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Analysis of temperature characteristics of high-speed train wheelset system under complex operating conditions

International Journal of Mechanical System Dynamics 2024年第3期4卷 331-345页

作者： Baosen Wang Yongqiang Liu Yingying Liao Yixuan Wang School of Mechanical Engineering Shijiazhuang Tiedao UniversityShijiazhuangChina Hebei Key Laboratory of Mechanical Power and Transmission Control Shijiazhuang Tiedao UniversityShijiazhuangChina School of Civil Engineering Shijiazhuang Tiedao UniversityShijiazhuangChina Taiyuan Vehicle depot Daqin Railway Co.Ltd.TaiyuanChina

With the rapid advancements in high-speed train technology,the importance of ensuring the safety of train operations has become ***,being a critical component of train bogies,have garnered significant attention for their role in maintaining safety *** the temperature of bearings to evaluate their motion state is a common practice in high-speed trains,emphasizing the need for further research into temperature *** this study,a dynamic model is developed for the bearing rotor system of high-speed *** considering the contact points between raceways and rolling elements,the power loss in the bearing is obtained and a transient temperature-field model of the system is *** relationship between node temperature and factors such as ambient temperature,train running speed,and load is illustrated,with a detailed presentation of the influence of bearing fault type and size on node *** analysis results reveal that the node temperature increases with higher values corresponding to those quantifiable factors and is most affected by rolling element ***,it is observed that the temperature rises rapidly in the initial stage and gradually flattens out over *** comparative analysis of temperature under different fault conditions shows that the node temperature is most affected by the rolling element *** and actual line temperature data are used to verify the validity of the *** comparison results show that the simulation aligns well with experimental and line *** transient temperature-field model of the bearing rotor system in high-speed trains can effectively simulate and predict the temperature change process of each node of the *** simulation results hold certain theoretical guiding significance for further research and practical applications in ensuring train operation safety.

关键词： high-speed train dynamic model transient temperature field bearing fault line data

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On the Polygonal Wear Evolution of Heavy-Haul locomotive Wheels due to Wheel/Rail Flexibility and Its Mitigation Measures

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Chinese Journal of Mechanical Engineering 2024年第1期37卷 40-61页

作者： Yunfan Yang Feifan Chai Pengfei Liu Liang Ling Kaiyun Wang Wanming Zhai State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong UniversityChengdu 610031China

Wheel polygonal wear can immensely worsen wheel/rail interactions and vibration performances of the train and track,and ultimately,lead to the shortening of service life of railway *** present,wheel/rail medium-or high-frequency frictional interactions are perceived as an essential reason of the high-order polygonal wear of railway wheels,which are potentially resulted by the flexible deformations of the train/track system or other external *** this work,the effect of wheel/rail flexibility on polygonal wear evolution of heavy-haul locomotive wheels is explored with aid of the long-term wheel polygonal wear evolution simulations,in which different flexible modeling of the heavy-haul wheel/rail coupled system is ***,the mitigation measures for the polygonal wear of heavy-haul locomotive wheels are *** results point out that the evolution of polygonal wear of heavy-haul locomotive wheels can be veritably simulated with consideration of the flexible effect of both wheelset and *** of mixed-line operation of heavy-haul trains and application of multicut wheel re-profiling can effectively reduce the development of wheel polygonal *** research can provide a deep-going understanding of polygonal wear evolution mechanism of heavy-haul locomotive wheels and its mitigation measures.

关键词： Heavy-haul locomotive Wheel polygonal wear Wheel/rail flexibility Long-term polygonal wear evolution Mitigation measures

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Evaluation of the mold-filling ability of alloy melt in squeeze casting

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Journal of University of Science and Technology Beijing 2006年第1期13卷 60-66页

作者： Haiying Zhang Shuming Xing Qinghua Zhang Jianbo Tan Wen Liu Semisolid Forming Research Center Beijing Jiaotong University Beijing 100044 China shijiazhuang locomotive depot Shijiazhuang 050000 China Department of Material and Engineering Hebei University of Science and Technology Shijiazhuang 050018 China

The mold-filling ability of alloy mclt in squceze casting process was evaluated by means of the maximum length of Archimedes spiral line. A theoretical evaluating model to predict the maximum filling length was built based on the flowing theory of the incompressible viscous fluid. It was proved by experiments and calculations that the mold-tilling pressure and velocity are prominent influencing factors on the mold-filling ability of alloy melt. The mold-filling ability increases with the increase of the mold-filling pressure and the decrease of the proper mold-filling velocity. Moreover, the pouring temperature relatively has less effect on the mold-filling ability under the experimental conditions. The maximum deviation of theoretical calculating values with experimental results is less than 15%. The model can quantitatively estimate the effect of every factor on the mold-filling ability.

