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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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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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Establishment of Dynamic Model for Axle Box Bearing of High-Speed Trains Under Variable Speed Conditions

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Chinese Journal of mechanical engineering 2022年第4期35卷 340-351页

作者： Yongqiang Liu Baosen Wang Bin Zhang Shaopu Yang School of Mechanical Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of Trafc and Transportation Shijiazhuang Tiedao UniversityShijiazhuang 050043China College of Engineering and Computing University of South CarolinaColumbiaSouth Carolina 29208USA State Key Laboratory of Mechanical Behavior and System Safety of Trafc Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China

In this study,a dynamic model for the bearing rotor system of a high-speed train under variable speed conditions is *** contrast to previous studies,the contact stress is simplifed in the proposed model and the compensation balance excitation caused by the rotor mass eccentricity *** angle iteration method is used to overcome the challenge posed by the inability to determine the roller space position during bearing *** simulation results show that the model accurately describes the dynamics of bearings under varying speed profles that contain acceleration,deceleration,and speed oscillation *** order ratio spectrum of the bearing vibration signal indicates that both the single and multiple frequencies in the simulation results are consistent with the theoretical *** on bearings with outer and inner ring faults under various operating conditions are performed to verify the developed model.

关键词： Variable speed conditions High-speed train Bearing model Angle iteration Order ratio spectrum

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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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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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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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A Numerical-Analytical Method for Time-Fractional Dual-Phase-Lag Models of Heat Transfer

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Advances in Applied Mathematics and Mechanics 2022年第3期14卷 666-702页

作者： Ji Lin Sergiy Reutskiy Wenjie Feng Key Laboratory of Coastal Disaster and Defence(Ministry of Education) Hohai UniversityNanjingJiangsu 210098China State Key Laboratory of Acoustic Institute of AcousticsChinese Academy of SciencesBeijing 100190China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuangHebei 050043China State Institution"Institute of Technical Problems of Magnetism of the National Academy of Sciences of Ukraine" Industrialnaya St.1961106KharkovUkraine

The aim of this paper is to present the backward substitution method for solving a class of fractional dual-phase-lag models of heat *** proposed method is based on the Fourier series expansion along the spatial coordinate over the orthonormal basis formed by the eigenfunctions of the corresponding Sturm-Liouville *** Fourier expansion of the solution transforms the original fractional par-tial differential equation into a sequence of multi-term fractional ordinary differential *** fractional equations are solved by the use of the backward substi-tution *** numerical examples with temperature-jump boundary condition and parameters of the tissue conﬁrm the high accuracy and efﬁciency of the proposed numerical scheme.

关键词： Heat transfer dual-phase-lag model fractional partial differential equation semi-analytical method

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APPLICATION AND DYNAMICS OF MR DAMPER IN THE SECONDARY SUSPENSION system OF HIGH SPEED TRAINS 1

APPLICATION AND DYNAMICS OF MR DAMPER IN THE SECONDARY SUSPE...

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1st International Conference on mechanical system Dynamics, ICMSD 2022

作者： Zhao, Yiwei Yang, Shaopu Liu, Yongqiang Liao, Yingying Wang, Peng 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 School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang China

ISBN: (数字)9781839537837

ISBN: (纸本)9781839537837

With the increasing of the train speed, the dynamic performance of the train continues to deteriorate. Therefore, how to ensure the dynamic performance of trains including the ride comfort and stability is an important issue for engineers. In this paper, how to ensure the ride comfort of high speed trains is researched. The semi-active control technology of secondary lateral dampers is used to improve the ride comfort of the train. Firstly, a full-scale high speed train model is established by using the Universal Mechanism(UM) software, and the traditional LQR(Linear quadratic regulator) algorithm based on a 9 degrees of freedom(dof) model of high speed trains is used to calculate the active control force. Secondly, the magnetorheological(MR) damper model is used to track the control force through a tracking force controller designed in this paper, and then the MR damping force is fed back to the full-scale vehicle model to form a closed-loop system. Finally, the semi-active simulations is performed. The simulation and comparison results show that the semi-active control based on the LQR method can restrain the lateral vibration of the car body and improve the ride comfort of the train obviously. Although it deteriorates the running safety a little, it is still within the allowable range. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Closed loop systems

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Bearing fault diagnosis Based on 1-D DenseNet-LSTM

Bearing fault diagnosis Based on 1-D DenseNet-LSTM

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2022 International Conference on Computer engineering and Artificial Intelligence, ICCEAI 2022

作者： Zhao, Zhihong Liu, Kejian Zhao, Jingjiao Shijiazhuang TieDao University School of Information Science and Technology Shijiazhuang050043 China Shijiazhuang TieDao University State Key Laboratory of Structural Mechanics Behavior and System Safety of Traffic Engineering Shijiazhuang050043 China

ISBN: (数字)9781665468039

ISBN: (纸本)9781665468039

Rolling bearing, as a vulnerable part of rotating machinery, acts an essential role in mechanical equipment. Once fails, it will cause huge economic losses, even lead to major safety accidents which threaten human life. Considering that, it's of great significance for the bearing fault diagnosis. Aiming at the issue that the accuracy of the shallow diagnosis model is limited in big data set and generalization ability is weak, an end-To-end fault diagnosis method based on one-dimensional densely connected convolutional neural network and long short-Term memory neural network (1-D DenseNet-LSTM) is proposed. First, the bearing vibration signal after preprocessing is input into the fault diagnosis model. Then, Convolution layer can effectively extract the local features of bearing vibration signal, in which, dense connection mechanism will fuse the low-level features and high-level features. After that, LSTM layer pays more attention to temporal information and extracts deep features. Finally, the fault feature information is fully extracted and input to the classification layer and output the fault type. Experiments showed that the fault diagnosis model based on 1-D DenseNet-LSTM can fully extract bearing fault feature information, and classify different fault types effectively. The accuracy of bearing fault diagnosis is more than 99%, which has higher accuracy of diagnosis compared with the depth network model. © 2022 IEEE.

关键词： Failure analysis

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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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