengdu611745 China

ISBN: (数字)9783031494130

ISBN: (纸本)9783031494123

Accurate condition monitoring and timely fault diagnosis are very important for rotating machinery equipment. The harmonic product spectrum (HPS) based on envelope spectrum has been proven to be an effective fault diagnosis tool by revealing the cyclostationarity of fault signals of rotating machinery. However, its performance under different interfering noises has not been well explored and revealed. In this paper, based on the recently proposed generalized envelope spectra, three new versions of HPS are first proposed using log-envelope spectrum, fractional envelope spectrum and squared envelope spectrum respectively. Subsequently, the effects of discrete harmonic noise, random impulse noise and Gaussian background noise on the performance of envelope spectrum-based HPS and three new versions of HPS are comparatively investigated by numerical simulation signals. The results show that different versions of HPS show different robustness to different interference noises. The robustness of HPS based on log-envelope spectrum to random impulse noise is stronger than that based on envelope spectrum and squared envelope spectrum. When Gaussian background noise is dominant, the four HPSs have similar capabilities to reveal cyclostationarity. Finally, four HPSs are applied to the condition monitoring of rolling bearings by virtue of their capability to characterize cyclostationarity. The experimental results show that the four HPSs can not only effectively monitor the degradation status of rolling bearings but also accurately diagnose early faults. This work provides new and effective tools for condition monitoring of rolling bearings. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Condition monitoring

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Effect of wheel polygonal wear on axle fatigue life 8

Effect of wheel polygonal wear on axle fatigue life

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8th International Conference on Traffic engineering and Transportation System, ICTETS 2024

作者： Tang, Mingjun Wu, Xingwen Guan, Zheng Yang, Ningrui Chi, Maoru CRRC Qingdao Sifang CO. LTD. Shandong Qingdao266111 China Southwest Jiaotong University School of Mechanical Engineering Sichuan Chengdu610031 China Research Report of State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong University Sichuan Chengdu610031 China

ISBN: (数字)9781510686298

ISBN: (纸本)9781510686281

During prolonged high-speed operation, wheels can develop uneven circumferential wear, leading to out-of-round conditions that exacerbate wheel-rail interactions. As a critical component of high-speed trains, axles bear significant loads, making accurate fatigue life assessment essential for safe operation. This study examines the impact of polygonal wheel wear on the fatigue life of high-speed train axles. Using a specific high-speed train wheelset model, a rigid-flexible coupling dynamic model was established to account for wheelset flexibility. Dynamic stress at key axle positions was calculated using the modal stress recovery method and validated via the finite element method (FEM). This study investigated the influence of polygonal wheel wear on axle bending stress and assessed fatigue life at critical axle points using the nominal stress method. Results indicate that polygonal wheel wear amplitude significantly affects bending stress ranges at key axle positions. Bending stress induced by polygonal wheel wear shows nonlinear characteristics with increasing vehicle speed. Under different polygonal wear orders, axle stress variation peaks at 173 Hz, 270 Hz, 580 Hz, 690 Hz, and 930 Hz, corresponding to wheel-rail coupled vibration modes. Fatigue damage at axle points increases with the amplitude of polygonal wheel wear, with the highest damage observed in the transition zone between the gearbox seat and wheel seat. This damage value is 0.56 under a 0.2 mm polygonal wheel wear amplitude, meeting design requirements. © 2024 SPIE.

关键词： Fatigue damage

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A critical review of wheel/rail high frequency vibration-induced vibration fatigue of railway bogie in China

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railway Sciences 2024年第2期3卷 177-215页

作者： Xingwen Wu Zhenxian Zhang Wubin Cai Ningrui Yang Xuesong Jin Ping Wang Zefeng Wen Maoru Chi Shuling Liang Yunhua Huang School of Mechanical Engineering Southwest Jiaotong UniversityChengduChina State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong UniversityChengduChina Key Laboratory of High-speed Railway Engineering Ministry of Education Southwest Jiaotong UniversityChengduChina

