The Experts below are selected from a list of 973464 Experts worldwide ranked by ideXlab platform
Bing Wu - One of the best experts on this subject based on the ideXlab platform.
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analysis on thermal effect on high speed wheel rail adhesion under interfacial Contamination using a three dimensional model with surface roughness
Wear, 2016Co-Authors: Zefeng Wen, Bing Wu, Tao Wu, Xuesong JinAbstract:Abstract A three-dimensional numerical model of wheel/rail in rolling contact is established to study the adhesion characteristics under interfacial Contamination considering surface roughness at high speed. The thermal partial elastohydrodynamic lubrication (EHL) theory in elliptical contact is used in the model. The numerical model is successfully solved by applying the iterative algorithm between the pressure field and temperature field. Multilevel method is used to solve modified Reynolds equation. Sweeping column method is used to solve energy and heat conduction equations. The effects of train speed, surface roughness amplitudes, roughness orientation and axle load on the adhesion coefficient under interfacial Contamination are numerically investigated. A typical creepage-traction curve under oil Contamination is obtained at high speed by the present model. In addition, the effects of temperature and the elastic-plastic deformation behaviour of asperities on the adhesion coefficient are discussed in the paper. Furthermore, the effect of different interfacial Contaminations on wheel/rail adhesion using the present model on the adhesion coefficient is investigated. In order to validate the present model, the numerical results are compared with the experimental results that were obtained by JD-2 high-speed wheel/rail rolling contact machine under water/oil Contaminations.
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Analysis on thermal effect on high-speed wheel/rail adhesion under interfacial Contamination using a three-dimensional model with surface roughness
Wear, 2016Co-Authors: Bing Wu, Zefeng Wen, Tao Wu, Xuesong JinAbstract:A three-dimensional numerical model of wheel/rail in rolling contact is established to study the adhesion characteristics under interfacial Contamination considering surface roughness at high speed. The thermal partial elastohydrodynamic lubrication (EHL) theory in elliptical contact is used in the model. The numerical model is successfully solved by applying the iterative algorithm between the pressure field and temperature field. Multilevel method is used to solve modified Reynolds equation. Sweeping column method is used to solve energy and heat conduction equations. The effects of train speed, surface roughness amplitudes, roughness orientation and axle load on the adhesion coefficient under interfacial Contamination are numerically investigated. A typical creepage-traction curve under oil Contamination is obtained at high speed by the present model. In addition, the effects of temperature and the elastic-plastic deformation behaviour of asperities on the adhesion coefficient are discussed in the paper. Furthermore, the effect of different interfacial Contaminations on wheel/rail adhesion using the present model on the adhesion coefficient is investigated. In order to validate the present model, the numerical results are compared with the experimental results that were obtained by JD-2 high-speed wheel/rail rolling contact machine under water/oil Contaminations.
Xuesong Jin - One of the best experts on this subject based on the ideXlab platform.
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analysis on thermal effect on high speed wheel rail adhesion under interfacial Contamination using a three dimensional model with surface roughness
Wear, 2016Co-Authors: Zefeng Wen, Bing Wu, Tao Wu, Xuesong JinAbstract:Abstract A three-dimensional numerical model of wheel/rail in rolling contact is established to study the adhesion characteristics under interfacial Contamination considering surface roughness at high speed. The thermal partial elastohydrodynamic lubrication (EHL) theory in elliptical contact is used in the model. The numerical model is successfully solved by applying the iterative algorithm between the pressure field and temperature field. Multilevel method is used to solve modified Reynolds equation. Sweeping column method is used to solve energy and heat conduction equations. The effects of train speed, surface roughness amplitudes, roughness orientation and axle load on the adhesion coefficient under interfacial Contamination are numerically investigated. A typical creepage-traction curve under oil Contamination is obtained at high speed by the present model. In addition, the effects of temperature and the elastic-plastic deformation behaviour of asperities on the adhesion coefficient are discussed in the paper. Furthermore, the effect of different interfacial Contaminations on wheel/rail adhesion using the present model on the adhesion coefficient is investigated. In order to validate the present model, the numerical results are compared with the experimental results that were obtained by JD-2 high-speed wheel/rail rolling contact machine under water/oil Contaminations.
