Influence of rotor’s radial rub-impact on imbalance responses

The response of rotor’s mass imbalance is synchronous vibration proportional to mass, mass eccentricity, and the square of rotating speed. But in the presence of rotor’s radial rub-impact, it does not keep this property. It is observed from numerical simulations of rotor’s radial rub-impact that the magnitude of imbalance response in power spectrum is affected by rotor’s radial rub-impact. In the absence of radial rub-impact, the magnitudes of both lateral and torsional responses maintain constant. But in the presence of radial rub-impact, the magnitude of lateral response goes down all the way to a bottom while that of torsional response goes up all the way to a roof, as radial rub-impact grows strong. These properties can be used for the diagnostics of rotor’s radial rub-impacts.