The purpose of this paper is to establish a theoretical model to represent a sealed squeeze-film damper bearing and to assess it against results from a test rig, simulating the essential features of a medium-sized gas turbine aero engine.
In this paper attention is given to empirically modelling the hydrodynamics of a tightly sealed squeeze-film bearing in a flexible support structure simulating an aero-engine assembly, with a view to assessing its damping performance. It is found that predictable experimental results are obtained by employing an end-leakage factor which relates the outlet pressure around the bearing circumference to the corresponding ‘long-bearing’ pressure. The present work complements that covered in an earlier paper (1), which was concerned with the performance of an open-ended or weakly sealed squeeze-film bearing in a similar support structure.
Squeeze-film damper bearings, when properly designed, are a simple means of curbing instabilities and reducing vibration in rotor-bearing assemblies. This paper describes vibration tests carried out on a rigid rotor — flexible bearing test rig incorporating a squeeze-film damper; comparisons are made with theoretical predictions.
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