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Physics-informed machine learning for identifying gradient-distributed plastic parameters of the S38C axle by nano-indentation 认领 引用 被引量：1
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作者 Siyu Li Lvfeng Jiang +4 位作者 Yanan Hu Jian Li Xu Zhang Qianhua Kan Guozheng Kang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第1期105-121,共17页
The S38C railway axle undergoes induction hardening,resulting in a gradient-distributed microstructure and mechanical properties.The accurate identification of gradient-distributed plastic parameters for the S38C axle... The S38C railway axle undergoes induction hardening,resulting in a gradient-distributed microstructure and mechanical properties.The accurate identification of gradient-distributed plastic parameters for the S38C axle remains a challenging task.To tackle this challenge,the present study proposes a novel approach for identifying the gradient-distributed plastic parameters for the S38C axle by integrating nano-indentation techniques with the machine learning method.Firstly,nano-indentation tests are conducted along the radial direction of the S38C axle to obtain the gradient-distributed load-displacement curves,nano-hardness,and elastic modulus.Subsequently,the dimensionless analysis is performed to obtain the representative stress,strain,and yield stress from load-displacement curves.These parameters are then incorporated into the machine learning method as physical information to identify the gradient-distributed plastic parameters of the S38C axle.The results indicate that the proposed method based on the physics-informed neural network and multi-fidelity neural network successfully identifies the gradient-distributed plastic parameters of the S38C axles and demonstrates superior prediction accuracy and generalization compared with the purely data-driven machine learning method. 展开更多
关键词 S38C axle Nanoindentation Physics-informed machine learning Gradient structure Plastic parameters
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Mechanical-thermal coupling model and fatigue life analysis of axle-box bearings of high-speed train 认领 引用
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作者 Weixu Zhao Yongqiang Liu +2 位作者 Baosen Wang Shaopu Yang Yingying Liao 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2026年第1期548-562,共15页
The axle box bearings of high-speed trains often operate in extremely harsh environments,bearing loads from different directions.Long-term operation and frequent changes in working conditions can easily lead to axle b... The axle box bearings of high-speed trains often operate in extremely harsh environments,bearing loads from different directions.Long-term operation and frequent changes in working conditions can easily lead to axle box bearing failures.Therefore,it is extremely important to study the mechanism of axle box bearings.Firstly,the medium of thermal deformation establishes a coupling relationship between the system dynamics model and the thermal grid model,and then obtains the thermal force coupling model of the high-speed train axle box bearing.The coupling model is validated from the perspectives of system dynamics response and temperature response,proving its effectiveness in system dynamics response and temperature characteristic response.Comparing the coupling model with the dynamics model,it is found that thermal deformation complicates the dynamic re-sponse.Finally,using the Lundberg-Palmgren(L-P)bearing fatigue calculation method and damage accumu-lation theory,the bearing fatigue life is calculated,and it is found that thermal deformation deteriorates the bearing operating environment,reducing the bearing fatigue life.Finally,by comparing the bearing fatigue life under different working conditions,it is concluded that the faster the vehicle speed,the greater the load,and the smaller the initial radial clearance of the bearing,the fatigue life of the bearing is reduced.The shorter the lifespan. 展开更多
关键词 High-speed train Axle box bearing Mechanical-thermal coupling model Fatigue life
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Stochastic assessment of residual fatigue life of railway axles considering relevant critical factors 认领 引用
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作者 Dušan Tichoň Tomáš Vojtek +6 位作者 Pavol Dlhý Pavel Pokorný Luboš Náhlík Alfonso Fernández-Canteli Rostislav Fajkoš Ondřej Peter Pavel Hutař 《Railway Engineering Science》 EI 2026年第1期1-24,共24页
