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Development and engineering application of integrated safety monitoring systems for China’s high-speed trains

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Transportation Safety and Environment 2024年第2期6卷 36-44页

作者： Yan Zhu Tiantian Wang Ruiyuan Shen Jingsong Xie Jingsong Yang Guoqin Zhang Hongqi Tian Xifeng Liang School of Traffic and Transportation Engineering Central South UniversityChangsha 410075HunanChina crrc changchun railway vehicles co. LtdChangchun 130062JilinChina China State railway Group co. Ltd.Beijing 100084China

With the improvement of the running speed of China’s high-speed trains,the demands for running status monitoring and security assurance of High-speed Electric Multiple Units(EMU)have increased significantly.However,the current safety monitoring systems are independent,which is not co.ducive to the co.prehensive monitoring and information sharing of the whole vehicle.The temperature monitoring of running gear is insensitive to early failures.How to develop a train operation safety monitoring system with strong engineering implementation and high integration is a key problem to be solved.For the monitoring of running stationarity,frame stability and running gear health of China’s high-speed trains,an integrated safety monitoring system framework is designed,and the logic and algorithm for the diagnosis of stationarity,stability and health states of rotating parts are co.structed.Monitoring software which fused the temperature,high and low frequency vibration data is developed,and the design and installation of the vibration temperature co.posite sensors are co.pleted.The research results have realized the integration and co.prehensive processing of multiple monitoring systems,co.pleted the improvement from single co.ponent and vehicle-level safety monitoring to multi-system,train-level and interactive monitoring.In the process of real vehicle application,the developed monitoring system acquires the vehicle operation status data accurately and in real time.The co.structed diagnosis algorithm and logic evaluates the vehicle operation status accurately and in a timely manner,and avoids the progression from fault to accident.The research results show that the integrated safety monitoring system can provide technical support for train operation safety.

关键词： electric multiple units(EMU) integrated safety monitoring system stationarity stability fault diagnosis

Influences of the Fresh Air Volume on the Removal of co.gh-Released Droplets in a Passenger Car of a High-Speed Train Using CFD

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co.puter Modeling in Engineering & Sciences 2024年第3期138卷 2727-2748页

作者： Jun Xu Kai Bi Yibin Lu TiantianWang Hang Zhang Zeyuan Zheng Fushan Shi Yaxin Zheng Xiaoying Li Jingping Yang crrc changchun railway vehicles co. Ltd.Changchun130062China Key Laboratory of Traffic Safety on Track Ministry of EducationSchool of Traffic&Transportation EngineeringCentral South UniversityChangsha410075China co.lege of Mechanical and Vehicle Engineering Hunan UniversityChangsha410082China

The spread and removal of pollution sources,namely,co.gh-released droplets in three different areas(front,middle,and rear areas)of a fully-loaded passenger car in a high-speed train under different fresh air flow volume were studied using co.putational fluid dynamics(CFD)method.In addition,the structure of indoor flow fields was also analysed.The results show that the large eddies are more stable and flow faster in the air supply under Mode 2(fresh air volume:2200m3/h)co.pared to Mode 1(fresh air volume:1100m3/h).By analysing the spreading process of droplets sprayed at different locations in the passenger car and with different particle sizes,the removal trends for droplets are found to be similar under the two air supply modes.However,when increasing the fresh air flow volume,the droplets in the middle and front areas of the passenger car are removed faster.When the droplets had dispersed for 60s,Mode 2 exhibited a removal rate approximately 1%–3%higher than Mode 1 for small and medium-sized droplets with diameters of 10 and 50μm.While those in the rear area,the situation is reversed,with Mode 1 slightly surpassing Mode 2 by 1%–3%.For large droplets with a diameter of 100μm,both modes achieved a removal rate of over 96%in all three regions at the 60 s.The results can provide guidance for air supply modes of passenger cars of high-speed trains,thus suppressing the spread of virus-carrying droplets and reducing the risk of viral infection among passengers.

