Wave propulsion system

Abstract

A wave propulsion system (100) comprising a flap and configured to be installed at the rear of a boat, the wave propulsion system being able to place the flap in a working configuration, where the flap is submerged in water, or in a raised configuration, where the flap is out of the water, the wave propulsion system comprising a base (110) mounted at the rear of the boat (103) and connected to a yoke (115) arranged to place the flap in the working configuration or the raised configuration, an articulated assembly (120) connecting the flap (105) to the yoke (110), the articulated assembly being arranged to allow oscillation of the flap under the action of the movements of the boat caused by the movements of the waves when the flap is placed in the working configuration, a lifting actuation means (260) making it possible to switch from the working configuration to the raised configuration. Abstract figure: Figure 2a

Description

Title of the invention: Wave propulsion system Technical field

[0001] The present invention relates to the field of propulsion, and more particularly to a wave propulsion system using wave energy to propel a boat. Prior art

[0002] The swell, a wave phenomenon generated mainly by the wind, forming on the surface of the water in the seas and oceans is capable of providing so-called renewable energy. The energy generated by converting this renewable energy can be mechanical, hydraulic, or even electrical energy. In the case of conversion into mechanical energy, the mechanical energy generated can be used to propel a boat for example.

[0003] The capture and conversion of this renewable energy can be achieved in different ways, for example via a wave energy system. The majority of current wave energy systems are based on the same principle which consists of moving a mobile element according to the movement of the waves relative to a fixed element. This movement of a first element relative to a second is then converted into usable energy.

[0004] The main current obstacles to the commercial development of wave energy systems, such as wave energy propulsion systems, are a lack of maturity and / or efficiency, and / or high manufacturing and maintenance costs. Indeed, the difficult environmental conditions to which they are subjected coupled with moderate efficiency make the cost of energy production (electrical or mechanical) uncompetitive compared to other energies, such as fossil fuels or other renewable energies such as solar or wind, the technologies of which are now mature with a manufacturing cost that continues to fall. In addition, a wave energy system designed to propel a boat and / or produce energy from a boat must generally be designed and integrated from the design stage of the boat, involving significant costs and constraints.Furthermore, existing wave energy systems are generally not designed to be disengaged when weather conditions are not conducive to its operation or during delicate maneuvers, such as towing the vessel, as defined in the SOLAS standard, or docking at a quay.

[0005] Therefore, there remains a double need, a need to propose a solution with a high efficiency / cost ratio capable of efficiently converting renewable energy generated by the movement of waves for boat propulsion and / or electrical energy generation, and a need to offer a solution that can be installed on many types of boats, and which, after installation, meets maritime safety requirements. Summary

[0006] The present disclosure improves the situation.

[0007] There is provided a wave propulsion system configured to be installed on a boat, said system comprising a flap, said wave propulsion system being able to place the flap in a working configuration, where the flap is submerged in water, or in a raised configuration, where the flap is out of the water, the wave propulsion system being able to comprise: - a base mounted at the rear of the boat, the base being connected to a yoke movable relative to the base, the yoke being arranged so as to place the flap in the working configuration or the raised configuration, - an articulated assembly connecting the flap to said yoke, the articulated assembly being arranged so as to allow oscillation of the flap under the action of the movements of the boat caused by the movements of the waves when said flap is in the working configuration, - a lifting actuation means allowing switching from the working configuration to the raised configuration.

[0008] Advantageously, thanks to these provisions, the propulsion generated by the wave propulsion system, when the flap is placed in the working configuration, can lead to a reduction in the stress on the other means of propulsion of the boat (e.g. cargo ship or passenger ship). For example, when the boat is equipped with a propeller engine as the primary means of propulsion, the use of the wave propulsion system mounted at the stern of the boat can, advantageously, reduce fuel consumption. According to another additional advantage, the wave propulsion system, when it is additionally coupled to a generator (e.g. electric), via an energy conversion chain for example, can provide electrical energy to the boat.Furthermore, advantageously, when the flap is placed in the raised configuration, it is then possible to clear the space located at the rear of the boat (at the stern of the boat) to facilitate various operations, such as emergency or non-emergency towing of the vessel such as an LNG carrier, or to enable the wave propulsion system to be disengaged when the conditions are not optimal for its operation, such as the absence of swell or excessively strong swell, avoiding any risk of damaging the wave propulsion system or damaging the vessel, or to enable safe docking.

