Patent ID: 8701286

Claim:
A method of manufacturing a rotationally balanced rotating part, the method comprising the steps of: providing a rotor hub or rotor ring and a plurality of rotor blades for assembly onto the rotor hub or rotor ring, each blade having an internal cavity; determining an initial mass, an initial moment weight and an internal cavity volume for each of the plurality of rotor blades; predicting a final mass and a final moment weight of each of the plurality of rotor blades based on the determined initial mass, initial moment weight and internal cavity volume; assembling the plurality of rotor blades onto the rotor hub or rotor ring to form the rotating part; wherein the position of each of the plurality of rotor blades relative to the remaining plurality of rotor blades on the rotor hub or rotor ring is based on the predicted final mass and final moment weight of each of the plurality of rotor blades; and subsequently filling the internal cavity of each of the plurality of rotor blades after each of the plurality of rotor blades has been assembled onto the rotor hub or rotor ring to form the rotating part.