Gas turbine rotor assembly and balancing methods

摘要

Method of assembling a rotor assembly of a gas turbine engine having a plurality of components. The method comprises in one aspect calculating the bending forces due to the mass distribution along the rotor. In another aspect, an optimization routine iterates different rotor arrangements, comparing the calculated bending moments to determine a set of component positions that minimizes the bending forces. In another aspect, mass corrections are optimized to balance the rotor assembly.

主权项

1. A method of assembling a rotor assembly of a gas turbine engine, the rotor assembly including a plurality of rotor components mounted between axially spaced-apart bearings, the method comprising:
for an initial assembly of the rotor components, determining initial geometric data indicative of a radial deviation of a centre of mass of each rotor component relative to an axis of rotation of the assembly defined by the axially spaced-apart bearings; determining an initial mass of each rotor component; using the initial geometric data and mass data to calculate unbalance forces at the axially spaced-apart bearings; calculating a bending moment distribution acting on the rotor assembly induced by the rotor components and representative of the forces reacted by the axially spaced-apart bearings; considering an entire rotor shape between the bearings, determining a set of rotor component stacking positions and associated bearing reactions which minimize cumulative bending moments in the rotor assembly; assembling the rotor assembly using said set of rotor component stacking positions; and correcting a residual unbalance present in the rotor assembly.