The design and refinement of a tethered hovering platform into a feasible working system is presented. To determine a starting point for the design, a detailed historical search was conducted to find the history and the current state of such technology. Real world current needs are analyzed to produ
The design and refinement of a tethered hovering platform into a feasible working system is presented. To determine a starting point for the design, a detailed historical search was conducted to find the history and the current state of such technology. Real world current needs are analyzed to produce a mission specification and to drive the preliminary vehicle design. Analysis of environmental conditions and decisions about an initial payload package are made in conjunction with motor and propeller sizing. Initial concept testing to discover feasibility and operational issues was performed; from this, instability issues were discovered. Analyzing these instability issues using known rotorcraft and momentum effects, in conjunction with flight testing, yields possible solutions to the problem. The use of constrained layer dampers as a means of passive stabilization is addressed and suggested as the preferred solution. Testing of passive constrained layer damping verifies the stability of the solution. The system components and manufacturing cost is presented in comparison to current systems using active stabilization.
대표청구항▼
1. A tethered hovering platform adapted to hover above a base station, comprising: a propeller configuration selected from a group of propeller configurations consisting of a single propeller configuration, a counter rotating propeller configuration, a three propeller located co-planar configuration
1. A tethered hovering platform adapted to hover above a base station, comprising: a propeller configuration selected from a group of propeller configurations consisting of a single propeller configuration, a counter rotating propeller configuration, a three propeller located co-planar configuration and a four propeller located co-planar configuration;a propulsion configuration provided by a motor, connected to a gear system that drives the propeller configuration;said platform, including a thrust duct outer ring cylindrically ducting the motor and propeller configuration, said thrust duct outer ring having a periphery; anda damping device mounted cantilever from the periphery of the thrust duct outer ring, wherein the platform is attached to a base station by a tether attached to the damping device mounted cantilever from the periphery of thrust duct outer ring of the platform, and wherein said damping device is structured to deflect along its longitudinal axis to provide damping during flight. 2. The tethered hovering platform as recited in claim 1, further comprising multiple tethers attaching the base station to multiple damping devices mounted cantilever to a thrust duct outer ring of said platform. 3. The tethered hovering platform as recited in claim 2, where the damping devices are selected from a group consisting of constrained layer damping beams attached cantilever to the platform, spring mass damper fixtures, and miniature hydraulic damping fixtures. 4. The tethered hovering platform as recited in claim 3 further comprising high damping fixtures attached to the tethers and mounted on the base station. 5. The tethered hovering platform as recited in claim 1, where the damping devices are up-bent pre-loaded constrained layer damping beams for providing maximum damping and allowing the dampers to deflect to about a nearly flat horizontal plane in flight. 6. The tethered hovering platform as recited in claim 1, further comprising a PZT device attached to the dampers and operable to monitor and relay the damped and un-damped performance parameters of the craft. 7. The tethered hovering platform as recited in claim 6, where the PZT device further comprises a transmitter operable to transmit the damped and un-damped performance parameters to a receiver on the base station. 8. The tethered hovering platform as recited in claim 7, further comprising reactionary flight controls combined with passive damping techniques to provide necessary flight envelope expansion including gyro reactionary turning vanes and automated tension changing devices on the platform operable to respond to performance parameters transmitted by the PZT device. 9. The tethered hovering platform as recited in claim 7, further comprising reactionary flight controls combined with passive damping techniques to provide necessary flight envelope expansion including automated tension changing devices on the base station that aid in stabilizing the platform operable to respond to performance parameters transmitted by the PZT device. 10. The tethered hovering platform as recited in claim 1, further comprising reactionary flight controls combined with passive damping techniques to provide necessary flight envelope expansion including gyro reactionary turning vanes on the platform and automated tension changing devices on the platform or on the base station that aid in stabilizing the platform. 11. The tethered hovering platform as recited in claim 10, further comprising materials to reduce visual signature selected from a group consisting of color changing coatings, applications, and complicated patterns to reduce visibility for visual signature suppression techniques. 12. The tethered hovering platform as recited in claim 11, further comprising audible signature suppression implemented in the design to reduce the audible signature to minimal levels. 13. The tethered hovering platform as recited in claim 1, further comprising fixed and interchangeable payloads on the platform, where payloads are selected from a group consisting of visual sensors, radio communication equipment, and gas/atmospheric sensors for chemical. 