Statistical distribution of residual fatigue life(RFL)of railway axles under given loading was computed using the Monte Carlo method by considering random variation of the selected input parameters.Experimental data f... Statistical distribution of residual fatigue life(RFL)of railway axles under given loading was computed using the Monte Carlo method by considering random variation of the selected input parameters.Experimental data for the EA4T railway axle steel,the loading spectrum,the press fit loading and the residual stress induced by surface hardening were considered in the crack propagation simulations.Usually,the material properties measured by tensile tests are considered to be the most informative source of material data.Under fatigue loading,however,the crack growth rates near the threshold are the most critical data.Two important influencing factors on these crack growth rates are presented:first,the air humidity and,second,the near-surface residual stress.The typical variation of these parameters in operation may change the RFL by one or two orders of magnitude.Experimentally obtained crack growth thresholds and residual stress profiles are highly affected by the used methodology.Therefore,the obtained input data may be located anywhere within a large scatter,while the experimenters are completely unaware of it.This can lead to dangerously non-conservative situations,e.g.when the thresholds are measured in a laboratory under humid air conditions and then applied to predictions of RFLs of axles operated in winter in low air humidity.This is significant for the topic of inspection interval optimisation.The results of experiments done on real 1:1 railway axles were close to the most frequent value found in the histogram of the numerically computed RFLs. 展开更多
关键词 Residual fatigue life Railway axles Fatigue crack Growth threshold Air humidity Monte Carlo method
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Cooperative traction control of multi-motor electric locomotives considering axle load transfer 认领 引用
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作者 Liran Li Simo Chen +2 位作者 Kan Liu Leiting Zhao Xiaoming Liao 《Railway Sciences》 2026年第4期566-580,共15页
Purpose-This study aims to propose a cooperative adhesion control method for multi-motor electric locomotives that explicitly considers axle load transfer(ALT).The method is intended to optimize the output torque of e... Purpose-This study aims to propose a cooperative adhesion control method for multi-motor electric locomotives that explicitly considers axle load transfer(ALT).The method is intended to optimize the output torque of each motor,maximize the utilization of available wheel-rail adhesion within the total torque command,mitigate wheel skidding and sliding phenomena,and achieve optimal torque allocation across all axles.Design/methodology/approach-An advanced cooperative maximum adhesion tracking control strategy is developed using Model Predictive Control(MPC).First,a comprehensive multi-agent dynamic model of the locomotive traction system is constructed based on Newton’s second law,which incorporates longitudinal train dynamics,individual axle rotational dynamics,nonlinear wheel-rail adhesion characteristics,and dynamic ALTinduced load redistribution.Then,a novel MPC-based multi-axle co-optimization method is presented.This controller calculates the optimal output torque through real-time iteration based on a reference slip speed,ensuring coordinated torque allocation under strict physical constraints imposed by the traction control unit.Findings-Simulation studies conducted under dry,wet,and mixed rail surface conditions indicate that the proposed MPC system effectively compensates for ALT.The results demonstrate that explicitly embedding ALT into the control framework allows the system to adaptively redistribute motor torques according to real-time axle loads.This guarantees stable slip regulation and significantly improves overall traction performance and power distribution compared to conventional strategies that ignore ALT.Originality/value-This study introduces a novel cooperative adhesion tracking control scheme that uniquely integrates axle load transfer into a multi-agent MPC for multi-motor electric locomotives-a complex configuration rarely addressed in previous papers.This approach resolves the critical issues of torque imbalance,lightly loaded axle slip,and heavily loaded axle under-utilization,offering significant theoretical and practical value,especially under variable and non-uniform rail conditions. 展开更多
关键词 Cooperative control Multi-motor electric locomotive Axle load transfer Model predictive control Paper type Research article
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Hot axle box detectors hot wheel detectors:towards a harmonised,digital and international safety framework 认领 引用
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作者 Joaquin Botella José-Manuel Cabral 《Railway Sciences》 2026年第2期153-185,共33页
