Experimental Investigations on the Dynamic Characteristics of a Rub-Impact Rotor System

For the rub-impact malfunction occurred often in rotating machinery, experimental investigations of the dynamic characteristics of the system were performed under three different conditions with different configurations of the rotor system and different unbalances. It is found that when the rub-impact occurs in the rotor system, the obvious feature of impact and turn back in the orbits and the clear truncations in the waveforms can be found. The vibration spectrum includes not only the synchronous component but also the higher harmonic components. These characteristics can provide the basis for the accurate diagnosis of the rub-impact fault of the rotor system.