IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0780122
(2013-02-28)
|
등록번호 |
US-8893634
(2014-11-25)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
12 |
초록
▼
An anti-friction slip plate for mounting on a hull of a marine vessel to reduce skin friction drag by acoustically generating microcavitation bubbles at a wetted area of the hull. The slip plate comprises a plate-like enclosure, an energy extraction mechanism to extract power from water current flow
An anti-friction slip plate for mounting on a hull of a marine vessel to reduce skin friction drag by acoustically generating microcavitation bubbles at a wetted area of the hull. The slip plate comprises a plate-like enclosure, an energy extraction mechanism to extract power from water current flowing along the hull when underway, a power generator driven by the energy extraction mechanism to produce electrical power, an acoustic signal generator powered by the power generator to produce an acoustic signal, and a series of transducers excited by the acoustic signal to effect emission of acoustic waves that produce cavitation bubbles in the wetted area. A bottom surface of the slip plate serves as an acoustic diaphragm to impart cavitation bubbles at the wetted area interface. Optionally, a controller and/or status monitor may be provided to control and/or visual monitoring of power, acoustic frequency, intensity, duty cycle, or other parameters according to a condition of operation of the vessel or a condition of the water medium at the interface.
대표청구항
▼
1. A self-powered slip plate that mounts on a hull of a marine vessel to reduce skin friction drag by generating cavitation bubbles underneath the hull, said slip plate comprising: a substantially flat, low-profile enclosure to house acoustic components,a series of ultrasonic transducers disposed in
1. A self-powered slip plate that mounts on a hull of a marine vessel to reduce skin friction drag by generating cavitation bubbles underneath the hull, said slip plate comprising: a substantially flat, low-profile enclosure to house acoustic components,a series of ultrasonic transducers disposed in said enclosure to generate acoustic waves from a diaphragm defined by a lower surface of said enclosure,an energy extraction mechanism driven by water flow along said hull due to speed of said vessel,a power generator responsive to said energy extraction mechanism to produce electrical power, andan ultrasonic signal generator responsive to said electrical power to generate an acoustic signal to energize said transducers to produce said acoustic waves of an intensity to nucleate cavitation bubbles at a water-diaphragm interface water as said vessel proceeds over water. 2. The slip plate of claim 1, wherein said energy extraction mechanism comprises an impeller having vanes that engage water to rotate said impeller in response to speed of said vessel over water. 3. The slip plate of claim 2, further comprising a shaft interconnecting said impeller and said power generator, said shaft including a torque-limiting clutch to limit the rotational speed of said power generator. 4. The slip plate of claim 3, wherein said impeller comprises a flexible rubber material. 5. The slip plate of claim 1, wherein said acoustic generator is disposed within and hermetically sealed inside said enclosure. 6. The slip plate of claim 5, further including an uninterrupted metallic thermal conduction path between at least one component of said acoustic generator and an outer portion of said enclosure to provide a heat sink path to dissipate heat produced by said generator. 7. The slip plate of claim 2, wherein said power generator comprises a rotor and stator disposed within said enclosure. 8. The slip plate of claim 5, wherein said power generator comprises a permanent magnet generator. 9. The slip plate of claim 1, further comprising a frame that mounts to the hull of the vessel, said frame having a receptacle to receive and secure said slip plate in operative relation with said hull. 10. The slip plate of claim 9, wherein said frame includes a tapered or bevel fore section to aid surface-planning of said vessel. 11. The invention of claim 1, further including a controller on board said vessel that communicates with components of said slip plate to enable a vessel operator to control acoustic waves produced by said transducers. 12. The invention of claim 11, further including a status monitor on board said vessel to enable the vessel operator to visually monitor said power, transducer operation, or acoustic waves. 13. The invention of claim 12 comprising multiple slip plates for mounting abeam on a vessel hull wherein said controller and said status monitor provide control and monitoring of power, transducer operation, or acoustic waves of each said slip plate. 14. The invention of claim 11, wherein said controller enables control of intensity, frequency and/or duty cycle of acoustic waves produced by said transducers in accordance with a condition of operation of said vessel. 15. The invention of claim 1, wherein said enclosure includes reinforcement therein to prevent collapse or to compressively strengthen enclosure in the vertical direction, which reinforcement may include an internal honeycomb structure or web support structure or non-conductive filler material. 16. The invention of claim 1, further including a closed cell foam material to fill a void space inside the enclosure. 17. The invention of claim 1, further comprising a thermal conduction path including metallic webs interconnecting the stator of said power generator and an outer portion of said enclosure to provide cooling of said generator. 18. The invention of claim 1, wherein said enclosure comprises modular sections to provide separable but interconnected compartments for at least one of said energy extraction mechanism, said ultrasonic signal generator, and said transducers whereby to enable replacement and repair individually. 19. The invention of claim 2, wherein physical properties of vanes of said energy extraction mechanism substantially define rotational speed or torque applied to said power generator according to a speed threshold of the vessel. 20. An anti-friction slip plate for attachment to a marine hull to reduce skin friction drag comprising an enclosure the houses acoustic components, an energy extraction mechanism to extract energy from the relative movement of water along the hull of the vessel when underway, an electrical power generator driven by the energy extraction mechanism to provide a power source, an acoustic signal generator powered by the power source to produce an acoustic signal, and a series of transducers excited by the acoustic signal to acoustically generate acoustic waves having an intensity and frequency to produce microcavitation bubbles at an interface between the slip plate and water.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.