Purpose-This paper presents an integrated technical and economic assessment of hot axle box detectors(HABD)and hot wheel detectors(HWD)important components of derailment prevention strategies,whose role extends beyond... Purpose-This paper presents an integrated technical and economic assessment of hot axle box detectors(HABD)and hot wheel detectors(HWD)important components of derailment prevention strategies,whose role extends beyond auxiliary monitoring to become cornerstones of derailment prevention and operational resilience.Building upon the International Union of Railways(UIC)Network Monitor Phases 1-3,the study synthesises international benchmarking evidence,cost-benefit analysis and operational practice to provide a coherent framework for decision-making,deployment and harmonisation.Design/methodology/approach-The methodology combines three layers:(1)international benchmarking of national rules,detector spacing and alarm thresholds across Europe,North America,Asia and Australia;(2)a cost-benefit model based on avoided accidents,fatalities and disruption,tested through sensitivity analyses of detector density and false-alarm rates;and(3)operational doctrines covering alarm logic,reliability,availability,maintainability and safety requirements,operations control centre integration and lifecycle maintenance.The findings are aligned with European Union Agency for Railways guidance,UIC International Railway Solution(IRS)70729 and lessons from Demonstration of Railway Infrastructure Reliability and Sustainable Railway projects.Findings-Findings confirm that HABD/HWD systems provide significant safety and economic value when integrated into operational rulebooks,maintenance workflows and digital platforms.Multi-sensor and AIenabled detectors reduce false positives and enhance early detection,while international harmonisation efforts(e.g.IRS 70729 and EHMS)support cross-border interoperability.This study provides evidence-based guidance for risk-based deployment and lifecycle optimisation within modern railway safety frameworks.Originality/value-This paper provides a comprehensive international synthesis that connects benchmarking,cost-benefit and operational safety frameworks into a structured doctrine for HABD/HWD deployment.It provides infrastructure managers and railway undertakings with evidence-based guidance on risk-based siting,lifecycle optimisation and international harmonisation.The work also contributes to the forthcoming UIC IRS,positioning HABD/HWD as globally relevant digital safety assets within the broader agenda of railway innovation,digitalisation and socio-economic resilience. 展开更多
关键词 Hot axle box detection Hot wheel detection Railway safety Predictive maintenance Digitalisation International harmonisation
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Dynamic modeling and simulation of irregular faults in axle box bearings of high-speed trains 认领 引用
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作者 Xiaohui GU Yajia WANG +2 位作者 Pengfei LIU Zechao LIU Shaopu YANG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2025年第10期1883-1902,共20页
Axle box bearings are critical components of high-speed trains.Localized defects,such as pitting and spalling,on raceways or rollers pose significant threats to the operational safety of railway vehicles.In this work,... Axle box bearings are critical components of high-speed trains.Localized defects,such as pitting and spalling,on raceways or rollers pose significant threats to the operational safety of railway vehicles.In this work,a novel bearing-flexible axle boxvehicle coupling model is established to explore the vibration characteristics of axle box bearings with irregular localized defects.First,based on the contact and kinematic relationship between rollers and raceways,the three-dimensional(3D)bearing force elements are analyzed and formulated.Second,the established model and a flexible axle box are integrated into the vehicle,and the responses of the normal and faulty bearings under the combined excitations of wheel roughness and track irregularities are simulated.Third,the simulation results are verified through a rolling-vibrating test bench for full-scale wheelsets of high-speed trains.The comparisons of the fault-induced repetitive transients in the time-domain and the fault characteristic frequencies in the envelope spectra demonstrate the efficiency of the proposed model.Finally,based on the flexible axle box model,a sensitivity analysis of the accelerometer placements to the bearing faults is carried out,and the optimal one is identified based on both the time-domain and frequency-domain signal-to-noise ratios(SNRs)for engineering applications. 展开更多
关键词 axle box bearing irregular fault track irregularity flexible axle box accelerometer placement selection
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Damage Tolerance Assessment of Heavy-Duty Freight Railway Axles with Artificial Defects 认领 引用 被引量：1
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作者 Hai Zhao Ding Liao +4 位作者 Jiewei Gao Shunpeng Zhu Ligen Liu Jing Han Shantong Li 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2025年第2期394-406,共13页
