One of the main problems in the development of the engine for a supersonic aerospace plane is the rotor vibration problem. Generally, the aerospace engine will be operated under rapid acceleration. Therefore, the rotor vibration characteristics is considered the unsteady vibration situation. In this study, we established a method to investigate the rotor vibration during the rapid acceleration by using steady-state rotordynamic analysis. From the 1st and 2nd critical speeds and these resonance amplitudes obtained from the results of the cold run tests, the vibration characteristics under assumed steady operation were investigated. Furthermore, it is presented the results of evaluating the rotor vibration behavior by conducting steady-state rotordynamic analysis.
