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RESEARCH PAPERS: Gas Turbines: Structures and Dynamics

Transient Thermoelastohydrodynamic Study of Tilting-Pad Journal Bearings Under Dynamic Loading

[+] Author and Article Information
P. Monmousseau, M. Fillon, J. Frêne

Université de Poitiers, URA CNRS, Laboratoire de Mécanique des Solides, S.P.2M.I., BP 179, 86960 Futuroscope Cedex, France

J. Eng. Gas Turbines Power 120(2), 405-409 (Apr 01, 1998) (5 pages) doi:10.1115/1.2818137 History: Received February 01, 1997; Online November 19, 2007

Abstract

Nowadays, tilting-pad journal bearings are submitted to more and more severe operating conditions. The aim of this work is to study the thermal and mechanical behavior of the bearing during the transient period from an initial steady state to a final steady state (periodic). In order to study the behavior of this kind of bearing under dynamic loading (Fdyn ) due to a blade loss, a nonlinear analysis, including local thermal effects, realistic boundary conditions, and bearing solid deformations (TEHD analysis) is realized. After a comparison between theoretical results obtained with four models (ISO, ADI, THD, and TEHD) and experimental data under steady-state operating conditions (static load Ws ), the evolution of the main characteristics for three different cases of the dynamic load (Fdyn /Ws < 1, Fdyn /Ws = 1 and Fdyn/ /Ws > 1) is discussed. The influence of the transient period on the minimum film thickness, the maximum pressure, the maximum temperature, and the shaft orbit is presented. The final steady state is obtained a long time after the appearance of a dynamic load.

Copyright © 1998 by The American Society of Mechanical Engineers
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