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Frost-resistant embankments with a novel ground source heat pump system

Research in Cold and Arid Regions 2024年第6期16卷 292-301页

作者： TianFei Hu Li Wang TengFei Wang TieCheng Sun TianFeng Li State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuangHebei 050043China School of Civil Engineering Shijiazhuang Tiedao UniversityShijiazhuangHebei 050043China Key Laboratory of High-Speed Railway Engineering Southwest Jiaotong UniversityMinistry of EducationChengduSichuan 610031China

This study introduces a novel artificial heating technique aimed at addressing frost heave issues in embankments on frozen ground,offering a sustainable *** evaluations assessed various heating systems,including boilers,heat pumps,solar heaters,and electric heaters,focusing on their thermal performance and *** study subsequently designed and implemented a direct-expansion ground source heat pump(DX-GSHP)system as the primary heat source for embankment *** testing confirmed the DX-GSHP system's ability to maintain a heat-supply temperature above 40℃ and a heat-absorption temperature below -3.5℃,effectively extracting geothermal energy for transfer to the topsoil *** a demonstrated coefficient of performance(COP)of 3.49,the DX-GSHP system not only proves its energy efficiency but also suggests a potential role in reducing the strain on electricity supply *** of DX-GSHPs,with heating capacities ranging from 1.0 to 2.0 kW and spaced at intervals of 2.0-4.0 m,provides a rapid thermal response to frost heave in singletrack railway embankments,thereby potentially mitigating frost-induced damage in cold climate regions.

关键词： Frost heave Embankment Artificial heating Ground source heat pump Coefficient of performance

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A NOVEL BEARING FAULT DIAGNOSIS METHOD BASED ON FEATURE FUSION AND CONVOLUTIONAL NEURAL NETWORK 1

A NOVEL BEARING FAULT DIAGNOSIS METHOD BASED ON FEATURE FUSI...

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1st International Conference on mechanical system Dynamics, ICMSD 2022

作者： Zhao, Jing Yang, Shaopu Li, Qiang Liu, Yongqiang School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang China School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang China

ISBN: (数字)9781839537837

ISBN: (纸本)9781839537837

The effective fault diagnosis method is crucial for the engineering. At present, the fault diagnosis methods based on data-driven have achieved much attention. The traditional methods only utilize one sensor or one channel data. However, there are more than one sensor or channel in the data acquisition system. To take full advantage of the connection between different channels data, a bearing fault diagnosis method based on feature fusion and convolutional neural network is put forward in this paper. First, two different channels data are fused to obtain different fault features. Then, convolutional neural network is applied to classify the different faults through the fusion features. Finally, the performance of the proposed approach is verified by the drive train dynamics simulator test. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Failure analysis

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EFFECT OF TOOTH CRACK ON MESH STIFFNESS AND VIBRATION RESPONSE OF A SPUR GEAR system WITH CLEARANCE NONLINEARITY 1

EFFECT OF TOOTH CRACK ON MESH STIFFNESS AND VIBRATION RESPON...

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1st International Conference on mechanical system Dynamics, ICMSD 2022

作者： Hou, Jingyu Li, Qiang Yang, Shaopu Liu, Yongqiang School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang China School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang China

ISBN: (数字)9781839537837

ISBN: (纸本)9781839537837

The mesh stiffness and vibration characteristics of a spur gear system are investigated when the crack propagates beyond the central line of the tooth. The time-varying mesh stiffness (TVMS) in the single-tooth engagement region and in the double-tooth engagement region for a spur gear with tooth crack is obtained based on the potential energy principle. A 4 DOF gear system considering the tooth backlash and the clearance of supporting system in the radial direction is established, and the effect of different crack sizes on the response of the system is studied. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Spur gears

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Evolution Rule of Wheel Tread Wear of High-Speed train and its Influence on Dynamic Performance

Evolution Rule of Wheel Tread Wear of High-Speed Train and i...

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

作者： Wang, Peng Liu, Zhenkai Liu, Yongqiang Yang, Shaopu Cai, Yuqiang College of Mechanical Engineering North China University of Science and Technology Tangshan China School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang China Safety of Traffic Engineering Structures Shijiazhuang Tiedao University State Key Laboratory of Mechanical Behavior and System Shijiazhuang China

ISBN: (纸本)9798350388855

To investigate the influence of wheel wear evolution on wheel-rail contact and dynamic performance of high-speed trains, taking a high-speed train as the research object, the wheel wear tracking test was carried out to analyze the evolution law of wheel wear with the running mileage. Using the wheel-rail contact geometric relationship and non-Hertz rolling contact theory, the influence of wheel wear on wheel-rail contact geometric characteristics and contact mechanical characteristics was calculated, and the wheel-rail matching performance under wear was analyzed. The vehicle model was established by UM software, and the influence of different wheel wear treads on the vehicle's dynamic performance in a lathing cycle was investigated. The results indicate that during the evolution of wheel profile, the distribution state of wheel-rail contact points changes. With the increase of wheel tread wear, the radius difference of wheel rolling circles increases, which is conducive to improving the curve passing performance of vehicles. The wear of wheel tread leads to the increase of vehicle transmissibility and the decrease of nonlinear critical speed. © 2024 IEEE.

