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Mesh stiffness evaluation of an internal spur gear pair with tooth profile shift

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Science China(Technological Sciences) 2016年第9期59卷 1328-1339页

作者： CHEN ZaiGang ZHAI WanMing SHAO YiMin wang kaiyun State Key Laboratory of Traction Power Southwest Jiaotong University State Key Laboratory of Mechanical Transmission Chongqing University

Tooth profile shift will change the thickness of gear teeth and a part of geometrical parameters of a gear pair, thus influencing its mesh stiffness and consequently the dynamic performances. In this paper, an analytical mesh stiffness calculation model for an internal gear pair in mesh considering the tooth profile shift is developed based on the potential energy principle. Geometrical representations of the tooth profile shift are firstly derived, and then fitted into the analytical tooth stiffness model of gears. This model could supply a convenient way for mesh stiffness calculation of profile shifted spur gears. Then, simulation studies are conducted based on the developed model to demonstrate the effects of tooth profile shift coefficient on the tooth compliances and the mesh stiffness of the internal spur gear pair. The results show that tooth profile shift has an obvious influence on the mean value, amplitude variation and phase of the mesh stiffness, from which it can be predicted that the dynamic response of an internal gear transmission system will be affected by the tooth profile shift.

关键词： mesh stiffness tooth profile shift internal gear gear transmission tooth compliance

Dynamic performance of vehicle in high-speed freight EMU equipped with four double-axle bogies

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Science China(Technological Sciences) 2021年第2期64卷 387-399页

作者： ZHANG WeiLi CHEN ZaiGang wang kaiyun wang JiaXin ZHAI WanMing State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China CRRC Tangshan Co. Ltd.Tangshan 063000China

Size and weight limitations mean that ordinary railway vehicles with two double-axle bogies cannot deliver some extremely heavy cargo and ***,a newly designed high-speed freight electric multiple unit(EMU)equipped with two bogie groups each with two double-axle bogies connected by a transition frame is an alternative means of transporting heavy products because of its greater load ***,because it is still in the design stage,its dynamic performance is yet to be researched,something that is urgently required because of the more-complicated structure and more-intensive wheel-rail interactions than those of traditional high-speed railway ***,to reveal the dynamic performance,this study establishes a three-dimensional dynamic model of a trailer vehicle in a high-speed freight EMU equipped with four double-axle bogies based on the classical theory of vehicle-track coupled *** this dynamic model,the vertical,horizontal,rolling,pitching,and yaw motions of the major components excited by random irregularities in the track geometry are considered *** results indicate that the derailment coefficient and stability index of this vehicle are both at excellent levels for the simulated *** wheel unloading ratio appears to be larger but still within the safety range when the vehicle runs in a straight line,but it is close to or can even exceed the limit value when the vehicle runs at 400 km/h on a specified curved line.

关键词： high-speed freight train bogie group transition frame track irregularities dynamic performance

Surface wear evolution of traction motor bearings in vibration environment of a locomotive during operation

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Science China(Technological Sciences) 2022年第4期65卷 920-931页

作者： LIU YuQing CHEN ZaiGang wang kaiyun ZHAI WanMing State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China

Wear is a major cause of bearing failure,however,compared with other impact failures,smooth wear is often neglected because of its slow *** a locomotive,under the effect of the intensified wheel-rail interaction and gear mesh,the surface wear can increase the radial clearances of motor bearings,trigger abnormal vibration and noise,and adversely affect the efficiency and safety of the traction *** this study,considering the mechanical structure of the traction motor,a locomotive-track spatially coupled dynamics model with traction power transmissions(LTMM)is adopted to provide accurate dynamic loads and obtain the dynamic responses of the *** the perspective of contact stress and relative skidding at the roller-race interface,the causes and evolution of motor bearings surface wear are *** results indicate that the wear of inner races of motor bearings is *** outer races of the driving/non-driving end bearings(DB or NDB)are worn in the loaded/main loadbearing *** increasing surface wear can increase the internal dynamic forces(e.g.,the centrifugal force of rotor and unbalanced magnetic pull)induced by the instantaneous eccentricity of the rotor,intensify the interactions between the roller and races,and deteriorate the vibrations of the traction motor and its neighboring components in the *** addition,the effects of the friction coefficient at the roller-race interface and track random irregularity are *** study offers a theoretical basis in service life prediction and design of the motor bearings.