[0009] By shutter, it can also be understood foil or hydrofoil.

[0010] By switching from the working configuration to the raised configuration, it can be understood that the shutter switches from the working configuration to the raised configuration, and vice versa.

[0011] By movement of the boat, it can be understood pitching and / or heaving movements generated by the movement of the waves (i.e. by the swell). The pitching and / or heaving energy of the boat is converted into propulsion energy via the wave propulsion system making it possible to generate the oscillation of the flap.

[0012] To a lesser extent or in addition, the energy of the swell via the movement of the waves can also be transmitted directly to the propulsion flap, adding to the movements generated by the boat and thus reinforcing the oscillation of the flap.

[0013] In one or more embodiments, the yoke may be rotatably mounted on the base between a low position and a high position.

[0014] The high position of the yoke allows the shutter to be placed in the raised configuration, and the low position of the yoke allows the shutter to be placed in the working configuration.

[0015] In one or more embodiments, the boat may comprise a longitudinal direction X and in which the base comprises a first bearing and a second bearing, the first and second bearings being arranged on either side of a median plane (XM), the yoke being connected (A1; A1') to the first and second bearings by respective journals.

[0016] In one or more embodiments, the angle of rotation between the low position and the high position of the yoke around the axis of the journals (A1, A1') may be greater than 70 degrees, preferably greater than 105 degrees, and even more preferably greater than 120 degrees.

[0017] In one or more embodiments, the articulated assembly may comprise at least a first arm and a second arm connected to the yoke and to at least one flap arm by respective pivot connections (A2, A2', A3, A3'), said first arm and said second arm being arranged to cross and pivot relative to each other in a plane perpendicular to the flap and along the longitudinal direction of the boat X, said flap arm being connected to the flap by at least one pivot connection (A4) with the flap.

[0018] In one or more embodiments, the articulated assembly may comprise at least a first set of active and / or passive motion control elements and at least a second set of active and / or passive motion control elements configured to respectively control the pivoting of the first arm and the second arm, said first set of motion control elements being arranged between the yoke and the first arm, and said second set of motion control elements being arranged between the yoke and the second arm.

[0019] Thus, advantageously, the use of a set of passive and / or active motion control elements between the arms of the articulated assembly makes it possible to reinforce the propulsion efficiency of the wave energy system, for example by causing a form of mechanical resonance to appear in the movement of the flap. This mechanical resonance in the movement of the flap may be dependent on the configuration of the sets of motion control elements and / or the configuration of each motion control element.

[0020] By active, it can be understood that the motion control elements of a set of active motion control elements can be controlled by a control unit so as to adapt the characteristics of the motion control elements to external conditions, such as for example in relation to the swell encountered, or to the different phases of movement of the propulsion flap and / or the first and second arms. This control requires a power supply, electrical and / or hydraulic.

[0021] Thus, advantageously, when the sets of motion control elements are active, it is possible to adapt their characteristics. By their characteristics, it can be understood, for each motion control element, their respective stiffness, their respective inertia, and their respective damping. The respective damping of each active motion control element can be positive if the movement is slowed, or negative if energy is injected to increase the oscillation of the shutter.

[0022] In one or more embodiments, the first set of motion control elements and / or the second set of motion control elements may be passive, each set of motion control elements may respectively comprise a first return spring and a second return spring.

[0023] When the first set of motion control elements and / or the second set of motion control elements are passive, the mechanical resonance in the movement of the shutter may be dependent on the stiffness of the return springs.

[0024] In one or more embodiments, the first set of motion control elements and / or the second set of motion control elements are active, each set of motion control elements may respectively comprise a first cylinder and a second cylinder.

[0025] The first cylinder and the second cylinder may be linear cylinders.

