WO2015191747A1 - Véhicules aériens et procédés d'utilisation - Google Patents

Véhicules aériens et procédés d'utilisation Download PDF

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Publication number
WO2015191747A1
WO2015191747A1 PCT/US2015/035150 US2015035150W WO2015191747A1 WO 2015191747 A1 WO2015191747 A1 WO 2015191747A1 US 2015035150 W US2015035150 W US 2015035150W WO 2015191747 A1 WO2015191747 A1 WO 2015191747A1
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WO
WIPO (PCT)
Prior art keywords
aerial vehicle
flight
wings
aft
aerodynamic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/US2015/035150
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English (en)
Inventor
Ronald M. Barrett
Robert B. HONEA
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Individual
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Individual
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Filing date
Publication date
Priority claimed from US14/734,864 external-priority patent/US9878257B2/en
Application filed by Individual filed Critical Individual
Publication of WO2015191747A1 publication Critical patent/WO2015191747A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U30/00—Means for producing lift; Empennages; Arrangements thereof
    • B64U30/10—Wings
    • B64U30/12—Variable or detachable wings, e.g. wings with adjustable sweep
    • B64U30/14—Variable or detachable wings, e.g. wings with adjustable sweep detachable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C29/00—Aircraft capable of landing or taking-off vertically, e.g. vertical take-off and landing [VTOL] aircraft
    • B64C29/02—Aircraft capable of landing or taking-off vertically, e.g. vertical take-off and landing [VTOL] aircraft having its flight directional axis vertical when grounded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U10/00—Type of UAV
    • B64U10/25—Fixed-wing aircraft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U50/00—Propulsion; Power supply
    • B64U50/10—Propulsion
    • B64U50/13—Propulsion using external fans or propellers
    • B64U50/14—Propulsion using external fans or propellers ducted or shrouded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U60/00—Undercarriages
    • B64U60/50—Undercarriages with landing legs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U20/00—Constructional aspects of UAVs
    • B64U20/30—Constructional aspects of UAVs for safety, e.g. with frangible components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U2101/00—UAVs specially adapted for particular uses or applications
    • B64U2101/05—UAVs specially adapted for particular uses or applications for sports or gaming, e.g. drone racing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U2201/00—UAVs characterised by their flight controls
    • B64U2201/20—Remote controls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U50/00—Propulsion; Power supply
    • B64U50/10—Propulsion
    • B64U50/19—Propulsion using electrically powered motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U70/00—Launching, take-off or landing arrangements
    • B64U70/80—Vertical take-off or landing, e.g. using rockets

Definitions

  • the disclosure is concerned with aerial vehicles. More particularly, pertains to a class of flying toys which are able to hover like helicopters, then convert and fly like airplanes using a plurality of propellers and wings for lift and flight control.
  • an aerial vehicle includes a body, at least one motor supported by the body, and at least three aerodynamic propulsors driven by the at least one motor.
  • the body includes a plurality of forward wings and a plurality of aft wings extending away from a longitudinal axis of the body.
  • the plurality of forward wings extends in a forward wing plane that contains the longitudinal body axis and is tilted no more than 15 degrees from the longitudinal body axis.
  • the plurality of aft wings extends in a forward wing plane that contains the longitudinal body axis and is tilted no more than 15 degrees from the longitudinal body axis.
  • the at least three aerodynamic propulsors are positioned longitudinally between the plurality of forward wings and plurality of aft wings.
  • an aerial vehicle in another embodiment, includes a body, at least three aerodynamic propulsors each driven by a motor, a communication module, and a flight director.
  • the body includes a plurality of forward wings and a plurality of aft wings extending away from a longitudinal axis of the body.
  • the plurality of forward wings extends in a forward wing plane that contains the longitudinal body axis and is tilted no more than 15 degrees from the longitudinal body axis.
  • the plurality of aft wings extends in a forward wing plane that contains the longitudinal body axis and is tilted no more than 15 degrees from the longitudinal body axis.
  • the at least three aerodynamic propulsors are positioned longitudinally between the plurality of forward wings and plurality of aft wings.
  • the flight director is in data communication with at least one of the motors associated with the at least three aerodynamic propulsors and has a stability augmentation system configured to receive flight state information and pilot commands and to output flight control commands based at least partially upon the flight state information and pilot commands.
  • an aerial vehicle in yet another embodiment, includes a body, at least three aerodynamic propulsors each driven by a motor, a communication module, and a flight director.
  • the body includes a plurality of forward wings and a plurality of aft wings extending away from a longitudinal axis of the body.
  • the plurality of forward wings extends in a forward wing plane that contains the longitudinal body axis and is tilted no more than 15 degrees from the longitudinal body axis.
  • the plurality of forward wings includes a structural leading edge that is configured to structurally support landing gear and extends through a radially outwardmost point of the aerial vehicle.
  • the plurality of aft wings extends in a forward wing plane that contains the longitudinal body axis and is tilted no more than 15 degrees from the longitudinal body axis.
  • the at least three aerodynamic propulsors are positioned longitudinally between the plurality of forward wings and plurality of aft wings and within the radially outwardmost point such that the structural leading edge forms a propulsor cage that provides protection for the aerodynamic propulsors from impact.
  • the flight director is in data communication with at least one of the motors associated with the at least three aerodynamic propulsors and has a stability augmentation system configured to receive flight state information and pilot commands and to output flight control commands based at least partially upon the flight state information and pilot commands.
  • FIG. 1 illustrates an example of the physics of the pitchback instability coupled with cross-flow drag problems which plague open-propeller and shrouded- propeller aerial vehicle designs.
  • FIG. 2 illustrates the wall recirculation zone with resulting wall suction moments.
