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International Conference on Artificial Intelligence and Autonomous Transportation, AIAT 2024

作者： Zhou, Zichao Liu, Yongqiang Guo, Tao Wang, Tiecheng Huo, Wenbiao State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China CRRC TANGSHAN CO. LTD. Tangshan063000 China

ISBN: (纸本)9789819639687

To address the issue of high-order polygonal wear in high-speed trains operating at 300 km/h, this paper investigates the influence of bogie modal vibration on the initiation and progression of such wear phenomena. The model simulation incorporates the modal vibrations of both the frame and the wheelset, while also accounting for non-Hertzian contact and track irregularity within a long-term iterative wear model, thereby enhancing its alignment with real-world operational conditions. The main conclusions are: The vibration frequency of the wheel-rail contact normal force, influenced by running speed and sleeper spacing, plays a key role in the initiation of polygonal wear. The fourth-order bending resonance of the wheelset is the primary cause of the 20th-order polygon wear and its rapid development. Suspension parameters have a significant impact on the wear index, and proper adjustment of these parameters can effectively slow the progression of polygonal wear. The findings of this paper hold theoretical value and practical significance in understanding the formation and progression mechanisms of polygonal wear, as well as in developing effective measures for its mitigation. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Railroads

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Contact Analysis Between Rollers and Raceway of Axle Box Bearing Under Multi-source Fault 2nd

Contact Analysis Between Rollers and Raceway of Axle Box Bea...

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2nd International Conference of mechanical system Dynamics, ICMSD 2023

作者： Ma, Qiaoying Yang, Shaopu Liu, Yongqiang School of Transportation Shijiazhuang Tiedao University Shijiazhuang050043 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China

ISBN: (纸本)9789819980475

The axle box bearing is highly nonlinear and affected by external excitation factors during the service process, such as the running environment of the vehicle and wheel-rail excitations. Based on the coupling dynamics model of a high-speed train and axle box bearing, wheel tread damage and bearing outer ring fault were introduced in this paper. On this basis, the contact force between the roller and raceway of the bearing in the presence of multi-source faults was analyzed. In addition, the simulation of the vehicle running in tangent-line and curve-line conditions was carried out, and the evolution law of bearing contact force was further revealed through analysis. Through research, it is found that the curve-line running conditions have a significant impact on the bearing contact force. The following conclusions can be drawn from the analysis: If the wheel is normal, faulty bearings are more affected when running in a tangent-line, while normal bearings are more affected when running in a curve-line. The maximum difference between the tangent and curve conditions occurs in normal bearing of the longitudinal direction. If the wheel is defective, the distribution of contact force in curve-line running is close, with peak values of 251.77 kN. Meanwhile, the RMS of the fault bearing essentially stays the same in comparison to the normal bearing, so the vibration caused by a bearing fault is relatively weak when compared to the excitation caused by a wheel flat. When running in a curve, the contact force of the normal bearing in the longitudinal direction increases by a factor of about 74.69, with the largest growth range. The smaller the radius of the curve, the greater the influence of the contact force, and also the larger the fluctuation of the contact force between the roller and raceway, so that the probability of bearing fatigue damage greatly increases. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Railroads

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Research on Automatic Modeling Method for Railway Linear structures

Research on Automatic Modeling Method for Railway Linear Str...

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2023 International Conference on Remote Sensing, Mapping, and Geographic systems, RSMG 2023

作者： Sun, Xiaohao Nie, Liangtao School of Transportation Shijiazhuang Tiedao University Shijiazhuang China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University School of Transportation Shijiazhuang China

ISBN: (纸本)9781510668898

The key point and difficulty in realizing the rapid modeling of railway line 3D scenes is the automatic modeling technology of railway line entity model. Parametric modeling of linear structures is the committed step to realize automatic modeling of railway line structure. According to the characteristics of linear structures in line structure, this paper proposes an automatic modeling method based on lofting modeling for railway line 3D scenes. First, construct the section template library of the line structure. Call the template according to certain rules. Then, through the lofting procedures, the automatic modeling of the linear structure is realized under the parameter drive. Finally, by developing applications driven control parameter values, automated modeling of railway linear structures was completed. Compared with the traditional 3D modeling methods, the modeling method of lofting can realize the automatic modeling of linear structures in long strip railway line more quickly. © 2023 SPIE.

