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HIGH-SPEED VEHICLE-track VIBRATION ANALYSIS BASED ON SPATIALLY COUPLING MODEL UNDER EFFECT OF track irregularity

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HIGH-SPEED VEHICLE-TRACK VIBRATION ANALYSIS BASED ON SPATIAL...

Dynamic analysis of axle box bearings on the high-speed train caused by wheel-rail excitation

铁道工程新技术：第二届铁道工程关键技术国际学术会议

作者： Hongmei SHI Qiqi LI School of Mechanical and Electronic Control Engineering Beijing Jiaotong University Beijing 100044

＜正＞With the rapid development of high-speed railway,dynamic interaction between vehicles and track is *** irregularity is the major reason that causes all kinds of dynamic response of vehicle-track coupling *** analyze the vibration characteristics of High-speed vehicles in different speed,the vehicle-track spatially coupling dynamics model is established first. track random irregularity that generated by the Chinese mainline track spectrum in time domain is simulated as the *** dynamic response of high-speed vehicle components and track is obtained through the dynamic simulation by *** to the results,the velocity of train has much influence on the vibration property of rail and wheel sets than car *** results of dynamic simulation are of great significance for the vehicle vibration analysis and dynamic track irregularity estimation.

关键词： track irregularity vehicle-track spatially coupling system wheel/rail contract vibration response

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Applied Mathematics and Mechanics(English Edition) 2024年第3期45卷 441-460页

作者： Qiaoying MA Shaopu YANG Yongqiang LIU Baosen WANG Zechao LIU State Key Laboratory of Mechanical behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of Transportation Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of Mechanical Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China

To explore the impact of wheel-rail excitation on the dynamic performance of axle box bearings,a dynamic model of the high-speed train including axle box bearings is ***,the dynamic response characteristics of the axle box bearing are *** investigation focuses on the acceleration characteristics of bearing vibration under excitation of track irregularities and wheel *** addition,experiments on both normal and faulty bearings are conducted separately,and the correctness of the model and some conclusions are *** to the research,track irregularity is unfavorable for bearing fault detection based on resonance *** the same speed conditions,the acceleration peak of bearing is inversely proportional to the length of the wheel flat and directly proportional to its *** paper will contribute to a deeper understanding of the dynamic performance of axle box bearings.

关键词： high-speed train track irregularity wheel flat dynamic simulation

Assessment of the Influence of Tunnel Settlement on Operational Performance of Subway Vehicles

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Structural Durability & Health Monitoring 2024年第1期18卷 55-71页

作者： Gang Niu Guangwei Zhang Zhaoyang Jin Wei Zhang Xiang Liu China Communications Construction Rail Transit Subsidiary Beijing100000China China Communications Construction Strait Construction Investment Development Co. Ltd.Fuzhou350000China School of Civil Engineering Fujian University of TechnologyFuzhou350118China

In the realm of subway shield tunnel operations,the impact of tunnel settlement on the operational performance of subway vehicles is a crucial *** study introduces an advanced analytical model to investigate rail geometric deformations caused by settlement within a vehicle-track-tunnel coupled *** model integrates the geometric deformations of the track,attributed to settlement,as track irregularities.A novel“cyclic model”algorithm was employed to enhance computational efficiency without compromising on precision,a claim that was rigorously *** model’s capability extends to analyzing the time-history responses of vehicles traversing settlement-affected *** research primarily focuses on how settlement wavelength,amplitude,and vehicle speed influence operational *** findings indicate that an increase in settlement wavelength can improve vehicle performance,whereas a rise in amplitude can degrade *** study also establishes settlement thresholds,based on vehicle operation comfort and *** insights are pivotal for maintaining and enhancing the safety and efficiency of subway systems,providing a valuable framework for urban infrastructure management and long-term maintenance strategies in metropolitan transit systems.