  • FIG. 3 is a comparison of energy requirements of a convertible aerial vehicle versus conventional helicopter and airplane designs.
  • FIG. 4 is a perspective view of an embodiment of a convertible aerial vehicle, according to the present disclosure.
  • FIG. 5 is a perspective view of an embodiment of a convertible aerial vehicle having a propeller cage, according to the present disclosure.
  • FIG. 6 is a perspective view of an embodiment of a convertible aerial vehicle with removable training wings in an assembled and disassembled form, according to the present disclosure.
  • FIG. 7 is a perspective view of an embodiment of a convertible aerial vehicle with multiple sets of propellers and without an undercarriage, according to the present disclosure.
  • FIG. 8 is a side view of an embodiment of a convertible aerial vehicle along the body in a hover flight configuration illustrating pitch, roll and yaw moments and longitudinal body axis and transverse body axis translational force vectors, according to the present disclosure.
  • FIG. 9 is a side view of an embodiment of a convertible aerial vehicle in an airplane-mode illustrating pitch, yaw and roll moments and longitudinal body axis and transverse body axis translational force vectors, according to the present disclosure.
  • FIG. 10 illustrates an embodiment of a convertible aerial vehicle in quiescent hover flight and the physics of deck-level hovering flight during transition and/or when exposed to a lateral gust field.
  • FIG. 11 schematically illustrates communication of pilot commands and/or other flight commands to an embodiment of a convertible aerial vehicle, according to the present disclosure.
  • FIG. 12 illustrates a schematic drawing of an embodiment of stability and control loop architecture, according to the present disclosure.
  • FIG. 13 illustrates a pair of embodiments of aerial vehicle toys engaged in ribbon-cutting and laser-tag dogfight flight, according to the present disclosure.
  • FIG. 14 is a perspective view of a pair of embodiments of convertible aerial vehicles engaging in lofting and deploying a cargo, according to the present disclosure.
  • FIG. 15 is a perspective view of an embodiment of a core of a convertible aerial vehicle with structural leading wing edges, according to the present disclosure.
  • FIG. 16 is a perspective view of an embodiment of a convertible aerial vehicle including the core of FIG. 15 in an assembled and partially disassembled form, according to the present disclosure.
  • FIG. 17 is a perspective view of an embodiment of a convertible aerial vehicle with a curved leading wing edge in an assembled and partially disassembled form, according to the present disclosure.
  • FIG. 18 is a perspective view of an embodiment of a convertible aerial vehicle with a canard wing set, according to the present disclosure.
  • FIG. 19 is a perspective view of an embodiment of a convertible aerial vehicle with a rocket propulsor mounted in the body, according to the present disclosure.
  • any references to "up” and “down” or “above” and “below” or “forward” and “aft” are merely descriptive of the relative position or movement of the related elements. Any element described in relation to an embodiment or a figure herein may be combinable with any element of any other embodiment or figure described herein.
  • This disclosure generally relates to aerial vehicles.
  • This disclosure relates to aerial vehicles with multiple aerodynamic propulsors that are capable of flight convertible from a hover flight to an airplane-type or translational flight mode.
  • Multi-propeller aerial vehicles are susceptible to being disturbed by gust fields via pitchback instabilities and large cross-flow drag levels when in hovering flight. This tendency for instability increases the probability of a crash, which, in turn, often leads to vehicle breakage and/or harm to bystanders.
  • a more debilitating crash mode which is not readily apparent is related to wall-suction.
  • a hovering aerial vehicle approaches a vertical surface, especially one which is close to the ground, a toroidal vortex is established in the form of a recirculation donut.
  • This recirculation zone generates a strong downwash field on the wall- side of the propellers, thereby reducing lift and pitching the propellercraft towards the wall. This almost always leads to a crash.
  • propeller guards One solution to catastrophic propeller breakage is to install propeller guards.
  • propeller guards lead to high weight increments and even greater pitchback instabilities and crossflow drag when in freeflight, when exposed to a gust and close to walls.
  • the translational problem is weakly dealt with by pitching the aircraft into the local gust field. While sometimes effective, the response time is often slow and leads to gross body rotations which disturb camera views which are often used for piloting via First Person View (FPV) systems.
  • FMV First Person View
  • At least one embodiment described herein is capable of both hovering and airplane-like translational flight (i.e. , applying thrust in a direction that is generally parallel to the ground for an extended period of time).
  • an aerial vehicle achieves improved hover performance like a helicopter and yet maintains the ability to execute fully acrobatic maneuvers like a high performance airplane.
  • aircraft that are good at airplane-type flight have very limited hover maneuverability and are susceptible to lateral gusts when in a hover, are often flipped over when in hover modes and are unable to land without catastrophic wing, empennage, fuselage and/or propeller strike.
  • Aerial vehicles which are good at hovering and low- speed flight often have such tremendous levels of drag when in high speed flight that they cannot even begin to reach conventional airplane or toy airplane speeds.
  • a propeller 102 may experience pitchback instabilities 104 and crossflow drag 106 that induce large body rotational and spatial excursions (i.e. , deviations from intended flight pattern or direction) in the propeller 102 or in hovering vehicles that employ the propeller 102 when flying in real atmospheric conditions. These excursions often lead to crashes unto themselves against hard objects, the ceiling, the ground, or people, resulting in harm to individuals and/or damage to the vehicle and surrounding environment.
  • the excursions may place a vehicle 108 employing the propeller 102 in the proximity of a vertical surface 110 (like the side of a house or wall) where a toroidal recirculation zone 112, induces a high level of down wash on the propeller 102 or vehicle 108 propeller- side closest to the vertical surface 110, which in turn sucks the vehicle 108 towards the vertical surface 110 or wall.
