Steerable disk or ball

{
  "publication_number": "US11712637B1",
  "country": "US",
  "kind": "B1",
  "title": "Steerable disk or ball",
  "abstract": "A method of controlling a gyroscopically-stabilized projectile, comprising a control system producing a control signal, a rotating aerodynamic shell, and a reaction mass system responsive to the control signal, the method comprising: imparting rotational and translational kinetic energy to induce gyroscopic stabilization of the projectile about a gyroscopic axis and a movement of the projectile along a flight path; interacting the shell with surrounding air while moving, to induce aerodynamic forces; generating the control signal from the control system; and altering a state of the reaction wheel system selectively in dependence on the control signal, to alter the flight path.",
  "claims": [
    "1. A projectile, comprising: a surface configured to have aerodynamic interaction with an external fluid or gaseous medium having a relative motion with respect to the surface, the aerodynamic interaction comprising an aerodynamic lift having a lift force vector, the surface being configured to rotate about an axis of rotation and translate along an axis of translation; at least one controllable steering device configured to control the axis of translation of the projectile, selected from the group consisting of: an aerodynamic steering feature configured to selectively interact with the external fluid or gaseous medium to produce a controllable aerodynamic force; and a controllable displaceable steering mass configured to selectively alter the lift force vector; a motor, configured to control the at least one controllable steering device, to selectively alter the axis of translation of the projectile; a sensor configured to determine the axis of translation; and a motor control, configured to drive the motor dependent on at least a phase of motor rotation, a phase of rotation of the surface about the axis of rotation, and the determined axis of translation.",
    "2. The projectile according to claim 1, wherein the motor control comprises a phase locked loop receiving: a motor rotation phase signal having a phase dependent on motor rotation, a surface rotation phase signal, having a phase dependent on a rotational angle of the surface about the axis of rotation with respect to the determined axis of translation, and a control signal configured to control a relative phase of the motor rotation phase signal with respect to the surface rotation phase signal.",
    "3. The projectile according to claim 1, wherein the motor comprises a DC brush motor, and the motor control is configured to produce a motor drive signal comprising a pulse modulated signal to drive the motor.",
    "4. The projectile according to claim 1, wherein the motor comprises at least one of a brushless DC motor and a stepper motor, and the motor control produces a multiphase motor drive signal.",
    "5. The projectile according to claim 1, wherein the motor is configured to drive the aerodynamic steering feature which is exposed to the external fluid or gaseous medium, and which selectively produces a torque about the axis of rotation dependent on a phase of surface rotation.",
    "6. The projectile according to claim 1, wherein the controllable displaceable steering mass has at least one eccentric state with respect to the axis of rotation, and the motor is configured to displace the controllable displaceable steering mass about an axis of steering mass rotation.",
    "7. The projectile according to claim 2, wherein the motor control is configured to receive a remote control signal from a source external to the projectile.",
    "8. The projectile according to claim 2, wherein the sensor comprises at least one magnetometer, configured to determine the phase of rotation of the surface.",
    "9. The projectile according to claim 1, wherein the surface comprises a disk configured to rotate about a vertical axis and produce a vertical lift vector during movement along a horizontal axis of translation.",
    "10. The projectile according to claim 1, wherein: the surface comprises a disk configured to rotate about a vertical axis during movement along a horizontal axis of translation; the motor is configured to rotate at a same rate as a rate of rotation of the surface about the axis of rotation, having an axis of rotation normal to the axis of rotation, and being configured to rotate at least one element in a manner configured to produce as a result of translation of the surface in the fluid or gaseous medium, an average lift force vector over a cycle of rotation of the surface which causes a controlled torque about the axis of rotation; and the sensor comprises at least one of a magnetometer sensor and an inertial sensor.",
    "11. The projectile according to claim 1, further comprising an inclination sensor, configured to determine an offset of the rotational axis with respect to an external frame of reference, wherein the motor control is configured to drive the motor with a selective phase dependent on the determined offset.",
    "12. The projectile according to claim 1, wherein the aerodynamic steering feature is exposed through the surface, and comprises a structure which rotates along an axis normal to the axis of rotation and has radial asymmetry, such that an aerodynamic interaction of the aerodynamic steering feature with the external fluid or gaseous medium is dependent on an angle of rotation of the structure about the axis normal to the axis of rotation.",
    "13. The projectile according to claim 1, wherein the motor control comprises a radio frequency receiver configured to receive a control signal compatible with a communication protocol selected from the group consisting of WiFi and Bluetooth.",
