Abstract
Two types of dynamic problem have to be overcome in rotor bearing systems. The first relates to instability arising from the bearing characteristics, sometimes in conjunction with destabilizing influences such as rotating damping or aerodynamic mechanisms. The second problem is the sensitivity of the system to forcing, in particular that arising from unbalance. In orthodox bearing designs these two requirements are incompatible. One way of modifying the dynamic characteristics of hydrodynamic bearings is to introduce either axial or circumferential grooving. A grooving strategy is proposed which overcomes some of the inherent limitations of existing bearing designs and enables improvements in both stability and sensitivity to be made. Theoretical predictions are confirmed experimentally on a 355 mm diameter bearing.
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