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WO2010047677A1 - Convertisseur d’énergie houlomotrice avec oscillateur interne masse-ressort - Google Patents

Convertisseur d’énergie houlomotrice avec oscillateur interne masse-ressort Download PDF

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Publication number
WO2010047677A1
WO2010047677A1 PCT/US2008/012092 US2008012092W WO2010047677A1 WO 2010047677 A1 WO2010047677 A1 WO 2010047677A1 US 2008012092 W US2008012092 W US 2008012092W WO 2010047677 A1 WO2010047677 A1 WO 2010047677A1
Authority
WO
WIPO (PCT)
Prior art keywords
spring
reaction mass
shell
wec
constant force
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
Application number
PCT/US2008/012092
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English (en)
Inventor
David B. Stewart
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ocean Power Technologies Inc
Original Assignee
Ocean Power Technologies Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ocean Power Technologies Inc filed Critical Ocean Power Technologies Inc
Priority to PCT/US2008/012092 priority Critical patent/WO2010047677A1/fr
Publication of WO2010047677A1 publication Critical patent/WO2010047677A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
    • F03B13/14—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy
    • F03B13/16—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem"
    • F03B13/20—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" wherein both members, i.e. wom and rem are movable relative to the sea bed or shore
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
    • F03B13/14—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy
    • F03B13/16—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem"
    • F03B13/18—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore
    • F03B13/1845—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore and the wom slides relative to the rem
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/90—Mounting on supporting structures or systems
    • F05B2240/93—Mounting on supporting structures or systems on a structure floating on a liquid surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2250/00—Geometry
    • F05B2250/40—Movement of component
    • F05B2250/44—Movement of component one element moving inside another one, e.g. wave-operated member (wom) moving inside another member (rem)
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient

Definitions

  • This invention relates to apparatus for converting energy present in surface waves of large bodies of water into useful electrical energy.
  • WEC wave energy converter
  • Known WEC systems generally include a “float” (or “shell”) and a “spar” (or “shaft” or “column” or “piston”) which are designed to move relative to each other to convert the force of the waves into mechanical energy.
  • the float is generally depicted or referred to as the moving member and the spar as the non-moving or mechanically grounded member. But, the opposite may be the case.
  • the spar and float may both move relative to each other.
  • a WEC generally includes a power-take-off device (PTO) coupled between the float (WEC shell) and the spar (shaft or column) to convert the mechanical power available from the WEC into electrical power.
  • the PTO device may be any device capable of converting the relative motion between the float and spar into electrical energy.
  • the PTO device may be a linear-to-rotary translator (e.g. rack and pinion gear assembly, a ball screw assembly, a hydraulic cylinder and motor assembly, or a pneumatic cylinder and motor assembly) coupled to a rotary electric generator.
  • the PTO device can also be a linear electric generator (LEG) that directly converts mechanical power to electric power using electromagnetic induction.
  • LEG linear electric generator
  • the PTO device is placed in the water and is coupled to the float and spar.
  • a mechanical linkage e.g. "pushrod” connected to one of the float and spar is attached to a PTO device located inside the other of the float and spar, with the pushrod passing through an air-tight seal.
  • a WEC with a "float” that is acted upon by the waves, a “reaction” mass that is totally contained within the float, and a spring and power take-off device that couple the reaction mass to the float.
  • the enclosed mass (m) is suspended from, or supported by, a spring that is connected to the float and whose force constant (k) is tuned to give the desired natural period (T n ) of the WEC.
  • a problem with this approach i.e., selecting the spring force characteristic to yield a desired natural period
  • the length of the spring is typically very large, and it is not practical to construct or house such a large spring within the float.
  • the length of the spring in still water (xo) can be determined by solving the two following equations simultaneously.
  • Equation 1 shows that the downward force of the reaction mass (m-g) is equal to the upward force of the spring (/ex) in static conditions.
  • Equation 2 shows that the mass (m) and spring force constant (k) can be selected to give the mass-spring oscillator a natural oscillating frequency near that of the predominant waves; where T n is equal to the period of the wave.
  • the length of the spring (x 0 ) would be approximately 4 meters. If the mass-spring system is tuned for an 8-second wave (T), the length of the spring (x 0 ) would be approximately 16 meters. Fabricating and locating such a large spring within a float presents many problems.
  • This invention relates to a wave energy converter (WEC) that includes a "float” which is exposed to the surface waves, an internal “oscillator” formed by a mass and a novel spring system, and a power take-off device which is coupled between the mass and the float.
  • WEC wave energy converter
  • a WEC system embodying the invention includes a "shell” ("float” or “hull”) containing an internal oscillator including a “reaction mass” and a spring system which includes an elastic spring (ES) and constant force spring (CFS).
  • a power take-off (PTO) device is coupled between the shell and the internal oscillator to convert their relative motion into electric energy.
  • the shell and internal oscillator are constructed such that, when placed in a body of water and in response to waves in the body of water, there is relative motion between the shell and the internal oscillator's mass, i.e., what is termed the reaction mass.
  • the spring system or mechanism includes a constant force spring connected between the oscillator's reaction mass and the shell and an elastic spring also connected between the reaction mass and the shell.
  • the constant force spring provides a force (Fc) which is nearly constant to counterbalance the static weight of the reaction mass.
  • the constant force spring can be any device which exerts a constant force over its range of motion. It does not obey Hooke's law.
  • An advantage of the invention is that the constant force spring may be used to control and reduce the extended "static" length of the elastic spring without reducing the ability of the elastic spring to provide a desired dynamic range of motion.
  • the elastic spring can be a physical spring, such as a coil spring, a leaf spring or a torsional spring.
  • the function of the elastic spring mechanism may be obtained by controlling the PTO so it behaves like a spring (i.e. back-force increases with displacement); or by a combination thereof.
  • the PTO device can be any one of a number of devices, including a linear electric generator (LEG), or a translator that converts linear motion and force to rotary motion and torque, coupled to an electric generator (e.g., a rotary generator).
  • LEG linear electric generator
  • a translator that converts linear motion and force to rotary motion and torque, coupled to an electric generator (e.g., a rotary generator).
  • the WEC may have a "positive" system buoyancy such that it floats on the surface of the water and responds to changes in buoyant force due to passing waves, or the WEC may have a "neutral” system buoyancy such that it remains disposed within the volume of the body of water and responds to changes in hydrodynamic pressure due to passing waves.
  • the reaction mass can be a water tank that is filled only after the WEC is deployed in the water. It should be appreciated that WEC buoy batteries (functioning to store the converted energy) can also be used as the reaction mass.
  • FIG. 2 shows several configurations of prior art WECs which include a float, a reaction mass, a PTO and a very long spring;
  • FIG 3 depicts a WEC embodying the invention in which an elastic spring and a constant force spring are used to attach a reaction mass to a shell;
  • Figure 4A is a simplified diagram of the operation of an elastic spring as per the prior art;
  • Figure 4B is a simplified diagram representing the operation of a "compound” spring in accordance with the invention.
  • FIG. 5 is a simplified block diagram of a WEC in which a constant force spring and upper and lower elastic springs are used to control the positioning and movement of a reaction mass;
  • FIG. 6 is a simplified block diagram of a WEC in which a constant force spring and an elastic springs are used to control the positioning and movement of a reaction mass which includes part of the power take device.
  • Equation 1 indicates that the downward force of the reaction mass (m g) is equal to the upward force of the spring (k x) in static conditions.
