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Dynamic Damage Detection and Assessment on the Bogie Frame of High-Speed Train Based on the Coupled Elastic and Multibody Dynamics Scheme

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Acta Mechanica Solida Sinica 2023年第5期36卷 633-646页

作者： Yating Han Wangdong Shi wenjie feng School of Civil Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China Department of Engineering Mechanics Shijiazhuang Tiedao UniversityShijiazhuang 050043China Hebei Key Laboratory for Mechanics of Smart Materials and Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China

The dynamic cumulative damage of rigid-flexible coupling model of high-speed train with flexible bogie frame is performed by using the coupled scheme of elastic and multibody dynamics *** motion equations of the present problem are firstly established by integrating the finite element method and floating frame of reference approach based on the virtual power principle and D'Alembert *** process of condensing the elastic DOFs of the obtained finite element model involving the incorporation of the substructure technique and sparse approximate inverse method is tentatively carried ***,the motion equations are further solved by virtue of the generalized α method and the Jacobian-free Newton-Krylov *** the superiority of coupled scheme is proven by comparing with the traditional ***,besides the dynamic behaviors of the considered vehicle model,the time-variations of stresses on the elastic bogie frame's dangerous nodes and the distributions of stresses of bogie frame at some specified moments are synchronously calculated and *** importantly,the real-time and time-varying cumulative damages of some typical nodes on bogie frame are investigated.

关键词： Coupled elastic and multibody dynamics scheme Flexible bogie frame Dynamic damage analysis

Bending analysis of magnetoelectroelastic nanoplates resting on Pasternak elastic foundation based on nonlocal theory

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Applied Mathematics and Mechanics(English Edition) 2020年第12期41卷 1769-1786页

作者： wenjie feng ZhenYAN JiLIN CZZHANG Department of Engineering Mechanics Shijiazhuang Tiedao UniversityShijiazhuang 050043China Hebei Key Laboratory of Smart Material and Structure Mechanics Shijiazhuang Tiedao UniversityShijiazhuang 050043China Department of Civil Engineering University of SiegenSiegen D-57068Germany China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering International Center for Simulation Software in Engineering and SciencesCollege of Mechanics and MaterialsHohai UniversityNanjing 211100China

Based on the nonlocal theory and Mindlin plate theory,the governing equations(i.e.,a system of partial differential equations(PDEs)for bending problem)of magnetoelectroelastic(MEE)nanoplates resting on the Pasternak elastic foundation are first derived by the variational *** polynomial particular solutions corresponding to the established model are then obtained and further employed as basis functions with the method of particular solutions(MPS)to solve the governing equations *** is confirmed that for the present bending model,the new solution strategy possesses more general applicability and superior flexibility in the selection of collocation *** effects of different boundary conditions,applied loads,and geometrical shapes on the bending properties of MEE nanoplates are evaluated by using the developed *** important conclusions are drawn,which should be helpful for the design and applications of electromagnetic nanoplate structures.

关键词： magnetoelectroelastic(MEE)nanoplate bending nonlocal theory Mindlin plate theory method of particular solution(MPS) polynomial basis function

A PENNY-SHAPED CRACK IN A MAGNETOELECTROELASTIC LAYER UNDER RADIAL SHEAR IMPACT LOADING

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Acta Mechanica Solida Sinica 2007年第3期20卷 275-282页

作者： feng wenjie Nie Hui Han Xu Department of Engineering Mechanics Shijiazhuang Railway Institute Shijiazhuang 050043 China State Key Lab Adv Design ＆ Manufacture Vehicle Bo Hunan University Changsha 410082 China

This paper analyzes the dynamic magnetoelectroelastic behavior induced by a pennyshaped crack in a magnetoelectroelastic layer. The crack surfaces are subjected to only radial shear impact loading. The Laplace and Hankel transform techniques are employed to reduce the problem to solving a Fredholm integral equation. The dynamic stress intensity factor is obtained and numerically calculated for different layer heights. And the corresponding static solution is given by simple analysis. It is seen that the dynamic stress intensity factor for cracks in a magnetoelectroelastic layer has the same expression as that in a purely elastic material. And the influences of layer height on both the dynamic and static stress intensity factors are insignificant as h/a 〉 2.

关键词： magnetoelectroelastic layer penny-shaped crack impact stress intensity factor Hankel transform Laplace transform

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

Application of the extended traction boundary element-free method to the fracture of two-dimensional infinite magnetoelectroelastic solid

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Science China(Physics,Mechanics & Astronomy) 2011年第6期54卷 1141-1153页

作者： feng wenjie LI YanSong HAN Xu XU ZengHe Department of Engineering Mechanics Shijiazhuang Tiedao UniversityShijiazhuang 050043China College of Civil Engineering Hebei University of EngineeringHandan 056038China Institute of Engineering Mechanics Northeastern UniversityShenyang 110004China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China

A novel extended traction boundary element-free method is proposed to analyze the crack problems of two-dimensional infinite magnetoelectroelastic *** extended traction boundary integral equation only involving Cauchy singularity is firstly ***,the extended dislocation densities on the crack surface are expressed as the combination of a characteristic term and unknown weight functions,and the radial point interpolation method is adopted to approximate the unknown weight *** numerical scheme of the extended traction boundary element-free method is further established,and an effective numerical procedure is used to evaluate the Cauchy singular ***,the stress intensity factor,electric displacement intensity factor and magnetic induction intensity factor are computed for some selected crack problems that contain straight,curved and branched cracks,and good numerical results are *** the same time,the fracture properties of these crack problems are discussed.