关键词： co.gh-released pollutants CFD ventilation inside trains supply air volume

Method with reliable accuracy and fast speed for measuring operational current of HTS NI closed-loop co.ls in steady persistent-current-mode

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Superco.ductivity 2024年第1期9卷 65-73页

作者： Li Lu Wei Wu Xin Yu Zhuoyan Zhong Kai Li Chengyun Pan Mengzhu Li Zhijian Jin School of Electrical Engineering and Electronic Information Shanghai Jiao Tong UniversityMinghang District200240 ShanghaiPR China Shanghai Superco.ductor Technology co. Ltd.Pudong New District201203 ShanghaiPR China crrc changchun railway vehicles co. Ltd.Changchun 130062JilinPR China

This study proposes a method for measuring the operational current of high temperature superco.ducting(HTS)non‐insulation(NI)closed‐loop co.ls,which operate in the steady persistent‐current‐mode(PCM).HTS NI closed‐loop co.ls are promising for many easily‐quenching direct‐current(DC)applications,where their performance is determined by magnetomotive forces,total number of turns,and dimensions.As the primary interface parameter in an application system,the operational current must be accurately and rapidly measured.Generally,this is achieved by dividing the measured magnetic field by the co.l co.stant.However,even if the influence of the screening current induced field(SCIF)is not co.sidered,existing methods for the co.l co.stant may be disturbed by the performance and location of Hall sensors,or experience a long measuring period.Therefore,a relatively accurate and fast method is proposed in this study,which is based on adjusting the output current of the adjustable power supply and monitoring the co.l voltage as an indicator.The proposed method was validated through experiments and simulations using an equivalent circuit model co.pled with a finite element method(FEM)model,and its current accuracy can be equivalent to the resolution of the employed power supply.It was demonstrated that this method reduced the requirements for Hall sensor’s performance and location,and has a more reliable accuracy in co.trast to the simulation method.co.pared to the experimentally co.ventional method,the proposed method presents a significantly faster speed.The impact of the SCIF was co.sidered and proven to be negligible for the tested pancake co.ls.Even for co.ls whose co.l co.stant vibrates owing to the SCIF,this method can be adapted to directly measure various operational currents.Furthermore,it was demonstrated that the measurement error can be influenced by the current discrepancy among turns when the co.l is not in the steady PCM,and a procedure for reducing this error was proposed.

关键词： Operational current HTS NI closed‐loop co.ls Measurement method Adjustable power supply co.l voltage

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升力翼列车通过隧道的气动效应研究

Journal of Central South University 2024年第3期31卷 1003-1016页

作者：王田天黄大飞王军彦施方成朱彦张雷高广军 co.lege of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China Key Laboratory of Traffic Safety on Track of Ministry of Education School of Traffic&Transportation EngineeringCentral South UniversityChangsha 410075China crrc changchun railway vehicles co. LtdChangchun 130062China

升力翼列车是一种通过增加升力翼来提升气动升力的新概念列车,可等效降低自身重力,有效减少轮轨磨损。本研究基于RNG k−ε湍流模型,采用滑移网格模拟方法,研究了不同攻角升力翼列车通过隧道的气动效应,并通过动模型实验数据对数值计算... 详细信息

升力翼列车是一种通过增加升力翼来提升气动升力的新概念列车,可等效降低自身重力,有效减少轮轨磨损。本研究基于RNG k−ε湍流模型,采用滑移网格模拟方法,研究了不同攻角升力翼列车通过隧道的气动效应,并通过动模型实验数据对数值计算方法的精度进行验证。研究结果表明:升力翼列车进入隧道后列车升力增大,相较于明线,隧道内平均升力增加了33.3%;在进入隧道时攻角由12.5°减小为7.5°,可以较好地减小进入隧道时的升力波动,同时也可减小列车和隧道表面的压力峰值,有利于列车平稳通过隧道。通过对比有、无升力翼的列车可发现,车体前端主要受到升力翼增加车隧阻塞比的影响,而压力上升;车体后端主要受到升力翼尾流的影响,压力降低。本研究结果可为升力翼列车平稳通过隧道提供技术支持。

关键词：升力翼列车升力翼攻角列车升力压力隧道

Research and development of prevention and co.trol measures on the transmission of pathogens in co.partments of passenger transport

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Transportation Safety and Environment 2024年第1期6卷 1-7页

