Abstract

The thermal effects of rotor-to-stator rubbing resulting in rotor bowing, and subsequent changes in rotor vibrational responses are discussed in this paper. The rotor thermal bow is modeled following relationships quoted in rotordynamic literature. The rotor model takes into account its first lateral mode in which the rubbing spot differs from the modal mass location. It is shown that the rotor responds to the rub thermal effect in a “spiraling/oscillating” mode which represents a form of rotor self-exciting vibrations. A simplified model explains physical phenomena occurring in the rubbing rotor system. An example of the field data illustrates the rotor dynamic behavior.

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