能量轨道下带碰摩的双转子系统振动特性分析

Analyses of vibration characteristics of a dual-rotor system with rubbing faults based on energy tracks

为提高航空发动机的推重比和燃油效率,调整转子与机壳间的间隙变小,易发生碰摩故障问题,本文针对带碰摩双转子系统的非线性振动特性开展了定性、定量分析。建立了具有非线性弹簧特性和带碰摩故障双转子系统的非线性数学模型,通过仿真与数值分析调查了该模型复杂的碰撞、振动特性。对碰摩故障发生后和即将脱离时该系统的能量交换进行了定量分析,基于振动能量轨道的迁移过程分析了非线性振动特征和诱发机理。使用转子实验验证了数值仿真、理论分析结果和振动能量轨道。本文揭示了带碰摩故障的非线性双转子系统运行时振动变化规律,更好地分析了双转子系统的振动特征。

To enhance the thrust-to-weight ratio and fuel efficiency of an aero-engine,the clearance between the rotor and the casing is reduced,increasing the likelihood of rubbing faults.This paper investigates the vibration characteristics of a dual-rotor system experiencing rubbing.According to the characteristics of nonlinear springs in rotor supports and rubbing faults,a nonlinear dual-rotor model with rubbing faults is initially constructed.The nonlinear vibration characteristics of the system are then analyzed using nonlinear vibration theory.Simulations are conducted to examine the changes in vibration energy after the occurrence of rubbing faults and to determine when the system will leave the rubbing state,utilizing nonlinear energy supply functions.The characteristics of nonlinear vibration and their inducing mechanism are analyzed based on the transfer process of vibration energy tracks.The research demonstrates that the rotor experiment aligns closely with the value simulations,theoretical analysis results,and vibration energy tracks.Additionally,the study reveals the change in vibration patterns when the nonlinear dual-rotor system operates and further analyzes the vibration characteristics of the dual-rotor system.