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The vibration characteristics of a full scale Jetstream 31 turboprop propeller blade are analysed using a fibre optic range-resolved vibrometer. Using this vibrometer, a 1.2m length propeller blade was interrogated on the low pressure surface at selected spanwise positions. The spectral characteristics of the surface were recorded over wind tunnel speeds ranging from 5m/s to 30m/s in an attempt to decouple an expected aerodynamic shedding frequency from the natural structural frequency of the blade. However, the dominant frequency was found to be the natural frequency and no evidence of shedding aerodynamic frequencies were found using subsequent hot-wire anemometry measurements. Further work is planned to isolate structural and aerodynamic effects, including measurements adjacent to the aerofoil surface and a computation model.

7.1 - Application of Fibre Optic Range-Resolved Interferometric Vibrometry to a Full-Scale Feathered Propeller in a Wind Tunnel