Effect of constant maneuver load on vibration characteristics of aero-engine's rotor system

An asymmetric placed Jeffcott rotor system with nonlinear elastic support was considered, and the influences of constant maneuver load on the dynamics of the rotor system were studied numerically. By setting different constant maneuver loads, it was found that the relationship between the amplitude and the excitation frequency may lead to different phenomenons including: hysteresis region narrowing, disappearance and secondary jump. With the variation of the frequency ratio, the relationship between the amplitude and the constant maneuver load is changed significantly. Under certain excitation frequency, if the constant maneuver load crosses a critical value, the amplitude of the system can jump from a small level to a large one, and not drop down even though the load is reduced to zero. In addition, the offset of the rotor's axis is not closely related to the excitation frequency, but mainly depended on the amount of the constant maneuver load.