System and method for operation and management of reconfigurable unmanned aircraft

• US 9,878,786 B2
• Filed: 02/24/2015
• Issued: 01/30/2018
• Est. Priority Date: 12/04/2014
• Status: Expired due to Fees

• Current Assignee: Elwha LLC (Intellectual Ventures LLC)
• Original Assignee: Elwha LLC (Intellectual Ventures LLC)
• Inventors: Chan, Alistair K., Cheatham, III, Jesse R., Chin, Hon Wah, Duncan, William David, Hyde, Roderick A., Ishikawa, Muriel Y., Kare, Jordin T., Pan, TOny S., Petroski, Robert C., Tegreene, Clarence T., Tuckerman, David B., Weaver, Thomas Allan, Wood, Jr., Lowell L.
• Primary Examiner(s): Bonzell, Philip J
• Application Number:
  US14/630,114
• Publication Number:
  US 20160159471A1
• Time in Patent Office: 1,071 Days
• CPC Class Codes: B64C 27/52 Tilting of rotor bodily relative to fuselage of see-saw type construction B64C27/43
• CPC Class Codes: B64D 27/40 Arrangements for mounting power plants in aircraft
• CPC Class Codes: B64U 10/13 Flying platforms
• CPC Class Codes: B64U 10/14 with four distinct rotor axes, e.g. quadcopters
• CPC Class Codes: B64U 10/16 with five or more distinct rotor axes, e.g. octocopters
• CPC Class Codes: B64U 2101/31 for surveillance
• CPC Class Codes: B64U 2101/60 for transporting passengers; for transporting goods other than weapons
• CPC Class Codes: B64U 30/20 Rotors; Rotor supports
• CPC Class Codes: B64U 50/11 using internal combustion piston engines
• CPC Class Codes: B64U 50/19 using electrically powered motors

Abstract

A reconfigurable unmanned aircraft system is disclosed. A system and method for configuring a reconfigurable unmanned aircraft and system and method for operation and management of a reconfigurable unmanned aircraft in an airspace are also disclosed. The aircraft is selectively reconfigurable to modify flight characteristics. The aircraft comprises a set of rotors. The position of at least one rotor relative to the base can be modified by at least one of translation of the rotor relative to the boom, pivoting of the boom relative to the base, and translation of the boom relative to the base; so that flight characteristics can be modified by configuration of position of at least one rotor relative to the base. A method of configuring an aircraft having a set of rotors on a mission to carry a payload comprises the steps of determining properties of the payload including at least mass properties, determining the manner in which the payload will be coupled to the aircraft, determining configuration for each of the rotors in the set of rotors at least partially in consideration of the properties of the payload, and positioning the set of rotors in the configuration for the aircraft to perform the mission.

Claims

1. A method of configuring an aircraft having a set of repositionable rotors for unmanned flight on a mission to carry a payload from an initial configuration into a configuration for the mission, the aircraft including a base and the set of repositionable rotors being coupled to the base, the method comprising:

(a) determining properties of the payload including at least mass properties;

(b) determining the manner in which the payload will be coupled to the aircraft;

(c) determining a configuration for the mission for each of the rotors in the set of rotors at least partially in consideration of the properties of the payload; and

(d) positioning the set of rotors into the configuration for the mission for the aircraft to perform the mission, wherein configuration of one of the rotors on a boom relative to the base is modifiable by (1) translation of the rotor relative to the boom.

2. The method of claim 1 wherein the configuration for the mission is different from the initial configuration.

3. The method of claim 1 wherein the step of positioning the set of rotors comprises repositioning the set of rotors from the initial configuration into the configuration for the mission in consideration of the properties of the payload and desired flight characteristics for the mission.

4. The method of claim 1 wherein the initial configuration is a storage configuration used to store the aircraft in a compact arrangement when not in use and the configuration for the mission is a flight configuration used when the aircraft is to be in flight to carry payload.

5. The method of claim 1 further comprising the step of operating the aircraft in the configuration.

6. The method of claim 1 further comprising the step of determining flight characteristics for the aircraft with payload.

7. The method of claim 1 further comprising the step of evaluating operating conditions for the mission.

8. The method of claim 1 wherein the aircraft comprises a base and the set of rotors is coupled to the base and wherein configuration of one of the rotors on a boom relative to the base is modifiable by at least one of (2) translation of the boom relative to the base;

(3) pivoting of the boom relative to the base;

(4) retraction of the boom relative to the base;

(5) pivoting of the rotor relative to the boom;

(6) raising the height of the boom relative to the base;

(7) lowering the height of the boom relative to the base;

(8) rotation of the rotor relative to the base;

(9) rotational twist of the boom relative to the base;

(10) changing spacing of the rotor relative to another rotor in the set of rotors;

(11) changing incline of the rotor;

(12) changing horizontal position of the rotor relative to the base;

(13) changing the vertical position of the rotor relative to the base;

(14) moving the rotor inward relative to the base;

(15) moving the rotor outward relative to the base;

(16) tilting the rotor;

(17) changing the rotor thrust;

(18) disabling the rotor;

(19) adjusting the pitch of vanes of the rotor; and

(20) changing the rotation speed of the rotor.

9. The method of claim 1 wherein the aircraft comprises a base and the set of rotors is coupled to the base and wherein a payload having a mass is carried and the position of at least one rotor is modified to compensate for the position of the mass of the payload relative to the base.

10. The method of claim 1 wherein the aircraft comprises a base and the set of rotors is coupled to the base and wherein at least one rotor is repositioned relative to the base to compensate for the mass of the payload.

11. The method of claim 1 wherein the configuration is reconfiguration of rotor position and the reconfiguration of rotor position is during a mission to at least one of compensate for a change in center of mass of the aircraft, compensate for a change in mass properties balance of the aircraft, and rebalance mass properties after partial delivery of payload.

12. The method of claim 1 wherein determining the configuration for the mission comprises at least one of at least partially considering flight characteristics for the aircraft and at least partially considering anticipated operating conditions for the aircraft.

13. The method of claim 12 wherein flight characteristics are modifiable by at least one of (a) changing rotation speed of at least one rotor in the set of rotors, (b) changing pitch of vanes of at least one rotor in the set of rotors, or (c) changing position of at least one rotor in the set of rotors relative at least one other rotor in the set of rotors.

14. The method of claim 12 wherein flight characteristics comprise at least one of aerodynamic profile, maneuverability, available thrust, available lift, energy consumption, energy efficiency, mass, mass properties, center of mass, center of gravity, balance point, stability, controllability, control axes, maximum relative ground velocity, maximum relative air speed, ascent rate, descent rate, sink rate, flight altitude, aerodynamic drag, number of operational rotors, control system type, equipment status.

15. The method of claim 12 wherein flight characteristics are modifiable in response to operating conditions for a mission.

16. A method of operating a reconfigurable multi-rotor unmanned aircraft having flight characteristics for a mission including flight with payload in operating conditions, the aircraft including a base and each of the rotors being coupled to the base by a boom, the method comprising:

(a) configuring the aircraft in an ascent configuration with flight characteristics for ascent to start a flight; and

(b) configuring the aircraft in a first flight configuration with flight characteristics for flight in operating conditions;

wherein configuring the aircraft comprises positioning of at least one rotor of the aircraft into the configuration, wherein configuration of one of the rotors relative to the base is modifiable by (1) translation of the rotor relative to the boom; and

wherein flight characteristics of the aircraft include consideration of properties of any payload carried by the aircraft.

17. The method of claim 16 wherein flight characteristics are modifiable by at least one of (a) changing rotation speed of at least one rotor in the set of rotors, (b) changing pitch of vanes of at least one rotor in the set of rotors, or (c) changing position of at least one rotor in the set of rotors relative at least one other rotor in the set of rotors.

18. The method of claim 16 wherein flight characteristics comprise at least one of aerodynamic profile, maneuverability, available thrust, available lift, energy consumption, energy efficiency, mass, mass properties, center of mass, center of gravity, balance point, stability, controllability, control axes, maximum relative ground velocity, maximum relative air speed, ascent rate, descent rate, sink rate, flight altitude, aerodynamic drag, number of operational rotors, control system type, equipment status.

