For the characteristics of small aspect ratio compressor rotor blade

two judgement methods on the basis of energy method were presented. The analysis results of structure dynamics were employed to analyze the rotor frequency dispersion

vibration mode and resonance vibration

while the possibility of high mode coupled flutter was estimated. Then the vibration displacements from structure dynamics into aerodynamic mesh were applied to calculate three dimensional nonsteady viscous filed to get unsteady aerodynamic work

estimating the possibility of stall flutter. Finally

considering two analysis results as well as the test results and fracture analysis

cracks appeared in small aspect ratio compressor rotor blade within a short time due to the combined effects of stall flutter and coupled flutter.