关键词： 3D modeling

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Effects of cavitation on vortex-induced vibration of a flexible circular cylinder simulated by fluid-structure interaction method

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Journal of Hydrodynamics 2022年第3期34卷 499-509页

作者： Zhi-jian Xiao Shi-hao Yang Cao Yu Zhen Zhang Lei Sun Jiang Lai Yan-ping Huang Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing100190China Nuclear Power Institute of China Chengdu610041China Beijing Electro-mechanical Engineering Institute Beijing100074China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang050043China

To investigate the effects of the cavitation on the vortex-induced vibration,the flow and the vibration characteristics of a flexible circular cylinder in the non-cavitating and cavitating flows at Re=200 are simulated using a fluid-structure interaction(FSI)solver,developed in the OpenFOAM *** accuracy of the fluid-structure interaction solver is verified using the benchmark *** a freely vibrating circular cylinder,the characteristics of the vortex-induced vibration are determined at different frequency *** frequency lock-in is observed in both the cavitating flow and the non-cavitating flow,and the lock-in frequency range is larger in the cavitating flow with a smaller vibration *** the lock-in frequency range,due to the reduction of the fluid forces and the resonance effects at the dominant frequency,the vibration amplitude is decreased in the cavitating flow,as compared to the non-cavitating ***,the low-density vapor and the cavitation collapse weaken the constraints of the flow and the stability of the shedding vortices,respectively,making the flow around the circular cylinder more sensitive to the structural ***,the lock-in frequency range is larger in the cavitating flow.

关键词： Fluid-structure interaction(FSI) cavitation lock-in frequency vortex-induced vibrations OpenFOAM

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Predictive fatigue crack growth law of high-strength steels

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Journal of Materials Science & Technology 2022年第5期100卷 46-50页

作者： H.F.Li P.Zhang B.Wang Z.F.Zhang Laboratory of Fatigue and Fracture for Materials Shi-changxu Innovation Center for Advanced MaterialsChinese Academy of SciencesInstitute of Metal ResearchShenyang 110016China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China

The fatigue resistance of metallic materials is generally attributed to both strength and ***,these properties are mutually exclusive in most *** theories like Paris’law only provide some data correlation schemes rather than a predictive capability,which cannot satisfactorily guide the anti-fatigue *** this study,for the first time,the predictive fatigue crack growth rate law is proposed by considering the effects of both strength and ***,a quantitative criterion is established for judging the fatigue crack resistance of high-strength *** predictive law would provide a unique view to the quantitative anti-fatigue design of metallic materials.

关键词： Fatigue crack growth Strength and toughness Paris’law High-strength steels

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Development and stability analysis of a high-speed train bearing system under variable speed conditions

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International Journal of mechanical system Dynamics 2022年第4期2卷 352-362页

作者： Baosen Wang Yongqiang Liu Bin Zhang Shaopu Yang School of Traffic and Transportation Shijiazhuang Tiedao UniversityShijiazhuangChina School of Mechanical Engineering Shijiazhuang Tiedao UniversityShijiazhuangChina Department of Electrical Engineering University of South CarolinaColumbiaUSA State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuangChina

