Watercraft and electricity generator system for harvesting electrical power from wave motion

• US 9,353,725 B2
• Filed: 06/12/2014
• Issued: 05/31/2016
• Est. Priority Date: 06/28/2011
• Status: Active Grant

• Current Assignee: Liquid Robotics, Inc. (The Boeing Co.)
• Original Assignee: Liquid Robotics, Inc. (The Boeing Co.)
• Inventors: Hine, Roger G., Hine, Derek L.
• Primary Examiner(s): Olson, Lars A
• Application Number:
  US14/303,470
• Publication Number:
  US 20140290233A1
• Time in Patent Office: 719 Days
• Field of Search: 440/6, 440/9, 440/10
• US Class Current: 1/1
• CPC Class Codes: B63B 79/15 for monitoring environmental variables, e.g. wave height or weather data
• CPC Class Codes: B63H 1/32 Flaps, pistons, or the like, reciprocating in propulsive direction
• CPC Class Codes: B63H 19/02 by using energy derived from movement of ambient water, e.g. from rolling or pitching of vessels
• CPC Class Codes: B63J 2003/003 using photovoltaic power generation, e.g. using solar panels
• CPC Class Codes: B63J 3/02 from propulsion power plant
• CPC Class Codes: B63J 99/00 Subject matter not provided for in other groups of this subclass
• CPC Class Codes: F03B 13/10 Submerged units incorporating electric generators or motors
• CPC Class Codes: F03B 13/16 using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem"
• CPC Class Codes: F03B 13/1815 with an up-and-down movement
• CPC Class Codes: F03B 13/20 wherein both members , i.e. wom and rem are movable relative to the sea bed or shore
• CPC Class Codes: F05B 2240/931 which is a vehicle
• CPC Class Codes: Y02E 10/20 Hydro energy
• CPC Class Codes: Y02E 10/30 Energy from the sea, e.g. using wave energy or salinity gradient
• CPC Class Codes: Y02T 70/5236 Renewable or hybrid-electric solutions

Abstract

This disclosure provides improved nautical craft that can travel and navigate on their own. A hybrid vessel is described that converts wave motion to locomotive thrust by mechanical means, and also converts wave motion to electrical power for storage in a battery. The electrical power can then be tapped to provide locomotive power during periods where wave motion is inadequate and during deployment. The electrical power can also be tapped to even out the undulating thrust that is created when locomotion of the vessel is powered by wave motion alone.

Claims

1. A wave-powered vessel, comprising:

(a) a buoyant vessel body;

(b) a propulsion system that is structured to mechanically convert movement of the vessel body caused by wave motion to locomotive thrust;

(c) a first generating system that is structured to convert vertical movement of the vessel body caused by wave motion to electrical power; and

(d) a second generating system that is structured to convert horizontal movement of the vessel body through water to electrical power.

2. The wave-powered vessel of claim 1, wherein the first generating system comprises an underwater component that is tethered to and weighted to be suspended below the surface component such that wave motion on the body of water causes the surface component to rise and fall relative to the underwater component, said motion being harvested by the first generating system to produce electrical power.

3. The wave-powered vessel of claim 1, wherein the second generating system comprises a rotatory fin or turbine that rotates in response to horizontal movement of the vessel body through the water, said rotation being harvested by the second generating system to produce electrical power.

4. A wave-powered vessel, comprising:

(a) a buoyant vessel body;

(b) a propulsion system that is structured to mechanically convert movement of the vessel body caused by wave motion to locomotive thrust;

(c) a generating system that is structured to convert movement of the vessel body caused by wave motion to electrical power;

(d) a battery wired to receive electrical power generated by the generating system;

(e) an electrically powered motor wired to receive electrical power from the battery and positioned to provide locomotive thrust of the vessel through the water; and

(f) one or more solar panels configured to supply electrical power to the battery.

5. A dual power method for propelling a vessel smoothly along the surface of a body of water, the method comprising:

(a) harvesting motion of the vessel caused by and oscillating in accordance with waves on the body of water;

(b) mechanically converting at least some of the harvested motion so as to propel the vessel horizontally with oscillating thrust in a particular direction;

(c) generating electrical power;

(d) storing the electrical power; and

(e) retrieving electrical power from storage to drive an electrically powered motor in an oscillating fashion, thereby propelling the vessel in substantially the same direction in an alternating pattern with the oscillating thrust provided in step (b) and thereby smoothing the oscillating thrust.

6. The method of claim 5, wherein step (c) comprises converting some of the harvested motion of the vessel caused by and oscillating with waves on the body of water by way of a mechanically operated generating system that is actuated by the motion of the vessel.

7. The method of claim 5, wherein step (c) comprises harvesting horizontal motion of the vessel through the body of water and converting the harvested horizontal motion into electrical power.

8. The method of claim 5, wherein step (c) comprises harvesting solar power and converting the solar power into electrical power.