关键词： Settlement running performance subway tunnel dynamic analysis track irregularity threshold

Analysis of dynamic stresses in ballasted railway track due to train passages at high speeds

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第6期23卷 443-457页

作者： Jing HU Xue-cheng BIAN Department of Civil Engineering Fuzhou UniversityFuzhou 350108China Department of Civil Engineering Zhejiang UniversityHangzhou 310058China MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang UniversityHangzhou 310058China

Repeated train passages bring detrimental effects on train operations,especially at high *** this study,a computational model consisting of moving train vehicles,track structure,and track foundation is used to investigate the stress distribution in the track substructure and underlying soil,particularly when the train speed approaches the critical speed via 2.5D finite element *** numerical model has been validated by in-situ test results from a ballasted high-speed *** computational results reveal that the substructure is shown to be effective in reducing the stresses transmitted to the ground;however,a simple Boussinesq approximation is proved to be inaccurate because it cannot properly take account of the effect of multi-layered substructures and train *** is acceptable to assume a simplified smooth track in the analysis model for determining the maximum stresses and displacements for a low-speed railway(≤100 km/h)but,for a high-speed one,the dynamic amplification effect of track irregularities must also be considered in subgrade *** of the stress paths revealed that the load speed and track irregularity increase the likelihood of failure for the subgrade;track irregularity can induce many times of principal stress rotations even under a simple single moving load.

关键词： Ballasted railway Stress analysis track irregularity Stress path High speed

Dynamic Performance of Straddle Monorail Curved Girder Bridge

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Computer Modeling in Engineering & Sciences 2022年第3期130卷 1669-1682页

作者： Yan Zhou Kai Zhang Feng Miao Pengfei Yang Tianjin Key Laboratory of Civil Structure Protection and Reinforcement Tianjin Chengjian UniversityTianjin300384China Tianjin Municipal Engineering Design&Research Institute Co. Ltd.Tianjin300051China Dalian University Dalian116622China

In this work,a monorail vehicle-bridge coupling(VBC)model capable of accurately considering curve alignment and superelevation is established based on curvilinear moving coordinate system,to study the VBC vibration of straddlemonorail curved girder bridge and the relevant factors influencing *** taking Chongqing Jiao Xin line as an example,the VBC program is compiled using Fortran,where the reliability of algorithm and program is verified by the results of Chongqing monorail ***,the effects of curve radius,vehicle speed,and track irregularity on the corresponding vehicle and bridge vibrations are compared and *** is observed that the test results of lateral vibration acceleration(LVA)and vertical vibration acceleration(VVA)of track beam,and LVA of vehicle,are consistent with the simulation *** to the track irregularity,vibration of track beam and vehicle increases ***,an increase in vehicle speed gradually increases the vibration of track beam and *** the curve radius(R)≤200 m,lateral and vertical vibrations of the track beam and vehicle decrease significantly with an increasing curve ***,when 200 mtrack beamand vehicle decreases slowly with an increasing curve radius,while the relevant vertical vibration remains ***,when R≥600 m,the lateral and vertical vibrations of the track beam and vehicle tend to be ***,the results presented here can provide a strong reference for the design,construction,and safety assessment of existing bridges.

关键词： Straddle monorail curved beam curve radius track irregularity vehicle-bridge coupling vibration

On the problem of the dynamical reactions of a rolling wheelset to real track irregularities

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Railway Engineering Science 2023年第1期31卷 1-19页

作者： Hans True Lasse Engbo Christiansen Andreas Lindhardt Plesner Andreas Lønstrup Ammitzbøll Bjørn Jerram Dahl DTU Compute Technical University of DenmarkRichard Petersens Plads Building 3242800Kgs.LyngbyDenmark

We investigate numerically the dynamical reactions of a moving wheelset model to real measured track *** background is to examine whether the dynamics are suitable as the input to the inverse problem:determine the true track geometry from measured wheelset dynamical *** is known that the method works well for the vertical position of the rails but the computed lateral position is often *** find that the lateral motion of the wheelset often may differ from the track *** cases are investigated closely but the reasons remain *** the wheelset dynamics reflect the larger(>4-6 mm)aperiodic track disturbances and single large disturbances quite well,this does not seem to be the case for general smaller or periodic track irregularities or sections behind single large *** resulting dynamics of a wheelset to lateral track irregularities are in general not sufficiently accurate to be used as the basis for a description of the track irregularities.