Heavy-duty freight railway axles are no less important than those of passenger trains,owing to the potentially catastrophic results caused by the derailment of trains carrying hazardous substances.Intrinsic and extrin... Heavy-duty freight railway axles are no less important than those of passenger trains,owing to the potentially catastrophic results caused by the derailment of trains carrying hazardous substances.Intrinsic and extrinsic imperfections challenge classical design theories built based on the safe life concept,and damage tolerance assessment becomes vital for the safety and reliability of long-term serviced railway axles,as pits and scratches are common defects for heavy-duty railway axles.In this work,four-point rotating bending fatigue tests of AAR-CM railway axle steel specimens with semicircular and circumferential groove notches are conducted.The fatigue limit of the semicircular notched specimens was evaluated based on fracture mechanics theory,in which non-conservative results are obtained by the El Haddad model and the S–N curves of circumferential groove notched specimens are correlated by the theory of critical distance(TCD). 展开更多
关键词 Heavy-duty railway axle Damage tolerance Notch K-T diagram Theory of critical distance
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An estimating methodology for the load of train axle box bearings 认领 引用
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作者 Zhenqian Li Maoru Chi +1 位作者 Wubin Cai Yabo Zhou 《High-Speed Railway》 CSCD 2025年第4期267-280,共14页
Axle box bearings serve as crucial components within the transmission system of high-speed trains.Their failure can directly impact the operational safety of these trains.Accurately determining the dynamic load experi... Axle box bearings serve as crucial components within the transmission system of high-speed trains.Their failure can directly impact the operational safety of these trains.Accurately determining the dynamic load experienced by bearings during the operation of high-speed trains can provide valuable boundary inputs for the study of bearing fatigue life and service performance,thereby holding significant engineering implications.In this study,we propose a high-speed train axle box bearing load estimation method(FMCC-DKF).This method is founded on the Kalman filtering technique of the Maximum Correntropy Criterion(MCC)and employs dummy measurement technology to enhance the stability of estimated loads.We develop a kernel size update algorithm to address the challenges associated with obtaining the key parameter,kernel size of MCC.Comparative analysis of the vertical and lateral loads of the axle box bearing obtained using FMCC-DKF,DKF,and AMCC-DKF,under both measurement noise-free and non-Gaussian noise conditions,is conducted to demonstrate the superiority of the proposed estimation method.The results indicate that the proposed FMCC-DKF method exhibits high estimation accuracy under both measurement noise-free and non-Gaussian noise interference,and maintains its high estimation accuracy despite changes in train speed.The proposed load estimation method demonstrates reliable performance within the low-frequency domain below 70 Hz. 展开更多
关键词 Axle box bearing load Load estimation Maximum correntropy criterion Non-Gaussian noise High-speed train
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Research on fatigue evaluation method of high-speed train axle based on axle box acceleration 认领 引用
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作者 Wenjing Wang Yiming Zeng +1 位作者 Ruiguo Yan Yiyue Chen 《High-Speed Railway》 2023年第4期233-240,共8页
As a key safety component of the high-speed train, fatigue fracture of the axle would lead to major accidents such as derailment or overturning. The complexity of the axle dynamic stress test seriously enhances the di... As a key safety component of the high-speed train, fatigue fracture of the axle would lead to major accidents such as derailment or overturning. The complexity of the axle dynamic stress test seriously enhances the difficulty of axle fatigue damage analysis. In this paper, the dynamic stress test of the high-speed train axle was carried out,the axle box acceleration was monitored on-track during the test, and the relationship between the axle stress spectrum and acceleration was analyzed on-track. The results show that the relationships between the axle equivalent stresses and the Root Mean Square(RMS) values of the axle box vertical acceleration and lateral acceleration exhibit a strong joint probability density distribution. The concept of the virtual surface density of wheel-rail contact is also proposed to realize the purpose of using axle box acceleration to deduce axle equivalent force. The results quantify the relationship between axle box acceleration and axle equivalent force, provide a new method for predicting the axle damage using the acceleration RMS values, and open up a new approach for structural health monitoring of high-speed train axles. 展开更多
关键词 High-speed train axles Axle-box acceleration Dynamic stress of wheelset axle Fatigue damage Wheel-rail contact virtual surface density
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A clip-on composite sensor based packaging design method for fiber Bragg grating axle counter 认领 引用