[0026] In one or more embodiments, the first set of elements of motion control and / or the second set of motion control elements are active, each set of motion control elements may respectively comprise a first screw-nut system and a second screw-nut system.

[0027] In one or more embodiments, the base may include a guide member for guiding a towing cable.

[0028] Preferably, the towing cable is used when the shutter is placed in the raised configuration.

[0029] In one or more embodiments, the guide element may be formed as a through opening, and when the shutter is placed in the raised configuration, a space is released and which is defined by an opening cone extending from said opening, said opening cone being defined by an opening angle of at least 180 degrees in a plane perpendicular to the median plane XM, and at least 30 degrees in the median plane XM, preferably at least 60 degrees in the median plane XM.

[0030] The guide element may be an orifice included in a fairlead meeting the constraints defined in the SOLAS standard for the towing of very large vessels such as LNG carriers. The fairlead may be defined by a minimum diameter of 600 millimeters and a minimum height of 300 millimeters.

[0031] In one or more embodiments, the lifting actuating means may be at least one hydraulic cylinder or at least one electric cylinder or at least one screw-nut system.

[0032] In one or more embodiments, the wave propulsion system may include at least one locking device for locking the flap in the working configuration or the raised configuration.

[0033] In one or more embodiments, the flap may have a rectangular or triangular or trapezoidal or ellipsoidal shape in the XY plane, and a symmetrical NACA profile type shape in the XM plane.

[0034] In one or more embodiments, the shutter arm may comprise at least one means for actively adjusting an angle between the shutter and the shutter arm along a plane perpendicular to the shutter and along the transverse direction of the shutter.

[0035] The present disclosure also relates to an assembly comprising a system according to the present disclosure and a boat, the system being mounted at the rear of the boat, preferably at the stern of the boat.

[0036] In one or more embodiments, the vessel may be a cargo vessel or a passenger vessel.

[0037] By cargo ship, we can mean a container ship (comprising processed goods), a bulk carrier (comprising ores, cereals, rubble, sand, etc.), or a chemical tanker or a gas tanker or an oil tanker or a methane tanker or a roll-on / roll-off ship. Brief description of the drawings

[0038] Other characteristics, details and advantages will appear on reading the detailed description below, and on analyzing the attached drawings, in which: Fig.l

[0039] [Fig.l] illustrates a wave propulsion system mounted on a vessel such as a cargo ship. Fig. 2a

[0040] [Fig.2a] illustrates a perspective view of the propulsion system with a rotatably mounted yoke. Fig. 2b

[0041] [Fig.2b] illustrates a top view (XY plane) of [Fig.2a]. Fig. 2C

[0042] [Fig.2c] illustrates a sectional and perspective view of [Fig.2a] along the section plane A-A'. Fig. 3

[0043] [Fig.3] illustrates a sectional view B-B' and side view of the wave propulsion system of [Fig.2a] placed in the raised configuration. Fig. 4

[0044] [Fig.4] illustrates the kinematics of the propulsion flap under the action of the pitching of the ship and the waves in working configuration. Fig. 5

[0045] [Fig.5] illustrates the wave propulsion system mounted in translation on a boat. Description of the embodiments

[0046] In the various figures, the same references designate identical or similar elements. For reasons of clarity of the description, certain elements may not be shown to scale.

[0047] [Fig.l] shows a wave energy propulsion system mounted on a vessel such as a cargo ship.

[0048] The wave propulsion system 100 can be mounted at the rear of the boat, for example at the stern of the boat. In the example of [Fig.l], the wave propulsion system can be in the working configuration, that is to say corresponding to the partial or total immersion of the flap 105 in the water.

[0049] The vessel 103 may be a ship such as a cargo ship or a passenger ship and comprise a longitudinal direction X and a transverse direction Y. The cargo ships may be, for example, a container ship (comprising goods processed), a bulk carrier (comprising ores, cereals, rubble, sand, etc.), or a chemical tanker, or an LNG or oil tanker.

[0050] Passenger ships may be, for example, ferries or cruise ships.

