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Friction 2024年第1期12卷 74-94页

作者： Jiabao YIN Chun LU Jiliang MO School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031China Technology and Equipment of Rail Transit Operation and Maintenance Key Laboratory of Sichuan Province Chengdu 610031China

A comprehensive modeling strategy for studying the thermomechanical tribological behaviors is proposed in this *** wear degradation considering the influence of temperature(T)is predicted by Archard wear model with the help of the UMESHMOTION subroutine and arbitrary Lagrangian–Eulerian(ALE)remeshing *** the proposed method,the thermomechanical tribological behaviors of railway vehicle disc brake system composed of forged steel brake disc and Cu-based powder metallurgy(PM)friction block are studied *** effectiveness of the proposed methodology is validated by experimental test on a self-designed scaled brake test bench from the perspectives of interface temperature,wear degradation,friction noise and vibration,and contact status *** work can provide an effective way for the investigation of thermomechanical tribological behaviors in the engineering field.

关键词： tribological behaviors thermomechanical field wear prediction finite element simulation disc brake system railway vehicle

RESEARCH AND DEVELOPMENT OF VIRTUAL PROTOTYPE OF RUNNING GEARS FOR railway vehicle

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Chinese Journal of Mechanical Engineering 2008年第1期21卷 36-41页

作者： ZOU Yisheng DING Guofu ZHANG Weihua XU Mingheng HE Yong College of Mechanical Engineering Southwest Jiaotong University Chengdu 610031 China Traction Power State Key Laboratory Southwest Jiaotong University Chengdu 610031 China

Virtual prototype is an important idea to resolve design problems of railway vehicle. A different development method, which is based on national product and autonomous development, and would like to reflect the specialty of railway vehicle development in China, is presented. According to the developing process of railway vehicle, the research contents and developing method are pointed out. The integration between CAD and performance analysis software on dynamics and strength is mainly considered. In CAD environment, the properties for dynamics computing are extracted directly from the model and exported with model. This method can avoid data losing caused by model rebuilding in CAE software, and increase the direct dependence of product CAD. Then the vehicle model with properties will be used for real-time dynamics and kinematics analysis and simulation. Therefore, the strength of the parts can be analyzed. The results of dynamics and strength analysis will be fed back to optimize the design model. All operations are dispatched by a control platform, and all data are managed according to the principle of PDM. Testing results show this method is correct.

关键词： Virtual prototype railway vehicle Property extraction Dynamics analysis Strength analysis

NONLINEAR OSCILLATIONS AND CHAOS IN A railway vehicle SYSTEM

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Chinese Journal of Mechanical Engineering 1998年第3期11卷 68-75页

作者： Zeng Jing National Traction Power Laboratory, Southwest Jiaotong University Southwest Jiaotong Univ Chengdu China

The study of nonlinear oscillations and chaos of a railway freight car is undertaken. The vehicle is considered as a multiple rigid body system with 9 degrees of freedom. The vehicle forward speed is taken as the control parameter of the system. Hopf bifurcation point, limit cycles, quasiperiodic and chaotic motions of the system are computed by use of numerical methods. The identification of periodic, quasiperiodic and chaotic motions of the system is carried out by using the methods of phase plane portrait and Poincare map. Numerical results show that chaotic motion appears via the route of quasiperiodicity when the vehicle runs over a certain speed.

关键词： railway vehicle Vibration Bifurcation Chaos

Evaluation of power regeneration in primary suspension for a railway vehicle

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Frontiers of Mechanical Engineering 2020年第2期15卷 265-278页

作者： Ruichen WANG Zhiwei WANG Institute of railway Research University of HuddersfieldHuddersfield HD13DHUK State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China

To improve the fuel economy of rail vehicles,this study presents the feasibility of using power regenerating dampers(PRDs)in the primary suspension systems of railway vehicles and evaluates the potential and recoverable power that can be *** are configured as hydraulic electromagnetic-based railway primary vertical dampers and evaluated in parallel and series modes(with and without a viscous damper).Hydraulic configuration converts the linear behavior of the track into a unidirectional rotation of the generator,and the electromagnetic configuration provides a controllable damping force to the primary suspension *** several case studies,generic railway vehicle primary suspension systems that are configured to include a PRD in the two configuration modes are modeled using computer *** simulations are performed on measured tracks with typical irregularities for a generic UK passenger *** performance of the modified vehicle is evaluated with respect to key performance indicators,including regenerated power,ride comfort,and running *** indicate that PRDs can simultaneously replace conventional primary vertical dampers,regenerate power,and exhibit desirable dynamic performance.A peak power efficiency of 79.87%is theoretically obtained in series mode on a top-quality German Intercity Express track(Track 270)at a vehicle speed of 160 mile/h(~257 km/h).

