Abstract
A finite element dynamic model for a rotor-bearing system is developed. The model accounts for the gyroscopic moments and anisotropic bearings. For dynamic response analysis, a reduced order model using modal truncation is obtained. Two modal truncation schemes are invoked; one with planar (undamped) modes, and the other with complex (damped) modes. Both the modal characteristics and the dynamic responses of two rotor systems are evaluated using the two reduction schemes. Simulation results are presented to demonstrate the validity and accuracy of the reduced order form. The question of whether to use planar or complex modes in establishing the modal transformation is addressed.
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