含有碰摩故障的多盘双转子系统动态特性

建立航空发动机双转子轴承系统的有限元模型，为考察碰摩特征对双转子系统的影响，在考虑转轴剪切效应、惯量分布效应、横向扭转以及系统结构的几何参数等重要影响因素的前提下考察碰摩故障对系统的影响.研究了碰摩间隙等参数变化时对双转子系统动态特性的影响规律.结果表明由于双转子本身结构和转速的影响，转子各处呈现非周期1运动.另外，由于碰摩影响，整个系统会出现非线性响应，但由于中介轴承的影响在无碰摩故障的转轴上非周期运动稍弱一些.中介轴承除了有耦合作用外，还起到了隔振的作用.

Dynamic Characteristics of Stator Rotor Interaction in Multi disks Dual rotor System

A finite element model of dual rotor system and the rotor/stator contact model were established to investigate the effects of rub impact. To make the results more accurate， the influences of shear， inertia distribution， lateral torsional and geometric parameters of the system were considered in the model. The dynamic response of dual rotor system to the varied contact gaps was studied. Results indicate that period 3 is present in most parts of the rotor due to the inherent property of the dual rotor system. Aperiodic motion is present in the whole system because of the effect of rubbing contact. Specifically， the aperiodic motion presented in the rotor without rubbing contact (inner rotor) is not obvious due to the inter shaft bearing. It is shown that the inter shaft bearing can not only couple the inner/outer rotor but isolate the vibration.