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作者 Mengyao Zhao Xueyun Cao +2 位作者 Longsheng Wang Yang Peng Tao Wang 《Railway Sciences》 2025年第5期647-665,共19页
Purpose–To address the encapsulation challenge of fiber Bragg grating(FBG)sensors in complex railway environments,this paper designs a clip-on composite sensor enabling installation-friendly deployment and long-term ... Purpose–To address the encapsulation challenge of fiber Bragg grating(FBG)sensors in complex railway environments,this paper designs a clip-on composite sensor enabling installation-friendly deployment and long-term axle counting system monitoring.Design/methodology/approach–Wheel–rail mechanical behavior was simulated via finite element analysis(FEA)to determine optimal sensor placement.A clip-on composite sensor was subsequently engineered.Stress transduction efficacy was validated through FEA quantification of stress responses at the axle counter location.Findings–The proposed FBG axle counter integrates temperature compensation and anti-detachment monitoring as well as advantages such as simplified installation with minimal maintenance and sustained operational reliability.It effectively transmits stress,yielding a measured strain of 39μe under static loading conditions without sensitivity-enhancing elements.Originality/value–This study performs FEA of wheel-rail stress distribution and engineers the dual-slot composite sensor,FEAwas conducted to quantify the stress magnitude at the axle sensor position of the dual-slot composite sensor.Additionally,FEA was performed on sensors with different structural configurations,including adjustments to the axle sensor position,number of slots and axle position.The results confirmed that the designed composite sensor exhibits superior stress transfer characteristics. 展开更多
关键词 Fiber Bragg grating Axle counting Finite element Sensor Wheel-rail forces
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Lightweight Design of Front Axle Structure of a Certain Type of Automobile 认领 引用
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作者 Chuan qi LI Jian ZOU +2 位作者 Bing Ll Yiming LEI Mingshuo ZHANG 《Mechanical Engineering Science》 2025年第1期26-32,共7页
In this paper,the front axle of a certain model is taken as the research object,and the stress and deformation of the frontaxle under three typical working conditions are analyzed by finite element technology.Based on... In this paper,the front axle of a certain model is taken as the research object,and the stress and deformation of the frontaxle under three typical working conditions are analyzed by finite element technology.Based on the simulation results,the 3D model of the front axle was optimized,and the finite element analysis of the optimized structure of the front axle under three typical working conditions was carried out to verify the correctness of the model.Finally,the fatigue tool module of ANSYS Workbench was used to analyze the fatigue life of the front axle under the optimized emergency conditions,and the feasibility of the model was verified.The analysis data shows that the design of the front axle components still has a lot of potential for lightweighting,and the weight of the front axle can be reduced by 6.73%through optimization,and the performance of the front axle can also meet the needs of use.The research conclusionhas a certain reference value for the lightweight design of automobile front axle. 展开更多
关键词 automobile front axle structural optimization Fatigue life
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DAMAGE TOLERANCE ANALYSIS ON HOLLOW AXLES OF HIGH SPEED MOTOR TRAINS 认领 引用 被引量：2
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作者 ZHOU Suxia XIE Jilong +1 位作者 YANG Guangxue XIAO Nan 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS 2008年第5期8-12,共5页
According to the rules of UIC515-3,the service loads of the axles are defined,which include some different loads cases as follows:the static loads;the impact loads resulted from running through the rail joints and une... According to the rules of UIC515-3,the service loads of the axles are defined,which include some different loads cases as follows:the static loads;the impact loads resulted from running through the rail joints and unevenness rails;the loads through curves and from braking.Through the calculating and analysis,the stress distribution of the hollow axles is obtained for 200 km/h high speed motor trains used in China.At the same time,the fatigue crack growth of hollow axles is studied,and the initial surface cracks of 2 mm depth caused by hard objects strike or the other causes are discussed.On the basis of the linear elastic fracture mechanics theory,the stress intensity factor of the crack of the geometry transition outside the wheel seat is also studied.Associated with fatigue crack propagation equation and the corresponding crack propagation threshold,the crack propagation characteristics under different shapes are calculated.Then the running distances are educed with different shapes propagating to the critical length,and the estimation of the residual lives about hollow axles which are the reference values of examine and repair limit of the hollow axle is given. 展开更多
