旋转失速激振力作用下航空发动机转子振动特性

为分析转子系统在压气机旋转失速故障作用下的横向振动，针对某型航空发动机转子系统，根据Mansoux模型推导了旋转失速下的压力、流量脉动响应及旋转失速横向激励力模型，并结合不平衡力、碰摩力模型，建立了航空发动机转子系统的动力学模型.仿真计算了不同工况下旋转失速激振力对转子系统振动响应，通过轴心轨迹图、频谱图、Poincare图、Bode图分析了旋转失速激振力对转子系统稳定性的影响.结果表明:旋转失速引起压气机转子强烈的非线性振动，并主要是低频振动.研究成果可为航空发动机设计和振动监测提供技术支持. 

Aeroengine rotor system vibration characteristics under action of rotating stall transverse load

To analyze the transverse vibration in rotor system caused by rotating-stall, a dynamical rotor system model with the transverse load by the fluctuation of pressure and flow coefficient was proposed by Mansoux model coupling with unbalance and rubbing load. Numerical calculation technology was used to investigate the vibration characteristics of rotor system under the conditions with/without the action of transverse load respectively. Furthermore, the influence of transverse load on the stability of rotor system was analyzed by axes contrails, spectrogram, Poincare figures and Bode figures at the same time. It indicates that the vibration of compressor caused by stall is nonlinear and mainly dominated by low frequency. This provides a certain theoretical basis and methods for reference for the aircraft engine design and vibration monitoring.