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.