19. The method of claim 16 wherein flight characteristics of the aircraft with payload comprise effects of the payload including aerodynamic drag effects of the payload.

20. The method of claim 16 wherein the ascent configuration is substantially dissimilar from the first flight configuration.

21. The method of claim 16 wherein configuration of one of the rotors relative to the base is modifiable by at least one of (2) translation of the boom relative to the base;

(3) pivoting of the boom relative to the base;

(4) retraction of the boom relative to the base;

(5) pivoting of the rotor relative to the boom;

(6) raising the height of the boom relative to the base;

(7) lowering the height of the boom relative to the base;

(8) rotation of the rotor relative to the base;

(9) rotational twist of the boom relative to the base;

(10) changing spacing of the rotor relative to another rotor;

(11) changing incline of the rotor;

(12) changing horizontal position of the rotor relative to the base;

(13) changing the vertical position of the rotor relative to the base;

(14) moving the rotor inward relative to the base;

(15) moving the rotor outward relative to the base;

(16) tilting the rotor;

(17) changing the rotor thrust;

(18) disabling the rotor;

(19) adjusting the pitch of vanes of the rotor; and

(20) changing the rotation speed of the rotor.

22. The method of claim 16 further comprising the step of configuring the aircraft in a descent configuration with flight characteristics for descent to conclude a flight.

23. The method of claim 22 wherein the descent configuration is substantially the same as the ascent configuration.

24. The method of claim 16 wherein flight characteristics are modifiable in response to operating conditions for a mission.

25. The method of claim 24 wherein operating conditions for a mission comprise at least one of operability of each rotor, energy storage capacity, remaining energy storage, payload profile, payload mass, payload type, payload shape, payload size, payload changes, route, altitude, traffic, weather conditions, weather effects, wind velocity, wind direction, distance of mission, remaining distance of mission, time for mission, remaining time for mission, fuel storage capacity, remaining fuel, energy storage capacity, remaining stored energy.

26. The method of claim 16 further comprising configuring the aircraft in a second flight configuration with flight characteristics for flight in operating conditions.

27. The method of claim 26 wherein the second flight configuration is substantially the same as the first flight configuration.

28. A method of managing a fleet of reconfigurable aircraft of a type having a set of rotors to provide thrust for unmanned flight to perform a set of missions, each of the aircraft including a base and at least one rotor coupled to the base by a boom, the method comprising:

1. configuring a first aircraft in a first configuration to perform a first mission; and

2. configuring a second aircraft in a second configuration to perform a second mission;

wherein the first aircraft is substantially the same as the second aircraft;

wherein configuring one of the aircraft includes positioning at least one rotor of the set of rotors of the aircraft to provide for intended flight characteristics, and wherein positioning at least one rotor of the set of rotors includes modifying the position of at least one rotor by (1) translation of the rotor relative to the boom; and

wherein each of a plurality of aircraft in the fleet is configurable into a configuration to perform each of a plurality of missions.

29. The method of claim 28 wherein a plurality of missions comprises at least one of carrying of payload and flight of aircraft in operating conditions.

30. The method of claim 28 wherein configuration of each aircraft for a mission is at least partially in consideration of at least one of operating conditions, the payload for the mission, the type of aircraft and intended flight characteristics of the aircraft with the payload in operating conditions, and availability of aircraft in the fleet to perform missions.

31. The method of claim 28 wherein positioning the set of rotors further comprises modifying the position of at least one rotor by at least one of (2) translation of the boom relative to the base;

(3) pivoting of the boom relative to the base;

(4) retraction of the boom relative to the base;

(5) pivoting of the rotor relative to the boom;

(6) raising the height of the boom relative to the base;

(7) lowering the height of the boom relative to the base;

(8) rotation of the rotor relative to boom; and

(9) rotation of the boom relative to the base.

32. The method of claim 28 wherein modification of position of at least one rotor comprises modification of position of the rotor relative to at least one other rotor.

33. The method of claim 28 wherein positioning comprises positioning at least one rotor relative to another rotor.

34. The method of claim 28 wherein positioning comprises positioning of at least one rotor relative to the base.

35. The method of claim 28 wherein positioning comprises at least one of positioning prior to a mission and repositioning during a mission.