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Mesh stiffness calculation and vibration analysis of the spur gear pair with tooth crack,considering the misalignment between the base and root circles

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International Journal of mechanical system Dynamics 2021年第1期1卷 143-156页

作者： Jingyu Hou Shaopu Yang Qiang Li Yongqiang Liu Jiujian Wang School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijingChina State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuangChina School of Mechanical Engineering Shijiazhuang Tiedao UniversityShijiazhuangChina State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangshaChina

An improved variable cross‐section cantilever beam model for evaluating the time‐varying mesh stiffness(TVMS)of the perfect gear tooth is developed in which the tooth number of driving gear is less than 42 and that of driven is more than *** TVMS obtained by the proposed method is compared with the result without considering the misalignment between the base circle and gear *** types of root crack models and changes inTVMS of 13‐crack levels are *** fault vibration characteristic of a single‐stage spur gear reducer with root crack is ana-lyzed and the correctness is qualitatively verified by the vibration signals of an experimental gearbox with crack or missing *** results presented in this paper are of great significance for a deep understanding of the possible causes of vibration and noise of gears and provide a theoretical foundation for the fault diagnosis of the gearbox.

关键词： backlash gear potential energy method time‐varying mesh stiffness(TVMS) tooth crack

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Propagation of Rayleigh-type surface waves in a layered piezoelectric nanostructure with surface effects

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Applied Mathematics and Mechanics(English Edition) 2022年第3期43卷 327-340页

作者： Lele ZHANG Jing ZHAO Guoquan NIE Jinxi LIU State Key Laboratory of Mechanical Behavior and System Safety of Tra±c Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China Hebei Key Laboratory of Mechanics of Intelligent Materials and Structures Department of Engineering MechanicsShijiazhuang Tiedao UniversityShijiazhuang 050043China Department of Architecture Shijiazhuang Institute of Railway TechnologyShijiazhuang 050041China

This work investigates the dispersion properties of Rayleigh-type surface waves propagating in a layered piezoelectric nanostructure composed of a piezoelectric nanofilm over an elastic *** one of the most important features of nanostructures,surface effects characterized by surface stresses and surface electric displacements are taken into account through the surface piezoelectricity theory and the nonclassical mechanical and electrical boundary *** expressions of the dispersion equation are derived,and numerical results are provided to examine the effects of several surface-related parameters,including the surface elasticity,surface piezoelectricity,surface dielectricity,surface density,as well as surface residual stress,on the dispersion modes and phase *** size-dependent dispersion behaviors occurring with surface effects are also predicted,and they may vanish once the thickness of the piezoelectric nanofilm reaches a critical value.

关键词： surface effect surface piezoelectricity dispersion behavior piezoelectric nanofilm Rayleigh wave

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Low-light traffic Objects Detection for Automated Vehicles 6

Low-light Traffic Objects Detection for Automated Vehicles

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6th CAA International Conference on Vehicular Control and Intelligence, CVCI 2022

作者： Wang, Xuewei Wang, Dongmei Li, Siyuan Li, Shaohua Zeng, Pengtian Liang, Xiao Shijiazhuang Tiedao University State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang China School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang China

ISBN: (数字)9781665453745

ISBN: (纸本)9781665453745

The low-light condition brings huge challenges to the traffic object detection, limiting its application in complex scenarios such as the round-the-clock traffic monitoring and automatic driving. To address this issue, an accurate traffic object detection method in low-light conditions is proposed. First, the dark channel prior knowledge is utilized to restore the scene radiance via the transmission map and the estimation of the atmospheric light. Meanwhile, the grayscale is adjusted by adaptive gamma transformation to further improve the brightness of the image and reduce the impact of low-light conditions. Second, a LL4PH-Net framework equipped with preset anchors and detection branches is developed to detect low-light traffic objects. The performance of the algorithm is tested on the public BDD100K dataset. Experimental results show that compared with the SOTA methods, the proposed LL4PH-Net acquires the best detection mAP, the most lightweight model and a good time efficiency. It can effectively detect traffic objects even under low-light conditions. © 2022 IEEE.

关键词： Image enhancement

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VMD METHOD BASED ON FREQUENCY DOMAIN CORRELATED KURTOSIS AND ITS APPLICATION IN MULTI-FAULT DIAGNOSIS OF WHEELSET BEARING 1

VMD METHOD BASED ON FREQUENCY DOMAIN CORRELATED KURTOSIS AND...