  • the toroidal recirculation zone 112 may lead to vehicle 108 instabilities, which may be exacerbated by attempts to stabilize the vehicle 108.
  • toroidal recirculation zone 112 suction at or near vertical surfaces 110 may induce both wall-side rotation and translation, which may in turn frequently induce crashes, disturb camera angles via body rotations, lead to mechanical breakage, and, in flight close to people, can even harm individuals.
  • FIG. 3 illustrates that if a given aircraft with a fixed amount of maximum power is flown in a helicopter-like (hover) configuration, it will have a reasonable hover required-power but will have a comparatively low helicopter maximum translational flight speed 218, which is determined when the helicopter required-power line 214 intersects the available power line.
  • the airplane required-power line 216 is dominated by stall-related effects at low speeds leading to an airplane minimum speed.
  • the airplane required-power line will intersect at a given available power line, which determines the airplane maximum translational flight speed 220, which is much higher than the helicopter maximum translational flight speed 218.
  • At least one embodiment of a convertible aerial vehicle described herein displays a convertible required-power line 222 that lacks the stall speed constraint of an airplane which sets wing areas to high levels. Instead, the wings of the convertible aircraft can be significantly smaller. This, in turn, leads to a dramatic reduction in wetted area (i. e. , the area of atmosphere through which the vehicle moves) which decreases total flat plate equivalent drag, /. Because / of the convertible aerial vehicle is much lower than that of a similarly powered airplane, a simple relationship governing the convertible maximum translational flight speed 224 of the aircraft makes the relationship clear. Given two otherwise identical designs, the one with a lower value of equivalent flat plate area will be faster:
  • ⁇ ⁇ is the propeller efficiency
  • P sav is the shaft power available
  • p is the density of air
  • / is the parasite area of the aircraft
  • CL is the lift coefficient of the lifting surface
  • A is the aspect ratio of the lifting surface
  • e is the Oswald' s efficiency of the lifting surface.
  • the convertible aerial vehicle will be able to either go faster with the same size powerplant and/or achieve the same top speed with a smaller motor.
  • FIG. 3 illustrates a potential opportunity presented by a synergistically designed convertible aerial vehicle.
  • An embodiment of a synergistically designed convertible aerial vehicle may hover with system-level Figure of Merit (FOM) similar to or greater than that of a helicopter and then convert to a translational flight mode for high speed flight (which is typically two to five times greater than the highest speeds that can be achieved by a conventional helicopter), then convert back to hover flight for, in one example, landing.
  • the translational flight may include flight generated by one or more propulsors that lies mostly in a horizontal plane and is close to the primary direction of flight.
  • jet engines are typically tilted less than 15° from the body longitudinal axis, which in turn is typically oriented within 15° of a horizontal plane for most of the flight and principally in the direction of flight, which coincides with the x-direction stability axis.
  • Other examples of airplane mode flight include that which is achieved by gliders as noted by the direction of flight as coinciding with the x-direction stability axis in still-air conditions with no propulsors present.
  • Aircraft which possess translational flight capability typically have one or more thrust generating mechanisms which generate propulsive thrust principally parallel to the aircraft longitudinal axis, which possesses the lowest levels of cross-flow drag in a given flight mode, which for conventional aircraft is the body x-axis.
  • Convertible aerial vehicle have historically been able to achieve higher speeds than helicopters while maintaining some form of hover flight capability. At least one embodiment of an aerial vehicle disclosed herein, however, promises to have even greater hover efficiency by boosting system-level Figures of Merit by 2% to 5% over a helicopter. At least one embodiment of a convertible aircraft described herein generates strong airflows along its body-x axis in hovering flight, which is tilted approximately 90° to the horizontal, and the body-x axis is the axis of lowest drag presentation. The total crossflow drag is, therefore, mitigated with respect to helicopters. Another pair of features reducing drag along the body longitudinal axis are the comparatively low wetted area and the form factor.
  • This low wetted area is an artifact of the relaxation of stall constraints which allows lifting surfaces to shrink with respect to the sizes required for takeoff and landing required by airplanes. With shrunken lifting surfaces, the low wetted areas present much lower drag than that caused by much larger wings which are typically found on conventional aircraft of the same weight.
  • aerial vehicles generally.
  • at least one aerial vehicle herein may be used in a larger-scale aerial vehicle, such as an unmanned aerial vehicle.
  • unmanned aerial vehicles may include the following ranges of size: from 2 centimeters (cm) to 5 meters (m) in main propeller diameters.
  • a ducted fan, small jet engine, rocket engine, other aerodynamic propulsor, or combinations thereof may be used.
  • an aerial vehicle 308 may include propellers 302 that may be mounted between a forward wing set 326 and an aft wing set 328; neither at the front, nor at the back of the aircraft.
  • the forward wing set 326 and aft wing set 328 may be mounted to a central body 330 having a longitudinal body axis 332 extending therethrough.
  • the central body 330 may include at least one bay which may be of any cross-sectional geometry or size and may house things like batteries, receiver and/or transmitter electronics, sensors, general cargo, or combinations thereof.
  • the mounting position of the propellers 302 may allow the vehicle 308 to shield the propellers 302 from objects above (i.e. , in the longitudinal axis 332 of the body 302 - including tree branches or light fixtures as the aircraft is caught in a ceiling suction toroid) or below.
  • the leading edge 334 of the forward wing set 326 may be both structural and load-bearing to the point that they accommodate a protective undercarriage assembly 336 which both ties into and/or forms the vehicle 308 primary structure.
  • the undercarriage assembly 336 may be positioned in and/or attached to the forward portion of the vehicle 308 rather than the aft portion of the vehicle 308, which may reduce or remove any destabilizing shift in center of gravity.