Purpose–This review aims to give a critical view of the wheel/rail high frequency vibration-induced vibration fatigue in railway ***/methodology/approach–Vibration fatigue of railway bogie arising from the wheel/rail high frequency vibration has become the main concern of railway *** reviews usually focused on the formation mechanism of wheel/rail high frequency *** paper thus gives a critical review of the vibration fatigue of railway bogie owing to the short-pitch irregularities-induced high frequency vibration,including a brief introduction of short-pitch irregularities,associated high frequency vibration in railway bogie,typical vibration fatigue failure cases of railway bogie and methodologies used for the assessment of vibration fatigue and research ***–The results showed that the resulting excitation frequencies of short-pitch irregularity vary substantially due to different track types and formation *** axle box-mounted components are much more vulnerable to vibration fatigue compared with other *** wheel polygonal wear and rail corrugation-induced high frequency vibration is the main driving force of fatigue failure,and the fatigue crack usually initiates from the defect of the weld *** spectrum for attachments of railway bogie defined in the standard underestimates the vibration level arising from the short-pitch *** current investigations on vibration fatigue mainly focus on the methods to improve the accuracy of fatigue damage assessment,and a systematical design method for vibration fatigue remains a huge gap to improve the survival probability when the rail vehicle is subjected to vibration ***/value–The research can facilitate the development of a new methodology to improve the fatigue life of railway vehicles when subjected to wheel/rail high frequency vibration.

关键词： Wheel/rail high frequency vibration Vibration fatigue railway bogie Fatigue damage assessment

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Dynamic Behaviour of railway Axle Box Bearing Raceway Excited by Wheel Polygonal Wear 1

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作者： Luo, Yaping Wang, Zhiwei Huang, Zixing Zhang, Weihua Chen, Bingyan Song, Dongli Wang, Tingting State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong University Sichuan Chengdu610031 China School of Mechanical and Electrical Engineering University of Electronic Science and Technology of China Sichuan Chengdu611731 China School of Automation Chengdu University of Information Technology Sichuan Chengdu610225 China

ISBN: (数字)9783031494215

ISBN: (纸本)9783031494208

Being the connection between the bogie frame and wheelset, axle box bearing directly withstands the high-frequency wheel-rail impact and vehicle load. The polygonal wear exacerbates wheel-rail impact, which may lead to a deterioration in the performance of the axle box bearing, even threatening even threatening the train’s safety. To investigate the dynamic behaviour of axle box bearings, a rigid-flexible coupled vehicle-track dynamics model is developed. This model considers the dynamic interactions between the bearings and the vehicle components, as well as numerous nonlinear factors such as bearing stiffness, gear meshing, track irregularity and wheel polygonal wear. Then, the flexible axle box, wheelset, and gear box sub-models are integrated into the vehicle dynamics model. Subsequently, the developed model is validated by the field-tested axle box accelerations. Based on this, dynamic behaviour of axle box bearing excited by wheel polygonal wear is analyzed and discussed. Results show that the vibration and contact force acting on the axle box bearing increase with the amplitude of polygonal wear. The influence of high-order wheel polygonal wear on bearing vibration and contact force is more significant. In specific, the vibration at the position of axle box bearing’s outer ring under the wheel polygonal wear is slightly higher in amplitude compared to the vibration of inner ring. The contact force between roller and outer raceway is greater than the contact force between roller and inner raceway. These conclusions can be potentially considered in the design and maintenance of axle box bearings for railway vehicles. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Deterioration

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Point cloud-based environment reconstruction and ray tracing simulations for railway tunnel channels

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High-Speed railway 2023年第4期1卷 241-247页

作者： Ziyi Qi Ruisi He Mi Yang Xuejian Zhang Bo Ai Weiming Li Shaopeng Wang Wenpu Sun Lizhe Li School of Electronic and Infomation Engineering Beijing Jiaotong UniversityBeijing 100044China State Key Laboratory of Advanced Rail Autonomous Operation Beijing Jiaotong UniversityBeijing 100044China Beijing Mass Transit Railway Operation Corporation Signals and Telecoms Branch Company Beijing 100044China

Radio propagation environment plays a critical role in the performance of wireless communication systems,and understanding channel characteristics is vital for ensuring reliable communication links and optimizing system *** tracing is an effective method to investigate propagation characteristics in a complex environment,and how to quickly and accurately obtain environmental information needs to be *** paper presents dynamic environment reconstruction and ray tracing simulation in railway tunnel environment based on Simultaneous Localization and Mapping(SLAM)algorithm and Poisson reconstruction *** channel parameters are obtained and analyzed based on ray tracing *** straight and curved tunnels are considered and investigated,and the results show the channel characteristics in complex railway tunnel environments.