[0051] As described in [Fig. 1], when the wave propulsion system is in the working configuration, the propulsion flap may be partially or totally submerged, preferably totally submerged, so as to allow propulsion of the boat via the oscillation of the flap generated by the movements of the boat, themselves generated by the swell, thus limiting the use of its electric motor or its combustion engine for example. The movements of the boat generated by the swell may be pitching and / or heaving movements of the boat, the pitching and / or heaving energy being transmitted to the flap so as to cause its oscillation via the articulated assembly and therefore the propulsion of the boat.

[0052] Furthermore, to a lesser extent, wave energy can also be directly transmitted to the flap, thereby enhancing its oscillation.

[0053] In one or more embodiments, the converted energy can also be used, partially or totally, to generate electrical energy via a conversion chain connected to a converter (e.g. electric generator, not shown), the conversion chain being connected to the wave propulsion system 100, for example connected to the articulated assembly.

[0054] The wave propulsion system may comprise a base 110 fixed to the rear of the boat, e.g. to the stern of the boat, and connected to a yoke 115, as well as an articulated assembly 120 making it possible to connect the yoke 115 to the propulsion flap 105.

[0055] The articulated assembly may be arranged so as to allow oscillation of the propulsion flap (or flap) under the action of the movements of the boat generated by the swell (i.e. by the movements of the waves), when the flap is placed in the working configuration and thus generate propulsion of the boat. The yoke may be arranged so as to place the propulsion flap in the working configuration or the raised configuration. More precisely, the movement of the yoke, between a low position and a high position of the yoke, makes it possible to cause the movement of the articulated assembly which in turn drives the propulsion flap in order to place it from the working configuration to the raised configuration, and vice versa (from the high position to the low position).

[0056] For this purpose, the yoke can be mounted for rotation or translation on the base between the low position and the high position.

[0057] Figures 2a to 2c illustrate the wave propulsion system arranged in the working configuration and comprising a rotatably mounted yoke.

[0058] More specifically, [Fig.2a] illustrates a perspective view of the wave propulsion system with a rotatably mounted yoke, [Fig.2b] illustrates a top view (XY plane) of [Fig.2a], and [Fig.2c] illustrates a sectional and perspective view of [Fig.2a] along a sectional plane A-A'.

[0059] The base may comprise a first bearing 210a and a second 210b, the first and second bearings being arranged on either side of a median plane (XM), and the yoke may be connected A1; A1' to the first and second bearings by respective journals.

[0060] By way of example, the first bearing 210a and the second bearing 210b may be respectively defined in a first projection and a second projection located respectively at a first end and a second end of the base, the projections being arranged to be in opposition. The yoke (eg in the form of a U) may comprise a first and a second journal connected Al;A1' respectively to the first and second projection via the first and second plate.

[0061] Further, the base may include a guide member 210c configured to guide a towing cable when the flap is placed in the raised and / or lowered configuration. For example, the guide member may be formed as a through opening. For example, the guide member 210c may be a through opening in a third projection included in the base 110 so as to form a fairlead. The through opening may have a diameter greater than 600 millimeters and the fairlead may have a height of at least 300 millimeters and have structural characteristics making it possible to meet the constraints defined in the SOLAS standard relating to emergency towing.

[0062] The shutter may be connected to the articulated assembly via a shutter arm 230a.

[0063] For example, the flap arm 230a may be connected to the yoke via at least a first arm 220a and a second arm 220b connected to the yoke 115 and to the flap arm 230a by respective pivot connections A2, A3, A2', A3'. The first arm and the second arm may be arranged to cross and pivot relative to each other in a plane perpendicular to the flap, for example a plane XM, and in the longitudinal direction of the boat Y.

[0064] With reference to [Fig.2b], the shutter arm may further be connected to the shutter by at least one respective connection A4.

[0065] In one or more preferred embodiments, the articulated assembly may comprise first and second arms connected respectively to one or a plurality of shutter arms and to the yoke, and which are arranged symmetrically with respect to the median plane (XM).

