Abstract:An analytical model for fluid film forces of hydrodynamic journal bearing was proposed.Based on the Sommerfeld boundary condition,the second order differential Reynolds equation and the integral of fluid film pressure were analyzed by using the separation of variables method,and the analytical expression of oil film force was obtained.Taking circular pit texture bearing as an example,the oil film force was calculated,and the effects of textured parameters on oil film pressure were analyzed.The results show that the bearings with surface texture in convergent region (boost region) have better lubrication and loadbearing performance than the bearings with surface texture in divergent region (decompression region),the full texture bearings and the smooth bearings.The calculation results of the proposed analytical model were compared with those of the FDM and CFD models under different aspect ratios and eccentricities.It is found that the proposed analytical model can accurately describe the oil film force of surface textured hydrodynamic journal bearings,and the calculation results are basically consistent with those of FDM and CFD models,which verifies the correctness and effectiveness of the model.