BEARING ATTENUATION

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Abstract
The purpose of this report is to analyze the stiffness and damping properties of fluid film journal bearings and to determine the force transmitted to the bearing support. The reslts are presented in practical design charts and are given in dimensionless form to make them applicable to wide ranges of geometrically and dynamically and dynamically similar units. The anal ysis assumes that the rotor vibrations are of small amplitude. Thereby the non-linear oil film force is replaced by gradients, denoted spring and damping coefficients. The numerical values of these coefficients are obtained by computer calculations. Results are given for 3 bearing types: the plain cylindrical, the 4-axial groove and the elliptical bearing. Using these bearings to support a symmetrical two-bearing rotor the force transmitted to the bearing pedestals, due to a rotor imbalance, is calculated. Thus the bearings can be compared for a given rotor and for know operating conditions and the bearing with the optimum force attenuation can be selected.

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