Abstract
Appropriately designed squeeze-film dampers can act as excellent vibration isolators for unbalanced rigid rotors. This paper presents the steady-state vibration amplitude and unbalance transmissibility data over a wide range of operating conditions for both unloaded vertical and centrally preloaded rigid rotors mounted in either one or two squeeze-film-supported rolling-element bearings. The use of this data to ensure effective vibration isolation consonant with acceptable rotor vibrations is discussed. It is shown that with un-pressurized bearings, undesirable bistable operation can be avoided; significant vibration isolation is possible up to a limited degree of unbalance; and there is no need for external support for unloaded vertical rotors. With fully pressurized bearings, such support is essential, but bistable operation is eliminated and vibration isolation is possible for any degree of unbalance, though effectiveness decreases with increasing unbalance.
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