Coupling Vibration of Turbomachinery Rotor Blades as a Possible Cause of Disk Rim Failure

Results of numerical experiments involving the determination of possible causes of disk rim failure of a rotor wheel with blades, having the root of a dovetail joint type, are presented. The experiments were performed using the theory of coupling vibration of mechanical systems. Numerical investigations of specific features of natural vibration spectrum of the rotor design considered and of the influence of the blade frequencies mistiuning upon resonant vibrations have been performed to elucidate the cause of rather high vibration stresses in the disk rim.