Applied Mathematics and Mechanics

, Volume 33, Issue 4, pp 499-510

First online:

Research on 1:2 subharmonic resonance and bifurcation of nonlinear rotor-seal system

  • Zhong-gang Li李忠刚Affiliated withSchool of Astronautics, Harbin Institute of Technology Email author 
  • , Yu-shu Chen陈予恕Affiliated withSchool of Astronautics, Harbin Institute of Technology

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The 1:2 subharmonic resonance of the labyrinth seals-rotor system is investigated, where the low-frequency vibration of steam turbines can be caused by the gas exciting force. The empirical parameters of gas exciting force of the Muszynska model are obtained by using the results of computational fluid dynamics (CFD). Based on the multiple scale method, the 1:2 subharmonic resonance response of the dynamic system is gained by truncating the system with three orders. The transition sets and the local bifurcations diagrams of the dynamics system are presented by employing the singular theory analysis. Meanwhile, the existence conditions of subharmonic resonance non-zero solutions of the dynamic system are obtained, which provides a new theoretical basis in recognizing and protecting the rotor from the subharmonic resonant failure in the turbine machinery.

Key words

rotor-seal 1:2 subharmonic resonance flow field computation gas flow exciting force singularity

Chinese Library Classification

O322 TH133

2010 Mathematics Subject Classification