Abstract
AbstractThe internal turbulent boundary layer (TBL) excitation of journal bearings is a significant excitation source to induce random vibration. The random vibration characteristics of journal bearings excited by internal turbulent boundary layer were investigated based on the wavenumber domain modal summation. The generalized Corcos model with wall pressure fluctuations (WPF) was used to consider the spectral characteristics at low Mach speed and the effect of pressure gradient, and the correctness of the numerical results was verified by experimental analysis. Results indicate that the convective wavenumber is far greater than the structural bending wavenumber at low Mach number flows and the effect of convective wavenumber on the vibration response of the structure could be neglected. The pressure level in the low wavenumber region is the major excitation source of the structural vibration. Lower lubricant viscosities and higher journal speeds will increase the excitation intensity of wall pressure pulsations and thus increase the amplitude of the modal response of bearing in the high frequency range.KeywordsJournal bearingsTurbulent boundary layerWall pressure fluctuationRandom vibration
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