关键词 Motor wains Hollow railway axles Fatigue crack Axle stress Damage tolerance Loads
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Experimental and numerical study on fretting wear and fatigue of full-scale railway axles 认领 引用 被引量：17
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作者 Lang Zou Dongfang Zeng +3 位作者 Yabo Li Kai Yang Liantao Lu Caiqin Yuan 《Railway Engineering Science》 EI 2020年第4期365-381,共17页
This study investigated the fretting wear and fatigue of full-scale railway axles.Fatigue tests were conducted on full-scale railway axles,and the fretting wear and fretting fatigue in the fretted zone of the railway ... This study investigated the fretting wear and fatigue of full-scale railway axles.Fatigue tests were conducted on full-scale railway axles,and the fretting wear and fretting fatigue in the fretted zone of the railway axles were analysed.Three-dimensional finite element models were established based on the experimental results.Then,multi-axial fatigue parameters and a linear elastic fracture mechanics-based approach were used to investigate the fretting fatigue crack initiation and propagation,respectively,in which the role of the fretting wear was taken into account.The experimental and simulated results showed that the fretted zone could be divided into zones I-III according to the surface damage morphologies.Fretting wear alleviated the stress concentration near the wheel seat edge and resulted in a new stress concentration near the worn/unworn boundary in zone II,which greatly promoted the fretting crack initiation at the inner side of the fretted zone.Meanwhile,the stress concentration also increased the equivalent stress intensity factor range DKeq below the mating surface,and thus promoted the propagation of fretting fatigue crack.Based on these findings,the effect of the stress redistribution resulting from fretting wear is suggested to be taken into account when evaluating the fretting fatigue in railway axles. 展开更多
关键词 Railway axle Fretting wear Fretting fatigue Crack initiation Crack propagation Finite element
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Analysis of Quenching Stresses in 35CrMo Axle 认领 引用 被引量：4
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作者 龚海 WU Yunxin +1 位作者 FENG Xiaolei LI Yihua 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2016年第3期630-635,共6页
By using the finite element method （FEM）, we comprehensively analyzed the fields of temperature, organization, and stress in 35CrMo train axles during the quenching process is conducted, and experimentally studied t... By using the finite element method （FEM）, we comprehensively analyzed the fields of temperature, organization, and stress in 35CrMo train axles during the quenching process is conducted, and experimentally studied the formation and evolution of inner stresses in axles during the quenching process. The results show that in the quenching process, stresses on the axle surface change from tensile to compressive gradually, while stresses in the axle core change from compressive to tensile gradually. Heat stresses and the amount of martensitic transformation are all increased with the increase of cooling rate. As a result, the maximmn instantaneous stresses in the axle are increased greatly when the cooling rate is increased with brine quenching. Large instantaneous tensile stress in the axle core with brine quenching is very likely to cause quench cracking and should be avoided. 展开更多
关键词 35CrMo axle quenching residual stress FEM X-ray diffraction
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Effect of Nb addition on microstructure and mechanical properties of 25CrNiMoV(DZ2)steel for high-speed railway axles 认领 引用 被引量：2
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作者 Jin-wen Zhang Yan-guang Cao +2 位作者 Cheng-guo Zhang Zhao-dong Li Wen-xian Wang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2022年第5期802-809,共8页
The microstructure,precipitates and properties of 25CrNiMoV(DZ2)steel for high-speed railway axles with different Nb contents were investigated by means of optical microscopy,scanning electron microscopy,electron back... The microstructure,precipitates and properties of 25CrNiMoV(DZ2)steel for high-speed railway axles with different Nb contents were investigated by means of optical microscopy,scanning electron microscopy,electron back-scattering diffraction,transmission electron microscopy and physicochemical phase analysis.The results show that the grain size of the original austenite of the test steels decreases from 20.5 to 14.2 and 10.8μm after adding 0.026 and 0.039 wt.%Nb to a 25CrNiMoV steel,respectively.Moreover,the block width of the tempered martensite in the test steels is refined from 1.91 to 1.72 and 1.60µm,respectively.MC-type precipitates in 25CrNiMoV steel are mainly VC,while(Nb,V)C gradually precipitates when Nb is microalloyed,and the amount of precipitates increases with increasing Nb content.Through strengthening mechanism analysis,it is found that grain refinement strengthening is the primary way to increase the strength.The improvement in the yield strength with increasing Nb content is attributed to a significant increase in precipitation strengthening,grain refinement strengthening and dislocation strengthening. 展开更多
