Volume 28 Issue 12
Dec.  2013
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Article Contents
JIANG Yun-fan, LIAO Ming-fu, LIU Yong-quan, WANG De-you, JIN Lu, LU Peng. Dynamic characteristics of co-rotating/counter-rotating dual-rotor system[J]. Journal of Aerospace Power, 2013, 28(12): 2771-2780.
Citation: JIANG Yun-fan, LIAO Ming-fu, LIU Yong-quan, WANG De-you, JIN Lu, LU Peng. Dynamic characteristics of co-rotating/counter-rotating dual-rotor system[J]. Journal of Aerospace Power, 2013, 28(12): 2771-2780.

Dynamic characteristics of co-rotating/counter-rotating dual-rotor system

  • Received Date: 2012-11-15
  • Publish Date: 2013-12-28
  • A dynamic model of dual-rotor was set up.The influence of inter-shaft bearing stiffness and the gyroscopic moments of high and low pressure rotors were considered in this model.The difference of co-rotating or counter-rotating dual-rotor's critical speed characteristics and unbalance response and the influence of speed ratio on co-rotating or counter-rotating dual-rotor's critical speed characteristics and unbalance response were revealed by numerical analysis and experiments.The results show that,gyroscopic moment is a main influential factor to the rotor stiffness of dual-rotor system with inter-shaft bearing,and the changes of stiffness are related to the speed ratio and the relative rotating direction of inner and outer rotors,further causing the change of co-rotating or counter-rotating dual-rotor's critical speed characteristics and unbalance response.Compared with the co-rotating dual-rotor of the same structure with the counter-rotating dual-rotor,the counter-rotating dual-rotor's unbalance response is more obvious than the co-rotating dual-rotor's under the same unbalance mass,and for this reason the unbalance mass of counter-rotating dual-rotor's inner and outer rotors should be controlled more strictly during the dynamic balance.

     

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