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Rotordynamic Analysis of a 5-Kilonewton Thrust Gas Turbine by Considering Bearing Dynamics

2011; American Institute of Aeronautics and Astronautics; Volume: 27; Issue: 2 Linguagem: Inglês

10.2514/1.b34104

1533-3876

Geraldo Creci, João Carlos Menezes, João Barbosa, Joao Aparecido Corra,

Gear and Bearing Dynamics Analysis

In this work, a full rotordynamic analysis is performed for a 5-kN thrust gas turbine while taking into account bearing stiffness and damping dynamics. The shaft of the studied single spool gas turbine is supported by a deep groove ball bearing and a squeeze film damper. The dynamic stiffness and damping coefficients of these two bearings are used in a finite element model belonging to a C-class formulation for the study of whirl speeds and unbalance responses. The first six modal orbits of the shaft are plotted at the most important frequencies, and a transient analysis is performed to simulate the transition of the system through resonance. As a result, the dynamic behavior of the studied rotor-bearing system is predicted, and vibration problems are avoided. A good agreement among the results could be verified in all numerical analyses.