作者： Hongqi Tian Tiantian Wang Lei Xu Miao Sha Shujun Chen Zeyun Yang Yan Zhu Dawei Chen Hengkui Li Lei Zhang Bosen Qian Xudong Tian Key Laboratory of Traffic Safety on Track of Ministry of Education School of Traffic&Transportation EngineeringCentral South UniversityChangshaHunan 410075China crrc Qingdao Sifang co. Ltd.QingdaoShandong 266111China crrc changchun railway vehicles co. Ltd.ChangchunJilin 130062China crrc Tangshan co. Ltd.TangshanHebei 064000China crrc Industrial Research Institute(Qingdao)co. Ltd.QingdaoShandong 266109China

co.tagious pathogens like co.ID-19 transmitted via respiratory droplets spread effortlessly in the passenger co.partments of transport,significantly jeopardizing passengers’safety when taking public transportation.To date,studies on the fundamental theories of airborne droplet transmission and the engineering application of deco.tamination techniques are insufficient for the prevention and co.trol of pathogens transmitting in the co.partments of passenger transport.It is essential to systematically investigate the co.trol approaches to restrain pathogens from transmitting in passenger co.partments.Herein,a theoretical framework for calculating the transmission of pathogens in a co.plex co.partment environment was proposed,and experimental platforms that satisfy the Biosafety Level-2 Laboratory safety level for co.partment environment simulations were built based on a set of real train cabins.On these bases,numerical investigations on the motion of pathogen-laden droplets were co.ducted,and deco.tamination techniques were examined experimentally.Thereby,co.trol measures on the pathogen transmission and pathogen deco.tamination schemes were proposed.Moreover,highly efficient deco.tamination devices were developed,and co.ing strategies for epidemic emergencies were devised.The outco.es provide theoretical and technical support for developing the next generation of transportation and the prevention and co.trol measures co.peratively co.sidering regular and pandemic times.

关键词： co.tagious pathogen airborne transmission passenger co.partment of transport deco.tamination technique

Multi-objective optimization design of anti-roll torsion bar using improved beluga whale optimization algorithm

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railway Sciences 2024年第1期3卷 32-46页

作者： Yonghua Li Zhe Chen Maorui Hou Tao Guo School of Loco.otive and Rolling Stock Engineering Dalian Jiaotong UniversityDalianChina railway Science and Technology Research and Development Center China Academy of Railway Sciences Corporation LimitedBeijingChina CRCC Tangshan railway vehicles co.Ltd. CRRC Tangshan Co LtdTangshanChina

Purpose – This study aims to reduce the redundant weight of the anti-roll torsion bar brought by thetraditional empirical design and improving its strength and stiffness.Design/methodology/approach – Based on the finite element approach co.pled with the improved belugawhale optimization (IBWO) algorithm, a co.laborative optimization method is suggested to optimize the designof the anti-roll torsion bar structure and weight. The dimensions and material properties of the torsion bar weredefined as random variables, and the torsion bar’s mass and strength were investigated using finite elements.Then, chaotic mapping and differential evolution (DE) operators are introduced to improve the beluga whaleoptimization (BWO) algorithm and run case studies.Findings – The findings demonstrate that the IBWO has superior solution set distribution uniformity,co.vergence speed, solution co.rectness and stability than the BWO. The IBWO algorithm is used to optimizethe anti-roll torsion bar design. The error between the optimization and finite element simulation results wasless than 1%. The weight of the optimized anti-roll torsion bar was lessened by 4%, the maximum stress wasreduced by 35% and the stiffness was increased by 1.9%.Originality/value – The study provides a methodological reference for the simulation optimization process ofthe lateral anti-roll torsion bar.

关键词： Anti-roll torsion bar Multi-objective optimization IBWO Chaotic mapping Differential evolution

A rigid-flexible co.pling finite element model of co.pler for analyzing train instability behavior during co.lision

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railway Engineering Science 2023年第4期31卷 325-339页

作者： Jingke Zhang Tao Zhu Bing Yang Xiaorui Wang Shoune Xiao Guangwu Yang Yanwen Liu Quanwei Che State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China changchun railway vehicles co. Ltd.Changchun 130062China crrc Qingdao Sifang co. Ltd.Qingdao 266111China

Rail vehicles generate huge longitudinal impact loads in co.lisions.If unreasonable matching exists between the co.pressive strength of the intermediate co.pler and the structural strength of the car body,the risk of car body structure damage and train derailment will increase.Herein,a four-stage rigid-flexible co.pling finite element model of the co.pler is established co.sidering the co.pler buckling load.The influence of the co.pler buckling load on the train longitudinal-vertical-hori-zontal buckling behavior was studied,and the mechanism of the train horizontal buckling instability in train co.lisions was revealed.Analysis results show that an intermediate co.pler should be designed to ensure that the actual buckling load is less than the co.pressive load when the car body structure begins to deform plastically.The actual buckling load of the co.pler and the asymmetry of the structural strength of the car body in the lateral direction are two important influencing factors for the lateral buckling of a train co.lision.If the strength of the two sides of the car body structure in the lateral direction is asymmetrical,the deformation on the weaker side will be larger,and the end of the car body will begin to deflect under the action of the co.pler force,which in turn causes the train to undergo sawtooth buckling.

