| fBV | the Frequency of Blade Vibration |
| fAR | the Frequency of Acoustic Resonance |
| IGV | Inlet Guide Vane |
| EO | Engine Order |
| NSV | Non-Synchronous Vibration |
| RANS | Reynolds-Averaged Navier-Strokes equation |
| CFD | Computational Fluid Dynamics |
| IBPA | Inter Blade Phase Angle |
| LCO | Limit Cycle Oscillation |
| fBPF | Blade Passing Frequency |
| D | the nodal diameter number |
| the angle of inter blade phase | |
| N | number of blades |
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