  • Legs 338 of the undercarriage assembly 336 and/or propeller cages may extend beyond the radial outermost point of the propellers 302, thereby shielding the propellers 302 from damage in the event of a rough landing or crash.
  • shielding the propellers 302 may reduce or eliminate the probability of striking an individual with the propellers 302 and/or the probability of an injury in the event of a strike may be reduced.
  • an undercarriage assembly 336 may generate a pitchforward stabilizing increment as the aerodynamic center lies below the propeller 302 planes and center of gravity of the vehicle 308.
  • the crossflow drag of the landing pads 340 may further accentuate stabilizing pitchforward moments.
  • the landing pads 340 may be connected to the undercarriage assembly 336 using a connection of variable compliance to allow tunable damping, compliance, and energy absorption upon landing or obstacle strike.
  • the aerial vehicle 308 may be increased in structural strength by fixing the undercarriage assembly 336 directly into the forward wing set 326 primary structure while possessing extremely low levels of wetted area and form drag as it presents a low-drag aerodynamic profile. Because of the low wetted area increments, the crossflow drag may be between one to three orders of magnitude less than a propeller guard in hover. In forward flight, the geometry of the undercarriage assembly 336 is such that the low wetted area increments mean that the corresponding equivalent flat plate drag increment may also be an order of magnitude lower than that of a propeller guard.
  • the translational flight drag may be further reduced as the dynamic pressure ratio at that location is approximately 1.0.
  • Propeller guards of conventional aircraft generally operate at substantially higher dynamic pressure ratios which drives up their drag increments (typically due to scrubbing drag) even further relative to an undercarriage assembly 336 arrangement, especially considering that their form drag is high as well as wetted area.
  • the aerial vehicle 308 may include turning vane flaps 342 movable relative to the aft wing set 328 by a hinge 344 or other pivoting connection. The turning vane flaps 342 may lie below the propellers 302 and firmly in the propeller slipstreams.
  • This orientation may facilitate execution of full pitch, roll and yaw control moments about the center of gravity.
  • at least one of the embodiments of an aerial vehicle 308 may easily execute rotation-free translations and execute body-level stationkeeping even in the presence of high gust fields.
  • the aircraft may be kept in moment equilibrium with the deck level in hovering flight while turning vanes apply net forces along the transverse body axes in either direction. Longitudinal body axis 332 position control may be maintained via propeller thrust manipulation coming from speed and/or blade feathering angle variations.
  • At least one embodiment of an aerial vehicle 308 will maintain extremely high levels of pitch control authority useful for conversion between hover and translational flight modes and maintenance of flight stability in the transition corridor.
  • pitch control may be executed independently and collectively via variations of the thrust between the propellers 302 which are displaced from each other in the transverse direction relative to the body 330 (i.e. fuselage) as well as turning vane flap 342 deflections, which generate elevator-equivalent pitching moments.
  • Movement of the aerial vehicle 308 may be defined relative to an x-, y-, and z- axis reference frame as depicted in FIG. 4.
  • the x-direction may be parallel to the longitudinal axis 332 of the vehicle 308 and the x- and y-directions may be transverse directions perpendicular to one another.
  • Roll control about the x-axis may be established in at least one embodiment by differential speed control of propellers 302 and/or turning vane flap 342 deflections.
  • Yaw control about the body 330 z-axis may be similarly controlled by differential speed control of the propellers 302 displaced laterally along the body 330 y-axis and/or turning vane flap 342 deflections which generate rudder- equivalent moments about the body 330 z-axis.
  • Translational control along y- and z-axes of the aerial vehicle 308 may be provided by maintaining moment equilibrium about the two axes via thrust manipulation from the propellers 302 while simultaneously executing rudder-equivalent and/or elevator-equivalent turning vane flap 342 deflections.
  • Translational control along the x- axis may be obtained by direct thrust variations via speed control of the propellers 302.
  • the control aspects may include as many as eleven degrees of freedom.
  • Embodiments with higher number of wing pairs in the forward wing set 326 and the aft wing set 328 and/or propellers 302 may possess even higher numbers of degrees of freedom.
  • At least one embodiment of an aerial vehicle 308 incorporates an overall configuration which is extremely low drag in converted, translational flight, which synergistically lends efficient hover properties as well.
  • Multi-propeller aerial vehicles typically use truss or round-bar arm designs to support the propellers 302.
  • the support arms create nontrivial crossflow blockage drag, as the support arms sit directly below the propeller in the high dynamic pressure region of the flow.
  • At least one embodiment of an aerial vehicle according to the present disclosure excludes support arms and/or may include aerodynamic fairings 346 immediate behind the propellers 302, where the fairings 346 may be fixed to the aft wing set 328.
  • the drag associated with support arms may be unacceptable in convertible flight (i.e. , flight from hover to translational flight).
  • the total blockage drag of the design may be one to two orders of magnitude lower in a hover and at certain boattail heights above the ground may actually produce lifting thrust.
  • Embodiments of aerial vehicles 308 without truss or round-bar support arms directly below the propeller may lead to overall hover efficiencies which are significantly greater than conventional multi-propeller toys and even conventional helicopter toys.
  • the total power required to hover will be reduced, which in turn, may shrink battery sizes relative to the other designs, which lowers weight, component, and manufacturing costs.
  • At least one embodiment of an aerial vehicle toy includes this beneficial property, which shrinks gross weights. Because the weights of the embodiments having this design will be lower than a conventionally configured aerial vehicle, it will not only cost less, but it will tend to be much more robust as inertial loads during object strike will be lower and product safety will be similarly enhanced beyond just those levels which are provided by the unique undercarriage assembly 336.