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Analysis on thermal effect on high-speed wheel/rail adhesion under interfacial Contamination using a three-dimensional model with surface roughness
Wear, 2016Co-Authors: Bing Wu, Zefeng Wen, Tao Wu, Xuesong JinAbstract:A three-dimensional numerical model of wheel/rail in rolling contact is established to study the adhesion characteristics under interfacial Contamination considering surface roughness at high speed. The thermal partial elastohydrodynamic lubrication (EHL) theory in elliptical contact is used in the model. The numerical model is successfully solved by applying the iterative algorithm between the pressure field and temperature field. Multilevel method is used to solve modified Reynolds equation. Sweeping column method is used to solve energy and heat conduction equations. The effects of train speed, surface roughness amplitudes, roughness orientation and axle load on the adhesion coefficient under interfacial Contamination are numerically investigated. A typical creepage-traction curve under oil Contamination is obtained at high speed by the present model. In addition, the effects of temperature and the elastic-plastic deformation behaviour of asperities on the adhesion coefficient are discussed in the paper. Furthermore, the effect of different interfacial Contaminations on wheel/rail adhesion using the present model on the adhesion coefficient is investigated. In order to validate the present model, the numerical results are compared with the experimental results that were obtained by JD-2 high-speed wheel/rail rolling contact machine under water/oil Contaminations.
Tao Wu - One of the best experts on this subject based on the ideXlab platform.
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analysis on thermal effect on high speed wheel rail adhesion under interfacial Contamination using a three dimensional model with surface roughness
Wear, 2016Co-Authors: Zefeng Wen, Bing Wu, Tao Wu, Xuesong JinAbstract:Abstract A three-dimensional numerical model of wheel/rail in rolling contact is established to study the adhesion characteristics under interfacial Contamination considering surface roughness at high speed. The thermal partial elastohydrodynamic lubrication (EHL) theory in elliptical contact is used in the model. The numerical model is successfully solved by applying the iterative algorithm between the pressure field and temperature field. Multilevel method is used to solve modified Reynolds equation. Sweeping column method is used to solve energy and heat conduction equations. The effects of train speed, surface roughness amplitudes, roughness orientation and axle load on the adhesion coefficient under interfacial Contamination are numerically investigated. A typical creepage-traction curve under oil Contamination is obtained at high speed by the present model. In addition, the effects of temperature and the elastic-plastic deformation behaviour of asperities on the adhesion coefficient are discussed in the paper. Furthermore, the effect of different interfacial Contaminations on wheel/rail adhesion using the present model on the adhesion coefficient is investigated. In order to validate the present model, the numerical results are compared with the experimental results that were obtained by JD-2 high-speed wheel/rail rolling contact machine under water/oil Contaminations.
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Analysis on thermal effect on high-speed wheel/rail adhesion under interfacial Contamination using a three-dimensional model with surface roughness
Wear, 2016Co-Authors: Bing Wu, Zefeng Wen, Tao Wu, Xuesong JinAbstract:A three-dimensional numerical model of wheel/rail in rolling contact is established to study the adhesion characteristics under interfacial Contamination considering surface roughness at high speed. The thermal partial elastohydrodynamic lubrication (EHL) theory in elliptical contact is used in the model. The numerical model is successfully solved by applying the iterative algorithm between the pressure field and temperature field. Multilevel method is used to solve modified Reynolds equation. Sweeping column method is used to solve energy and heat conduction equations. The effects of train speed, surface roughness amplitudes, roughness orientation and axle load on the adhesion coefficient under interfacial Contamination are numerically investigated. A typical creepage-traction curve under oil Contamination is obtained at high speed by the present model. In addition, the effects of temperature and the elastic-plastic deformation behaviour of asperities on the adhesion coefficient are discussed in the paper. Furthermore, the effect of different interfacial Contaminations on wheel/rail adhesion using the present model on the adhesion coefficient is investigated. In order to validate the present model, the numerical results are compared with the experimental results that were obtained by JD-2 high-speed wheel/rail rolling contact machine under water/oil Contaminations.
Zefeng Wen - One of the best experts on this subject based on the ideXlab platform.
