Apparatus and method for partially bladed rotor test
AssigneeRtx Corporation
InventorsZhiqiang Wang, Nicholas J. Lawliss
Life of this patent
Estimating the term…
Abstract
A rotor module, including: a blade cluster of a plurality of blades secured to a rotor disk of the rotor module; and counter weights secured to the rotor disk, wherein the counter weights cause a center of gravity of the plurality of blades to be zeroed out with respect to an axis “O” of the rotor disk and wherein the counter weights cause a moment of inertia Jx about an X axis of the rotor disk is equal to a moment of inertia Jy about a Y axis of the rotor disk when the rotor module is rotated about the axis “O”.
Claims10
A rotor module, comprising:
- a blade cluster of a plurality of blades secured to a rotor disk of the rotor module;
- and
- a pair of counter weights secured to the rotor disk, wherein the pair of counter weights cause a center of gravity of the plurality of blades to be zeroed out with respect to an axis “O” of the rotor disk and the pair of counter weights cause a moment of inertia Jx about an X axis of the rotor disk is to be equal to a moment of inertia Jy about a Y axis of the rotor disk when the rotor module is rotated about the axis “O”, the “X” axis and the “Y” axis are each orthogonally arranged with respect to the axis of the rotor module, and forming a right hand coordinate system with respect to the rotor module rotational direction, the blade cluster creating a mass imbalance and inertial asymmetry in the rotor disk unless the pair of counter weights are secured to the rotor disk and wherein when the center of gravity of the plurality of blades is at a twelve clock position with respect to the axis “O”, one of the pair of counter weights is at a four clock position with respect to the axis “O” and the other one of the pair of counter weights is at an eight clock position with respect to the axis “O” and the plurality of blades and the pair of counter weights define a tri-lobe configuration with respect to the axis “O” of the rotor disk.
A method for zeroing out a center of gravity of a plurality of blades with respect to an axis “O” of a rotor disk the plurality of blades are secured to, comprising:
- securing a blade cluster of the plurality of blades to the rotor disk of a rotor module;
- and
- securing a pair of counter weights to the rotor disk, wherein the pair of counter weights cause a center of gravity of the plurality of blades to be zeroed out with respect to the axis “O” of the rotor disk and the pair of counter weights cause a moment of inertia Jx about an X axis of the rotor disk to be equal to a moment of inertia Jy about a Y axis of the rotor disk when the rotor module is rotated about axis “O”, the “X” axis and the “Y” axis are each orthogonally arranged with respect to the axis of the rotor module, and forming a right hand coordinate system with respect to the rotor module rotational direction, the blade cluster creating a mass imbalance and inertial asymmetry in the rotor disk unless the pair of counter weights are secured to the rotor disk and wherein when the center of gravity of the plurality of blades is at a twelve clock position with respect to the axis “O”, one of the pair of counter weights is at a four clock position with respect to the axis “O” and the other one of the pair of counter weights is at an eight clock position with respect to the axis “O” and the plurality of blades and the pair of counter weights define a tri-lobe configuration with respect to the axis “O” of the rotor disk.
Dependencies are inferred from the claim text.