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Dynamic properties of journal bearings were analysed when manufacturing tolerances existed. A methodology was proposed to predict journal bearing properties and to seek a relationship between the manufacturing tolerances and the dynamic coefficients. All the dynamic coefficients of journal bearings were investigated against Sommerfeld number and four types of standard tolerance grades in laminar flow regimes respectively. The results showed that manufacturing tolerances had a significant influence on the dynamic coefficients, especially the cross terms of both stiffness and damping coefficients. The more the magnitude of manufacturing tolerance grade is, the more variations of dynamic coefficients are. It is recommended to take the effect of tolerances on the dynamic performance of journal bearings on its design stage.

Effects of Manufacturing Tolerances on Dynamic Properties of Journal Bearings