  • propeller torque is exactingly countered, not by a tail rotor which consumes 10% - 15% of the main rotor power, but by balancing lifting propellers 302, which counter torque with no parasitic losses such as seen in a conventionally configured helicopter.
  • the aerial vehicle 308 may include a nose 348 that can be of an aerodynamically faired configuration allowing smooth passage of air in both hover and translational flight modes and may have holes or slots allowing for induction of an internal airflow to cool internal electronics and batteries.
  • a number of storage bays 350 may be included, that may hold a variety of devices from stability augmentation systems to sensors to general cargo to energy storage devices.
  • the aerial vehicle 308 may include an aft body portion 352.
  • the aft body portion 352 can house a variety of mission packages and/or cargo.
  • the aft body portion 352 can be substantially empty to maintain proper weight and balance distributions of the aerial vehicle 308 as a whole.
  • the aerial vehicle 308 may include one or more powerpods 354.
  • the one or more powerpods 354 may have a comparatively high aspect ratio configuration (i.e. , ratio of a longitudinal dimension to a transverse dimension) and may support propellers 302 structurally from the front and back while passing structural loads through the motor shaft via, for example, bearing assemblies.
  • the propellers 302 may be foldable, flexible, frangible and/or deformable for packaging, flight safety and robustness.
  • At least one motor 356 may provide shaft power to the propellers 302 to turn them in a variety of directions and speeds depending on the number of wings and associated powerpod 354 assemblies.
  • the aerial vehicle 308 may include the fairings 346.
  • the fairings 346 may act as structural supports for the at least one motor 356 and/or termina of the aft wing set 328, undercarriage assembly 336, alighting assemblies, other structural or shielding components, or combinations thereof.
  • the aerial vehicle 308 may include forward wing set 326 that may support the forward sections of the powerpods 354 structurally by passing structural loads directly to a forward body portion 358.
  • the aerial vehicle 308 may include landing gear, such as the undercarriage assembly 336 with legs 338 and landing pads 340.
  • the forward wing set 326 may integrate the landing gear and pass landing loads from the undercarriage assembly 336 directly to the forward wing set 326 primary structures.
  • the aerial vehicle 308 may include an aft wing set 328 that may structurally connect the powerpods 354 to the aft body portion 352.
  • the forward wing set 326 and the aft wing set 328 may contain a variety of structural members and/or electrical lines to sustain and/or control flight.
  • the aft wing set 328 may structurally support turning vane flaps 342.
  • FIG. 5 illustrates another embodiment of an aerial vehicle 408 having a configuration with more than one set of propellers 402 per powerpod 454 which may be rotated in the same or opposite directions.
  • the propellers 402A, 402B may be driven by motors in both the forward and aft portions of the powerpods 454A, 454B.
  • the undercarriage assembly 436 may be amenable to the formation of a propeller cage 460 or protective basket which may allow for safe flight to protect the propellers 402 from obstacles and similarly protect the object or people from the propellers 402.
  • the vertical basket arches 462 may connect to a basket hoop 464 which may fully enclose the propellers 402 in a low-drag configuration.
  • the aerial vehicle 408 can also be equipped with binocular sensors like pinhole cameras 468A, 468B which may be laterally displaced to offer an operator both parallax and depth perception via displacement along the body y-axis.
  • the aerial vehicle 408 can also be equipped with monocular sensors 470 mounted on pan- tilt-zoom assemblies in any portion of the aerial vehicle 408.
  • Antennae of a variety of configurations may be mounted on any portion of the aerial vehicle 408 and/or incorporated into the body 430 or undercarriage assembly 436.
  • an aerial vehicle may be flown in first person via a vision aided system, leading to a first- person view (FPV) piloting scheme.
  • An aerial vehicle may be flown by waypoint navigation scheme, third-person flight modes, arcade or a hybrid of any of the above.
  • FIG. 6 illustrates an embodiment of an aerial vehicle 508 that is a conversion training variant which may include a number of features which assist in stabilizing conversions between hover flight and translational flight.
  • the aerial vehicle 508 may include a removable training wing set 572 configured to supplement the wing sets of the aerial vehicle 508.
  • the aerial vehicle 508 may have a forward wing set 526A connected to the body 530 and mounted forward of the propellers 502.
  • the forward wing set 526A may be structurally supported by an undercarriage assembly 536 that extends radially and aftwardly, at least partially defining the leading edge of the forward wing set 526A.
  • the removable training wing set 572 may include a relatively large training forward wing set 526B that is configured to connect to the body 530 and/or the leading edge of the forward wing set 526A and supplement the forward wing set 526A.
  • the removable training wing set 572 may include a relatively large training aft wing set 528B that is configured to connect to the body 530 and/or the training forward wing set 526B.
  • the size, and hence drag, of the training aft wing set 528B may be so great that they may induce a large aftward shift along the body x-axis of the aerodynamic center of the aerial vehicle 508.
  • Embodiments including an oversized training aft wing set 528B may aid pilots, such as novice pilots who are learning how to convert flight modes.
  • the removable training wing set 572 can more than double the wetted area, the removable training wing set 572 is not generally suitable for high speed flight.
  • the removable training wing set 572 may be removed, for example, once the pilot gains experience and confidence with conversion.
  • the removable training wing set 572 may be a single structural component that is selectively connectable to the aerial vehicle 508 as a whole. In other embodiments, the removable training wing set 572 may have discrete components that a user may selectively apply to the aerial vehicle 508 for different training purposes and/or flight characteristics. For example, the training forward wing set 526B and the training aft wing set 528B may be applied and/or removed from the aerial vehicle 508 independently from one another. As with many training schemes, the training forward wing set 526B and the training aft wing set 528B may come in a variety of chords and spans so that the level of stability may be gradually reduced with increasing levels of pilot skill and confidence.
