Experiment on the characteristics of torsional vibration of rotor-to-stator rub in turbomachinery

摘要

By use of the DK-II torsional vibration measuring system, the characteristics of torsional vibration of a rotor with rotor-to-stator rub are studied. It can be concluded that the measured natural torsional frequency (f{sub}(rub)) with rub is higher than the one (f{sub}(ori)) without rub. When rub happens, if the rotating frequency is higher than f{sub}(rub) torsional vibrations with a measured natural torsional frequency (f{sub}(rub)) and 1×, 2× are excited; if the rotating frequency is between f{sub}(rub) and f{sub}(ori), the torsional vibration which is so called resonance (one-time rotating frequency) is excited; if the rotating frequency is lower than f{sub}(ori) torsional vibrations with one-time rotating frequency and f{sub}(rub) are excited, and a small torsional vibration with 2× is excited too.