SYNOPSIS Predicting the stability of rotating systems at intermediate and large whirl amplitudes is costly. This paper suggests a cheaper' approximate method based upon an overall energy balance.
By representing the force exerted on the bearings as combinations of constant forces and cyclically varying forces, the influence of bearing geometry, and other factors on the magnitude and direction of the energy flow between oil film and rotor for a complete cycle was investigated and found significant.
It is suggested that designers should check stability of intermediate or large amplitude whirls by an overall energy balance.
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