The typical Reynolds equation of journal bearing assumes that the journal and bearing surfaces are smooth, which inevitably leads to an estimation bias due to overlooking the surface topography of the journal and bearing. To this end, a modified Reynolds equation is established by taking into consideration the effect of the reconstructed rough surface. The influence of the non-Gaussian rough surface performance parameters on journal-bearing characteristics is investigated from steady-state and dynamic perspectives. The results indicate that the steady-state and dynamic performances of journal bearing with surface roughness are better than that of journal bearing with smooth surfaces. The oil film pressure, load-carrying capacity, stiffness coefficient, and damping coefficient are inversely correlated with skewness and positively correlated with kurtosis.
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