Abstract
High speed rotors in jet engines or turbopumps used in space vehicles are mostly operated at supercritical speeds, and their bearings and housings are usually supported resiliently from the frame in order to reduce critical speeds. However, when the aircraft or the space vehicle turns or responds to disturbances, the rotor may contact the casing due to vibration caused by gyroscopic moment. In this paper, a dynamic analysis is performed of the vibration of a mechanical system subjected to a pitching motion of the frame. The flexibility and the mass of bearing housings are taken into account and the axis of the pitching motion is assumed to be distant from the center of gravity of the rotor. The usefulness of the modelling and the validity of the computational programs are demonstrated by comparison with the experimental results obtained by using a model rotor. The dynamic response of the system in the case of a turning motion is also calculated.
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