Effect of Bio Lubricants on the Dynamic Performance of Rotor Bearing System: A Mathematical Model

Experimental and Numerical Investigation of Static and Dynamic Characteristics of Bio-Oils and SAE40 in Fluid Film Journal Bearing

“…The nonlinear fluid film forces generated by the journal bearing may be derived by considering the solution to the Reynolds equation. The Reynolds equation for laminar, iso-viscous, and iso-thermal flow may be written as [ 5 ]: where h is the film thickness, p is the pressure developed in the film, and η is the oil film viscosity. Similarly, another important parameter to define a bearing that combines speed and load effects is often termed as the bearing characteristic number or the Sommerfeld number S : where η is the viscosity of the lubricant, N is the speed of shaft rotation, D is the diameter of the bearing, L is the bearing length, W is the applied load, R is the shaft radius, and C is the radial clearance.…”

“…Previously, the evaluation was carried out using the traditional mineral-based lubricants. The development of a mathematical model for the performance evaluation of a journal bearing using bio-lubricants would provide new horizons in terms of bio-lubricants research [ 5 ]. In the numerical analysis of journal bearing dynamic characteristics based on CFD, the results show that the film stiffness coefficient increases with the rotational speed, and the speed has little effect on the damping coefficient [ 6 ].…”