关键词： railway communication Tunnels Ray tracing Environment reconstruction Wireless channel

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Integrated Optimization of Energy Storage Allocation and Train Speed Control in Urban rail transit Systems

Integrated Optimization of Energy Storage Allocation and Tra...

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第43届中国控制会议

作者： Junyu Shi Zhaosen Chen Jiateng Yin Andrea D'Ariano Jun Xu State Key Laboratory of Advanced Rail Autonomous Operation Beijing Jiaotong University Department of Engineering Roma Tre University Nanchang Rail Transit Group Co. Ltd.

ISBN: (数字)9789887581581

ISBN: (纸本)9798350366907

With the promotion of "double carbon" plan in China,the energy-saving problem of urban rail transit,as a major energy user of the government,has garnered significant *** urban rail train operations,the energy storage devices(ESDs)can temporarily store the regenerative energy from braking trains and feed it back to other accelerating ***,the ESDs comes with a high price tag and limited *** minimize the overall energy consumption of urban rail lines with limited ESDs,this paper addresses the collaborative optimization of ESD allocation and train speed profiles,in order to coordinate the usage of energy among ESDs and accelerating/braking trains,such that the overall energy consumption,i.e.,the consumed energy for train acceleration subtracting the used regenerated energy,can be ***,we construct a mixed-integer programming(MIP) model to collaboratively optimize the train running speed curve(with accelerating,coasting and braking) and ESD locations.A series of constraints are developed to limit the flow of energy among ESDs and the state transition of running ***,we verify the feasibility and effectiveness of our integrated approach using real-world data from Beijing Metro Yizhuang Line.

关键词： Subway system ESD energy-efficient train control regenerative energy

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Mechanochemical reactions of GaN-Al_(2)O_(3) interface at the nanoasperity contact:Roles of crystallographic polarity and ambient humidity

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Friction 2022年第7期10卷 1005-1018页

作者： Jian GUO Jian GAO Chen XIAO Lei CHEN Linmao QIAN School of Mechanical Engineering University of South ChinaHengyang 421001China Tribology Research Institute State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengdu 610031China Advanced Research Center for Nanolithography(ARCNL) Science Park 106Amsterdam 1098XGthe Netherlands Technology and Equipment of Rail Transit Operation and Maintenance Key Laboratory of Sichuan Province Southwest Jiaotong UniversityChengdu 610031China

Mechanochemical reactions of the GaN-Al_(2)O_(3) interface offer a novel principle for scientific and technological merits in the micro-/nano-scale ultra-precision surface *** this work,the mechanochemical reactions on Ga-and N-faced GaN surfaces rubbed by the Al_(2)O_(3) nanoasperity as a function of the environmental humidity were *** results indicate that the N-face exhibits much stronger mechanochemical removal over the relative humidity range of 20%-80%than the *** water molecules in environmental conditions significantly promotes the interfacial mechanochemical reactions and hence accelerates the atomic attrition on *** hypothesized mechanism of the selective water-involved mechanochemical removal is associated with the dangling bond configuration,which affects the mechanically-stimulated chemical reactions via altering the activation energy barrier to form the bonding bridge across the sliding *** findings can enrich the understanding of the underlying mechanism of mechanochemical reactions at GaN-Al_(2)O_(3) interface and a broad cognition for regulating the mechanochemical reactions widely existing in scientific and engineering applications.

关键词： crystallographic polarity ambient humidity mechanochemical removal GaN-Al_(2)O_(3)interface

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Automatic Modulation Classification Based on CNN, LSTM and Attention Mechanism

Automatic Modulation Classification Based on CNN, LSTM and A...

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International Conference on Computer and Communications (ICCC)

作者： Zewen Wang Ping Wang Pingying Lan School of information science and technology Southwest Jiaotong University Chengdu China State Key Laboratory of Rail Transit Engineering Informatization FSDI Xi'an China

Automatic modulation recognition (AMR) is a key technology in the field of cognitive radio. To improve the performance, a new model for AMR, which incorporates an attention mechanism to extract the important features of the signal more effectively, is proposed in this paper. The simulation results show that our proposed method has a good recognition performance. In addition, our method can still achieve high accuracy, even if only a few samples are provided as the training set for training. We also visualize the output features of the model and show the positive effect of the attention mechanism on signal modulation category identification.

关键词： Training Simulation Computational modeling Modulation Data visualization Feature extraction Data models

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