关键词 High-speed railway axle steel Nb microalloying Precipitate Strengthening mechanism
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Vibration of Axle Box from Wheel Diameter Difference in Vehicle 认领 引用 被引量：3
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作者 CHENG Daolai XU Lei SUN Xiaojie 《Journal of Shanghai Jiaotong university(Science)》 EI 2020年第4期509-518,共10页
The wheel diameter difference would worsen the dynamic performance and affect the safety of the rail vehicle.Therefore,it is necessary to detect wheel diameter difference while the train is operating.However,several e... The wheel diameter difference would worsen the dynamic performance and affect the safety of the rail vehicle.Therefore,it is necessary to detect wheel diameter difference while the train is operating.However,several existing detection methods can’t accurately detect and diagnose the wheel diameter difference under highspeed running environment.In this study,a new method of detecting wheel diameter difference was proposed for high speed rail vehicle.The wheel diameter difference would be diagnosed by the amplitude and frequency of vibration impact on the axle box.Firstly,the dynamic model with varying wheel diameters was established in SIMPACK,and LMA tread was used in high-speed rail vehicles.Then,the simulation results of rail vehicle dynamic performance were compared under different wheel diameter differences.After that,the relationship between axle box vibration and wheel diameter difference was used to demonstrate the feasibility of this detection technology.Finally,comparing and analyzing the simulation results of vibration obtained by matching treads with different wheel diameters,it shows that by increasing the wheel diameter difference,the longitudinal and lateral impacts on axle boxes increase asymmetrically,and the amplitude and the frequency become more evident.Therefore,this paper presents a technical scheme of online measuring wheel diameter difference by monitoring the vibration of the axle box. 展开更多
关键词 wheel diameter difference axle box dynamic simulation vibration characteristics
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Analysis and Optimization on Factors Affecting Forming Quality of Half Axle Gears Warm Precision Forging 认领 引用 被引量：2
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作者 WANG Menghan CHEN Xihou ZHOU Jie 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS 2010年第1期110-114,共5页
Half axle gears is produced by precision forging popularly because of the advantages in minimum machining allowances, lower material consumption and good service properties. But the forming quality of precision forgin... Half axle gears is produced by precision forging popularly because of the advantages in minimum machining allowances, lower material consumption and good service properties. But the forming quality of precision forging is difficult to control. Many simulations and analysis of precision forging process were taken by previous researchers. But no concrete method is proposed to evaluate and optimize the forming quality of half axel gears. The primary purpose of this work is improving the forming quality of half axel gears by analyzing and optimizing the affected factors of forming quality. The enclosed-die warm forging process of half axle gears was developed, and a new type of die-set used on double action hydraulic press was brought forward. The main influential factors of precision forming quality were analyzed after the forming process had been simulated by using finite element method（FEM）. These factors include die structure, web thickness and web position. A method used to evaluate the forming quality was established, which investigated the maximal forming load, the metal filling rate and the material damage factor. The FEM simulations of half axle gears precision forging were evaluated by this method. The results show that the best forming quality can be achieved when the punches were added with bosses, the web located at the middle plant of the gear, and the web thickness was 30 percent of the inner hole diameter. Verification experiments taking the above optimized parameters were performed on a 7.8 MN double action hydraulic press. The trial products were formed well. And their geometric precision meets the demand. The verification result shows that the optimization of the influential factors, according to the simulations and the evaluation method, can improve the forming quality. The new structure of precision forging die-set and the new evaluation method guarantee a high forming quality ofhalfaxel gears. 展开更多
