Abstract
This paper presents the various arrangements of grooving location of two-groove oil journal bearing for optimum performance. An attempt has been made to find out the effect of different configurations of two groove oil journal bearing by changing groove locations. Various groove angles that have been considered are 10°, 20°, and 30°. The Reynolds equation is solved numerically in a finite difference grid satisfying the appropriate boundary conditions. Determination of optimum performance is based on maximization of nondimensional load, flow coefficient, and mass parameter and minimization of friction variable using genetic algorithm. The results using genetic algorithm are compared with sequential quadratic programming (SQP). The two grooved bearings in general have grooves placed at diametrically opposite directions. However, the optimum groove locations, arrived at in the present work, are not diametrically opposite.
Highlights
Journal bearings are used extensively in rotating machines because of their low wear and good damping characteristics
Lin and Noah [5] used genetic algorithm to optimize the performance of a hydrodynamic journal bearing
Group-VII: Dn-Hz configuration: the left groove is (5∘ to 80∘) below the horizontal position, and the other groove is in horizontal position (Figure 8); groove position is varied at 5∘ interval (Figure 8)
Summary
Journal bearings are used extensively in rotating machines because of their low wear and good damping characteristics. A journal bearing fed by two axial grooves has a wide practical application due to its good load carrying capacity and ability to operate when reversal of shaft rotation occurs [1]. These bearing usually have the grooves positioned orthogonal to the predominant load direction. It has been anticipated that, if the bearing is loaded into the groove, its load carrying ability will be diminished, but the effect on hydrodynamic lubricant flow and power loss is not so obvious. If the positions of the grooves are arranged for carrying a relatively higher load, the likelihood of bearing instability reduces, since the journal will run more eccentrically. Hashimoto and Matsumoto [6] described the optimum design methodology for improving operating
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