  • FIG. 7 illustrates yet another embodiment of an aerial vehicle 608 with the undercarriage assembly removed and a set of forward propellers 602C mounted forward of the forward wing set 626 and forward of the propellers 602A mounted between the forward wing set 626 and aft wing set 628.
  • Forward propellers 602C, and associated motor assemblies 656C can be mounted to the body 630 and/or forward powerpods 654C and used to boost maximum flight speeds, both in hover flight and translational flight modes; however because the propellers lie outside of the protection of the space between the forward wing set 626 and aft wing set 628, this configuration may be reserved for more experienced pilots.
  • the position of the forward propellers 602C may induce a power-on forward shift in effective aerodynamic center position and accordingly reduce the total static margin.
  • fixed or movable stabilizers 674 may be included for both stabilization and control.
  • FIG. 8 is a lateral view of an embodiment of an aerial vehicle 708 along the body y-axis illustrating the aerial vehicle 708 in hover flight.
  • the aerial vehicle 708 may include a plurality of propellers 702 which may each generate a yawing moment 776.
  • These yawing moments 776 are a function of propeller types, pitch angles, rotational speeds and directions which may be varied, from flight to flight or in-flight.
  • the thrust vector 778 of each propeller 702 may be manipulated for control of moments about the center of mass 780 of the aerial vehicle 708.
  • Turning vane flaps may generate elevator forces 782 in elevator-equivalent and rudder-equivalent directions.
  • These force vectors may be varied with respect to each other to generate pitching moments about the center of mass 780, either positive or negative. If the sum of the thrust vectors 778 from the propellers 702 on a first lateral side of the aerial vehicle 708 is greater than the sum of the thrust vectors 778 from the propellers 702 on a second lateral side of the aerial vehicle 708, then the aerial vehicle 708 pitches around the center of mass 780, providing all other force vectors remain unchanged.
  • the elevator forces 782 are represented by the two visible components of those vectors. The elevator forces 782 may manipulate the aerial vehicle 708 in z-axis translational motions as well as generate pitching moments about the aircraft center of mass 780.
  • FIG. 9 is a top-view of the aerial vehicle 708 of FIG. 8 in fully-converted translational flight.
  • the elevator forces 782 may manipulate the aerial vehicle 708 in y-axis translational motions as well as generate yawing moments about the aircraft center of mass 780.
  • These force differentials i.e. , pitch, roll, yaw
  • FIG. 10 illustrates how an embodiment of an aerial vehicle 808 may maintain deck-level translations and equilibrium during relative movement of the aerial vehicle 808 and the surrounding air.
  • the aerial vehicle 808 in a quiescent flight condition with a farfield freestream velocity near zero exhibits essentially no cross-flow drag, D ⁇ 0.
  • a crossflow-drag component 886 will go to a non-zero value.
  • the pilot and/or flight director may command the turning vane flaps 842 to generate countering lateral elevator forces 882.
  • the thrust force of the windward propellers 878 A may be reduced with respect to the thrust force of the leeward propellers 878B while the sum of thrust force of the windward propellers 878A and thrust force of the leeward propellers 878B is at the same level as when the aerial vehicle 808 was in hover flight with zero cross-flow.
  • This differential in thrust force 878A, 878B may generate a counterclockwise moment about the center of mass 880 which may be used to exactly counter a clockwise moment generated by the elevator force 882 generated by the turning vane flaps 842. Accordingly, the aerial vehicle 808 may be kept in exact force and moment equilibrium with a level deck.
  • FIG. 11 illustrates a plurality of guidance, navigation, and flight command signals that may be transmitted to an aerial vehicle 908.
  • a conventional radio controller 988 may be used to directly and/or indirectly communication pilot commands to the aerial vehicle 908 via a signal in the electromagnetic spectrum.
  • the pilot commands may be transmitted to a receiver unit 990 within the aerial vehicle 908 which may be attached to one or more antennae.
  • one or more satellites 992 can send a number of electromagnetic signals to the aerial vehicle 908 so as to provide spatial orientation to the receiver unit 990.
  • the aerial vehicle 908 may also be fitted with a plurality of proximity sensors 994 operating in acoustic and/or radio frequencies using electromagnetic waves or optical or infrared signals. These signals may be used to increase situational awareness for pilot- commanded flight and/or used as part of an automatic or semi-automatic flight control system.
  • FIG. 12 illustrates an embodiment of a data flowchart 901 depicting data flow through a flight director with inner loop stability augmentation system (SAS) 903 and an outer loop guidance, navigation, and control (GNC) system 905.
  • SAS inner loop stability augmentation system
  • GNC navigation, and control
  • a plurality of sensors may be used to determine atmospherics information 907 and provide the atmospherics information 907 to the flight director.
  • One or more onboard sensors in a collision avoidance and obstacle spatial proximity system may also provide collision avoidance information 909 and aid in establishing aircraft and operator situational awareness.
  • Collision avoidance information 909 may be supplied with pilot commands 911 to the outer GNC system 905 which feeds data to the aerial vehicle only upon mixing within an inner SAS 903.
  • the outer GNC system 905 may receive a waypoint schedule 913 that is at least partially provided by communication with one or more satellites 992, described in relation to FIG. 11.
  • the outer GNC system 905 and inner S AS 903 may provide power and flight control surface commands 915 to the aerial vehicle 908 to move the aerial vehicle 908 according to the pilot commands 911 in light of the atmospherics information 907, collision avoidance information 909, and the necessary modifications to maintain stability according to the inner SAS 903.
