Abstract
The stability of a single mass flexible rotor supported on three axial groove bearings was tested under a wide bearing load range. Running tests and impulse tests were performed under the bearing load which was controlled by electromagnets arranged at the center of bearing span. The linearized dynamic coefficients of bearing were calculated by considering hydrostatic effects of supplied oil pressure. And it was shown that the hydrostatic pressure decreases instability threshold speeds considerable. The experimental and calculated results were in a good agreement for high bearing loads, however, in a moderate agreement for light bearing loads. The experimental results also showed that the unbalance force decreases onset speeds of instability and the impulse force induces unsteady large vibrations of nearly half whirl of rotating speed.
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