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conference on Vehicle control and Intelligence (cVcI)

作者： Yongjie Lu Fahui Wang Guangfeng Zhang State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang China

ISBN: (数字)9781728184975

ISBN: (纸本)9781728184982

With the rapid rise of the transportation industry, commercial vehicles as an important means of transportation, its safety and stability are paid more and more attention. In order to improve the safety performance of heavy commercial vehicles when braking failure occurs under turning conditions. Based on the vehicle dynamics characteristics, this paper designed the stability control strategy in the case of brake failure in the above conditions, designed a fuzzy PID controller based on yurch angular velocity control, carried out the Trucksim-Simulink joint simulation and hardware in the loop experiment to jointly verify the control effect of the brake. The results show that the influence of vehicle brake failure on vehicle driving stability is reduced, the performance of vehicle brake under long and downhill conditions and turning conditions is improved, and the safety stability of vehicle brake failure in hardware loop is improved, which meets the requirements of national standards for vehicle braking.

关键词： Stability criteria Turning Hardware safety Brakes Acceleration Standards

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A Subdomain Adaptation Based Bearing Fault Diagnosis Method Using Infrared Thermal Images

A Subdomain Adaptation Based Bearing Fault Diagnosis Method ...

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International conference on Sensing, Diagnostics, Prognostics, and control (SDPc)

作者： Jie Yao Xiaohui Gu State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang China

ISBN: (数字)9798350388855

ISBN: (纸本)9798350388862

A sub-domain transfer learning method based on multi-scale convolutional neural network and infrared thermal images is proposed to improve the diagnostic accuracy of bearing faults. Firstly, infrared thermal images with more characteristic information are used to represent the healthy condition of bearings instead of vibration signals. Then, a multi-scale convolutional neural network model is constructed to enhance the feature extraction ability, and a sub-domain adaptation method is used to deal with the situation when training and testing samples are not consistent of independent identically distribution. The proposed method is verified by two datasets from rotating machinery and railway bearing test bench. The results show its effectiveness and robustness than some popular peer transfer learning strategies and vibration signal based methods.

关键词： Vibrations Fault diagnosis Training Time-frequency analysis Accuracy Transfer learning Feature extraction convolutional neural networks Spectrogram Testing

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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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Effects of microstructural heterogeneity on fatigue properties of cast aluminum alloys

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Journal of central South University 2020年第3期27卷 674-697页

作者： JIAO Yi-nan ZHANG Yi-fan MA Shi-qing SANG De-li ZHANG Yang ZHAO Jin-jin WU Sheng-chuan LIU Yong-qiang YANG Shao-pu School of Materials Science and Engineering Hebei Key Laboratory for Mechanics of Intelligent Materials and StructuresShijiazhuang Tiedao UniversityShijiazhuang 050043China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of Mechanical Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China

cast Al alloys are widely employed for engine components,structural parts,gear box,chassis,*** subjected to mechanical cyclic load during *** accurate fatigue life prediction of these alloys is essential for normal operation as fatigue cracks initiated during operation induce the lubrication oil leak and serious safety *** heterogeneity,including shrinkage/gaspores and secondary phase particles,is the most detrimental factor that affects fatigue life of cast Al *** approximate fatigue life cycles could be estimated based on the size distribution and locations of shrinkage pores/*** relationship between crack population and stress was reported by statistical distributions and the cumulative probability for cast Al alloys fail at a certain stress could be predicted by combination of Paris law and pore size *** depth was found to dominate the stress field around the pore on the surface and the maximum stress increases sharply when the pore intercepted with the surface at its *** microstructure of cast Al alloys usually is composed of primary Al dendrites,eutectic silicon,Fe-rich particles and other intermetallic particles are dependent upon alloy composition and heat *** coalescence of microcracks initiated from the fractured secondary phases was clearly found and can accelerate the initiation and propagation of the fatigue cracks.A link between defect features and the fatigue strength needs to be established through a good understanding of the fatigue damage mechanisms associated with the microstructural features under specific loading *** paper reviews the influences of shrinkage/gaspores and secondary phase particles,formed during casting process,on the fatigue life of Al-Si-Mg cast Al alloys.