  • Equation 2 indicates that the mass (m) and spring force constant (k) can be selected to give the mass- spring oscillator a natural oscillating frequency near that of the predominant waves. If the two equations are solved simultaneously, the still-water extension spring length (x 0 ) of an elastic spring would be:
  • the extension length of the spring (x 0 ) would be approximately 4 meters. If the mass-spring system is tuned for an 8-second wave (T), the length of the spring (xo) would be approximately 16 meters.
  • drawings (A), (B) and (C) show different WEC configurations, each illustrating a WEC with a spring that is tuned to provide an oscillatory period of about 8 seconds.
  • the extension spring length under static conditions is quite long (e.g., 16 meters for an 8 second wave).
  • the extension spring length must be capable of being stretched further to provide a desired dynamic range. This requires that the shell (“envelope") of the WEC be made large to accommodate the extension and stroke of the spring.
  • a WEC embodying the invention includes: (a) a "float” ("shell” or “hull”)10 which is exposed to the surface waves; (b) an internal “oscillator” formed by a reaction mass 20 and the parallel combination 28 of an elastic spring 30 and a constant force spring 32; and (c) a power take-off device (PTO) 40 coupled between the mass 20 and float 10 to convert mechanical energy into electric energy.
  • the elastic spring 30 has two ends, one end is connected to the shell (“float") and the other end is connected to the reaction mass 20.
  • the constant force spring 32 has two ends, one end being connected to the shell and the other end being connected to the reaction mass.
  • the reaction mass 20 is shown suspended from the other (bottom) ends of the constant force and elastic springs.
  • the constant force spring 32 can be any device which exerts a constant force over its range of motion. That is, the connecting arm/wire of CFS 32 to the reaction mass can, and does, move up and down as the elastic spring 30 moves up and down, but CFS 32 only exerts a constant force Kc, at all times.
  • the shell and internal oscillator are constructed such that, when placed in a body of water and in response to waves in the body of water, there is relative motion between the shell 10 and the internal oscillator's mass 20. For example, the shell moves up and down in response to the up and down motion of the waves. Then, after a phase delay the mass 20 moves, correspondingly.
  • the relative motion of the float and mass/spring is converted by the PTO 40 into electrical energy.
  • the PTO device 40 can be any one of a number of suitable devices, including a linear electric generator (LEG), or a translator that converts linear motion and force to rotary motion and torque, coupled to a rotary electric generator.
  • LEG linear electric generator
  • the elastic spring 30 which connects the reaction mass 20 to the shell 10 can be a physical spring, such as a coil spring, a leaf spring or a torsional spring.
  • the function of spring 30 may be obtained by; (a) controlling the PTO so it behaves like a spring (i.e. back-force increases with displacement); and/or (b) by a combination of a physical and an equivalent device.
  • An important aspect of the present invention is the recognition that the static extension length of a conventional elastic spring can be reduced by using a constant force spring 32 in parallel with the elastic spring 30.
  • the constant force spring 32 is connected between the reaction mass 20 and the shell 10.
  • the force Fc of the constant force spring 32 can be selected to be equal to [(m)(g)] so that Xo of the elastic spring 30 is zero.
  • Fc can be selected to have any value equal to [z][(m)(g)]; where z is a fractional number between zero (0) and one (1 ).
  • the elastic spring 30 In the absence of the constant force spring 32, the elastic spring 30 would need to be extended as shown in Fig. 4A. That is, the spring 30 initially has a length Xn, (which may range from part of a meter to several meters) when attached at its upper end to the shell with no load attached to its other end. Then, when a reaction mass 20 is attached to its other end, with the spring-mass oscillator being tuned for optimum wave energy capture, the'spring 30, under static conditions would be extended a length Xo, whereby the total static length of the spring 30 in still water would be Xn +Xo, when measuring from a reference point such as the top of the shell or float.
  • Xn which may range from part of a meter to several meters
  • reaction mass moves up and down about a horizontal steady state base line extending a distance Xn +Xo from the reference point on the shell to which the spring is attached.
  • Figure 4A and Table 1 may be used to illustrate the operation of the prior art system using a single elastic coil/spring.
  • Table 1 is a tabulation of: (a) the "static" (still water) extension length x 0 of the elastic spring which would be required for a given ratio of k/m when connected to a selected reaction mass, in accordance with the prior art; (b) the extension length of the spring (x max ) when subjected to a further downward force; and (c) the extension length of the spring (Xmin) when subjected to an upward (compressive) force.
  • Table 1 tabulates the various extension lengths of an elastic spring for a conventional coil spring configuration; where (x 0 ) is the coil spring displacement/extension in still water when the spring constant, k es, is tuned for different predominant wave periods, T n (s); (x m j n ) is the minimum extension length, and (x ma ⁇ ) is the maximum extension length for a reaction mass with stroke (L) as a function of oscillator period (T n ). Note that, as shown in Fig. 4A, the spring has a "normal" (unloaded) length of Xn when there is no reaction mass attached to the spring. When the reaction mass is attached to the spring the spring is subjected to an additional static (still water) extension amount of length Xo.
  • the extension length Xo varies to take into account the values of the elastic spring constant k es to tune the spring-reaction mass oscillator for the predominant wave period.
  • Oscillations induced by the effects of the waves will cause the reaction mass to be moved dynamically: (a) by an amount Xup above XT (or Xo) in a direction to cause compression of the spring; and (b) by an amount Xdn below XT (or Xo) in a direction to cause further stretching of the spring.
  • the movement of the spring between Xmin and Xmax defines the dynamic range or stroke (L) of the spring.
  • Table 1 it is assumed that the swing up is symmetrical to the swing down, in response to the forces of the waves on the shell.
  • the constant force spring 32 can be used to eliminate (partially or totally) the "static" extension length Xo of an elastic spring due to the weight of the reaction mass 20.
