PERFORMANCE OF PARTIAL ARC HYDROSTATIC/HYBRID MULTIRECESS JOURNAL BEARINGS CONSIDERING WEAR

Abstract

Hydrostatic journal bearings are extensively used in machine tool industries and in heavily loaded and slow moving machines where the rotation speed is not enough to form full film lubrication. The bearing also has its own importance in the satisfactory functioning of the machinery in the form of reduction in wear between two parts in relative motion. In slow moving machinery, the hydrostatic journal bearing is employed to fulfil the requirement of the lubrication between rotor and the outer casing. 1-lydrostatics bearings utilize an external source to force lubricant into the bearing clearance space. 1-lydrostatic bearing can be used to support a loaded shaft for both rotational and reciprocating motion. A full 3600 journal bearing is unnecessary when applied load is unidirectional and a partial bearing may be used in such cases. The main objective of the present work is performance analysis of capillary compensated partial hydrostatic/hybrid journal bearing (I 80) considering wear. The Reynolds equation is solved using FEM in order to calculate fluid film pressure in bearing clearance space. To calculate equilibrium position ofjournal ccntre position. Newton-Raphson method is used. The solution procedure for the analysis of capi I far)' corn pensated partial hydrostatic/hybrid journal bearing is transformed into the source code in For/ran 77. The numerically simulated results are presented in the form of static performance characteristics such as bearing flow, maximum fluid film pressure and minimum fluid film thickness as well as the dynamic performance characteristics such as fluid film stiffIicss and damping coefficients. As we know that when two part of machinery are in relative motion, parts experience wear due to relative motion and this wear may lead to failure of parts. So the result of present work will be of importance in such cases where machinery parts, which are in relative motion, fails due to wear.