14. A tethered hovering platform adapted to hover above a base station, comprising: a ducted propulsion configuration provided by a motor, connected to a gear system that drives a ducted propeller configuration, where the ducted propulsion configuration and the ducted propeller configuration includes a thrust duct outer ring cylindrically about the ducted propulsion configuration and the ducted propeller configuration;a platform, including the duct outer ring and a damping device mounted cantilever from a periphery of the duct outer ring, wherein the platform is attached to a base station by a tether attached to the damping device mounted cantilever from the periphery of said duct outer ring of the platform, and wherein said damping device is structured to deflect along its longitudinal axis to provide damping during flight. 15. The tethered hovering platform as recited in claim 14, further comprising multiple tethers attaching the base station to multiple damping devices mounted to the thrust duct outer ring of said platform. 16. The tethered hovering platform as recited in claim 15, where the damping devices are selected from a group consisting of constrained layer damping beams attached cantilever to the platform, spring mass damper fixtures, and miniature hydraulic damping fixtures. 17. The tethered hovering platform as recited in claim 16 further comprising high damping fixtures attached to the tethers and mounted on the base station. 18. The tethered hovering platform as recited in claim 15, where the damping devices are up-bent pre-loaded constrained layer damping beams for providing maximum damping and allowing the dampers to deflect to about a nearly flat horizontal plane in flight. 19. The tethered hovering platform as recited in claim 18, further comprising a PZT device attached to the damping devices and operable to monitor and relay the damped and un-damped performance parameters of the craft. 20. The tethered hovering platform as recited in claim 19, where the PZT device further comprises a transmitter operable to transmit the damped and un-damped performance parameters to a receiver on the base station. 21. The tethered hovering platform as recited in claim 20, further comprising reactionary flight controls combined with passive damping techniques to provide necessary flight envelope expansion including gyro reactionary turning vanes and automated tension changing devices on the platform operable to respond to performance parameters transmitted by the PZT device. 22. The tethered hovering platform as recited in claim 20, further comprising reactionary flight controls combined with passive damping techniques to provide necessary flight envelope expansion including automated tension changing devices on the base station that aid in stabilizing the platform operable to respond to performance parameters transmitted by the PZT device. 23. The tethered hovering platform as recited in claim 18, further comprising reactionary flight controls combined with passive damping techniques to provide necessary flight envelope expansion including gyro reactionary turning vanes on the platform and automated tension changing devices on the platform or on the base station that aid in stabilizing the platform. 24. The tethered hovering platform as recited in claim 18, further comprising materials to reduce visual signature selected from a group consisting of color changing coatings, applications, and complicated patterns to reduce visibility for visual signature suppression techniques. 25. The tethered hovering platform as recited in claim 18, further comprising audible signature suppression implemented in the design to reduce the audible signature to minimal levels. 26. The tethered hovering platform as recited in claim 18, further comprising fixed and interchangeable payloads on the platform, where payloads are selected from a group consisting of visual sensors, radio communication equipment, and gas/atmospheric sensors for chemical. 27. A tethered hovering platform adapted to hover above a base station, comprising: a ducted propulsion configuration provided by a motor, connected to a gear system that drives a ducted propeller configuration, where the ducted propulsion configuration and the ducted propeller configuration includes a thrust duct outer ring cylindrically about the ducted propulsion configuration and the ducted propeller configuration;a platform including the thrust duct outer ring and multiple damping devices mounted cantilever from a periphery of the thrust duct outer ring, wherein said platform is attached to a base station by multiple tethers attaching the base station to the multiple damping devices mounted cantilever from the periphery of a thrust duct outer ring of said platform, and wherein said multiple damping devices are structured to deflect along their longitudinal axes to provide damping during flight,where the damping devices are selected from a group consisting of constrained layer damping beams attached cantilever to the platform, spring mass damper fixtures, and miniature hydraulic damping fixtures. 28. The tethered hovering platform as recited in claim 27 where the damping devices are constrained layer damping beams attached cantilever to the platform and are up-bent pre-loaded constrained layer damping beams for providing maximum damping and allowing the dampers to deflect to about a nearly flat horizontal plane in flight. 29. The tethered hovering platform as recited in claim 28, further comprising a PZT device attached to the damping devices and operable to monitor and relay the damped and un-damped performance parameters of the craft, where the PZT device further comprises a transmitter operable to transmit the damped and un-damped performance parameters to a receiver on the base station. 30. The tethered hovering platform as recited in claim 29, further comprising reactionary flight controls combined with passive damping techniques to provide necessary flight envelope expansion including gyro reactionary turning vanes and automated tension changing devices on the platform operable to respond to performance parameters transmitted by the PZT device.
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이 특허에 인용된 특허 (5)
Gran Richard (Farmingdale NY) Proise Michael (Garden City NY), Active vibration damping arrangement for transportation vehicles.
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