关键词 warm precision forging half axle gears forming quality die structure web
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Establishment of the thermo-mechanical coupling model of axle box bearings with track irregularity excitation and analysis of its temperature characteristics 认领 引用 被引量：1
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作者 Min WANG Shaopu YANG +2 位作者 Yongqiang LIU Yanhong CHEN Kai ZHANG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2024年第11期1965-1986,共22页
As an important component of the running gear of high-speed trains,axle box bearings can cause lubricating grease failure and damage to bearing components under continuous high-temperature operation,which will affect ... As an important component of the running gear of high-speed trains,axle box bearings can cause lubricating grease failure and damage to bearing components under continuous high-temperature operation,which will affect the normal operation of highspeed trains.Therefore,bearing temperature is one of the key parameters to be monitored in the online monitoring system for trains.Based on the thermal network method,this paper establishes a thermal network model for the axle box bearing,considering the radial thermal deformation of the double-row tapered roller bearing components caused by the oil film characteristics and the temperature variations of the lubricating grease.A thermo-mechanical coupling model for the grease-lubricated double-row tapered roller axle box bearing of high-speed trains with track irregularity excitation is established.The correctness of the model is verified using the test bench data,and the temperature of the bearing at different rotational speeds,loads,fault sizes,and ambient temperatures are investigated. 展开更多
关键词 axle box bearing thermal network method temperature rotational speed
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Simulation Research on Stress Intensity Factors of Different Crack Aspect Ratios on Hollow Axles 认领 引用 被引量：2
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作者 ZHOU Suxia XIE Jilong 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS 2009年第5期766-771,共6页
Because of the wicked service environment of the high speed train,it is possible that the hollow axle of the train may encounter the foreign object damage and form a sharp notch.Under the fatigue loading a crack can i... Because of the wicked service environment of the high speed train,it is possible that the hollow axle of the train may encounter the foreign object damage and form a sharp notch.Under the fatigue loading a crack can initiate from the notch and propagate to failure.It is noted that the stress intensity factor is the control parameter of the crack propagating,for the purpose of getting the more exact propagation characteristics,the stress intensity factor is studied mainly.The service loads of hollow axles are defined,and the stress distribution of hollow axles is obtained according to the load spectrum.The semi-ellipse crack configuration is defined with three parameters:the aspect ratio,the relative depth and the relative location along the crack front.Quarter point 20-node isoparametric degenerate singular elements are used for the region near the crack tip.The finite element model of crack extension of hollow axle is created,and the crack front is dispersed which can realize orthogonal extension.Based on this the stress intensity factors of crack front were calculated,and the distribution rules of the stress intensity factors of different initial crack shapes are obtained.The conclusions are compared with that of the analytic method and they agree with each other very well,and the calculating results show that there is a close relationship between the stress intensity factor and the initial crack shape.For a round crack the stress intensity factor at the surface point increases faster than the one at the center point with the crock propagation.However,for a narrow crack,the results are in contrast with that of a round one.So,all the cracks with different shapes propagate toward to a similar shape,and they grow at this shape to end.The study may contribute to the crack propagate characteristics research. 展开更多
关键词 hollow axle surface crack propagation stress intensity factor finite element
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DEVELOPMENT OF MATERIAL USED FOR AVIATION APPARATUS AXLE JOURNALS 认领 引用 被引量：1
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作者 Wu Enxi, Li Shen, Qian Chongliang and Zou ZhiqiangState Key Laboratory for Powder Metallurgy, Central South University of Technology, Changsha 410083, P. R. China 《中国有色金属学会会刊：英文版》 1998年第2期19-24,共6页
DEVELOPMENTOFMATERIALUSEDFORAVIATIONAPPARATUSAXLEJOURNALS①WuEnxi，LiShen，QianChongliangandZouZhiqiangStateKeyLaboratoryforPowd...
关键词 Co25W alloy axle journals consumableelectrode melting wiredrawing agehardening
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