关键词： track monitoring Vehicle dynamical response Inverse problem Numerical analysis Estimate of errors track irregularity

A trailer car dynamics model considering brake rigging of a high-speed train and its application

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Railway Engineering Science 2023年第3期31卷 269-280页

作者： Zhiwei Wang Linchuan Yang Jiliang Mo Song Zhu Wenwei Jin School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031China CRRC Qishuyan Institute Co. LtdChangzhou 213011China

Brake systems are essential for the speed regulation or braking of a high-speed *** vehicle dynamic performance under braking condition is complex and directly affects the reliability and running *** reveal the vehicle dynamic behaviour in braking process,a comprehensive trailer car dynamics model(TCDM)considering brake systems is established in this *** dynamic interactions between the brake system and the other connected components are achieved using the brake disc-pad frictions,brake suspension systems,and wheel-rail *** force and motion transmission from the brake system to the wheel-rail interface is performed by the proposed TCDM excited by track *** addition,the validity of TCDM is verified by experimental test *** this basis,the dynamic behaviour of the coupled system is simulated and *** findings indicate that the braking force significantly affects vehicle dynamic behaviour including the wheel-rail forces,suspension forces,wheelset torsional vibration,*** dynamic interactions within the brake system are also significantly affected by the vehicle vibration due to track ***,the developed TCDM can be further employed to the dynamic assessment of such a coupled mechanical system under different braking conditions.

关键词： Brake system Disc-pad frictions Wheel-rail interactions track irregularity High-speed train

Multivariate Analyses for Finding Significant track Irregularities to Generate an Optimal track Maintenance Schedule

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American Journal of Operations Research 2022年第6期12卷 261-292页

作者： Mami Matsumoto Masashi Miwa Tatsuo Oyama Railway Technical Research Institute Hikari-Cho Kokubunji-Shi Tokyo Japan Tokyo Keizai University Minami-Cho Kokubunji-shi Tokyo Japan National Graduate Institute for Policy Studies Roppongi Minato-Ku Tokyo Japan

We first discuss the relationship between the optimal track maintenance scheduling model and an efficient detection method for abnormal track irregularities given by the longitudinal level irregularity displacement (LLID). The results of applying the cluster analysis technique to the sampling data showed that maintenance operation is required for approximately 10% of the total lots, and these lots were further classified into three groups according to the degree of maintenance need. To analyze the background factors for detecting abnormal LLID lots, a principal component analysis was performed;the results showed that the first principal component represents LLIDs from the viewpoints of the rail structure, equipment, and operating conditions. Binomial and ordinal logit regression models (LRMs) were used to quantitatively investigate the determinants of abnormal LLIDs. Binomial LRM was used to characterize the abnormal LLIDs, whereas ordinal LRM was used to distinguish the degree of influence of factors that are considered to have a significant impact on LLIDs.

关键词： Multivariate Analysis track Maintenance Scheduling track irregularity Longitudinal Level irregularity Displacement Cluster Analysis Principal Component Analysis Binomial Logit Regression Model Ordinal Logit Regression Model

Refined disturbance observer based prescribed performance fixed-time control of high-speed EMS trains with track irregularities

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High-Speed Railway 2023年第3期1卷 171-178页

作者： Yiran Xie Boyang Zhao Xiuming Yao School of Electronics and Information Engineering Beijing Jiaotong UniversityBeijing 100044China

High-speed Electromagnetic Suspension(EMS)train is continuously impacted by the irregularity of the track,which worsens the levitation performance of the *** this paper,a composite control scheme for the EMS is proposed to suppress track irregularities by integrating a Refined Disturbance Observer(RDO)and a Prescribed Performance Fixed-Time Controller(PPFTC).The RDO is designed to estimate precisely the track irregularities and lumped disturbances with uncertainties and exogenous disturbances in the suspension system,and reduce input chattering by applying to the disturbance compensation *** is designed to converge the suspension air gap error to equilibrium point with prescribed performance by completing error conversion,and solve the fast dynamic issue of *** the boundary of overshoot and steady-state is limited in the ranged prescribed.A theoretical analysis is conducted on the stability of the proposed control ***,the effectiveness and reasonability of the proposed composite anti-disturbance control scheme is verified by simulation results.

关键词： High-speed electromagnetic suspension train track irregularity Refined disturbance observer Prescribed performance Fixed-time control