Patent ID: 8567060

Claim:
A method of assembling a rotor assembly of a gas turbine engine having a plurality of rotor components, the rotor components being mounted for rotation between a pair of axially spaced-apart bearings defining an axis of rotation of the rotor assembly, the method comprising the steps of: for each rotor component, determining a mass and a location of a center of mass with respect to the axis of rotation of the rotor assembly; using the mass and the location of the center of mass to determine a static unbalance force associated with each rotor component; summing the static unbalance forces of the rotor components to provide a total static unbalance force of the rotor assembly, including calculating the total static unbalance force at each of the bearings; optimizing an arrangement of rotor components to thereby minimize the total static unbalance force of the rotor assembly, including optimizing the arrangement of rotor components to minimize the total static unbalance force at each of the bearings by iteratively modifying respective stacking angles of the rotor components and re-calculating the total static unbalance force until optimal stacking angles are determined; and assembling the rotor using said optimized arrangement of rotor components.