Methods and apparatus for balancing a rotor
First Claim
1. A method for balancing a rotor of a rotary machine, wherein the rotor includes n rotor airfoil blades and a rotor shaft, and wherein n is a total number of rotor airfoil blades, said method comprising:
- receiving at least one measurement of at least one of a load, an acceleration, and a displacement that pertains to at least one bending moment acting on the rotor shaft;
determining at least one value of the at least one bending moment acting on the rotor shaft using the received at least one measurement;
determining a pitch offset angle value of no more than (n−
1) rotor airfoil blades based at least in part on the at least one bending moment acting on the rotor shaft, which when applied to the no more than (n−
1) rotor airfoil blades, facilitates reducing the at least one bending moment acting on the rotor shaft; and
changing a pitch angle of the no more than (n−
1) rotor airfoil blades by the pitch offset angle value to facilitate reducing the at least one bending moment acting on the rotor shaft and to facilitate balancing the rotor.
2 Assignments
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Accused Products
Abstract
A method for balancing a rotor of a rotary machine, wherein the rotor includes at least two rotor blades and a rotor shaft, includes receiving at least one measurement of either a load, an acceleration, or a displacement that pertains to at least one bending moment acting on the rotor shaft, determining at least one value of the at least one bending moment acting on the rotor shaft based, at least in part, on the received at least one measurement, and determining a pitch offset angle value of at least one rotor blade that facilitates reducing the at least one bending moment acting on the rotor shaft.
42 Citations
24 Claims
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1. A method for balancing a rotor of a rotary machine, wherein the rotor includes n rotor airfoil blades and a rotor shaft, and wherein n is a total number of rotor airfoil blades, said method comprising:
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receiving at least one measurement of at least one of a load, an acceleration, and a displacement that pertains to at least one bending moment acting on the rotor shaft; determining at least one value of the at least one bending moment acting on the rotor shaft using the received at least one measurement; determining a pitch offset angle value of no more than (n−
1) rotor airfoil blades based at least in part on the at least one bending moment acting on the rotor shaft, which when applied to the no more than (n−
1) rotor airfoil blades, facilitates reducing the at least one bending moment acting on the rotor shaft; andchanging a pitch angle of the no more than (n−
1) rotor airfoil blades by the pitch offset angle value to facilitate reducing the at least one bending moment acting on the rotor shaft and to facilitate balancing the rotor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A rotary machine comprising:
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a rotor comprising a hub, n rotor airfoil blades coupled to said hub, and a rotor shaft coupled to said hub for rotation therewith, wherein n is a total number of rotor airfoil blades; at least one blade pitch actuator coupled to said n rotor airfoil blades for independently controlling an angle of pitch of each of said n rotor airfoil blades; at least one sensor configured to measure at least one of a load, an acceleration, and a displacement that pertains to at least one bending moment acting on said rotor shaft; and a processor coupled to said at least one blade pitch actuator and coupled to said at least one sensor, said processor configured to balance said rotor by; receiving, from said at least one sensor, at least one measurement of at least one of a load, an acceleration, and a displacement that pertains to at least one bending moment acting on said rotor shaft; determining at least one value of the at least one bending moment acting on said rotor shaft using the received at least one measurement; determining a pitch offset angle value for at least one rotor airfoil blade that facilitates reducing the at least one bending moment acting on said rotor shaft; and changing a pitch angle of the at least one rotor airfoil blade by the pitch offset angle value to facilitate reducing the at least one bending moment acting on said rotor shaft. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification