Computer-Aided Design of Pocket Elliptical Journal Bearings, Part 1: Theory

Abstract

A computer-aided design procedure suitable for pocket elliptical journal bearings for turbomachineries is proposed. After the description of their geometry and manufacturing, the driving geometric parameters characteristic of the pocket bearing are identified together with the design variants that influence their choice, like supply groove layout and the axial size of the pocket. The concept of journal mobility plot, capable to ease the post-processing of results and useful in journal vibration monitoring, is adapted to pocket elliptical bearings and, in general, to non-circular bearings. The proposed design evaluation includes a calculation sequence involving geometric parameters, FEM simulation and the calculation of proper performance indicators, from which the global performance of the bearing is finally computed.

Experimental and Numerical Analysis of Torsional—Lateral Vibrations in Drive Lines Supported by Hydrodynamic Journal Bearings

“…Equations ( 14) and ( 15) are coupled non-linear equations solved together by means of the Newton-Raphson method at each time step. The boundaries of the journal mobility region are calculated according to the method explained in [38], which becomes essential for journal bearings designed to support actual shaft-lines.…”

Theoretical and experimental dynamics analysis of rotor-bearing system supported by elliptical bearings

“…So the elliptical bearing is usually used to support the low-pressure rotor system with large load and high stability in a steam turbine system. There are certain research studies on the ordinary elliptical bearings and pocket elliptical journal bearings (Liang et al, 2015;Stefani, 2013aStefani, , 2013bStefani, , 2014. The dynamic characteristics of the rotor system supported by the elliptical bearings are also studied (Miranda and Faria, 2012;Zhang et al, 2019aZhang et al, , 2019b).…”