  • the aerial vehicle 908 may move in the intended direction and relay back flight state information 917 to the inner SAS 903 and the outer GNC system 905.
  • the flight state information may include pitch, orientation, speed, acceleration, inertial moments, altitude, position, other values, or combinations thereof.
  • FIG. 13 shows a pair of aerial vehicles 1008 engaging in combat using a form of radio frequency, optical, infrared, UV, or other electromagnetic beam targeting an opposing aircraft.
  • the result of a beam strike could be the emission of a sound signaling a hit, a loss of power, a prescribed aircraft maneuver and/or loss of power or complete motor shut-down.
  • Other activities may include using an embodiment of an aerial vehicle 1108 to loft a given payload 1119A as shown in FIG. 14.
  • a payload may be any form of harmless game-related substance and under current FAA rules may be flown indoors.
  • the payload 1119B in freefall may be safe to humans upon impact, such as a water- balloon, a shaving-cream filled balloon or a bag of flour.
  • the payload 1119A When mounted to the aircraft, the payload 1119A may be released by a remotely controlled release mechanism 1121.
  • Other pay loads may include liquids held in a reservoir which may be ejected from a nozzle 1123 a given distance like shaving cream or other effluents, such as SILLY STRING. In some embodiments, such a reservoir may be located within a body 1130 of the aerial vehicle 1108 and may be ejected from the nozzle 1123 upon receiving a command from the pilot or other operator.
  • FIG. 15 illustrates the internal core of the aerial vehicle 508 described in relation to FIG. 6.
  • the internal core may include an undercarriage assembly 536 and a support member 525.
  • the undercarriage assembly 536 and support member 525 may provide a structural framework upon with the plurality of powerpods 554 and propellers 502 may be mounted.
  • the core may include a flight director 527 in electrical communication with a plurality of sensors and/or communication modules to convert pilot commands and flight state information into flight commands, as described in relation to FIG. 12.
  • the core may include an energy storage device 529 in electrical communication with the flight director 527, the plurality of sensors, emitters, the communication module, the plurality of powerpods 554, any other devices described herein, or combinations thereof.
  • the flight director 527 may include an inertial measuring unit (IMU) which will send signals to a comparator which will mix motor command signals which will be amplified by the power electronics assembly.
  • IMU inertial measuring unit
  • the power electronics assembly will be used to drive indicator sound generators and/or lights to demonstrate to the operator different states of readiness and/or flight command levels.
  • the power electronics assembly will also send power to the powerpods 554.
  • the flight director 527 may be shock mounted on a piece of mounting material 531 which is designed so as to provide both equivalent spring stiffness and damping so as to induce stable, controllable flight.
  • the undercarriage assembly 536 forms a straight structural triangle stretching between the energy storage device 529 and the support member 525.
  • the mounting material 531 may interface with the support member 525.
  • the support member 525 may have a light fill center or closed center. In the case of a closed center, powerpods 554 are connected at some distance from the center of the support member 525.
  • the support member 525 may include or be made of any comparatively stiff material like cast nylon or graphite-epoxy composite, which may surround softer material like foam, balsa or honeycomb or no material at all for an open configuration.
  • FIG. 16 shows the aerial vehicle 508 with a forward wing set 526 and body 530 affixed to the core of FIG. 15 and the aerial vehicle 508 with a nose 548 removed to provide access to the energy storage device 529.
  • the nose 548 may be polygonal, oval, irregular, or circular in cross section and may be composed of materials which are capable of accepting multiple impact loads from crashing into surfaces soft and hard.
  • the nose 548 may be filled with energy absorbing foam and may be made from sheet stock.
  • the nose 548 may be designed to aerodynamically shield the energy storage device 529 and seat over the forward portion of the body 530, which, in turn may have a polygonal, oval, irregular or circular cross section.
  • the body 530 transfers forward body structural loads, air, and D'Alembert's forces aft towards the forward sections of the undercarriage assembly 536.
  • the undercarriage assembly 536 may be stiffer, stronger and heavier per unit volume than the lifting surfaces (i.e. , forward wing set 526) which may be made from materials like polymer or metal honeycomb, foam, foil, paper or balsa, they have several effects on the section and whole surface aeroelastic stability.
  • the lifting surfaces can be made from comparatively lightweight materials, a longitudinal section across the wing would be composed of a stiff, strong, comparatively heavy leading edge 534 component as the undercarriage assembly 536 also forms the leading edge 534 of the forward wing set 526.
  • the undercarriage assembly 536 may be removable, the undercarriage assembly 536 may be integrated into the primary structure of the aerial vehicle 508. Accordingly, the undercarriage assembly 536 may be a load- bearing member through which landing, takeoff, flight, other loads, or combinations thereof are passed. Because a given longitudinal section of the forward wing set 526 and undercarriage assembly 536 shows a leading edge 534 reinforced by the undercarriage assembly 536, and the density of the undercarriage assembly 536 may be as much as two orders of magnitude greater than the density of the rest of the forward wing set 526, the section center of gravity is shifted forward in front of the section aerodynamic center, which, sub-sonically, will be close to the quarter-chord.
  • the torsional and flexural stiffnesses of the undercarriage assembly 536 may be greater than the torsional and flexural stiffnesses of the rest of the forward wing set 526, which trails the undercarriage assembly 536 in the longitudinal direction.
  • the effect of this geometric arrangement on sectional elastic axis is similar to that of the effect on the section center of gravity. Because the undercarriage assembly 536 is often two to five orders of magnitude greater in flexural and torsional stiffness than the rest of the forward wing set 526 which trails it, the elastic axis position quite often is far in front of the quarter-chord of the section, which is approximately the position of the section aerodynamic center. At least partially due to this structural arrangement, both the section center of gravity and the elastic axis may be positioned in front of the section aerodynamic center.