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analysis on thermal effect on high speed wheel rail adhesion under interfacial Contamination using a three dimensional model with surface roughness
Wear, 2016Co-Authors: Zefeng Wen, Bing Wu, Tao Wu, Xuesong JinAbstract:Abstract A three-dimensional numerical model of wheel/rail in rolling contact is established to study the adhesion characteristics under interfacial Contamination considering surface roughness at high speed. The thermal partial elastohydrodynamic lubrication (EHL) theory in elliptical contact is used in the model. The numerical model is successfully solved by applying the iterative algorithm between the pressure field and temperature field. Multilevel method is used to solve modified Reynolds equation. Sweeping column method is used to solve energy and heat conduction equations. The effects of train speed, surface roughness amplitudes, roughness orientation and axle load on the adhesion coefficient under interfacial Contamination are numerically investigated. A typical creepage-traction curve under oil Contamination is obtained at high speed by the present model. In addition, the effects of temperature and the elastic-plastic deformation behaviour of asperities on the adhesion coefficient are discussed in the paper. Furthermore, the effect of different interfacial Contaminations on wheel/rail adhesion using the present model on the adhesion coefficient is investigated. In order to validate the present model, the numerical results are compared with the experimental results that were obtained by JD-2 high-speed wheel/rail rolling contact machine under water/oil Contaminations.
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Analysis on thermal effect on high-speed wheel/rail adhesion under interfacial Contamination using a three-dimensional model with surface roughness
Wear, 2016Co-Authors: Bing Wu, Zefeng Wen, Tao Wu, Xuesong JinAbstract:A three-dimensional numerical model of wheel/rail in rolling contact is established to study the adhesion characteristics under interfacial Contamination considering surface roughness at high speed. The thermal partial elastohydrodynamic lubrication (EHL) theory in elliptical contact is used in the model. The numerical model is successfully solved by applying the iterative algorithm between the pressure field and temperature field. Multilevel method is used to solve modified Reynolds equation. Sweeping column method is used to solve energy and heat conduction equations. The effects of train speed, surface roughness amplitudes, roughness orientation and axle load on the adhesion coefficient under interfacial Contamination are numerically investigated. A typical creepage-traction curve under oil Contamination is obtained at high speed by the present model. In addition, the effects of temperature and the elastic-plastic deformation behaviour of asperities on the adhesion coefficient are discussed in the paper. Furthermore, the effect of different interfacial Contaminations on wheel/rail adhesion using the present model on the adhesion coefficient is investigated. In order to validate the present model, the numerical results are compared with the experimental results that were obtained by JD-2 high-speed wheel/rail rolling contact machine under water/oil Contaminations.
Kenichi Fujii - One of the best experts on this subject based on the ideXlab platform.
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Surface Layer Analysis of Si Sphere by XRF and XPS
IEEE Transactions on Instrumentation and Measurement, 2015Co-Authors: Lulu Zhang, Naoki Kuramoto, Akira Kurokawa, Yasushi Azuma, Kenichi FujiiAbstract:To reduce the uncertainty of the Avogadro constant for the new definition of the kilogram, the surface analysis of the Si sphere produced for the accurate determination of the Avogadro constant is indispensable. In this paper, we conducted the surface quantitative analyses to find out the metallic Contaminations on a 1-kg natural Si sphere by X-ray fluorescence analysis. The X-ray photoelectron spectroscopy investigations were also carried out to estimate the thickness of the oxide layer and clarify the chemical binding state of the carbonaceous Contamination layer on the surface of a dummy Si sphere.
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Surface layer analysis of Si sphere by XRF and XPS
29th Conference on Precision Electromagnetic Measurements (CPEM 2014), 2014Co-Authors: Lulu Zhang, Naoki Kuramoto, Akira Kurokawa, Yasushi Azuma, Kenichi FujiiAbstract:To reduce the uncertainty of the Avogadro constant for the new definition of the kilogram, the surface analysis of the Si sphere produced for the accurate determination of the Avogadro constant is indispensable. In this work, we conducted the surface quantitative analysis to find out the metallic Contaminations of a Si sphere by x-ray fluorescence (XRF) spectroscopy. The x-ray photoelectron spectroscopy (XPS) investigations were also carried out to estimate the thickness of the oxide layer and clarify the chemical binding state of the carbonaceous Contamination layer on the surface of a dummy Si sphere.