关键词： wear rolling bearing traction motor railway vehicle dynamics

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Effect of the drive system on locomotive dynamic characteristics using different dynamics models

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Science China(Technological Sciences) 2019年第2期62卷 308-320页

作者： ZHANG Tao CHEN ZaiGang ZHAI WanMing wang kaiyun wang Hong Train and Track Research Institute State Key Laboratory of Traction Power Southwest Jiaotong University School of Mechatronic Engineering Lanzhou Jiaotong University State Key Laboratory of Mechanical Transmission Chongqing University

Based on the theory of vehicle-track coupled dynamics and gear system dynamics, a locomotive-track coupled spatial dynamics model is established by considering the dynamic effects of the gear transmission system. The vibration responses of a locomotive's major components are then simulated using three locomotive-track models, namely the proposed dynamics model with the gear transmissions, a locomotive-track coupled dynamics model that considers the traction motor, and the classical Zhai's model. The locomotive dynamic responses of the three models are extracted and compared to reveal discrepancies between them so as to explore the dynamic effects of the power transmission system and clarify potential applications of these models. The results indicate that the dynamic effects of the gear transmissions have a negligible influence on the lateral vibrations of the locomotive components. However, they have obvious effects on the vertical and longitudinal vibrations of the wheelset and the traction motor. Another advantage of the locomotive dynamics model that considers the dynamic effects of the gear transmissions is that the dynamic performance of the drive system can be assessed in the vehicle vibration environment. This study provides theoretical references that can assist researchers in choosing the most appropriate locomotive dynamics model according to their specific research purpose.

关键词： gear transmission dynamic responses time-varying mesh stiffness wheel-rail contact axle load transfer

Numerical study of wheel–rail adhesion performance of new-concept high-speed trains with aerodynamic wings

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第8期24卷 673-691页

作者： Yang CHEN Lin JING Tian LI Liang LING kaiyun wang State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610011China

Wheel–rail adhesion is a complex tribological problem of wheel–rail rolling contact and is closely related to the operational safety of high-speed trains.A new design concept of high-speed trains was recently proposed with an expectation of a reduction of equivalent weight and total energy consumption by installing aerodynamic wings(aero-wings)on the roof,but it was accompanied by the disadvantage of deteriorating wheel–rail adhesion *** this study,a comprehensive multibody dynamics(MBD)model of the high-speed train with predesigned aero-wings is established using the commercial software SIMPACK,in which the real aerodynamic characteristics of the train are taken into *** available adhesion and adhesion margin are employed to evaluate the wheel–rail adhesion *** influences of aero-wing lift,train speed,and contact conditions on the wheel–rail adhesion level are *** results show that the load transfer caused by the action of aerodynamic load and braking torque was the main reason for the inconsistent adhesion condition of four *** influences of aero-wing lift and train speed on the wheel–rail adhesion performance are coupled;the available adhesion of both motor car and trailer is negatively correlated with aero-wing lift and train speed under all contact conditions,while the variation law of adhesion margin with train speed shows differences under different contact *** the wheel–rail interface was polluted by a‘third-body medium’such as water and oil,the wheel–rail adhesion performance was dramatically reduced and the wheelset tended to reach adhesion saturation and ***,track irregularity had little effect on the adhesion performance and could be ignored to save calculation *** results are of positive significance for reducing the wheel idling or sliding phenomenon and to ensure the safe operation of high-speed trains with aero-wings.

