Automatic, active blade tracking and balance system

Patent metadata

Field	Value
Publication number	US-11299263-B2
Application number	US-201615372072-A
Country	US
Kind code	B2
Filing date	Dec 7, 2016
Priority date	Dec 7, 2016
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

The present invention includes an apparatus and method for automatically adjusting the tracking of one or more blades comprising: a blade tracking adjustment mechanism connected to one or more blades of an aircraft; a blade tracking measurement system that measures the tracking of the one or more blades; and a computer that receives an output from the blade tracking measurement system with tracking information for each of the one or more blades; wherein the computer outputs instructions for the blade tracking adjustment mechanism to change a pitch of one or more of the blades to correct blade tracking.

First claim

What is claimed is:

1. An apparatus for automatically adjusting a tracking of one or more blades of an aircraft comprising:
a blade tracking adjustment mechanism connected to each individual blade of the one or more blades by a respective eccentric pitch horn clevis, wherein the blade tracking adjustment mechanism is communicably connected to a rotor hub, and wherein each blade is connected to the rotor hub by the respective eccentric pitch horn clevis, wherein each respective eccentric pitch horn clevis is rotated to create an effectively shorter or longer pitch link length to change a pitch to adjust a tracking of each individual blade;
a blade tracking measurement system that measures the tracking of each individual blade of the one or more blades; and
a processor that receives an output from the blade tracking measurement system with tracking information for each individual blade of the one or more blades and determines whether a measured tracking of each individual blade of the one or more blades is within a plurality of specified operational parameters, wherein the plurality of specified operational parameters includes specified operational parameters that define a desired out-of-track condition for at least one individual blade of the one or more blades;
wherein the processor controls the blade tracking adjustment mechanism at the rotor hub when the measured tracking is not within the plurality of specified operational parameters to change a pitch of each individual blade individually to adjust the tracking of each individual blade individually while the rotor is spinning; and
wherein the processor comprises a non-transitory computer readable medium for automatically adjusting a tracking of each individual blade of the one or more blades, comprising instructions stored thereon, that when executed by a computer having a communications interface, performs the step of adjusting the tracking of each individual blade individually during flight or service.

2. The apparatus of claim 1 , wherein the processor is a flight control computer.

3. The apparatus of claim 1 , wherein the blade tracking adjustment mechanism is permanently attached to the aircraft.

4. The apparatus of claim 1 , wherein the aircraft is a helicopter, a rotorcraft, or a vertical take off and landing rotorcraft.

5. The apparatus of claim 1 , further comprising a dynamic rotor balance system communicably coupled to the processor, wherein the dynamic rotor system balance system balances the one or more blades automatically.

6. The apparatus of claim 1 , wherein the blade tracking adjustment mechanism is a rotor analysis and diagnostic system.

7. The apparatus of claim 1 , further comprising a static rotor balance system capable of adjusting the balance of a blade of the one or more blades prior to installation and tracking and balance of the blade.

8. The apparatus of claim 1 , further comprising a hub balance adjustment mechanism communicably coupled to the processor, wherein the hub balance adjustment mechanism balances at least one of the one or more blades.

9. A method for automatically adjusting a tracking of one or more blades, the method comprising:
providing a blade tracking adjustment mechanism connected to each individual blade of the one or more blades, wherein the blade tracking adjustment mechanism is communicably connected to a respective eccentric pitch horn clevis that is connected to a rotor hub, wherein each individual blade is connected to the rotor hub by the respective eccentric pitch horn clevis, wherein each respective eccentric pitch horn clevis is rotated to create an effectively shorter or longer pitch link length to change a pitch to adjust a tracking of each individual blade, a blade tracking measurement system communicably coupled to the blade tracking adjustment mechanism, and a processor communicably coupled to the blade tracking measurement system and the blade tracking adjustment system, and a hub balancing system connected to a blade balancing system that is communicably coupled to the processor;
measuring the tracking of each individual blade of the one or more blades using the blade tracking measurement system;
determining whether a measured tracking of each individual blade of the one or more blades is within a plurality of tracking operational parameters using the processor, wherein the plurality of tracking operational parameters includes tracking operational parameters that define a desired out-of-track condition for at least one individual blade of the one or more blades;
adjusting the tracking of each individual blade individually during flight or service;
adjusting the tracking of each individual blade individually at the rotor hub when the measured tracking is not within the plurality of tracking operational parameters;
determining whether a measured balance of each individual blade of the one or more blades is within one or more balance operational parameters using the processor;
adjusting the balance of each blade when the measured balance is not within the one or more balance operational parameters; and
changing at least one of:
the pitch of each individual blade individually with the blade tracking adjustment mechanism based on an output received from the processor; or
the balance of each individual blade individually with the blade balancing system based on an output received from the processor while the rotor is spinning.

10. A non-transitory computer readable medium for automatically adjusting a tracking of one or more blades, comprising instructions stored thereon, that when executed by a computer having a communications interface, one or more databases and one or more processors communicably coupled to the interface and one or more databases, perform the steps comprising:
providing a blade tracking adjustment mechanism connected to each individual blade of the one or more blades, wherein the blade tracking adjustment mechanism is communicably connected to a respective eccentric pitch horn clevis which is connected to a rotor hub, wherein each individual blade is connected to the rotor hub by the respective eccentric pitch horn clevis, wherein each respective eccentric pitch horn clevis is rotated to create an effectively shorter or longer pitch link length to change a pitch to adjust a tracking of each individual blade an electric motor, a blade tracking measurement system communicably coupled to the blade tracking adjustment mechanism, and a processor communicably coupled to the blade tracking measurement system and the blade tracking adjustment system;
measuring the tracking of each individual blade of the one or more blades using the blade tracking measurement system;
determining whether a measured tracking of each individual blade of the one or more blades is within a plurality of specified operational parameters using the processor, wherein the plurality of specified operational parameters includes specified operational parameters that define a desired out-of-track condition for at least one individual blade of the one or more blades;
adjusting the tracking of each individual blade individually during flight or service;
adjusting the tracking of each individual blade individually at the rotor hub when the measured tracking is not within the plurality of specified operational parameters; and
changing the pitch of each individual blade individually with the blade tracking adjustment mechanism based on an output received from the processor while the rotor is spinning.

11. A method for automatically adjusting a tracking of one or more blades of an aircraft, the method comprising:
providing a blade tracking adjustment mechanism connected that is connected to each ind

Assignees

• Bell Helicopter Textron Inc
• Textron Innovations Inc

Inventors

• Thompson Terry K
• Cravener Kyle Thomas

Classifications

• B64C11/301

  characterised by blade position indicating means · CPC title

• B64C11/34

  automatic · CPC title

• B64C27/008 Primary

  Rotors tracking or balancing devices · CPC title

• B64C27/57

  automatic or condition responsive, e.g. responsive to rotor speed, torque or thrust · CPC title