Research on Wall Pressure Fluctuation Effects in Turbulent Lubrication Journal Bearings
Wall pressure fluctuation is one of the major excitation sources of random vibration in turbulent lubrication journal bearings.Establishing the correlation between turbulent excitation characteristics and the dynamic response of jour-nal bearings is significant for condition monitoring and fault diagnosis of high speeds,low viscosity lubrication journal bear-ings.In order to study the wall pressure fluctuation effects in turbulent lubrication journal bearings,the influence of adverse pressure gradients in the fluid film was considered,Rozenberg model and Generalized Corcos model were used to character-ize the auto-power and cross-power spectrum density of wall pressure fluctuation,the turbulent wall pressure fluctuation model was solved by the modal summation method in wavenumber domain to study the excitation characteristics of wall pressure fluctuation and the dynamic response of journal bearings under different operating conditions.The results show that turbulent wall pressure fluctuation in low wavenumber region is the main factor in the high frequency random vibration of journal bearings.As the viscosity of the lubricating oil decreases,the modal response amplitude of the bearing in the high-frequency range increases,and a wider frequency band and higher amplitude are generated near the resonance peak.As the shaft neck speed and radial load increase,the turbulent pressure gradient increases,and the modal response amplitude of the bearing in the high-frequency range also increases.
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