The Experts below are selected from a list of 7860 Experts worldwide ranked by ideXlab platform

Daning Zhou - One of the best experts on this subject based on the ideXlab platform.

  • nonlinear dynamic modeling of rotor system supported by angular contact ball bearings
    Mechanical Systems and Signal Processing, 2017
    Co-Authors: Hong Wang, Qinkai Han, Daning Zhou
    Abstract:

    Abstract In current bearing dynamic models, the Displacement Coordinate relations are usually utilized to approximately obtain the contact deformations between the rolling element and raceways, and then the nonlinear restoring forces of the rolling bearing could be calculated accordingly. Although the calculation efficiency is relatively higher, the accuracy is lower as the contact deformations should be solved through iterative analysis. Thus, an improved nonlinear dynamic model is presented in this paper. Considering the preload condition, surface waviness, Hertz contact and elastohydrodynamic lubrication, load distribution analysis is solved iteratively to more accurately obtain the contact deformations and angles between the rolling balls and raceways. The bearing restoring forces are then obtained through iteratively solving the load distribution equations at every time step. Dynamic tests upon a typical rotor system supported by two angular contact ball bearings are conducted to verify the model. Through comparisons, the differences between the nonlinear dynamic model and current models are also pointed out. The effects of axial preload, rotor eccentricity and inner/outer waviness amplitudes on the dynamic response are discussed in detail.

Hong Wang - One of the best experts on this subject based on the ideXlab platform.

  • nonlinear dynamic modeling of rotor system supported by angular contact ball bearings
    Mechanical Systems and Signal Processing, 2017
    Co-Authors: Hong Wang, Qinkai Han, Daning Zhou
    Abstract:

    Abstract In current bearing dynamic models, the Displacement Coordinate relations are usually utilized to approximately obtain the contact deformations between the rolling element and raceways, and then the nonlinear restoring forces of the rolling bearing could be calculated accordingly. Although the calculation efficiency is relatively higher, the accuracy is lower as the contact deformations should be solved through iterative analysis. Thus, an improved nonlinear dynamic model is presented in this paper. Considering the preload condition, surface waviness, Hertz contact and elastohydrodynamic lubrication, load distribution analysis is solved iteratively to more accurately obtain the contact deformations and angles between the rolling balls and raceways. The bearing restoring forces are then obtained through iteratively solving the load distribution equations at every time step. Dynamic tests upon a typical rotor system supported by two angular contact ball bearings are conducted to verify the model. Through comparisons, the differences between the nonlinear dynamic model and current models are also pointed out. The effects of axial preload, rotor eccentricity and inner/outer waviness amplitudes on the dynamic response are discussed in detail.

Pascal Morin - One of the best experts on this subject based on the ideXlab platform.

  • Mapping potential energy surfaces by core electron excitation : the resonant Auger decay spectrum of BF3
    Chemical Physics Letters, 2002
    Co-Authors: C. Miron, R. Feifel, O. Björneholm, S. Svensson, A. Naves De Brito, S.l. Sorensen, M.n. Piancastelli, M. Simon, Pascal Morin
    Abstract:

    High-resolution electron spectroscopy applied under resonant Auger-Raman conditions is shown to be a powerful tool for characterizing complex potential energy surfaces of core-excited states in polyatomic systems. BF3 is used as a prototype molecule: excitation of the B1s →2a2″ transition leads to an exceptional out-of-plane vibrational excitation resolved over a wide energy range (3.6 eV). The photon energy dependence of the spectra through the resonance profile is rationalized in the frame of the relative slopes of the potential energy curves along the boron out-of-plane Displacement Coordinate.

Qinkai Han - One of the best experts on this subject based on the ideXlab platform.

  • nonlinear dynamic modeling of rotor system supported by angular contact ball bearings
    Mechanical Systems and Signal Processing, 2017
    Co-Authors: Hong Wang, Qinkai Han, Daning Zhou
    Abstract:

    Abstract In current bearing dynamic models, the Displacement Coordinate relations are usually utilized to approximately obtain the contact deformations between the rolling element and raceways, and then the nonlinear restoring forces of the rolling bearing could be calculated accordingly. Although the calculation efficiency is relatively higher, the accuracy is lower as the contact deformations should be solved through iterative analysis. Thus, an improved nonlinear dynamic model is presented in this paper. Considering the preload condition, surface waviness, Hertz contact and elastohydrodynamic lubrication, load distribution analysis is solved iteratively to more accurately obtain the contact deformations and angles between the rolling balls and raceways. The bearing restoring forces are then obtained through iteratively solving the load distribution equations at every time step. Dynamic tests upon a typical rotor system supported by two angular contact ball bearings are conducted to verify the model. Through comparisons, the differences between the nonlinear dynamic model and current models are also pointed out. The effects of axial preload, rotor eccentricity and inner/outer waviness amplitudes on the dynamic response are discussed in detail.

C. Miron - One of the best experts on this subject based on the ideXlab platform.

  • Mapping potential energy surfaces by core electron excitation : the resonant Auger decay spectrum of BF3
    Chemical Physics Letters, 2002
    Co-Authors: C. Miron, R. Feifel, O. Björneholm, S. Svensson, A. Naves De Brito, S.l. Sorensen, M.n. Piancastelli, M. Simon, Pascal Morin
    Abstract:

    High-resolution electron spectroscopy applied under resonant Auger-Raman conditions is shown to be a powerful tool for characterizing complex potential energy surfaces of core-excited states in polyatomic systems. BF3 is used as a prototype molecule: excitation of the B1s →2a2″ transition leads to an exceptional out-of-plane vibrational excitation resolved over a wide energy range (3.6 eV). The photon energy dependence of the spectra through the resonance profile is rationalized in the frame of the relative slopes of the potential energy curves along the boron out-of-plane Displacement Coordinate.