[0066] For example, one or a plurality of shutter arms 230a, 230b may be connected to the yoke by at least two first arms 220a, 220c connected respectively, to the yoke 115 and to the arm or plurality of shutter arms 230a, 230b by pivot connections A2, A2', and can be connected to the yoke by at least two second arms 220b, 220d connected respectively to the yoke and to the arm or plurality of shutter arms 230a, 230b by pivot connections A3, A3'.

[0067] The shutter may be connected to one or a plurality of shutter arms by respective pivot links A4, A4'.

[0068] In one or more embodiments, the first arms or the second arms, or the shutter arms may constitute a single respective part in the shape of an inverted U or not. For example, the first arms 220a, 220c may be comprised in an inverted U-shaped part.

[0069] Furthermore, with reference to [Fig.2c], the articulated assembly 120 may comprise at least a first set of motion control elements 240a, 240b and a second set 245a, 245b of motion control elements respectively configured to control (or drive) the pivoting of the first and second arms. The first set of motion control elements may be arranged between the yoke 115 and the first arm 220a, and the second set of motion control elements may be arranged between the yoke 115 and the second arm 220b.

[0070] Further, each set of motion control elements may be a set of active and / or passive motion control elements.

[0071] In one or more embodiments, when the first set of motion control elements and / or the second set of motion control elements are passive, each set of motion control elements respectively comprises a first return spring 240a, 245a and a second return spring 240b, 245b.

[0072] As an example ([Fig.2c]), the first set 240a, 240b of motion control elements may comprise a first return spring (e.g. compression or extension) 240a connected to the yoke 115 and to the first arm 220a by respective pivot links, and a second return spring 240b (e.g. compression or extension) connected to the yoke 115 and to the first arm 220a by respective pivot links. Similarly, the second set 245a, 245b of motion control elements may comprise a first return spring (e.g. compression or extension) 245a connected to the yoke 115 and to the second arm 220b by respective pivot links, and a second return spring 245b (e.g. compression or extension) connected to the yoke 115 and to the second arm 220b by respective pivot links.

[0073] In one or more embodiments, the first set of motion control elements and / or the second set of motion control elements are active, each set of motion control elements respectively comprises a first cylinder (eg linear cylinder) 240a, 245a and a second cylinder (eg linear cylinder) 240b, 245b.

[0074] Each cylinder of the sets of motion control elements can be connected to a respective motor controlled by a control unit so as to adapt the characteristics (e.g. stiffness, damping, inertia) of each cylinder in relation to the external conditions or in relation to the movement phases of each arm or in relation to the movement of the boat, and thus optimize the propulsion force of the flap during propulsion. The external conditions can be, for example, the type of swell encountered.

[0075] The control unit can be arranged on the wave energy system or arranged directly on the boat for example.

[0076] Further, when the articulated assembly comprises first and second arms, the articulated assembly may comprise first and second sets of motion control elements arranged symmetrically with respect to the median plane XM.

[0077] In order to maintain the wave propulsion system in the working configuration or the raised configuration, it may comprise at least one locking device (not shown in FIGS. 2a to 2c) for locking the position of the flap in one or other of the configurations. For example, the locking device may be included between the yoke and the base.

[0078] In one or more embodiments, the locking device is mounted on the yoke so as to be integral with its movement.

[0079] According to one example, the locking device may be a rack and pinion system coupled to a key (or locking shaft / bar) locking a locking position 280a or 280b respectively locking the yoke in a low position so that the shutter is placed in a working configuration, and in a high position so that the shutter is placed in a raised configuration. For example, each locking position may be formed by two collinear openings, the first opening being arranged on the base and the second opening being arranged on the yoke. When the yoke moves from the low position to the high position, the two openings of the high position are aligned so as to allow the insertion of the key by the locking device.

[0080] When the flap is placed in the working configuration via the yoke placed in the low position, the locking device makes it possible to prevent rotation of the yoke and thus guarantees good transmission of the propulsion force and other hydrodynamic forces applied to the flap (and / or good propulsion efficiency) via the connection Al, Al' and the inserted key (not shown) in the locking position forming the low position.