关键词： High-speed train Wheel–rail adhesion Aerodynamic wing Multi-body dynamics(MBD)

Improved Dynamics Model of Locomotive Traction Motor with Elasticity of Rotor Shaft and Supporting Bearings

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Chinese Journal of Mechanical Engineering 2022年第5期35卷 333-350页

作者： Yuqing Liu Zaigang Chen Jieyu Ning kaiyun wang Wanming Zhai State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China

The locomotive traction motor is described as a rotor-bearing system coupling the kinetic equations of the traction shaft and its support bearings with the determination of their elastic deformations in this *** the effect of excitations induced by the dynamic rotor eccentric distance and time-varying mesh stiffness,the elastic structure deformations of the shaft and support bearings are formulated in the vibration environment of the *** addition,the nonlinear contact forces between the components of the rolling bearing,the lubricating oil film,and radial clearance are comprehensively considered in this *** results indicate that the elastic deformations of the shaft and bearings can change the dynamic responses of the traction motor and its support *** are large differences between the ranges of the rotor motion calculated by the rigid and the flexible traction motor models when the intensified wheel-rail interaction is *** the increase of the rotor eccentricity,the results underscore the role of the elasticity of traction shaft and support bearings in dynamic researches of the traction *** critical value of the initial eccentric distance for the rub-impact phenomenon decreases from 1.23 mm to 1.15 mm considering the flexible effect of the shaft and *** dynamics model of the traction motor can provide more accurate and reasonable simulation results for correlational dynamic researches.

关键词： Traction motor Bearing Gear mesh Vehicle-track coupled dynamics

Dynamic analysis of traction motor in a locomotive considering surface waviness on races of a motor bearing

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Railway Engineering Science 2021年第4期29卷 379-393页

作者： Yuqing Liu Zaigang Chen Wei Li kaiyun wang State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China Motor Technology Department CRRC Yongji Motor Co.Ltd.Xi’an 710018China

The traction motor is the power source of the *** the surface waviness occurs on the races of the motor bearing,it will cause abnormal vibration and noise,accelerate fatigue and wear,and seriously affect the stability and safety of the traction power *** this paper,an excitation model coupling the time-varying displacement and contact stiffness excitations is adopted to investigate the effect of the surface waviness of the motor bearing on the traction motor under the excitation from the locomotive-track coupled *** detailed mechanical power transmission path and the internal/external excitations(e.g.,wheel–rail interaction,gear mesh,and internal interactions of the rolling bearing)of the locomotive are comprehensively considered to provide accurate dynamic loads for the traction *** of the wavenumber and amplitude of the surface waviness on the traction motor and its neighbor components of the locomotive are *** results indicate that controlling the amplitude of the waviness and avoiding the wavenumber being an integer multiple of the number of the rollers are helpful for reducing the abnormal vibration and noise of the traction motor.

关键词： Rolling bearing Traction motor Waviness Vibration responses Vehicle-track coupled dynamics

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

Train post‑derailment behaviours and containment methods:a review

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Railway Engineering Science 2024年第1期32卷 59-80页

作者： Zhao Tang Yuwei Hu Shuangbu wang Liang Ling Jianjun Zhang kaiyun wang State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China Institute of Smart City and Intelligent Transportation Southwest Jiaotong UniversityChengdu 610031China National Centre for Computer Animation Bournemouth UniversityDorsetUK

Railway accidents,particularly serious derailments,can lead to catastrophic ***,it is essential to prevent derailment escalation to reduce the likelihood of severe *** post-derailment behaviours and containment methods play a critical role in preventing derailment escalation and providing passive safety protection and accident prevention in the event of a ***,despite the increasing attention on this field from academia and industry in recent years,there is a lack of systematic exploration and summarization of emerging applications and containment methods in train post-derailment *** this reason,this paper presents a comprehensive review of existing studies on train post-derailment behaviours,encompassing various topics such as post-derailment contact-impact models,dynamic modelling and simulation techniques,and the primary factors influencing post-derailment ***,this review introduces and elucidates substitute guidance mechanisms(SGMs),which serve as railway-specific passive safety protection and accident prevention *** various types of SGMs are depicted,and their ongoing developments and applications are explored in *** review additionally points out several unresolved challenges including the adverse effects of SGMs,and proposes future research directions to advance the theoretical understanding and practical application of train post-derailment behaviours and containment *** review seeks to be a valuable reference for railway industry professionals in preventing catastrophic derailment consequences through post-derailment containment methods.

关键词： Railway passive safety Railway accident prevention Post-derailment behaviours Substitute guidance mechanisms(SGMs) Contact-impact model