Volume 36 Issue 12
Dec.  2021
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ZANG Tengfei, JIA Chenhui, ZHANG Luyao, SHI Dawei. Structural optimization and reliability analysis of hybrid dynamic pressure gas bearings[J]. Journal of Aerospace Power, 2021, 36(12): 2606-2620. doi: 10.13224/j.cnki.jasp.20200563
Citation: ZANG Tengfei, JIA Chenhui, ZHANG Luyao, SHI Dawei. Structural optimization and reliability analysis of hybrid dynamic pressure gas bearings[J]. Journal of Aerospace Power, 2021, 36(12): 2606-2620. doi: 10.13224/j.cnki.jasp.20200563
shu

Structural optimization and reliability analysis of hybrid dynamic pressure gas bearings

doi: 10.13224/j.cnki.jasp.20200563

  • School of Mechatronics Engineering，Henan University of Science and Technology，Luoyang Henan 471003，China

  • Received Date: 2020-12-29
  • Publish Date: 2021-12-28
    Abstract
  • By combining radial and thrust spiral groove dynamic pressure gas bearing，the lubrication analysis model of hybrid dynamic pressure gas bearing was established.The structure characteristics and lubrication mechanism of the mixed dynamic pressure gas bearing were expounded，and the dimensionless steady state Reynolds governing equation of the bearing was established.A hybrid dynamic pressure film pressure coupling calculation method was proposed，differential expression of gas film pressure was derived，boundary conditions were defined，and a numerical calculation method of gas film pressure distribution was constructed.The maximum radial bearing capacity was taken as the objective to optimize the structural parameters.Based on the optimal structural parameters，the finite element model of bearing gas film was established，and the radial stability variation law of bearing rotor system under different impact loads was analyzed using CFD，so as to study the dynamic characteristics and reliability of hybrid dynamic pressure gas bearing.The test bed of hybrid dynamic pressure gas bearing was built to verify the correctness of numerical calculation method and finite element simulation analysis.The results showed that the proposed pressure coupling calculation method can accurately calculate and analyze the steady-state gas film pressure distribution，gas film force and bearing capacity，and the finite element simulation can better simulate the dynamic flow field change，and also calculate and analyze the dynamic gas film force，dynamic characteristic coefficient and stability.The good bearing capacity and stability of the mixed gas bearing at high speed have strong impact resistance and reliability to unidirectional step force and unidirectional rectangular force.When the bearing performance and stiffness were optimized，the impact resistance and stability should be considered to improve the comprehensive performance of the hybrid gas bearing.

     

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