关键词： squeeze casting process parameters mold-filling ability theoretical calculation experimental evaluation

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Analysis of the Temperature Characteristics of High-speed Train Bearings Based on a Dynamics Model and Thermal Network Method

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Chinese Journal of Mechanical Engineering 2022年第5期35卷 351-363页

作者： Baosen Wang Yongqiang Liu Bin Zhang Wenqing Huai School of Traffic and Transportation Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of Mechanical Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China Department of Electrical Engineering University of South CarolinaColumbia 29201USA Taiyuan Vehicle depot of Daqin Railway Co. Ltd.Taiyuan 030000China

High-speed trains often use temperature sensors to monitor the motion state of ***,the temperature of bearings can be affected by factors such as weather and ***,it is necessary to analyze in detail the relationship between the bearing temperature and influencing *** this study,a dynamics model of the axle box bearing of high-speed trains is *** model can obtain the contact force between the rollers and raceway and its change law when the bearing contains outer-ring,inner-ring,and rolling-element *** on the model,a thermal network method is introduced to study the temperature field distribution of the axle box bearings of high-speed *** this model,the heat generation,conduction,and dispersion of the isothermal nodes can be *** results show that the temperature of the contact point between the outer-ring raceway and rolling-elements is the *** relationships between the node temperature and the speed,fault type,and fault size are analyzed,finding that the higher the speed,the higher the node *** different fault types,the node temperature first increases and then decreases as the fault size *** effectiveness of the model is demonstrated using the actual temperature data of a high-speed *** study proposes a thermal network model that can predict the temperature of each component of the bearings on a high-speed train under various speed and fault conditions.

关键词： High-speed train Axle box bearing Temperature characteristics Thermal network method

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Characteristic analysis of mechanical thermal coupling model for bearing rotor system of high-speed train

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Applied Mathematics and Mechanics(English Edition) 2022年第9期43卷 1381-1398页

作者： Yongqiang LIU Baosen WANG Shaopu YANG Yingying LIAO Tao GUO School of Mechanical Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of Traffic and Transportation Shijiazhuang Tiedao UniversityShijiazhuang 050043China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of Civil Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China Tangshan locomotive and Rolling Stock Co. Ltd.China Railway Rolling Stock CorporationTangshan 064000Hebei ProvinceChina

Based on Newton’s second law and the thermal network method,a mechanical thermal coupling model of the bearing rotor system of high-speed trains is established to study the interaction between the bearing vibration and *** influence of lubrication on the vibration and temperature characteristics of the system is considered in the model,and the real-time relationship between them is built up by using the transient temperature field *** considering the lubrication,the bearing outer ring vibration acceleration and node temperature considering grease are lower,which shows the necessity of adding the lubrication *** corresponding experiments for characteristics of vibration and temperature of the model are respectively *** the envelope spectrum obtained from the simulation signal and the experimental signal,the frequency values corresponding to the peaks are close to the theoretical calculation results,and the error is very *** the three stages of the temperature characteristic experiment,the node temperature change of the simulation model is consistent with the *** good agreement between simulation and experiments proves the effectiveness of the *** studying the influence of the bearing angular and fault size on the system node temperature,as well as the change law of bearing lubrication characteristics and temperature,it is found that the worse the working condition is,the higher the temperature *** the ambient temperature is low,the viscosity of grease increases,and the oil film becomes thicker,which increases the sliding probability of the rolling element,thus affecting the normal operation of the bearing,which explains the phenomenon of frequent bearing faults of high-speed trains in the low-temperature area of Northeast *** analysis shows that faults often occur in the early stage of train operation in the low-temperature environment.

关键词： high-speed train coupling dynamic model thermal network method track irregularity(TI) low temperature

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A piecewise negative stiffness mechanism and its application in dynamic vibration absorber

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International Journal of Mechanical System Dynamics 2021年第2期1卷 173-181页

作者： Yan Hao Yongjun Shen Junfeng Wang Shaopu Yang Department of Mechanical Engineering Shijiazhuang Tiedao UniversityShijiazhuangChina Tianjin EMU&Railway Vehicles depot China Railway Beijing Group Co.Ltd.TianjinChina Bogie Technical Center CRRC Tangshan Co.LtdTangshanChina

A new type of piecewise negative stiffness(NS)mechanism is designed and the relationship between the force and displacement is *** first,the prototype of the piecewise NS mechanism is established,and the stiffness characteristic of this mechanism is ***,the piecewise NS mechanism is applied to dynamic vibration absorber(DVA)system to establish a dynamic model with the piecewise *** differential motion equations are derived according to Newton's law of *** approximate analytical solution and the amplitude frequency curve of the system with the piecewise NS are obtained by means of the averaging *** correctness of the analytical solution is proved by comparing with the numerical *** the end,the comparisons with two other traditional DVAs show that the system in this paper has better vibration reduction effect under the condition of harmonic excitation and random excitation.