[0081] In one or more embodiments, the wave propulsion system may comprise at least two locking devices and first and second locking positions arranged symmetrically on either side of the XM plane.

[0082] In one or more embodiments, the wave propulsion system may comprise at least three locking positions on a single side of the XM plane, or on either side of the XM plane. Such arrangements make it possible to place the wave propulsion system in one or more intermediate positions between the working configuration (i.e. low position of the yoke) and the raised configuration (i.e. high position of the yoke).

[0083] With reference to [Fig.2b] or [Fig.3], the wave propulsion system may comprise a lifting actuation means or a plurality of lifting actuation means 260 configured to place the propulsion flap in the working configuration or the raised configuration.

[0084] The lifting actuating means may be arranged between the base and the yoke via respective pivot connections. For example, the lifting actuating means may be a hydraulic cylinder such as a double-acting linear cylinder or a screw-nut system.

[0085] In one or more embodiments, the plurality of lifting actuating means is a plurality of hydraulic cylinders (or a plurality of screw-nut systems) comprising at least two hydraulic cylinders (or at least two screw-nut systems). Preferably, the plurality of hydraulic cylinders (or a plurality of screw-nut systems) of the lifting actuating means 260 comprises at least four hydraulic cylinders (at least four screw-nut systems).

[0086] For example ([Fig.2b] or [Fig.3]), the cylinders of the plurality of hydraulic cylinders 260 can be connected to the base by a respective pivot connection A6, and the rod of each hydraulic cylinder allowing the force to be transmitted (e.g. by pushing) to cause the movement of the articulated assembly and the flap can be connected to the yoke by a respective connection A7, see [Fig.3] or [Fig.2b]. When actuating the cylinders to move from the working configuration to the raised configuration (after unlocking the locking position by the locking device), or vice versa, the force transmitted by the cylinder rods to the yoke allows it to rotate around the base along the connections A1, A1' formed by the plates and the trunnions so that the yoke moves from the low position to the high position, carrying with it the articulated assembly and the propulsion flap (or flap), see [Fig.3].

[0087] The flap may be a thin structure extending primarily in two directions, a longitudinal x-direction and a transverse y-direction, with a thin thickness in the third direction (Z-direction). The thickness of the flap may vary between the leading edge and the trailing edge in the manner of an aerodynamic spoiler.

[0088] The flap may have a rectangular, triangular, trapezoidal, or ellipsoidal shape. For example, the shape of the flap may be similar to the tails of marine mammals, such as dolphins or whales, for example. The flap may have dimensions where the length along the Y axis is greater than the width along the X axis. The thickness of the flap is defined so as to be consistent with the other quantities, particularly from the point of view of resistance to forward movement (this is to minimize drag).

[0089] The dimensions of the propulsion flap must be adapted to the dimensions of the wave propulsion system, itself adapted to the environmental conditions and constraints of the boat. For example, the dimensions of the flap can be in a range of 4 to 46 meters for the lengths (length generally not exceeding the width of the vessel), 2 to 13 meters for the widths, and for a maximum thickness (or height) of up to 200 centimeters. More precisely, the dimensions are 30 meters for the length located at the end of the flap, 8.75 meters for the width, and 130 centimeters for the maximum height (or thickness).

[0090] According to one embodiment, the flap can be made of steel or composite materials (such as fiberglass or carbon fiber plastic) or a combination of the two. The production of composite materials can make it possible to configure the propulsion flap with a certain flexibility, in particular by controlling the arrangement of the fibers along the chord. This flexibility optimizes the propulsive aspect, like a flipper. In addition, the use of composite materials to produce the flap also makes it possible to lighten the system.

[0091] According to one embodiment, the flap may have an aircraft wing profile or a symmetrical NACA type profile.

[0092] [Fig.3] shows a sectional view B-B' and side view of the wave propulsion system of [Fig.2a] placed in the raised configuration.

[0093] The flap 105 can be completely removed from the water via the lifting actuation means 260 allowing the rotation of the yoke (and therefore of the articulated assembly) around the pivot connection Al, Al' with the base allowing it to move from the low position to the high position.