关键词： railway vehicle primary damper power regeneration ride comfort running safety

Fusion of Model-Based and Data Driven Based Fault Diagnostic Methods for railway vehicle Suspension

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Journal of Intelligent Learning Systems and Applications 2020年第3期12卷 51-81页

作者： Abdulai Ayirebi Ankrah James Kuria Kimotho Onesmus Mutuku Muvengei Department of Mechanical Engineering PAUSTI Nairobi Kenya Department of Mechanical Engineering JKUAT Nairobi Kenya

Transportation of freight and passengers by train is one of the oldest types of transport, and has now taken root in most of the developing countries especially in Africa. Recently, with the advent and development of high-speed trains, continuous monitoring of the railway vehicle suspension is of significant importance. For this reason, railway vehicles should be monitored continuously to avoid catastrophic events, ensure comfort, safety, and also improved performance while reducing life cycle costs. The suspension system is a very important part of the railway vehicle which supports the car-body and the bogie, isolates the forces generated by the track unevenness at the wheels and also controls the attitude of the car-body with respect to the track surface for ride comfort. Its reliability is directly related to the vehicle safety. The railway vehicle suspension often develops faults;worn springs and dampers in the primary and secondary suspension. To avoid a complete system failure, early detection of fault in the suspension of trains is of high importance. The main contribution of the research work is the prediction of faulty regimes of a railway vehicle suspension based on a hybrid model. The hybrid model framework is in four folds;first, modeling of vehicle suspension system to generate vertical acceleration of the railway vehicle, parameter estimation or identification was performed to obtain the nominal parameter values of the vehicle suspension system based on the measured data in the second fold, furthermore, a supervised machine learning model was built to predict faulty and healthy state of the suspension system components (damage scenarios) based on support vector machine (SVM) and lastly, the development of a new SVM model with the damage scenarios to predict faults on the test data. The level of degradation at which the spring and damp

关键词： railway vehicle Suspension System Hybird Model Fault Detection Support Vector Machine

Modeling and simulation of railway vehicle vertical dynamic behavior by considering the effect of passenger-carbody coupling vibration

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International Journal of Modeling, Simulation, and Scientific Computing 2019年第5期10卷 58-81页

作者： Yuewei Yu Leilei Zhao Changcheng Zhou School of Transportation and vehicle Engineering Shandong University of Technology ZiboP.R.China

In order to reflect the vertical random vibration characteristics of railway vehicles more truly and effectively,this paper regards the human body as a single-degree-of-freedom system attached to the bottom of the carriage,and establishes a vertical dynamic model of railway vehicles by considering the influence of the coupling vibration effect between the passenger and the car *** correctness of the model is verified by the real vehicle ***,the influence of the passengers on the vertical vibration characteristics of railway vehicles is analyzed,and the influence of the railway vehicle vibration on the vertical vibration characteristics of passengers is discussed in this *** research made in this paper can provide an effective model reference for the analysis of the vertical random vibration characteristics of railway vehicles and passengers,and for the optimization design of the suspension system parameters.

关键词： railway vehicle passenger-carbody coupling vibration car body elastic vibration vertical dynamic modeling and simulation

Lateral dynamic features of a railway vehicle

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Lateral dynamic features of a railway vehicle

Prediction Study on Anti-Slide Control of railway vehicle Based on RBF Neural Networks

第十五届全国非线性振动暨第十二届全国非线性动力学和运动稳定性学术会议

作者：高学军 Hans True LI Ying-hui State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology DTU Compute The Technical University of Denmark Traction Power State Key Laboratory Southwest Jiaotong University School of Mechanics and Engineering Southwest Jiaotong University

The lateral dynamic features of a railway vehicle are investigated using two similar wheel/rail contact models:the Vermeulen-Johnson and the Shen-Hedrick-Elkins *** symmetric/asymmetric bifurcation behaviour and chaotic motions of the railway vehicle are investigated in great detail by varying the speed and using the’resultant bifurcation diagram’*** is found that multiple solution branches exist and they can lead to more steady states in the dynamic behaviour of the railway *** coexistence of multiple steady states can lead to jumps in the amplitude of oscillations,resulting in problems for safe operation of the ***,it should be avoided in everyday ***,the creation of multiple solution branches suggests that the critical speed of a vehicle should be determined from a comprehensive analysis of the various kinds of possible excitations and numerous tests.