关键词： Gear trains

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A layer-by-layer optimization strategy to constitute optimal material distribution of 3D spatial shells by stacking deformation-controlled 2D plain layers

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Applied Mathematical Modelling 2025年 147卷

作者： Jiang Ding Zhi Xing Ziyang Zeng Kunliang Xie Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology School of Mechanical Engineering Guangxi University Nanning 530004 China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi University Nanning 530004 China National Engineering Research Center of Novel Equipment for Polymer Processing The Key Laboratory of Polymer Processing Engineering of the Ministry of Education Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing South China University of Technology Guangzhou 510641 China

The stiffness of a shell is conclusively influenced by the distribution of its material. To obtain the optimal material distribution of 3D spatial shells at a reasonable computational cost, this paper proposes a layer-by-layer optimization strategy with controllable deformation. In this strategy, the 3D spatial shell is divided into finite layers in the thickness dimension, and the deformations of each layer are constrained by the presupposed target volume in the matching optimization cycle. During the optimization cycle, to minimize the computational cost, we use a dimension-reduced level set method (DR-LSM), wherein the optimal 2D plane layers of the 3D spatial shell are iterated in the 2D domain using a uniform initial design. The optimized 2D plane layers are sequentially stacked to construct the optimal material distribution of the 3D spatial shell. Both numerical calculations and experimental results demonstrate that the proposed strategy successfully achieves an optimal material distribution for 3D spatial shells while preserving their original geometric characteristics and eliminating cavity structures. Notably, the stiffness of shells with different curvatures is significantly enhanced without altering its volume and mass, proving the stability and effectiveness of this strategy.

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MODAL CHARACTERISTICS ANALYSIS FOR CAR BODY OF HIGH-SPEED ELECTRIC MULTIPLE UNITS 1

MODAL CHARACTERISTICS ANALYSIS FOR CAR BODY OF HIGH-SPEED EL...

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1st International Conference on mechanical system Dynamics, ICMSD 2022

作者： Wang, Peng Yang, Shaopu Liu, Yongqiang Zhao, Yiwei State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang China School of Transportation Shijiazhuang Tiedao University Shijiazhuang China School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang China

ISBN: (数字)9781839537837

ISBN: (纸本)9781839537837

Aiming at the problems that track irregularity and equipment operation cause complex vibration during high-speed train operation, reduce ride comfort, and affect operation safety, the modal characteristics of the vehicle body were analyzed to improve the dynamic response characteristics of the vehicle. The finite element model of the high-speed train body was established to calculate the vibration modes of the body under different mass conditions. The influence of the hanging position and hanging number of equipment under the vehicle on the modal frequency of the vehicle body was analyzed, and the variation law of modal frequency and vibration mode was obtained. Based on finite element calculation, built the vehicle body modal test system, carried out modal tests on the vehicle body, analyzed the differences and reasons between simulation and test results, and verify the correctness of numerical calculation and finite element model. The results show that the modal frequency of the car body met the relevant design standards, and the variation trend of low-order modal modes of the car body with different mass was the same. The hanging position had an obvious influence on the vertical bending of the underframe and the torsional vibration frequency of the car body. The modal frequency of the car body increased with the increase of the number of hanging points of equipment under the vehicle. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Finite element method

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Recent advancement of flow-induced piezoelectric vibration energy harvesting techniques:principles,structures,and nonlinear designs

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Applied Mathematics and Mechanics(English Edition) 2022年第7期43卷 959-978页

作者： Dongxing CAO Junru WANG Xiangying GUO S.K.LAI Yongjun SHEN Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China Beijing Key Laboratory of Nonlinear Vibrations and Strength of Mechanical Structures Beijing 100124China School of Automation Beijing Information Science and Technology UniversityBeiing 100192China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina Hong Kong Branch of National Rail Transit Electrification and Automation Engineering Technology Research Center The Hong Kong Polytechnic UniversityKowloonHong KongChina State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China

Energy harvesting induced from flowing fluids(e.g.,air and water flows)is a well-known process,which can be regarded as a sustainable and renewable energy *** addition to traditional high-efficiency devices(e.g.,turbines and watermills),the micro-power extracting technologies based on the flow-induced vibration(FIV)effect have sparked great concerns by virtue of their prospective applications as a self-power source for the microelectronic devices in recent *** article aims to conduct a comprehensive review for the FIV working principle and their potential applications for energy ***,various classifications of the FIV effect for energy harvesting are briefly introduced,such as vortex-induced vibration(VIV),galloping,flutter,and wake-induced vibration(WIV).Next,the development of FIV energy harvesting techniques is reviewed to discuss the research works in the past three *** application of hybrid FIV energy harvesting techniques that can enhance the harvesting performance is also ***,the nonlinear designs of FIV-based energy harvesters are reported in this study,e.g.,multi-stability and limit-cycle oscillation(LCO)***,advanced FIV-based energy harvesting studies for fluid engineering applications are briefly ***,conclusions and future outlook are summarized.

关键词： vibration-driven energy harvesting flow-induced vibration(FIV) piezoelectric approach nonlinear design

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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

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Applied Mathematics and Mechanics(English Edition) 2024年第11期45卷 1965-1986页

作者： Min WANG Shaopu YANG Yongqiang LIU Yanhong CHEN Kai ZHANG State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang050043China School of Traffic and Transportation Shijiazhuang Tiedao UniversityShijiazhuang050043China School of Mechanical Engineering Shijiazhuang Tiedao UniversityShijiazhuang050043China CRRC Tangshan Co. Ltd.Tangshan063000Hebei ProvinceChina China Water Resources Beifang Investigation Designand Research Co.Ltd.Tianjin300222China

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 ***,bearing temperature is one of the key parameters to be monitored in the online monitoring system for *** 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 *** 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.

关键词： axle box bearing thermal network method temperature rotational speed

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

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

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

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

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

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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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