AIRFOIL RESONANT FREQUENCY TESTING

A resonant frequency testing system for airfoils 12 comprises a broach block 16, a clamp 18, an acoustic speaker 20, a laser vibrometer 22, and a control processor assembly 38. The broach block has a slot disposed to receive the airfoil in an airfoil location. The clamp 18 has a torque-actuated shutoff, and is disposed to lock the airfoil 12 in the broach block slot under a fixed clamping force. The acoustic speaker 20 is disposed adjacent the airfoil location to emit sonic pulses, and the laser vibrometer 22 is oriented towards the airfoil location to sense vibration signatures of the airfoil 12 when excited by the sonic pulses. The control processor assembly 38 is configured to control the acoustic speaker 20 and laser vibrometer 22, to decompose the sensed vibration signatures into resonant frequencies of the airfoil 12, and to store the resonant frequencies in a digital storage database, correlated with a unique ID corresponding to the airfoil.