Volume 37 Issue 4
Apr.  2022
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Article Navigation >  Journal of Aerospace Power  > 2022  >  37(4): 711-720
WEI Daitong, CHEN Xing, CHEN Yugang, LI Hongkun. Reduced order method of blade rubbing system based on proper orthogonal decomposition[J]. Journal of Aerospace Power, 2022, 37(4): 711-720. doi: 10.13224/j.cnki.jasp.20210180
Citation: WEI Daitong, CHEN Xing, CHEN Yugang, LI Hongkun. Reduced order method of blade rubbing system based on proper orthogonal decomposition[J]. Journal of Aerospace Power, 2022, 37(4): 711-720. doi: 10.13224/j.cnki.jasp.20210180
shu

Reduced order method of blade rubbing system based on proper orthogonal decomposition

doi: 10.13224/j.cnki.jasp.20210180

  • School of Mechanical Engineering，Dalian University of Technology，Dalian Liaoning 116024，China

  • Received Date: 2021-04-20
  • Publish Date: 2022-04-28
    Abstract
  • In view of the problem of blade rubbing response，a proper orthogonal decomposition method was proposed to reduce the dynamic order of the system.The projection space was generated by the proper orthogonal decomposition of the snapshot matrix，the system dynamic equation was projected into the subspace for model reduction，and the rubbing response was solved in combination with the numerical integration method.Based on the reduced order model，the blade rub impact response under different speed and penetration parameters was analyzed and compared with the full order model.The results showed that the time-domain response deviation of the reduced order model was less than 5%，and the computational efficiency of the reduced order model was improved by 98.4%.The robustness of the reduced order model was verified by changing the blade speed and penetration.With the increase of rotational speed and penetration，it was found that the energy of the proper orthogonal modes transferred between the lower order and the higher order，and presented different transfer laws.There was a certain relationship between the modal energy transfer caused by the rotational speed and the natural frequency of the structure.The method and conclusion can provide a basis for blade rub impact analysis and fault diagnosis.

     

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