Prediction of minimum film thickness is often used in practice for calculation of film\nparameter to design machine operation in full film regime. It was reported several times that majority\nof prediction formulas cannot match experimental data in terms of minimum film thickness. These\nstandard prediction formulas give almost constant ratio between central and minimum film thickness\nwhile numerical calculations show ratio which spans from 1 to more than 3 depending on M and L\nparameters. In this paper, an analytical formula of this ratio is presented for lubricants with various\npressureâ??viscosity coefficients. The analytical formula is compared with optical interferometry\nmeasurements and differences are discussed. It allows better prediction, compared to standard\nformulas, of minimum film thickness for wide range of M and L parameters.
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