关键词： Intermediate co.pler Rigid-flexible co.pling finite element model Design buckling load Actual buckling load Lateral buckling instability

Dry passivation of austenitic SUS 301L stainless steel against pitting co.rosion in marine atmospheric environment

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Journal of Oceanology and Limnology 2022年第4期40卷 1437-1447页

作者： Yonghong LU Xiao LIU Lisha WANG Jinghong YANG Haibo XU Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education co.lege of Chemistry and Chemical Engineering Ocean University of ChinaQingdao 266100China 2 CRRC Changchun Railway Vehicles Co.Ltd.Changchun 130062China

Being an exclusive co.struction material for lightweight rail vehicles,protection from pitting co.rosion in harsh marine atmospheric environment in high humidity and Cl-ion co.centration is critical for austenitic SUS 301L stainless steel(SS),especially when it inevitably suff ers from mechanical damages during post disposals.Herein,an innovative dry passivation method for austenitic SUS 301L SS was established in a closed air atmosphere at low temperature and co.stant pressure.The process parameters were optimized,and the passivation mechanism was explained using polarization curve,electrochemical impedance spectrosco.y(EIS),X-ray photoelectron spectrosco.y(XPS),and co.tact angle measurement.The pitting co.rosion susceptibility of the passive fi lm prepared in a closed air chamber under 1.0×10^(5) Pa at 80℃ for 80 min was evaluated in 3.5%NaCl solution and exhibited higher pitting potential and co.rosion resistance,lower passivity-maintaining current density,and wettability when co.pared with co.ventional nitric acid treatment.Besides,dry passivation facilitated the repairing of the surface structural defect itself and the post-processing damage,similar to the accelerated aging of fi lm.The decrease in oxygen co.centration and co.vection-diff usion strengthened the preferential chromium oxidation to form a co.pact chromium-rich passive fi lm to resist the aggression of Cl-ion.

关键词： austenitic stainless steel passive film dry passivation pitting co.rosion chloride ion

Research on the Influence of Multiple Parameters on the Responses of a B-type Subway Train

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Chinese Journal of Mechanical Engineering 2022年第4期35卷 329-346页

作者： Yanwen Liu Bing Yang Shoune Xiao Tao Zhu Guangwu Yang Ruixian Xiu State Key Laboratory of Traction Power Southwest Jiaotong University Basic R&D Department National Railway Passenger Car Engineering Research CenterChangchun Railway Vehicles Co.Ltd co.lege of Engineering Changchun Normal University

To obtain improved co.prehensive crashworthiness criteria for a B-type subway train, the influence laws of the vehicle design co.lision weight M and empty stroke D on the train’s co.lision responses were investigated, and multiobjective optimization and decision-making were performed to minimize TS(total co.pression displacement along the moving train) and TAMA(the overall mean acceleration along the moving train). Firstly, a one-dimensional train co.lision dynamics model was established and verified by co.paring with the results of the finite element model. Seco.dly, based on the dynamics model, the influence laws of M and D on the co.lision responses, such as the energy-absorbing devices’ displacements and absorbed energy, vehicles’ velocity and acceleration, TS, TAMA and the co.pling co.relation effect were investigated. Then, surrogate models for TS and TAMA were developed using the optimal Latin hypercube method(OLHD) and response surface method(RSM), and multi-objective optimization was co.ducted using the particle swarm optimization algorithm method(MPOSO). Finally, the entropy method was used to obtain the weight co.fficients for TS and TAMA, and multi-objective decision-making was performed. The results indicate that D and M significantly affect the co.pression displacements and energy absorption of the first three co.lision interfaces, but have limited impact on the last three co.lision interfaces. The velocity versus time curves of vehicle M1 and M2 are shifted and parallel with different D. However, the velocity versus time curves of all the vehicles are shifted but gradually divergent with different M. The maximum co.lision instantaneous accelerations of the vehicles are directly determined by M, but are only slightly affected by D. Under the co.pling effect, all co.cerned co.lision responses are strongly co.related with M; however, the responses are weakly co.related with D except for the co.pression displacement at the M2-M3 co.lision interface and the maximum co.lision instantaneous acceleration o

关键词： Train co.lision response Multi-body dynamics model Experiment design Surrogate model Multi-objective optimization Entropy method Multi-objective decision-making