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1st International Conference on mechanical system Dynamics, ICMSD 2022

作者： Li, Cuixing Liu, Yongqiang State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang China School of Traffic and Transportation Shijiazhuang Tiedao University Shijiazhuang China

ISBN: (数字)9781839537837

ISBN: (纸本)9781839537837

Parameter-adaptive VMD method is often used in rolling bearing fault diagnosis. The two key parameters K and D of VMD can be determined adaptively by using an intelligent optimization algorithm. The working environment of wheelset bearing is complex, and the existing parameter-adaptive VMD method is difficult to accurately extract the fault information of wheelset bearing. To solve this problem, a parameter-adaptive VMD method guided by the envelope power spectrum correlated kurtosis is proposed. Correlated kurtosis has strong directivity and is not affected by impact noise and cyclic stationary noise. Meanwhile, at low SNR, the frequency domain correlated kurtosis is more stable than the time-domain correlated kurtosis. Therefore, taking the local maximum envelope power spectrum correlated kurtosis as the objective function, and using the global searching ability of PSO, the optimal parameter combination of VMD can be adaptively determined. VMD is used to analyze the signal, calculate the envelope power spectrum correlated kurtosis of each component, and select the largest one for envelope spectrum analysis. Through simulation and experimental analysis, it is verified that this method can accurately extract the fault characteristics of wheelset bearing under complex interference. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Failure analysis

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A crystal plasticity-based constitutive model for ratchetting of cyclic hardening polycrystalline metals

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International Journal of Dynamics and Control 2020年第4期8卷 1161-1168页

作者： Ren, Xuehong Yang, Shaopu Zhao, Wenzhao Wen, Guilin State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha410082 China State Key Laboratory of Mechanical Behavior in Traffic Engineering Structure and System Safety Shijiazhuang Tiedao University Shijiazhuang050043 China

A crystal plasticity-based constitutive model is developed by modifying the second item of ArmstrongFrederick (AF) nonlinear kinematic hardening rule and introducing self-hardening and latent hardening representing the dislocation interaction between slip systems. With the help of β scale-transition rule, the cyclic stressstrain responses of polycrystalline metals can be obtained from the single crystal constitutive model. Then the developed model is applied to describe the cyclic deformation behavior of a face-centered cubic polycrystalline metal, i.e., 316L stainless steel. The predicted results of the model compared with the experiments of 316L stainless steel show that the model can not only simulate the uniaxial and multiaxial ratchetting of the face-centered cubic crystal material during the asymmetrical stress-controlled cyclic loading, but also describe the cyclic hardening characteristics of materials under symmetrical strain-controlled cyclic loading. Meanwhile, the model is capable of predicting uniaxial ratchetting of different orientations at single crystal scale. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.

关键词： Constitutive models

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Multi-field coupling and free vibration of a sandwiched functionally-graded piezoelectric semiconductor plate

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Applied Mathematics and Mechanics(English Edition) 2023年第8期44卷 1351-1366页

作者： Xueqian FANG Qilin HE Hongwei MA Changsong ZHU School of Environment and Civil Engineering Dongguan University of TechnologyDongguan 523808Guangdong ProvinceChina Guangdong Provincial Key Laboratory of Intelligent Disaster Prevention and Emergency Technologies for Urban Lifeline Engineering Dongguan University of TechnologyDongguan 523808Guangdong ProvinceChina State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China

Sandwiched functionally-graded piezoelectric semiconductor(FGPS)plates possess high strength and excellent piezoelectric and semiconductor properties,and have significant potential applications in micro-electro-mechanical *** multi-field coupling and free vibration of a sandwiched FGPS plate are studied,and the governing equation and natural frequency are derived with the consideration of electron *** material properties in the functionally-graded layers are assumed to vary smoothly,and the first-order shear deformation theory is introduced to derive the multi-field coupling in the *** total strain energy of the plate is obtained,and the governing equations are presented by using Hamilton’s *** introducing the boundary conditions,the coupling physical fields are *** numerical examples,the natural frequencies of sandwiched FGPS plates under different geometrical and physical parameters are *** is found that the initial electron density can be used to modulate the natural frequencies and vibrational displacement of sandwiched FGPS plates in the case of *** effects of the material properties of FGPS layers on the natural frequencies are also examined in detail.

关键词： sandwiched piezoelectric semiconductor(PS)plate functionally-graded layer multi-field coupling free vibration Hamilton's principle

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Learnable Operational Design Condition Monitor for Failure Prediction in Autonomous Driving

SSRN

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SSRN 2025年

作者： Xu, Haowei Bian, Yougang Li, Yang Qin, Hongmao Zhou, Hanchu Chang, Fangrong Wang, Shaofei Ye, Qing State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle Engineering Hunan University Changsha410082 China Research and Development Center of Transport Industry of Self-driving Technology China Merchants Chongqing Communications Technology Research and Design Institute Co. Ltd. Chongqing China School of Traffic and Transportation Engineering Central South University Changsha China Department of Data and System Engineering The University of Hong Kong Hong Kong School of Resources and Safety Engineering Central South University Changsha China School of Data Science China