During a high-speed train operation,the train speed changes frequently,resulting in motion change as a function of time.A dynamic model of a double‐row tapered roller bearing system of a high-speed train under variable speed conditions is *** model takes into consideration the structural characteristics of one outer ring and two inner rings of the train *** angle iteration method is used to determine the rotation angle of the roller within any time period,solving the difficult problem of determining the location of the *** outer ring and inner ring faults are captured by the model,and the model response is obtained under variable speed *** are carried out under two fault conditions to validate the model *** simulation results are found to be in good agreement with the results of the formula,and the errors between the simulation results and the experimental results when the bearing has outer and inner ring faults are found to be,respectively,5.97% and 2.59%,which demonstrates the effectiveness of the *** influence of outer ring and inner ring faults on system stability is analyzed quantitatively using the Lempel–Ziv *** results show that for low train acceleration,the inner ring fault has a more significant effect on the system stability,while for high acceleration,the outer ring fault has a more significant ***,when the train acceleration changes,the outer ring has a greater *** practice,train acceleration is usually small and does not frequently change in one operation ***,the inner ring fault of the bearing deserves more attention.

关键词： high-speed train bearing model variable speed conditions stability analysis Lempel-Ziv complexity

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Fault Diagnosis Method for Multiple Sources based on IESFSC-SSRgram

Fault Diagnosis Method for Multiple Sources based on IESFSC-...

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2024 IEEE International Conference on Sensing, Diagnostics, Prognostics, and Control, SDPC 2024

作者： Zhihao, Wu Shixian, Gong Chenguang, Huang Hang, Jin Zechao, Liu Crrc Qingdao Sifang Locomotive and Rolling Stock Co. Ltd National Engineering Laboratory Qingdao China Behavior and System Safety of Traffic Engineering Structure and School of Mechanical Engineering Shijiazhuang Tiedao University State Key Laboratory of Mechanical Shijiazhuang China Data Management Engineering Center Weichai Power Co. Ltd. Weifang China Institute of Magnetic Levitation and Electromagnetic Propulsion China Aerospace Science and Industry Corporation Limited Beijing China Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University State Key Laboratory of Mechanical Shijiazhuang China

ISBN: (纸本)9798350388855

The division and determination of frequency bands are always core problems in fault diagnosis methods for rotating machinery. Currently, the frequency band division strategy of most fault diagnosis methods is the 1/3-binary tree or realized by wavelet packet transform (such as fast kurtosis diagram and Autogram). This method is relatively fixed, making it difficult to accurately cover the resonance frequency band and achieve multi-source fault identification. To address the above problems, an adaptive frequency band division strategy based on Fast Spectral Correlation (FSC) and Scale-Space Representation (SSR) is proposed. The enhanced enveloping spectrum (EES) of each frequency band after division is obtained, and the improved Fault Quantification Index (IFQI) is used to measure the richness of target information in each enveloped spectrum (ES), generating a two-dimensional diagram. The envelope spectrum with the largest IFQI value is selected as the improved envelope spectrum (IES) obtained by the FSC and SSR division strategy (IESFSC-SSRgram), enabling the fault diagnosis of the axle box bearing. The effectiveness and superiority of the proposed method in identifying multi-source concurrent faults in the wheelset bearing system are verified by comparing it with the traditional method. © 2024 IEEE.

关键词： Binary trees

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Variable-length Genetic Algorithm based Blind Deconvolution for Railway Bearing Fault Diagnosis

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IEEE Sensors Journal 2025年

作者： Shi, Guangze Gu, Xiaohui Yang, Shaopu Li, Hefei Liu, Zechao Shijiazhuang Tiedao University State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang050043 China

Blind deconvolution (BD) methods have shown significant promise in machinery fault diagnosis, yet their performance remains constrained by fixed filter length and susceptibility to local optima. To tackle this problem, this paper presents a variable-length genetic algorithm (VGA) to optimize the blind filter for railway bearing fault diagnosis under complex interference. Unlike existing works, an attempt is made to determine the length and coefficients of the optimal blind filter in a general framework by introducing a cutting-splicing operator to replace the crossover to achieve chromosome length variation during the optimization iteration. Based on several popular BD approaches, including MED, MCKD, MGID, and MESSD, their variable-length optimized version, i.e. VGA-MED, VGA-MCKD, VGA-MGID, VGA-MESSD, are proposed and rigorously compared with the original version and the fix-length optimized version, i.e. GA-MED, GA-MCKD, GA-MGID, GA-MESSD by both simulated and experimental railway bearing faulty signals. The results demonstrated the effectiveness and adaptability of the novel methods in recovering fault-induced repetitive transients. Furthermore, the adaptability and generalizability of the given framework make it a robust solution for BD-based fault diagnosis in industrial applications. © 2001-2012 IEEE.