[0094] In this raised configuration, the rear of the boat can be completely (or partially) freed, allowing various operations to be carried out such as towing (e.g. emergency towing) of the vessel or docking at a quay. Indeed, the dimensions of the wave propulsion system, generally adapted to the dimensions of the vessel, can be significant in view of the restricted space in a port or near a mooring quay.

[0095] Furthermore, disengaging the wave propulsion system from the water ensures the integrity of the wave propulsion system or the boat when environmental conditions are not conducive to its use, or even guarantees safe docking of the vessel without structural damage.

[0096] Disengagement can also free up space in the event of the boat being towed by another boat.

[0097] For this purpose, the third projection comprising the through opening 210c can be crossed by a towing cable 340. The placement of the flap in the raised configuration can make it possible to free up a space defined by an opening cone starting from the opening and having an opening angle 360 ​​of at least 180 degrees in a plane perpendicular to the median plane XM, and of at least 30 degrees in the median plane XM, preferably 60 degrees in the plane XM. This opening cone can be defined according to the SOLAS standard aimed at towing high-tonnage ships such as LNG carriers for example.

[0098] This third projection comprising a through opening can be used to pass a towing cable for towing the boat / ship whether in working configuration or in raised configuration. Preferably, towing and use of the towing cable with the third projection are carried out in raised configuration.

[0099] In [Fig.3], the deployment of the rods of the hydraulic cylinders 260 is also illustrated when the yoke has moved from a low position to a high position.

[0100] Furthermore, when the shutter is placed in the raised configuration, the locking device can make it possible to release the stress exerted on the lifting actuation means 260 (e.g. hydraulic cylinders or irreversible screw-nut system), and to prevent any fall of the shutter and the articulated assembly in the event of failure of the lifting actuation means.

[0101] Advantageously, when the lifting actuation means 260 are one or a plurality of irreversible screw-nut systems, the prevention against any fall of the shutter and of the articulated assembly in the event of failure of the lifting actuation means is significantly improved via the irreversibility of the irreversible screw-nut system.

[0102] In one or more embodiments, the angle of rotation between the low position and the high position of the yoke around the axis of the journals (A1, A1') is greater than 70 degrees, preferably greater than 105 degrees, and even more preferably greater than 120 degrees.

[0103] [Fig.4] illustrates the kinematics of the propulsion flap under the action of the pitching of the ship and the waves in working configuration.

[0104] During the rotary movement, generated by the movement of the waves, of the arm(s) of flap (and therefore the propulsion flap) around the pivot links A2, A3, A2', A3', the flap arm(s) and the propulsion flap can be returned to their original position via the set(s) of motion control elements causing an oscillating movement of the flap conducive to propulsion of the ship.

[0105] The flap arm may comprise at least one adjustment means 410 for adjusting the angle between the flap and the flap arm in a perpendicular plane and along the transverse direction of the flap (or in the plane XM). For example, the adjustment means may be one or more hydraulic cylinders (e.g. linear cylinder) each cylinder of which is in pivot connection A8 with the flap arm, and the rod of each cylinder is in pivot connection A9 with the flap. Thus, it is possible to actively adjust the angle between the flap and the flap arm(s) during wave phenomena, making it possible to optimize the propulsive effect of the wave-powered system. Injecting energy into this flap / horizontal arm connection also makes it possible to more clearly reveal a resonance in the oscillation of the mechanical system and therefore a propulsive performance peak.

[0106] [Fig.5] illustrates the wave propulsion system mounted in translation on a boat.

[0107] In this embodiment, the yoke 115 can be mounted in translation on the base 110 fixed to the boat 103.

[0108] The articulated assembly and the propulsion principle remain the same as in the embodiments presented previously, except that the shutter can be placed in the working configuration or the raised configuration by a translational movement along the Z direction or following an inclined ramp.

[0109] In this embodiment, the locking device can be placed along the base at different levels to secure the hinged assembly at different heights corresponding to different heights of the propulsion flap.

