Pai, Rammohan S and Rao, Srikanth D and Pai, Raghuvir B (2008) Non-linear transient analysis of five axial groove water lubricated journal bearing. In: International Conference on Advanced Tribology, ICAT 2004., December 1-3, National University of Singapore, Singapore.

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Abstract

The stability characteristics of five axial grooves water lubricated journal bearings are studied theoretically. These bearings can use the process fluid as the lubricant as in the case of feed water pumps. The process fluid (water) is fed from one end of the bearing, through the five axial grooves (groove angles may vary). A non–linear analysis of a rigid rotor supported on journal bearings under unidirectional constant load, unidirectional periodic load and variable rotating load is carried out. The time–dependent Reynolds equation in two dimensions for incompressible fluid is solved numerically by the finite difference method with a successive over relaxation scheme satisfying the Jakobsson-Floberg-Olsson boundary conditions, to obtain the hydrodynamic forces. Using these forces, the equations of motion are solved by the fourth–order Runge–Kutta method to predict the transient behavior of the rotor. The analysis gives the orbital trajectory within the clearance circle

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