带中介轴承双转子系统“可容模态”优化设计及实验

In order to solve the problem that the dual-rotor system of aero-engine cannot avoid the critical speed，and improve the vibration tolerance of the dual-rotor system，according to the optimization design method for the workable mode of dual-rotor system with inter-shaft bearing，the similar model of a dual-rotor engine with inter-shaft bearing is used as the initial model for optimization design. Based on the optimization results，a dual-rotor test rig system was built. The accuracy，effectiveness，stability and reliability of the optimization design method for the workable mode of dual-rotor system with inter-shaft bearing were verified by modal test，response test，continuous variable speed experiment and long time resonance experiment. According to research findings，the maximum error of the critical speed between the experimental results and the calculation results of the dual-rotor test rig system is 3.06%，and the maximum error of the modal shape is 9.6%. The vibration amplitude is less than 50 μm at any speed even though the critical speed is frequently passed in the working range. The resonance experiments at the sixth critical speed are completed at no less than 3790s. The maximum tolerated amount of unbalance mass is 5.2 times the designed amount. The amplitude is stable，and the higher the tolerability evaluation function is，the higher the tolerance to resonance is. The results indicate that the established optimization design method of workable mode for aero-engine dual-rotor system with inter-shaft bearing is effective.