Rotordynamic Analysis of an Oil-Free Turbocharger Supported on Lobed Gas Foil Bearings-Predictions versus Test Data

Title
Rotordynamic Analysis of an Oil-Free Turbocharger Supported on Lobed Gas Foil Bearings-Predictions versus Test Data
Authors
심규호이용복김태호
Keywords
터보챠져; 로브 베어링; 공기포일 베어링; Gas Foil Bearing; Lobe Bearing; Oil-Free Turbocharger; Rotordynamic Analysi; Rotordynamic Stability
Issue Date
2014-09
Publisher
TRIBOLOGY TRANSACTIONS
Citation
VOL 57, NO 6, 1086-1095
Abstract
This article presents the predictions of the rotordynamic performance of oil-free turbochargers (TCs) for various lobed gas foil bearings (GFBs) with the first-generation bump-type configuration and compares these predictions to the measured test data reported earlier. The three-lobed GFBs used for the simulations have increased bearing clearances and mechanical preloads with a fixed minimum bearing clearance, thus yielding larger average bearing clearances and higher wedge effects at the same time. The engine-induced TC housing excitation is found to have no influence on the critical speeds and damping ratios of the rotor rigid modes. The synchronous and asynchronous GFB analyses imply decreases in destabilizing forces for the highly lobed GFBs. The predicted critical speed and damping ratio of the TC rotor supported on the lobed GFBs demonstrate increasing system natural frequency and enhanced rotordynamic stability with increasing mechanical preload. The rotordynamic and bearing analyses of the lobed GFBs validate the beneficial effects of the mechanical preload on the rotordynamic stability of GFBs even with an increased average bearing clearance, which leads to a decreased bearing friction torque as well.
URI
http://pubs.kist.re.kr/handle/201004/48127
ISSN
10402004
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE