复杂转子系统支点动载荷模型及其优化设计

Aimed at the bearing dynamic load vibration response and optimal design of a complex rotor system with inter-shaft bearing in a turbofan engine with high thrust-to-weight ratio, a mechanical model of bearing dynamic loads is established to study the effects of unbalance, bending deformation and inertia moment under different rotational speeds. The variation trend of the bearing dynamic loads of a dual-rotor system with rotating speeds is calculated and analyzed. The relationship between the dynamic load of inter-shaft bearing and rotor bending deformation as well as inertial loads is revealed. An optimal design method for the vibration response of the inter-shaft bearing based on the slope control of the elastic curves of the rotors is proposed. The results show that by optimizing the rear journal structure of the high pressure turbine and adjusting the rear bearing of the low pressure turbine near the inter-shaft bearing, the dynamic load of the inter-shaft bearing and the sensitivity of the unbalance can be effectively reduced, which provides a theoretical method for the optimal design of the bearing vibration response of a complex rotor system with inter-shaft bearing.