关键词： Genetic algorithms

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Study of Local Trajectory Planning Based on Fuzzy Dubins Risk Field

Study of Local Trajectory Planning Based on Fuzzy Dubins Ris...

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IEEE International Conference on Industrial Informatics (INDIN)

作者： Shaohua Li Boyu Ma Zekun Yang Xuewei Wang State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang CHN

ISBN: (数字)9798331527471

ISBN: (纸本)9798331527488

A reasonable and safe path is crucial for implementing vehicle active obstacle avoidance which can enhance driving safety and consequently reduce traffic accidents. A risk field that reflects road structures and obstacles is established to address the limitations of traditional algorithms. Additionally, a local planning method incorporating a fuzzy Dubins strategy is proposed. By constructing lane risk fields and obstacle potential fields using exponential functions, a fuzzy controller is developed. This controller adjusts the lane-changing timing and distance based on the environmental and obstacle information obtained from the risk fields. The vehicle trajectory planning under obstacle avoidance conditions is then achieved through Dubins curves. Simulation and experimental results indicate that the proposed local trajectory planning method based on the fuzzy Dubins risk field effectively performs active obstacle avoidance operations under various conditions. It adjusts the lane-changing timing and distance according to the relative position between the vehicle and obstacles at different speeds, demonstrating a good adaptability to different conditions.

关键词： Trajectory planning Roads Wheels Trajectory Timing safety Planning Collision avoidance Informatics Accidents

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Gas control technology for coal and gas outburst mines based on new sealing materials

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Geohazard Mechanics 2024年第3期2卷 181-188页

作者： Hongwei Zhang Hongbao Zhao Dongliang Ji Shijie Jing Yuxuan Guo School of Energy and Mining Engineering China University of Mining and Technology(Beijing)Beijing100083China State Key Laboratory of Mechanical Behavior and System Safety of Trafﬁc Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang050043China

In order to solve the problem of gas overlimit in corner corners of coal and gas prominent mines, through thecombination of air leakage mechanism in the goaf, near-ﬁeld ﬁssure expansion and rich area division, blockingmaterial development and optimization, performance measurement of blocking materials and on-site test, westarted to study the causes of gas concentration in corner corners, analysis of roof collapse and transparency incorners and performance test of blocking materials, and optimized the blocking materials by combining laboratory test and engineering test. Considering the thickness of the sealing ﬁlm, the attenuation ratio of the sealingﬁlm thickness, the gelation time, and the gelation viscosity under different ratios, we designed a multi factororthogonal experiment to optimize the optimal ratio suitable for the engineering site. Factors affecting blockingeffectiveness, such as gel water retention and gel ﬂame resistance, were also tested. The sealing scheme wasimplemented in the 2109 working face of a coal and gas outburst mine in Gansu, China. Through on-sitemonitoring of the changes in temperature, gas concentration, and air leakage at each monitoring point beforeand after the use of sealing materials, the analysis of the detection results shows that the temperature changes ateach monitoring point after the use of sealing materials do not exceed 0.2C;The change in oxygen concentrationis less than 0.27 %;The gas concentration has decreased by more than 60 %, with a decrease of 71.32 % in the gasconcentration in the upper corner. The air leakage has decreased by more than 53 %, and the proportion ofdecrease in air leakage at the upper corner is as high as 56.83 %. This air leakage control technology hasremarkable blocking effect, meets the requirements of corner near-ﬁeld ﬁssure blocking material, and is easy toprepare, inexpensive, non-toxic, tasteless and green, providing a successful experience for the treatment of similarcoal and gas outburst min

关键词： Coal and gas outburst Air leakage in goaf Near-ﬁeldﬁssure Gas concentration Air leakage

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