Joint Effect of Imbalance and Supports Vibration on the Rotor Nonlinear Oscillations of Aircraft Device

In many devices and aggregates of aircrafts and other vehicles rotors are both sources of vibration and they are subjected to vibrational load from their supports. In this case, the disturbance load has a component with a frequency which is not a multiple with respect to the rotor speed. Here the method of analysis of forced oscillations of a rigid rotor on angular contact bearings with axial preload has been developed. The frequency responses of the system as well as orbits of spindle centers and Poincaré maps with the joint action of imbalance and supports vibration have been obtained. When the rotor rotational speed and the frequency of supports vibration are of the same order, the resonance and super-resonance oscillations in the main modes are realized. The dependence of resonance modes on the angle of contact of ball-bearings has been studied. This work is intended to improve the numerical analysis of the dynamics and design of structures in the aerospace industry and transport engineering.