Nonlinear response analysis for an aero engine dual-rotor system coupled by the inter-shaft bearing

  • Zhenyong Lu
  • Xiaodong Wang
  • Lei HouEmail author
  • Yushu Chen
  • Xiyu Liu


This paper focuses on the nonlinear response characteristics of an aero engine dual-rotor system coupled by the cylindrical roller inter-shaft bearing. The motion equations of the system are formulated considering the unbalance excitations of the two rotors, vertical constant forces acting on the rotor system and the gravities. By using numerical calculation method, the motion equations are solved to obtain the nonlinear responses of the dual-rotor system. Accordingly, complex nonlinearities affected by the bearing radical clearance, the vertical constant force and the rotating speed ratio are discussed in detail. The jump phenomenon, hard resonant hysteresis characteristics are shown for a relatively large bearing clearance, and the soft resonant hysteresis characteristics can be observed for a relatively large vertical constant force. Moreover, the super-harmonic frequency components and the combined frequency components caused by the inter-shaft bearing are observed for both rotors. But the corresponding frequency components for the low-pressure rotor are more complex than that for the high-pressure rotor in same condition. These results would be helpful to recognize the nonlinear dynamic characteristics of dual-rotor bearing system.


Dual-rotor system Inter-shaft bearing Super-harmonic responses Hertz contact Vertical constant force 



The authors would like to acknowledge the financial supports from the Shandong Province Natural Science Foundation, China (Grant ZR2018QA005, ZR2016AP06), National Key Basic Research Program (973 Program) of China (Grant No. 2015CB057400) and China Postdoctoral Science Foundation (Grant No. 2017M622259).


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Zhenyong Lu
    • 1
  • Xiaodong Wang
    • 1
  • Lei Hou
    • 2
    Email author
  • Yushu Chen
    • 2
  • Xiyu Liu
    • 1
  1. 1.School of Management Science and EngineeringShandong Normal UniversityJi’nanPeople’s Republic of China
  2. 2.School of AstronauticsHarbin Institute of TechnologyHarbinPeople’s Republic of China

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