Volume 33 Issue 11
Nov.  2018
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Vibration energy transmitting mechanism of ring-stiffened casing excited by rotor unbalance[J]. Journal of Aerospace Power, 2018, 33(11): 2585-2592. doi: 10.13224/j.cnki.jasp.2018.11.003
Citation: Vibration energy transmitting mechanism of ring-stiffened casing excited by rotor unbalance[J]. Journal of Aerospace Power, 2018, 33(11): 2585-2592. doi: 10.13224/j.cnki.jasp.2018.11.003

Vibration energy transmitting mechanism of ring-stiffened casing excited by rotor unbalance

doi: 10.13224/j.cnki.jasp.2018.11.003
  • Received Date: 2017-08-25
  • Publish Date: 2018-11-28
  • To analyze how the ring-stiffened casing attenuate the overall vibration of aero-engine, a ring-stiffened casing-supporting-spindle coupling model was established by the finite element method, and the vibration power flow method was applied to analyze the vibration energy transmitting mechanism of ring-stiffened casing under the excitation of rotors unbalance. According to above analysis, following conclusion can be summarized: ①Energy vortexes field derived by the ring-stiffened rib can partly detour and dissipate the vibration energy transmitted through spindle to casing; ②The ring-stiffened rib changed the vibration energy transmitting path and attenuate vibration energy backflow; ③The type of energy transmitting wave changed when the vibration energy was transmitted to the ring-stiffened rib, the flexural wave carrying the most of vibration energy was changed to the longitudinal wave, and made the vibration energy transmit along the circumferential direction of the ring-stiffened rib. This prevented the vibration energy from transmitting to other area of casing along the axial direction. The conclusions can provide references for whole aero-engines structure design and overall vibration attenuation.

     

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