    "14. The projectile according to claim 13, further comprising a computer readable medium for a smartphone, storing therein non-transitory instructions for controlling the projectile by execution of the non-transitory instructions.",
    "15. The projectile according to claim 1, further comprising at least one processor configured to implement at least a portion of a distributed ledger, wherein the motor control is responsive to commands dependent on the distributed ledger.",
    "16. The projectile according to claim 1, further comprising a second motor configured to rotate an aerodynamic lift element to produce active lift for the projectile.",
    "17. The projectile according to claim 1, further comprising a mass redistributor, configured to selectively alter a moment of inertia of the surface.",
    "18. A projectile configured to spin during flight along a translational axis, comprising: an aerodynamic surface configured to spin about an axis of rotation, and to produce aerodynamic lift having a lift force axis based on translational movement along the translational axis; an element configured to rotate about an axis non-parallel with respect to the axis of rotation during flight of the projectile, and to produce an aerodynamic force having a net aerodynamic force axis in at least one state which is different from the lift force axis and the translational axis; a sensor for determining a phase of rotation of the element; and a controller configured to selectively control the phase of rotation of the element selectively dependent on at least the determined phase of rotation of the element, a phase of rotation of the spin of the aerodynamic surface, and the translational axis, wherein the element generates a net steering force with respect to an external frame of reference based on the net aerodynamic force, to control a trajectory of the projectile.",
    "19. The projectile according to claim 18, wherein the element comprises an aerodynamic feature exposed through the aerodynamic surface, having aerodynamic characteristics selectively dependent on the phase of rotation of the aerodynamic feature, wherein the aerodynamic force produced by the aerodynamic feature is altered as the aerodynamic surface spins about the axis of rotation; and the controller comprises a phase locked loop which controls rotation of a motor, receiving a motor rotation phase signal dependent on a rotation of the motor, an aerodynamic surface rotation phase signal having a phase dependent on a rotational phase of the aerodynamic surface about the axis of rotation, and information about the translational axis, and producing a motor control signal dependent on a relative phase of the motor rotation phase signal and the aerodynamic surface rotation phase signal.",
    "20. A method of steering a rotating projectile having an axis of translation along a trajectory, having an aerodynamic surface configured to spin about an axis of rotation, and an element configured to rotate about an axis different from the axis of rotation, comprising: determining a rotation phase of the projectile about the axis of rotation with a first sensor; determining a rotation phase of the element; and controlling a phase of rotation of the element based on at least the determined rotation phase of the element, the phase of rotation of the projectile, and the axis of translation, wherein the element generates a net steering force on the projectile with respect to an external frame of reference to control the trajectory."
  ],
  "description_excerpt": "The present application relates to a systems and methods for controlling a flight path and/or steering force on a moving projectile than may be subject to rotation.\n\nEach reference cited herein is expressly incorporated by reference in its entirety. These incorporations are intended to provide written description for aspects of the invention, to provide enabling teachings, regardless of field of specialization, and to define useful combinations and contexts of use. Reference citation is not intended to admit prior art or analogous art status, which is determined by 35 USC §§ 102, 103. The scope of the claims herein are expressly limited to the patent eligible (e.g., non-abstract) embodiments disclosed herein, and any interpretation that encompasses merely abstract ideas or natural principals is hereby disclaimed. This shall be an express governing principal, and shall override any extrinsic evidence.\n\nThe “Frisbee®” is a well-known flying disk toy that is typically formed as an integral aerodynamic rigid tough plastic shell, in a dished shape of about 8-12 inches in diameter, with a weight of about 110-200 gm, with a typical design having a standard weight of about 175 gm and 10.75″ (27.5 cm) diameter (e.g., Ultimate Frisbee). It is thrown with an applied torque, such that it acquires spin as it is launched, i.e., has rotational and translational components to its motion vector. An inverted dish shape provides lift, while drag on the exterior surface(s) also impact aerodynamics.",
  "cpc": [
    "A63H 33/18",
    "A63B 2225/01",
    "A63B 2225/20",
    "A63B 2225/50",
    "A63H 27/00",
    "A63H 30/04",
    "F42B 10/025",
    "F42B 10/62",
    "F42B 10/64",
    "F42B 15/01",
    "G05D 1/0022",
    "G05D 1/105"
  ],
  "ipc": [
    "A63H 27/00",
    "A63H 30/04",
    "A63H 33/18",
    "F42B 10/02",
    "F42B 10/62",
    "G05D 1/00",
    "G05D 1/10"
  ],
  "inventors": [
    "Steven M. Hoffberg"
  ],
  "filing_date": "2019-03-25",
  "publication_date": "2023-08-01",
  "grant_date": "2023-08-01",
  "priority_date": "2018-03-23",
  "application_number": "US-201916363305-A",
  "family_id": "87472819",
  "cited_by_count": 19,
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