关键词： cast aluminum alloys fatigue microstructural heterogeneous shrinkage/gas pore secondary phase particles

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Effect of Relative Phase of Loose Tie Rods on Nonlinear Dynamic behavior of Rod-Fastening Rotor-Bearing-Seal system

SSRN

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SSRN 2024年

作者： Wu, Xianglin Gu, Xiaohui State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China

The circumferential rod-fastening rotor is composed of multiple disks fastened together by preload provided by tie rods evenly distributed along the circumference of rotor. After the rotor has been running for a period of time, some tie rods will loosen and fail to provide preload due to thermal load, centrifugal load, etc. Which causes the preload that was originally evenly distributed in the circumferential direction to become uneven. Uneven preload introduces anisotropy of contact interface stiffness between rotor disks and generalized bending moments, which have important effects on nonlinear dynamic characteristics of rotor-bearing-seal system. Further, it is common for multiple tie rods to become loose at the same time in practical engineering, the relative position of loose tie rods in the circumferential direction will also have an important impact on rotor dynamics. The relevant research has not been done yet. In this paper, a contact model of the rough machined surface is firstly established by combining the statistical contact theory and fractal contact theory, and then the contact stiffness model between disks is established based on the contact model. Finally, the dynamic model of the circumferential rod-fastening rotor-bearing-seal system is established and solved. The effect of relative phase of loose tie rods on the nonlinear dynamic characteristics of rod-fastening rotor-bearing-sealing system is studied. It can be concluded that relative phase of the loose tie rod has an important influence on the frequency, bifurcation, and periodic motion of the rotor system. At lower speed, the anisotropy of contact stiffness caused by loose rods has little effect on the rotor trajectory, while the generalized bending moment has a greater influence on dynamics of the system. At higher speed, the anisotropy of contact stiffness has a great influence on the axis rail of the rod-fastening rotor. © 2024, The Authors. All rights reserved.

关键词： Bending moments

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Simultaneous resonance of Duffing oscillator with fractional-order derivative

Simultaneous resonance of Duffing oscillator with fractional...

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第八届国际振动工程会议

作者： Hang Li Yongjun Shen Department of Mechanical Engineering Shijiazhuang Tiedao University State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University

Duffing-type oscillators can describe many issues in engineering vibration, such as the vertical vibration of pantograph carbon strip suspension system, the response of coupled pitch-roll ship and the nonlinear phenomena of rotor system, and the multiple-term frequency excitation is common case in these issues. For instance, the carbon belt suspension system of pantograph, it is excited by two kinds of harmonic excitations related to the distance between droppers and the span of catenary respectively. In this paper, the simultaneous resonance of fractional-order Duffing oscillator excited by two-term frequency is studied, and the fractional-order term is introduced due to the fact that many materials or devices in engineering exhibit obvious viscoelasticity, which could be accurately described by fractional-order *** approximately analytical solution of the system is obtained by the method of multiple scales, and the amplitude-frequency curve equation and phase-frequency curve equation of the steady-state response are derived from the analytical solution. Furthermore, Lyapunov’s first method is used to quantitatively calculate the stability condition of the steady-state response, based on this, the stability of the simultaneous resonance is analyzed. The effects of nonlinear factor and fractional-order term on the steady-state response is also analyzed by numerical simulation, and the general effects mechanism of the fractional-order term on the mass-spring-damping（MSD） system is revealed, i.e., the equivalent linear stiffness and equivalent linear damping of the fractional-order term are embodied simultaneously in the MSD system, and the focus and intensity of the effects are determined by fractional order and coefficient respectively.

关键词：

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Experimental and calculation of flexuralmechanical properties of reinforced reactive powder concrete simply supported beams

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Gongcheng Lixue/engineering Mechanics 2020年第6期37卷 131-139页

作者： Li, Hai-Yan Zhang, Bo-Yang Li, Jin-Shu State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University ShijiazhuangHebei050043 China Mechanics Engineering Department Shijiazhuang Tiedao University ShijiazhuangHebei050043 China

Reactive powder concrete (RPc) has superior strength, high toughness and excellent durability compared with ordinary concrete (Oc). The calculation method of the strength and stiffness of components of RPc is inevitably different from ordinary concrete components. A full-scale test on the bending performance of four reinforced RPc simply supported beams is conducted. The cracking moment, ultimate bending moment and mid-span load-deformation curve of the beam are obtained. The bending deformation characteristics and failure modes of RPc simply supported beams are revealed, and the calculation formulas for the cracking moment and the bending strength of the RPc simply supported beams are derived. The ultimate compressive strain of steel fiber reinforced RPc is 4394 μΕ~5200 μΕ, and the cracking strain is 690 μΕ~820 μΕ, which are much larger than those of Oc. Due to the addition of steel fibers, the influence of the tensile stress of the RPc tension zone must be considered. The derived cracking moment, the normal section bending capacity and the calculated value of the stiffness are in good agreement with the experimental values. The calculation formula has high precision and can be used for the design calculation of reinforced RPc beams. © 2020, engineering Mechanics Press. All right reserved.