关键词： Solution branch railway vehicle symmetry/asymmetry bifurcation coexistence

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Prediction Study on Anti-Slide Control of Railway Vehicle Ba...

Application and Verification of Describing Function Method in Solving the Hunting Limit Cycles for railway vehicle

2012 International Conference on Solid State Devices and Materials Science(SSDMS 2012)

作者： Lijun Yang Jimin Zhang College of Automotive Engineering Tongji University railway &Urban Mass Transit Research Institute Tongji University

While railway vehicle braking, Anti-slide control system will detect operating status of each wheel-sets e.g. speed difference and deceleration etc. Once the detected value on some wheel-set is over pre-defined threshold, brake effort on such wheel-set will be adjusted automatically to avoid blocking. Such method takes effect on guarantee safety operation of vehicle and avoid wheel-set flatness, however it cannot adapt itself to the rail adhesion variation. While wheel-sets slide, the operating status is chaotic time series with certain law, and can be predicted with the law and experiment data in certain time. The predicted values can be used as the input reference signals of vehicle anti-slide control system, to judge and control the slide status of wheel-sets. In this article, the RBF neural networks is taken to predict wheel-set slide status in multi-step with weight vector adjusted based on online self-adaptive algorithm, and the center & normalizing parameters of active function of the hidden unit of RBF neural networks’ hidden layer computed with K-means clustering algorithm. With multi-step prediction simulation, the predicted signal with appropriate precision can be used by anti-slide system to trace actively and adjust wheel-set slide tendency, so as to adapt to wheel-rail adhesion variation and reduce the risk of wheel-set blocking.

关键词： railway vehicle Brake anti-slide control RBF neural network K-means clustering algorithm Multi-step prediction

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Application and Verification of Describing Function Method i...

Impact vibration behavior of railway vehicles:a state-of-the-art overview

The 2011 International Conference on Mechanical Materials and Manufacturing Engineering(ICMMME 2011)

作者： Hong Chunlei Geng Yue Hu Yongsheng School of Automotive Engineering Tongji University Institute of railway & Urban Mass Transit Research Tongji University

It is presented to solve the hunting limit cycles of railway system with multiple degrees of freedom and strongly nonlinear factors by describing function method(DFM). A nonlinear railway vehicle model with several dry friction factors is developed, and the 16 nonlinear transcendental equations of it are deduced using DFM. The modal characteristics of the hunting limit cycle for the vehicle model are obtained by the software programmed to solve complicated equation set. To verify the accuracy of describing function method, the hunting limit cycles of the model are simulated in time domain, and the results from these two methods have good consistence. This shows that the limit cycles of nonlinear rail vehicle systems with strongly nonlinear factors can be solved with high accuracy and efficiency by DFM, which of value in practical engineering application.

关键词： describing function method numerical integration nonlinear railway vehicle hunting limit cycle

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Acta Mechanica Sinica 2021年第8期37卷 1193-1221,I0003页

作者： Lin Jing Kaiyun Wang Wanming Zhai State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China

Excessive vibrations of railway vehicles induced by dynamic impact loadings have a significant impact on train operating safety and stability;however,due to the complexity and diversity of railway lines and service environment,they are extremely difficult to eliminate.A comprehensive overview of recent studies on the impact vibration behavior of railway vehicles was given in this ***,the sources of impact excitations were categorized in terms of wheel-rail contact irregularity,aerodynamic loads,and longitudinal impulses by train traction/*** the main research approaches of vehicle impact vibration were briefly introduced in theoretical,experimental,and simulation ***,the impact vibration response characteristics of railway vehicles were categorized and examined in detail to various impact excitation ***,some attempts of using the railway vehicle vibration to detect track defects and the possible mitigation measures were outlined.

关键词： Impact excitation Vibration characteristics railway vehicle Utilization and mitigation