Patent ID: 8887564
Filing Date: 2014-11-18
Classification: F01D,F16F,G01M,Y02T

Abstract:
1. A method for predicting an initial unbalance in a bladed disc or ring including one or more aerofoil components, the method comprising: defining, with a processor, a statistical distribution of a mass moment weight of each of the one or more aerofoil components; restricting, with the processor, the statistical distribution to a selected range of mass moment weight for each of the one or more aerofoil components, the selected range indicating a probability of obtaining a bladed disc or ring which cannot be balanced using a balance correction feature; selecting, with the processor, a plurality of sets of aerofoil components from the statistical distribution and allocating a location for each aerofoil component on the bladed disk or ring, wherein each set of aerofoil components forms a sample distribution; calculating, with the processor, a vector sum of the mass moment weights for each sample distribution to determine the initial unbalance of the bladed disc or ring for the selected range of mass moment weight for each of the one or more aerofoil components; and providing the bladed disc or ring with the balance correction feature, the balance correction feature having a suitable size to correct a maximum unbalance of the restricted distribution.