A method is presented for locating component mass centers in turbomachine rotors made with toothed couplings. In the paper are described the geometrical relationships that would permit one to assemble a turbomachine rotor with predictive knowledge about component mass center locations and thereby have more specific knowledge about rotor mass distribution than is now available. Components are modeled both with one and with two lumped masses. The method requires that the components be balanced individually and that the residual imbalance be measured.

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