9. An apparatus configured for deployment on a body of water, comprising:

(a) a surface component that is buoyant;

(b) a separate underwater component configured and weighted to be suspended underwater; and

(c) one or more tethers connecting the surface component to the underwater component each through a corresponding swing arm mounted to the surface component or the underwater component;

(d) a generating system operably connected to the swing arm(s); and

(e) a battery electrically connected to the generating system;

wherein the apparatus is structured such that when it is deployed on a body of water, the underwater component is suspended underwater from the surface component by way of the tethers, and wave motion on the body of water causes the surface component to rise and fall relative to the underwater component, thereby moving the swing arms in a manner that oscillates with the wave motion,

wherein the moving of the swim arms drives the generating system to produce electrical power, which is then conveyed to the battery.

10. The apparatus of claim 9, wherein the swing arm(s) are pivotally mounted and spring loaded so as to assume a horizontal neutral position when the surface component and the underwater component in the absence of tension on the respective tether, but to assume an angular spring-loaded position when the surface component and the underwater component are pulling each other by way of the respective tether.

11. The apparatus of claim 10, wherein the generating system is operably connected to the swing arms such that potential energy released by returning from the spring-loaded position to the neutral position is converted by the generator to electrical power.

12. The apparatus of claim 10, wherein the swing arms are each connected to a linear hydraulic cylinder such that the spring-loaded position creates pressure to drive a hydraulic turbine generator.

13. The apparatus of claim 9, wherein each of the swing arms is pivotally mounted at the proximal end towards the upper surface of the underwater component, and the corresponding tether connects the distal end of the swing arm to the surface component.

14. The apparatus of claim 9, wherein each of the swing arms is pivotally mounted at the proximal end towards the lower surface of the surface component, and the corresponding tether connects the distal end of the swing arm to the underwater component.

15. The apparatus of claim 9, wherein there are at least two tethers with swing arms connecting the surface component to the underwater component, one of which swings horizontally in one direction, the other of which swings horizontally in the opposite direction.

16. The apparatus of claim 9, wherein the underwater component is a swimmer that comprises a plurality of fins or wings that mechanically provide locomotive thrust when actuated by rising and falling of the swimmer in the water, thereby pulling the surface component horizontally from the underwater component by way of the tether(s).

17. A wave-powered vessel, comprising

(a) a buoyant vessel body;

(b) a propulsion system that is structured to mechanically convert movement of the vessel body caused by wave motion to locomotive thrust;

(c) a generating system that is structured to convert movement of the vessel body caused by wave motion to electrical power;

wherein the generating system includes a surface component connected to an underwater component through one or more swing arms such that when the vessel is deployed on a body of water, wave motion on the body of water causes the surface component to rise and fall relative to the underwater component, thereby moving the swing arms in a manner that oscillates with the wave motion.

18. The wave-powered vessel of claim 17, wherein the rising and falling of the surface component relative to the underwater component also powers the propulsion system.

19. The wave powered vessel of claim 17, further comprising a swing arm control system configured to variably dampen movement of the swing arms whereby the proportion of wave motion used for electrical power generation can be reduced in favor of locomotive thrust.

20. The wave-powered vessel of claim 19, further comprising a microprocessor programmed to determine the appropriate priority between locomotion and electrical power generation, and to regulate the swing arm control system accordingly.

21. A wave-powered vessel, comprising

(a) a buoyant vessel body;

(b) a propulsion system that is structured to mechanically convert movement of the vessel body caused by wave motion to locomotive thrust;

(c) a generating system that is structured to convert movement of the vessel body caused by wave motion to electrical power;

wherein the propulsion system includes an underwater component that comprises fins or wings that mechanically provide locomotive thrust when actuated by rising and falling of the swimmer in the water, and

wherein the propulsion system comprises a fin control system configured to variably dampen movement of the fins or wings, whereby the proportion of vessel movement used for locomotive thrust can be reduced in favor of electrical power generation.

22. The wave-powered vessel of claim 21, further comprising a microprocessor programmed to determine the appropriate priority between locomotion and electrical power generation, and to regulate the fin control system accordingly.

23. The wave powered vessel of claim 21,

wherein the generating system includes a surface component connected to an underwater component through one or more swing arms such that when the vessel is deployed on a body of water, wave motion on the body of water causes the surface component to rise and fall relative to the underwater component, thereby moving the swing arms in a manner that oscillates with the wave motion, and

wherein the vessel further comprises a swing arm control system configured to variably dampen movement of the swing arms whereby the proportion of wave motion used for electrical power generation can be reduced in favor of locomotive thrust.

24. The wave-powered vessel of claim 23, further comprising microprocessor programmed to determine the appropriate priority between locomotion and electrical power generation, and to regulate the fin control system and the swing arm control system accordingly.

25. The wave-powered vessel of claim 22, wherein the microprocessor is programmed to regulate the fin control system in accordance with operating parameters transmitted to the microprocessor during operation of the vessel from an external control unit.