마모 형상에 따른 3-로브 베어링 성능 해석 = Performance Predictions of a 3-Lobe Bearing for Various Wear Configuration

다국어 초록 (Multilingual Abstract)

Frequent starts and stops, or operation with oil debris larger than the local film thickness, cause contact within the bearing and result in wear. Such wear significantly affects bearing performance. This study predicts the static and dynamic performance of a worn 3-lobe bearing for various wear depths and radii. The model currently solves the Reynolds equation for an isothermal, isoviscous, and incompressible fluid to calculate film pressure using the finite-volume method, after determining the journal center location via the Newton-Raphson method. The bearing considered has a diameter of 40 mm and a length of 20 mm, operating at a rotational speed of 4000 rpm and across a Sommerfeld number range of 0.05 to 5. The maximum wear depth ranges from 0.1 to 0.5 times the lobe clearance, while the wear radius is equal to or greater than the journal radius. Static performance predictions indicate that wear decreases the attitude angle and power loss, and in some cases, increases the minimum film thickness despite increased eccentricity. Dynamic performance predictions show that wear reduces the direct stiffness (KXX) and damping (CYY) coefficients, while increasing the cross-coupling damping coefficients (CXY and CYX). However, when the wear radius equals the journal radius, the predictions exhibit different trends, likely due to difficulty in entering the worn region.