Claims

Claims

1. A wave propulsion system (100) configured to be installed on a boat, said system comprising a flap (105), said wave propulsion system being able to place the flap in a working configuration, where the flap is submerged in water, or in a raised configuration, where the flap is out of the water, the wave propulsion system comprising: - a base (110) mounted at the rear of the boat (103), the base being connected to a yoke (115) movable relative to the base, the yoke being arranged so as to place the flap in the working configuration or the raised configuration, - an articulated assembly (120) connecting the flap (105) to said yoke (110), the articulated assembly being arranged so as to allow oscillation of the flap under the action of the movements of the boat caused by the movements of the waves when said flap is in the working configuration,- a lifting actuating means (260) for switching from the working configuration to the raised configuration, in which the yoke is rotatably mounted on the base between a low position and a high position.,

2. System according to the preceding claim, in which the boat comprises a longitudinal direction X and in which the base comprises a first bearing (210a) and a second bearing (210b), the first and second bearings being arranged on either side of a median plane (XM), the yoke being (115) connected (A1; A1') to the first and second bearings by respective journals.

3. System according to the preceding claim, in which the angle of rotation between the low position and the high position of the yoke around the axis of the journals (Al,Al') is greater than 70 degrees, preferably greater than 105 degrees, and even more preferably greater than 120 degrees.

4. System according to one of the preceding claims in which the articulated assembly comprises at least a first arm (220a) and a second arm (220b) connected to the yoke and to at least one arm of flap (230a) by respective pivot connections (A2, A2', A3, A3'), said first arm and said second arm being arranged so as to cross and pivot relative to each other in a plane perpendicular to the flap and along the longitudinal direction of the boat X, said flap arm (230a) being connected to the flap (105) by at least one pivot connection (A4) with the flap.

5. System according to the preceding claim wherein the articulated assembly comprises at least a first (240a, 240b) set of active and / or passive motion control elements and at least a second set of active and / or passive motion control elements (245a, 245b) configured to respectively control the pivoting of the first arm and the second arm, said first set of motion control elements (240a, 240b) being arranged between the yoke (115) and the first arm (220a), and said second set (245a, 245b) of motion control elements being arranged between the yoke (115) and the second arm (220b).

6. System according to the preceding claim, wherein the first set of motion control elements and / or the second set of motion control elements are passive, each set of motion control elements respectively comprises a first return spring (240a, 245a) and a second return spring (240b, 245b).

7. System according to one of claims 5 to 6, wherein the first set of motion control elements and / or the second set of motion control elements are active, each set of motion control elements respectively comprises a first cylinder (240a, 245a) and a second cylinder (240b, 245b).

8. A system according to any preceding claim, wherein said base comprises a guide member for guiding a towing cable (340).

9. System according to the preceding claim, wherein the guide element is formed as a through opening, and when the shutter is placed in the raised configuration, a space is released and which is defined by an opening cone starting from said opening, said opening cone (360) being defined by an opening angle of at least 180 degrees in a plane perpendicular to the median plane XM, and at least 30 degrees in the median plane XM, preferably at least 60 degrees in the XM median plane.

10. System according to any one of the preceding claims, in which the lifting actuating means (260) is at least one hydraulic cylinder or at least one electric cylinder or at least one screw-nut system.

11. A system according to any preceding claim, wherein the wave propulsion system comprises at least one locking device for locking the flap in the working configuration or the raised configuration.

12. System according to any one of the preceding claims, in which the flap has a rectangular or triangular or trapezoidal or ellipsoidal shape in the XY plane, and a symmetrical NACA profile type shape in the XM plane.

13. A system according to any one of the preceding claims 5 to 13, wherein the shutter arm comprises at least one means (410) for actively adjusting an angle between the shutter and the shutter arm along a plane perpendicular to the shutter and along the transverse direction of the shutter.

14. An assembly comprising a system according to any one of the preceding claims and a boat, said system being mounted at the rear of the boat, preferably at the stern of the boat.

15. An assembly according to the preceding claim in which the boat is a cargo ship or a passenger ship.

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