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RESEARCH PAPERS: Gas Turbines: Structures and Dynamics

Experimental Investigation of Thermoelastic Deformation in Turbojet-Engine Bearings Under Maintenance Inspection

[+] Author and Article Information
A. J. Kochevar

Commodities, Engineering and Planning Branch, Oklahoma City Air Logistics Center, Tinker Air Force Base, OK 73145

C. W. Bert

School of Aerospace and Mechanical Engineering, The University of Oklahoma, Norman, OK 73019

J. Eng. Gas Turbines Power 117(2), 371-376 (Apr 01, 1995) (6 pages) doi:10.1115/1.2814104 History: Received November 12, 1993; Revised June 07, 1994; Online November 19, 2007

Abstract

The present investigation examined the vertical and horizontal thermoelastic changes in the outside diameter of a turbojet-engine roller bearing. Thermal loads were imparted to the bearing by the hands of a bearing technician during a rework operation. A worst-case analysis was examined by assuming a three-minute dwell time and diametrically symmetric thermal loading. Contact temperature was experimentally determined and used in conjunction with a numerical model to simulate thermal propagation throughout the bearing outer ring. Diametric deflection data, obtained using the contact temperature in conjunction with analytic and finite elements, have been shown for comparative purposes. Experimental diametric expansions of the bearing outer ring were determined and compared with the predicted results. Assuming a worst-case scenario, this investigation yielded vertical expansions in the bearing outer ring’s diameter, which would be problematic for some bearings during the rework operation; appropriate corrective action was discussed.

Copyright © 1995 by The American Society of Mechanical Engineers
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