  • the extension length Xo of the elastic spring 30 can then be selectively reduced or eliminated since the elastic spring can now be designed for a spring displacement (travel) to handle the dynamic change (stroke, L) due to the oscillations of the reaction mass (but not its static weight value).
  • the float (10), loosely anchored to the sea floor (11 ) via a mooring line 12, is allowed to move up and down with the waves.
  • the "reaction" mass (20) is contained inside the shell (10) and its vertical motion is guided by a set of low-friction rails or guides (13).
  • the total vertical motion of the reaction mass is limited by a set of end-stops (lower stops 15 and upper stops 17) that can be sets of springs or dampers (15, 17) or a combination thereof.
  • the reaction mass (20) is connected to the shell 10 via assembly 28 comprising elastic "oscillator” spring (30) and constant force spring 32.
  • Figure 3 illustrates that, in accordance with the invention, the elastic a constant force spring 32 is placed in parallel with an elastic spring 30.
  • the constant force spring, 32 sometimes called a "counterbalance spring,” exerts a relatively constant force (F c ) on the reaction mass.
  • F c relatively constant force
  • Fe s - K c relatively constant force
  • K 0 nearly constant
  • the elastic spring 30 exerts a force (F es ) on the reaction mass that is proportional to the displacement, x, according to Hooke's law.
  • F es K e x, where K e is essentially constant.
  • the reaction mass (20) is guided vertically by guide rails (13) to keep the reaction mass (20) from spinning as it goes up and down.
  • the reaction mass (20) is connected to constant force spring, 32, and to elastic spring (30), both of which are connected at their other ends to the shell.
  • the reaction mass (20) is also connected to a power take-off device 40 that converts the relative motion and force between the shell and reaction mass into mechanical or electrical power.
  • a ball screw coupled to a rotary electric generator is one such device.
  • An electric generator is connected to the translator.
  • the translator rotates clockwise and counterclockwise, and electric power is generated.
  • the force constant, K c , of CFS 32 is selected so that it is equal to, or approximately equal to, the gravitational force acting on the reaction mass.
  • the gravitational force is equal to [(m)(g)]; where m is the mass of the reaction mass 20 and g is the gravitational acceleration constant.
  • the elastic spring's force constant is selected so as to give the mass-on-spring oscillator WEC (MOSWEC) system a natural period near the predominant wave period (reference Equation
  • the length of the spring in still water (xo) is defined by the following equations.
  • equation 5 indicates that the mass (m) and spring force constant (K e ) can be selected to give the mass-spring oscillator a natural oscillating frequency near that of the predominant waves.
  • Figure 4B and Table 2 may be used to illustrate the operation of the system of Fig. 3 which embodies the invention.
  • Table 2 tabulates various lengths of an elastic spring 30 when used in parallel with a constant force spring configuration.
  • (Xmin) is the elastic spring's minimum length,
  • (Xma x ) is the elastic spring's maximum length for a given reaction mass with a dynamic stroke (L) as a function of oscillator period (T n ) when the elastic spring constant k eS is tuned for the predominant wave periods.
  • the constant force spring 32 may be selected such that the extension of the elastic spring 30 in still water is equal to Xn+C1 , where Xn is the normal extension of the unloaded elastic spring 30 and C1 is a constant value which may be selected to have a value between zero and the value of Xo obtained from Equation 3.
  • the length, Xmax, of the elastic spring when fully extended (at the bottom of the stroke) may then be expressed as Xn+C1 +L/2 and the length, Xmin, of the elastic spring when fully retracted (at the top of the stroke) may then be expressed as Xn+C1-; assuming equal up and down strokes.
  • the CFS 32 can be selected such that, for an 8 second wave C1 of the elastic spring can be set to zero or to any length between zero and 16 meters, That is, a constant force spring 32 can be selected to control the "static" extended length Xsw of the elastic spring , in still water, when a reaction mass is attached to the constant force spring and the elastic spring.
  • the dynamic range of the elastic spring has not been significantly altered such that the spring and reaction mass can still be moved up (compressed) by an amount Xup or stretched further down by an amount Xdn in a direction to cause further extension of the spring.
  • the movement of the spring between the top of Xup and the bottom of Xdn defines the dynamic range or stroke (L) of the spring.
  • the dynamic range defines the power obtainable from the system.
  • Figure 5 shows that an elastic spring 3OA may be connected between the reaction mass 20 and the top of the shell and an elastic spring 30b may be connected between the reaction mass 20 and the bottom of the shell. Note that a single CFS 32 is used and the PTO 40 is shown connected between the reaction mass and the bottom of shell 10. Except for the lower spring, Fig. 5 is similar to Fig. 3 and need not be further detailed.
  • reaction mass has been shown in block form. However, Applicant recognized that it is preferable to have a reaction mass which tends to be shaped like a "fat" pancake rather than an elongated cylinder. It should be noted that the power generated and/or available from a mass-on-spring WEC (MOSWEC) is a linear function of weight over a wide range of weigh. It is therefore desirable to have much weight (reaction mass) as possible. However it is also evident that the weight can not be greater than a value which would cause the WEC to sink and/or which would interfere with the proper response of the WEC. Applciant also recognized that the available power from a MOSWEC is a function of the length of the stroke L. However, the cost of manufacture increases exponentially as the stroke and the size of the WEC increases. Thus, there is a need to define an optimum design taking many of these different factors into consideration.
  • Figure 6 shows another embodiment of the invention in which the reaction mass is supported by both a constant force spring 32 and an elastic spring 30.
  • the two types of springs are either attached directly to the buoy shell or indirectly to the shell via support brackets.
  • the reaction mass contains the "Stator” portion of a linear electric generator (LEG) that houses the generator coils.
  • LEG linear electric generator
  • the reaction mass slides up and down a magnet rod comprised of many magnets.
  • Voltage(s) is/are induced in the Stator Coils as the reaction mass slides up and down the magnet rod.
  • Electrical energy (power) is then transferred from the moving stator to the buoy electrical equipment (ELEC) via a flexible cable, sliding electrical contacts, or through the guide rails, which must then be electrically isolated from each other and the structure.
  • PTO power take-off device

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  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Abstract

L'invention concerne un système convertisseur d’énergie houlomotrice (WEC) comprenant une coque contenant un oscillateur interne constitué d’une masse de réaction suspendue à la coque par un ressort élastique en parallèle avec un ressort à force constante. Ledit ressort à force constante exerce une force (Fc) relativement constante afin de contrebalancer le poids statique de la masse de réaction et de réduire la longueur « statique » d’allongement du ressort élastique tandis que ledit ressort élastique exerce sur la masse de réaction une force (Fes) proportionnelle à la déformation x du ressort élastique. Un dispositif de prise de force (PTO), situé à l’intérieur de la coque et couplé entre la coque et l’oscillateur interne, convertit leur mouvement relatif en énergie électrique.
PCT/US2008/012092 2008-10-24 2008-10-24 Convertisseur d’énergie houlomotrice avec oscillateur interne masse-ressort Ceased WO2010047677A1 (fr)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8067849B2 (en) * 2005-12-01 2011-11-29 Ocean Power Technologies, Inc. Wave energy converter with internal mass on spring oscillator
EP2657511A1 (fr) 2012-04-24 2013-10-30 Nederlandse Organisatie voor toegepast -natuurwetenschappelijk onderzoek TNO Convertisseur d'énergie des vagues de l'eau
WO2016195600A1 (fr) * 2015-06-05 2016-12-08 Nanyang Technological University Convertisseur d'énergie des vagues
EP2546509A3 (fr) * 2011-07-12 2018-01-10 Body for Gyeongju Univ. Education & Industry Cooperation Générateur d'électricité activé par les vagues

Citations (3)

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Publication number Priority date Publication date Assignee Title
US6229225B1 (en) * 1997-05-08 2001-05-08 Ocean Power Technologies, Inc. Surface wave energy capture system
US20070068153A1 (en) * 2003-01-22 2007-03-29 Gerber James S Tunable wave energy converter
US20070126239A1 (en) * 2005-12-01 2007-06-07 Stewart David B Wave energy converter utilizing internal reaction mass and spring

Patent Citations (3)

* Cited by examiner, † Cited by third party
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US6229225B1 (en) * 1997-05-08 2001-05-08 Ocean Power Technologies, Inc. Surface wave energy capture system
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US8067849B2 (en) * 2005-12-01 2011-11-29 Ocean Power Technologies, Inc. Wave energy converter with internal mass on spring oscillator
EP2546509A3 (fr) * 2011-07-12 2018-01-10 Body for Gyeongju Univ. Education & Industry Cooperation Générateur d'électricité activé par les vagues
EP2657511A1 (fr) 2012-04-24 2013-10-30 Nederlandse Organisatie voor toegepast -natuurwetenschappelijk onderzoek TNO Convertisseur d'énergie des vagues de l'eau
WO2016195600A1 (fr) * 2015-06-05 2016-12-08 Nanyang Technological University Convertisseur d'énergie des vagues

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