Seismic induced nonlinear rotor-bearing-casing interaction of rotating nuclear components
Authors:
Choy, F.K.
Padovan, J.
Li, W.H.
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| Abstract: The study of the dynamics of turbomachinery during seismic events has been of continuous interest to both researchers and designers of large rotating equipment.^Failure in such equipment, especially those associated with nuclear power generation, can lead to catastrophic consequences.^Hence, there is a general trend for corporations to overdesign the equipment without any indepth understanding of the dynamical performance of the machine under extreme operating conditions.^The overall objective of this paper are fourfold, namely: (1) To study the nonlinear dynamics of rotor-bearing casing system during rub interactions; (2) To examine the effects of suddenly induced imbalance and base motion in the global dynamical behavior of the system; (3) To develop engineering insights through the modal parameters in both time and frequency domain; (4) To generate signature analysis on rub forces for pattern recognition.^These goals are achieved through the development of a modal impact model.^Accuracy and efficiency of this transient model are maintained using a self-adaptive integration scheme. |
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