关键词： amplitude-frequency curve dynamic vibration absorber piecewise negative stiffness vibration control

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Dynamic performance of heavy-haul combined train applying emergency braking on straight line

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Journal of Central South University 2017年第8期24卷 1898-1908页

作者：刘鹏飞王开云 School of Mechanical Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China

A heavy-haul train-track coupled model is developed. Taking the emergency braking of the 2×104 t combined train as example, the train longitudinal impulse, the coupler dynamic behaviors and wheel-rail interactions of vehicles distributing in the different positions are analyzed. The results indicate that under the coupler compressing forces, the couplers of middle locomotives may tilt to the free swing limits, which induces the unidirectional tilt of their connected wagon couplers. Consequently, the coupler longitudinal forces produce the lateral components, and then affect the wheel-rail dynamic interaction. The performance of the middle locomotive and their neighboring freight wagons deteriorate significantly, becoming the most dangerous parts in the combined train. The wagons disconnecting with the locomotives can basically keep their couplers to stabilize in the centering positions, even though the maximum coupler longitudinal force acts on it. And its corresponding running safety also has little changes.

关键词： heavy-haul train longitudinal impulse vehicle–track coupled dynamics emergency braking

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Dynamic performance of six-axle locomotive subjected to asymmetric brake shoe forces

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Journal of Central South University 2020年第9期27卷 2776-2791页

作者： LIU Peng-fei ZHANG Kai-long CAO Yun-qiang State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of Mechanical Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China

To research the influence of asymmetric brake shoe forces(ABSF)induced by braking failure on the dynamic performance of six-axle locomotive,the static equilibrium model of three-axle bogie and dynamic model for locomotive are *** coupling vibration equations of axle hung motor and wheelset are *** the air braking,the influence mechanism of ABSF on the wheel-rail asymmetric motion and force characteristics are *** can be found that if the ABSF is applied in the front wheelset,all the wheelsets move laterally in the same *** the ABSF occurs in the middle or rear one,other wheelsets may move laterally towards the opposite *** motion amplitude and direction of all wheelsets strictly depend on the resultant moment of suspension yawing moment and brake shoe asymmetric *** the asymmetric braking,the free lateral gap of axle-box could increase the wheelset motion amplitude,but could not change the moving *** both the straight line and curve,the ABSF may lead to wheelset misaligning motion,intensify the wheel-rail lateral dynamic interaction and deteriorate wheel-rail contact *** for the steering wheelsets,the asymmetric braking increases the wheelset attack angle significantly,which forms the worst braking condition.

关键词： locomotive brake shoe force dynamic performance asymmetric braking wheel-rail contact

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Fuzzy Fault Diagnosis of a Diesel Engine Non-start

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International Journal of Plant Engineering and Management 2009年第3期14卷 147-150页

作者： LIU Ke-ming YANG Wei-hong XU Guang-ming XU Wei-guo GA O Lei-fu School of Mechanical Engineering Liaoning Technical University Fuxin 123000 P. R. China Jinzhou locomotive depot Jinzhou 121001 P. R. China College of Science Liaoning Technical University Fuxin 123000 P. R. China

The diesel locomotive plays an important role in the field of transport, and the engine maintenance work is the prerequisite and gnarantee for the locomotive normal working. In this paper, we first establish the fault tree model of locomotive engine 16V240ZJ on the basis of engine non-start as the top event. Then we combines the fitzzy mathematics the- ory and fault tree analysis method for failure diagnosis of 16V240ZJ engine＇s abnormal start-up. We obtained the fuzzy probability curve and top events probability confidence interval by analyzing the fuzzy fault tree qualitatively and quantitatively. It provides a fuzzy analysis basis for solving the problem of 16V240ZJ engine＇s abnormal start-up.

关键词： diesel engine fuzzy fault tree diagnosis

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Research on Wheel Rail Wear for a 140 t Open Type Hot Metal Car

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Engineering（科研） 2020年第8期12卷 563-580页

作者： Bo Feng Sumei Jia Guosheng Feng HCIG Communication Investment Co. Ltd. Shijiazhuang China School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang China

To maintain the safety of an open-type hot-metal car and to reduce wheel-rail wear during transportation, simulation models of the main components of such car were built using Pro/E software and then tested. In particular, the Pro/E models were imported into ADAMS/Rail for assembly and then used to construct a complete hot-metal car dynamic model. locomotive wheel-rail attack angle, wheel-rail lateral force, and wear index were used as evaluation parameters during the simulation to analyze the effects of bogie parameter, rail parameter, and speed of the hot-metal car on wheel-rail wear. An improvement scheme for reducing wheel-rail wear was proposed based on the result of the dynamic simulation, wherein wheel-rail wear and curving performance were analyzed and compared. The simulation provided an important reference for evaluating and improving the dynamic performance of the hot-metal car. The applied effect showed that the improvement scheme is effective.

关键词： Hot-Metal Car ADAMS/Rail Dynamic Simulation Wheel and Rail Wear

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