关键词： boundary element-free method boundary integral equation radial point interpolation method crack problem magnetoelectroelastic materials

Dynamic effective elastic modulus of polymer matrix composites with dense piezoelectric nano-fibers considering surface/interface effect

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Science China(Physics,Mechanics & Astronomy) 2015年第1期58卷 125-132页

作者： FANG XueQian HUANG MingJuan ZHU ZiTao LIU JinXi feng wenjie Department of Engineering Mechanics Shijiazhuang Tiedao University School of Mathematics and Science Xiamen University

Based on effective field method,the dynamic effective elastic modulus of polymer matrix composites embedded with dense piezoelectric nano-fibers is obtained,and the interacting effect of piezoelectric surfaces/interfaces around the nano-fibers is *** multiple scattering effects of harmonic anti-plane shear waves between the piezoelectric nano-fibers with surface/interface are averaged by effective field *** analyze the interacting results among the random nano-fibers,the problem of two typical piezoelectric nano-fibers is introduced by employing the addition theorem of Bessel *** numerical calculations,the influence of the distance between the randomly distributed piezoelectric nano-fibers under different surface/interface parameters is *** effect of piezoelectric property of surface/interface on the effective shear modulus under different volume fractions is also *** with the simplified cases is given to validate this dynamic electro-elastic model.

关键词： piezoelectric nanocomposites dense nano-fibers dynamic effective properties effective field method

Identification of Early Peach Aphid Infestation Based on Hyperspectral Imaging Technology

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Journal of Beijing Institute of Technology 2023年第3期32卷 374-383页

作者： Yangyang Fan wenjie feng Zhengjun Qiu Shuai Wang Institute of Agricultural Information and Economics Shandong Academy of Agricultural SciencesJinan 250000China College of Biosystems Engineering and Food Science Zhejiang UniversityHangzhou 310000China

Peach aphid is a common pest and hard to *** study employs hyperspectral imaging technology to identify early damage in green cabbage caused by peach *** principal component transformation and multiple linear regression analysis,the correlation relation between spectral characteristics and infestation stage is ***,four characteristic wavelength selection methods are compared and optimal characteristic wavelengths subset is determined to be input for *** linear algorithm and two nonlinear modelling algorithms are ***,support vector machine(SVM)model based on the characteristic wavelengths selected by multi-cluster feature selection(MCFS)acquires the highest identification accuracy,which is 98.97%.These results indicate that hyperspectral imaging technology have the ability to identify early peach aphid infestation stages on green cabbages.

关键词： peach aphid hyperspectral imaging machine learning green cabbage

Influence Factors on the Distribution of Tidal Bar in Tide-Dominated Estuary: Insight from Deposition Numerical Simulation

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Acta Geologica Sinica(English Edition) 2018年第5期92卷 2050-2051页

作者： YIN Yanshu ZHOU Han feng wenjie HUANG Jixin LIU Shangqi School of Geosciences Yangtze University America Branch Research institute of Petroleum Exploration & Development

Objective The Mcmurray Formation oil sands in the Athabasca region of Canada are mainly a deposit of tide-dominated estuary and an important target of oil and gas exploration of ***,the outcrop and the subsurface reservoir of tide-dominated estuary are few,and the formation mechanisms and distribution of estuarine sand bar are ambiguous due to the interaction of fluvial and tide process in opposite direction, which has posed challenge for the efficient exploration and development of oil sands.

关键词： Simulation

Dynamic crushing behavior and energy absorption of hybrid auxetic metamaterial inspired by Islamic motif art

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Applied Mathematics and Mechanics(English Edition) 2023年第3期44卷 345-362页

作者： Ruilan TIAN Huaitong GUAN Xuhao LU Xiaolong ZHANG Huanan HAO wenjie feng Guanglei ZHANG Department of Engineering Mechanics Hebei Key Laboratory of 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 Materials Science and Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China

Auxetic honeycomb structures are promising metamaterials with outstanding mechanical properties,and can be potentially used in energy absorption *** this study,a novel modified re-entrant hybrid auxetic metamaterial inspired by Islamic motif art is designed by integrating four-pointed double re-entrant motifs with symmetric semi-hexagonal unit cells to achieve a high energy absorption capacity(EAC).Theoretical analyses and numerical simulations are performed to examine the dynamic crushing behavior of the four-pointed double re-entrant combined structure(FDRCS).The developed finite element models(FEMs)are validated by the experiments under quasi-static *** deformation mode and stress-strain curves are further studied under low,medium,and high crushing *** theoretically predicted plateau stress of the FDRCS under different crushing velocities is consistent with the numerical simulation *** crushing stress and the EAC of the FDRCS are influenced by the geometric parameters and crushing *** FDRCS exhibits a negative Poisson's ratio(NPR),owing to the four-point re-entrant structure(RES).Moreover,the specific energy absorption(SEA)of these structures is higher than that of nonauxetic hexagonal and auxetic re-entrant structures,owing to the generation of more plastic hinges that dissipate more energy during dynamic crushing.

关键词： re-entrant honeycomb auxetic hybrid metamaterial energy-absorption dynamic crushing