Abstract
An experimental investigation is carried out to study the unbalanced whirl of herring-bone grooved gas journal bearings. The unbalanced whirls of both the cylindrical mode and the conical mode are measured individually by arranging the gap sensors at the appropriate positions along the rotor, and the relation of rotating frequency and whirl frequency is shown by measuring the acceleration of the bearing. These experimental results are compared with the theoretical predictions. This paper also describes the influence of the rotor centrifugal expansion on the whirl characteristics.
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