Method for Suppressing Vibration and Acoustic Signature in a Tiltrotor Aircraft
AssigneeTextron Innovations Inc.
InventorsJoseph W. Wendelsdorf, Victor L. Berry
Life of this patent
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Abstract
A method is disclosed for suppressing an external acoustic signature of an aircraft having at least one pair of non-intermeshing multiple-blade rotors. During operation of the aircraft, the at least one pair of rotors are rotated in an asymmetrically indexed manner that causes the blades of one of each pair of rotors to be consistently out of phase from the blades of the other of each pair of rotors. The selected amount in degrees of asymmetrical indexing is equal to the desired phasing in degrees divided by a number of blades of one of the rotors.
Claims3
A method for suppressing an external acoustic signature of an aircraft having at least one pair of non-intermeshing multiple-blade rotors, the method comprising:
- during operation of the aircraft, rotating the at least one pair of rotors in an asymmetrically indexed manner that causes the blades of one of each pair of rotors to be consistently out of phase from the blades of the other of each pair of rotors by a selected amount;
- wherein the selected amount in degrees of asymmetrical indexing is equal to the desired phasing in degrees divided by a number of blades of one of the rotors.
A method for suppressing an internal acoustic signature of an aircraft having at least one pair of non-intermeshing multiple-blade rotors, the method comprising:
- during operation of the aircraft, rotating the at least one pair of rotors in an asymmetrically indexed manner that causes the blades of one of each pair of rotors to be consistently out of phase from the blades of the other of each pair of rotors by a selected amount;
- wherein the selected amount in degrees of asymmetrical indexing is equal to the desired phasing in degrees divided by a number of blades of one of the rotors.
A method for suppressing vibration in an aircraft having at least one pair of non-intermeshing multiple-blade rotors, the method comprising:
- during operation of the aircraft, rotating the at least one pair of rotors in an asymmetrically indexed manner that causes the blades of one of each pair of rotors to be consistently out of phase from the blades of the other of each pair of rotors by a selected amount;
- wherein the selected amount in degrees of asymmetrical indexing is equal to the desired phasing in degrees divided by a number of blades of one of the rotors.
Dependencies are inferred from the claim text.