Ensuring the safety of Autonomous Driving systems (ADS) across diverse and unpredictable operational scenarios remains a significant challenge for accident prevention. Central to this effort is the continuous monitoring of Operational Design Conditions (ODC), which encompass both in-vehicle factors and external Operational Design Domain (ODD). However, the absence of robust methodologies to precisely identify ODC boundaries hinders the deployment and adoption of high-level ADS. This paper introduces a learnable ODC monitor designed to identify implicit operational design condition boundaries to prevent ADS failures. By integrating a state-space duality encoder and a Bayesian neural network decoder, we propose an efficient learnable ODC monitor, termed ODCNet. Furthermore, to further enhance prediction reliability, residual error analysis with linear discrimination is applied for calibrating prediction. Experimental results demonstrate ODCNet's superiority in failure prediction compared to baseline models, achieving a balance between safety and coverage. These findings contribute to advancing data-driven accident prediction and prevention strategies, ensuring safer deployments of ADS in complex environments. © 2025, The Authors. All rights reserved.

关键词： Autonomous vehicles

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M-T Scheme for Predicting Effective Diffusion Coefficient of Chloride Ions in Cement-based Materials

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Journal of Wuhan University of Technology(Materials Science) 2020年第3期35卷 520-527页

作者： SUN Guowen ZHANG Jianjian ZHANG Lijuan CAO Tongning WANG Penshuo ZHANG Ying YAN Na State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShiji-azhuang 050043China School of Materials Science and Engineering Shijiazhuang TieDao UniversityShijiazhuang 050043China Foundational Subjects Department Shijiazhuang TieDao University SiFang CollegeShijiazhuang 051132China

To investigate the transport characteristics of chloride ions in cement-based materials, the Mori-Tanaka (M-T) prediction scheme of the effective diffusion coefficient in composites containing single-phase and multi-phase inclusions is systematically deduced based on the theory of composite mechanics and porous medium. The volume fraction, morphology and distribution of aggregates, as well as the interfacial transition zone (ITZ) are fully taken into consideration in this proposed model. The results show that the algorithm of M-T prediction scheme with high accuracy is relatively simple.

关键词： M-T scheme chloride ion effective diffusion coefficient cement-based materials ITZ

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Modeling and experiment study of hydraulically damped rubber mount under larger amplitude excitation at low frequency

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Noise and Vibration Worldwide 2023年第1期54卷 31-43页

作者： Liao, Xin Chen, Lin Wang, Hu Pei, Xin School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang China School of Mechanical Engineering Southeast University Nanjing China 14th Institute of China Electronic Technology Corporation Nanjing China

To improve the ride comfort of the cab of construction machinery and reduce the harm of vibration to the driver, a nonlinear lumped parameter model of passive hydraulic damping rubber mount (PHDRM) is first proposed. The nonlinearity of multi-inertial tracks is fully considered. Then, the global FE (finite element) fluid-solid coupling model of the isolator is developed in ABAQUS. The multi-field coupling solution and a joint simulation mode are employed in this paper. Meanwhile, the rubber element and inertial track parameters are identified respectively. Finally, multiple sets of dynamic performance experiments are performed on the different PHDRM samples. The experiment results indicate that the simulation results for two modeling methods of the vibration isolation system are consistent with the experimental datum. The modeling approaches have both reliability and accuracy under larger amplitude excitation at low frequency. Furthermore, the effects of different rubber elements and inertial track of PHDRM on low-frequency dynamic characteristics under larger amplitude are investigated and discussed, respectively. The experimental outcomes also provide a practical reference value for nonlinear modeling method research and dynamic performance analysis of PHDRM with complex structures further. © The Author(s) 2023.

关键词： Rubber

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An improved autogram and its application in bearing fault diagnosis 11

An improved autogram and its application in bearing fault di...

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11th International Conference on Prognostics and system Health Management, PHM-Jinan 2020

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

ISBN: (纸本)9781728151816

Envelope analysis is one of the most advantageous methods in rolling element bearing (REB) diagnosis, but the determination of the informative frequency band (IFB) is always a huge challenge. In order to reduce the influence of discrete frequency components and strong background noise to choose IFB, a new improved Autogram is provided. Firstly, the Cepstrum pre-whitening (CPW) is taken as a preprocessing method to reduce the interference from discrete frequency components in the signal. Then, the Autogram is used to decompose the pre-whitening signal and the optimal IFB is selected for a further demodulation. The simulated signals and a set of experiment signals are taken to verify its validity. The results indicates that this method can successfully address the interference generated by discrete frequency and strong background noise, and effectively extract the weak fault features of bearing. © 2020 IEEE.

关键词： Failure analysis

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