  • the leading edge of the wing set may be or include curved elements as shown in FIG. 17.
  • An embodiment of an aerial vehicle 1208 having a curvilinear undercarriage assembly 1236 may shrink the total aft body length by as much as a factor of two while maintaining an equivalent surface area of a forward wing set 1226.
  • the leading edge 1234 may include a curve in a range having upper and lower values including any of 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, or any values therebetween. For example, the leading edge 1234 may curve between 10° and 90°.
  • leading edge 1234 may curve between 20° and 50°. In yet other examples, the leading edge 1234 may curve about 30°.
  • FIG. 17 depicts the aerial vehicle 1208 with a removable nose 1248 removed to allow access to an energy storage device 1229 and/or other electronics.
  • FIG. 18 depicts an embodiment of an aerial vehicle 1308 including a canard wing set 1333 mounted to a body 1330 of the aerial vehicle 1308.
  • FIG. 19 depicts an embodiment of an aerial vehicle 1408 including a plurality of types of propulsors.
  • the aerial vehicle 1408 may include at least three aerodynamic propulsors of a first type, such as the propellers 1402 described herein, in combination with a propulsor of a second type.
  • the aerial vehicle 1408 may include at least three propellers 1402 located equidistant from a longitudinal axis 1432 of the aerial vehicle 1408 with a central mounting channel 1435 that may house a rocket propulsor 1437.
  • the rocket propulsor 1437 may be a solid fuel rocket, a liquid fuel rocket, staged rocket, other type of rocket, or combinations thereof.
  • the rocket propulsor 1437 may be mounted forward of the at least three propellers 1402. In other embodiments, the rocket propulsor 1437 may be positioned such that an exhaust path of the rocket propulsor 1437 may not overlap with the at least three propellers 1402.
  • the central mounting channel 1435 may be constructed of heat-resistant materials so as to resist the effects of ejection charges of the rocket propulsor 1437 at the conclusion of core burn. This configuration of rocket propulsor 1437 may be initiated by on-board or ground-based electronics and/or power and/or may be fired by a fuse type assembly. After the rocket propulsor 1437 is consumed, a recoil charge may or may not be used to eject the entire rocket propulsor 1437 or it may be retained for the rest of the flight.
  • the central mounting channel 1435 may place the rocket thrust vector straight through the aircraft center of mass and along the longitudinal axis 1432 for maintenance of flight stability upon motor firing.
  • a stated value should therefore be interpreted broadly enough to encompass values that are at least close enough to the stated value to perform a desired function or achieve a desired result.
  • the stated values include at least the variation to be expected in a suitable manufacturing or production process, and may include values that are within 5%, within 1%, within 0.1%, or within 0.01% of a stated value.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Remote Sensing (AREA)
  • Toys (AREA)

Abstract

L'invention concerne un véhicule aérien capable de vol convertible pour passer du survol au vol linéaire comprenant un corps ayant un axe de corps longitudinal, une pluralité d'ailes avant, une pluralité d'ailes arrière, au moins un moteur, et au moins trois propulseurs aérodynamiques entraînés par ledit au moins un moteur. Chaque aile avant s'étend dans un plan d'aile vers l'avant. Chaque aile arrière s'étend depuis un plan d'aile arrière. Les propulseurs aérodynamiques sont montés dans le sens longitudinal entre la pluralité d'ailes avant et la pluralité d'ailes arrière.
PCT/US2015/035150 2014-06-10 2015-06-10 Véhicules aériens et procédés d'utilisation Ceased WO2015191747A1 (fr)

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US201462010337P 2014-06-10 2014-06-10
US62/010,337 2014-06-10
US201462015100P 2014-06-20 2014-06-20
US62/015,100 2014-06-20
US14/734,864 US9878257B2 (en) 2014-06-10 2015-06-09 Aerial vehicles and methods of use
US14/734,864 2015-06-09

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CN105711834A (zh) * 2016-02-02 2016-06-29 深圳市高端玩具有限公司 旋翼推进垂直启飞式滑翔机及其飞行控制方法
CN112020465A (zh) * 2018-04-27 2020-12-01 Wing航空有限责任公司 用于飞行器的推力分配
CN113453982A (zh) * 2018-12-31 2021-09-28 极性移动Av有限公司 垂直起降飞机

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US20140131507A1 (en) * 2012-11-14 2014-05-15 Arash Kalantari Hybrid aerial and terrestrial vehicle

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US5289994A (en) * 1989-10-10 1994-03-01 Juan Del Campo Aguilera Equipment carrying remote controlled aircraft
US5060886A (en) * 1990-08-08 1991-10-29 Bell Helicopter Textron, Inc. Quick change wheel landing gear
US20020030142A1 (en) * 1996-09-06 2002-03-14 James Terry Jack Semiautonomous flight director
US20060038061A1 (en) * 2003-10-02 2006-02-23 Blevio Henry L Sr Aerodynamically stable, high-lift, vertical takeoff aircraft
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Publication number Priority date Publication date Assignee Title
CN105711834A (zh) * 2016-02-02 2016-06-29 深圳市高端玩具有限公司 旋翼推进垂直启飞式滑翔机及其飞行控制方法
CN112020465A (zh) * 2018-04-27 2020-12-01 Wing航空有限责任公司 用于飞行器的推力分配
CN112020465B (zh) * 2018-04-27 2024-03-12 Wing航空有限责任公司 用于飞行器的推力分配
CN113453982A (zh) * 2018-12-31 2021-09-28 极性移动Av有限公司 垂直起降飞机

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