L. Lunde et K. Tonder, NUMERICAL-SIMULATION OF THE EFFECTS OF 3-DIMENSIONAL ROUGHNESS ON HYDRODYNAMIC LUBRICATION - CORRELATION-COEFFICIENTS, Journal of tribology, 119(2), 1997, pp. 315-322
Numerical simulations of the lubrication of rough surfaces have been d
one using the Finite Element Method. Only pure pressure flow condition
s have been considered. The correlation coefficient between pressure a
nd height, pressure and height gradients etc. are presented for two di
fferent isotropic surfaces. For comparison, one slightly anisotropic s
urface and one surface with pure transverse roughness have also been i
nvestigated The three-dimensional surface roughnesses have been produc
ed numerically using Finite Impulse Response (FIR)filters and FFT. The
only two significant correlations are between the pressure and the he
ight gradient in x-direction and between the height and the pressure g
radient in x-direction. The correlation coefficients can be used to ap
ply better boundary conditions when analyzing the lubrication of a rou
gh bearing, and how this can be done has been roughly explained.