关键词： Stiffness

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Principal resonance analysis of piecewise nonlinear oscillator with fractional differential

Principal resonance analysis of piecewise nonlinear oscillat...

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第八届国际振动工程会议

作者： Meiqi Wang Wenli Ma Enli chen Shaopu Yang State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University School of Mechanical Engineering Shijiazhuang Tiedao University

To analyze the piecewise non-linear system with fractional order differential, we introduced fractional order into the two piecewise systems to accurately describe the stress relaxation of viscoelastic materials. We also established a non-linear dynamic model with non-linear stiffness, damping, and fractional order multi-piecewise points. Under periodic excitation,the equation of amplitude frequency relationship of the system was obtained using the average method, and the amplitude frequency response characteristics under different damping, stiffness,and fractional order parameters were provided. The influence of non-linear factors and fractional order terms on the stability of the system was studied. The chaotic behavior of the system under different parameter disturbances was studied, and the results indicate that the system presents chaotic behavior with the change of disturbance parameters. Moreover, the decrease of linear damping will subject the system to a wider range of chaotic state.

关键词： Principal resonance analysis of piecewise nonlinear oscillator with fractional differential

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Design and evaluation of cab seat suspension system based on negative stiffness structure

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Journal of Southeast University(English Edition) 2021年第2期37卷 153-163页

作者： Liao Xin Zhang Ning Xing Haijun Zhang Wanjie School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang 050043 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang 050043 China School of Mechanical Engineering Southeast University Nanjing 211189 China

To improve the vibration-isolation performance of cab seats,the optimization model of the seat suspension system of construction machinery cabs is proposed based on the negative stiffness *** negative stiffness nonlinear kinetic equation is established by designing the seat negative stiffness suspension structure(NSS).Using MATLAB,the different parameters of the suspension system and their influences on the dynamic stiffness are *** ideal configuration parameter range of the suspension system is ***,the optimization model of NSS is proposed,and the vibration transmissibility characteristics are simulated and analyzed by different *** results show that the displacement and acceleration amplitudes of the optimized seat suspension system are evidently reduced,and the four-time power vibration dose value and root mean square calculation values in the vertical vibration direction of the seat decrease by 86%and 87%,*** effective amplitude transmissibility(SEAT)and the vibration transmissibility ratio values also ***,the peak frequencies of the vibration transmitted to the driver deviate from the key frequency values,which easily cause human ***,the design of the seat suspension system has no effect on the health condition of the driver after being *** findings also illustrate that the NSS suspension system has good vibration-isolation performance,and the driver's ride comfort is improved.

关键词： construction machinery negative stiffness structure seat suspension system dynamic properties ride comfort

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A New Semi-active control Strategy and Its Application in Railway Vehicles

A New Semi-active Control Strategy and Its Application in Ra...

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International conference on Applied Nonlinear Dynamics, Vibration and control, IcANDVc 2021

作者： Yiwei, Zhao Shaopu, Yang Yongqiang, Liu Yingying, Liao Pengfei, Liu State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China School of Transportation Shijiazhuang Tiedao University Shijiazhuang050043 China School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China

ISBN: (纸本)9789811659119

With the continuous improvement of high-speed railway train operation speed, the problems of train operation safety and wheel rail wear are increasingly prominent. Improving train safety and reducing wheel rail wear can reduce operation and maintenance costs and bring greater economic benefits. In this context, a new semi-active control strategy applied in a Magnetorheological damper (MRD) is proposed to improve train safety and reduce wheel rail wear. Firstly, the transmission characteristics of the vehicle are analyzed according to the lateral vibration model of one quarter of two degrees of freedom. Then, the co-simulation model of Universal Mechanism (UM) and MATLAB is established, and the proposed control strategy is applied to the model to study its impact on the dynamic performance of the train. At the same time, the paper analyzes the influence of the control strategy on the dynamic performance of the train under different wearing levels. The results show that the control strategy can reduce the derailment coefficient of the train and the lateral force of the wheel axle, and improve the safety of the train greatly. At the same time, the wheel rail wear is reduced, the wheel wear degree is reduced, and the lathing cycle is prolonged. In addition, the control strategy can take into account the ride comfort of the train and maintain the good operation quality of the train. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： MATLAB

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