ROLLING DEVICE FOR FLUID FLOW GENERATING DEVICE

Abstract

The invention relates to a corrugation device (300) for a fluid flow generating or recovering device extending in a longitudinal direction or flow direction (L), the corrugation device comprising at least one membrane (11) and a hooking system (200) connected to the at least one membrane, the flow generating device being of the type comprising an actuator configured to set said at least one membrane in motion via the hooking system, the movement of the at least one membrane setting the fluid surrounding it in motion, characterized in that the corrugation device comprises at least one rigidity element (180) extending at least partly along the at least one membrane. Figure to be published with the abstract: Fig. 2

Description

Title of the invention: ROLLING DEVICE FOR A FLUID FLOW GENERATING DEVICE TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates to a membrane attachment system for a fluid flow generating device, and / or for recovering the energy of a fluid, in particular for nautical propulsion and fluid transfer pumps. STATE OF THE ART

[0002] When a fluid is set in motion by a membrane, the latter is set into undulation.

[0003] The undulating movement is initiated by a rectilinear translational movement back and forth from one end of the membrane, for example an upstream edge for a rectangular or tubular membrane, or for example a peripheral circumferential edge for a discoidal membrane.

[0004] Then the movement is propagated by the elasticity of the membrane.

[0005] The invention aims to improve the performance of membrane devices. It is further intended to provide a simple, economical and ecological solution. SUBJECT OF THE INVENTION

[0006] For this purpose, and according to a first aspect, the invention proposes a corrugation device for a fluid flow generating or recovering device extending in a longitudinal direction or flow direction, the corrugation device comprising at least one membrane and a hooking system connected to the at least one membrane.

[0007] The flow generating device is of the type comprising an actuator configured to set said at least one membrane in motion via the attachment system, the movement of the at least one membrane setting the fluid surrounding it in motion. An alternative is the movement of the fluid setting the undulation device in motion so as to set the actuator operating in generator mode in motion.

[0008] The corrugating device comprises at least one stiffening element extending at least partially along the at least one membrane.

[0009] The corrugation device thus equipped makes it possible to improve the hydrodynamics of the moving membrane compared to the systems of the prior art. The energy efficiency of a motor or generator system equipped with said corrugation device is improved.

[0010] For the above and for the remainder of the description, the following terms are understood to mean:

[0011] - fluid flow generating device a system or apparatus equipped with an ac- tioner capable of operating in mode and / or in generator mode, placed in a fluidic medium such as liquid, in particular water in the general sense, or air, in particular the surrounding external air;

[0012] - rigidity element, also called reinforcing element, also called reinforcement element, a part having a rigidity greater than the rigidity of the membrane and increasing the stiffness or limiting the elasticity of the membrane, the part being able to have a surface and / or discontinuity, for example a solid surface, or a surface having openings.

[0013] For the above and for the remainder of the description, the term “membrane” means a membrane extending in a geometric plane, in particular when the membrane is at rest, for example a planar membrane. Preferably, the membrane has the shape of a sheet having elastic properties allowing it to be curved so as to produce successive undulations and / or oscillations.

[0014] Regardless of the shape, membrane means a part comprising at least one flexible or deformable part arranged to produce one or more undulations and / or oscillations.

[0015] For the above and for the remainder of the description, the term longitudinal direction or flow direction means the direction of movement, the direction of movement of the fluid, in particular when the device is static during its operation, or the direction of movement of the device, in particular when the device is mobile during its operation.

[0016] For the above and for the remainder of the description, fluid is understood to mean a liquid, gaseous, homogeneous or non-homogeneous medium, uncharged or charged, for example by fluidizable materials of the powder, foam or granule type...

[0017] According to different embodiments of the at least one corrugation device which can be combined:

[0018] - the at least one corrugating device extends parallel to the direction of de placement;

[0019] - according to one embodiment preferably in a substantially horizontal manner;

[0020] - according to another embodiment, preferably in a substantially vertical manner;

[0021] - the at least one corrugating device comprises at least one shaped membrane polygonal, preferably rectangular, or triangular, or trapezoidal, or hexagonal, preferably planar;

[0022] - the at least one device comprises at least one membrane having an edge of leak or a downstream edge in the shape of a palm, preferably having at least a V shape; this characteristic allows the flow to be concentrated and, by diversion, increases the speed of the fluid in the center of the membrane;

[0023] Preferably, each corrugating device comprises a single membrane.

[0024] According to different embodiments of the corrugation device which may or may not be combinable with themselves, and combinable with the preceding embodiments:

[0025] - the at least one rigidity element has mechanical properties of rigidity, in particular constant stiffness, greater than the mechanical stiffness properties of the at least one membrane;

[0026] - the at least one rigidity element has a Young's Modulus of between 50 and 250 Gpa;

[0027] - the at least one rigidity element is arranged on or in the at least one membrane;

[0028] - the corrugating device comprises a rigidity element and a membrane, the stiffening element being arranged on or in the membrane;

[0029] - the at least one rigidity element extends parallel to the at least one membrane;

[0030] - the at least one stiffening element extends along at least a portion of the width of the at least one membrane, preferably along at least 20% of the width of the at least one membrane, preferably along the entire width of the at least one membrane, the width of the at least one membrane extending transversely to the longitudinal direction;

[0031] - preferably the at least one rigidity element is centered relative to the at least a membrane;

[0032] - the at least one stiffening element extends along the length of the at least one membrane, preferably of an extent between 15% and 85% of the length of the at least one membrane, the length of the at least one membrane extending parallel to the longitudinal direction or the flow direction;

[0033] - preferably the length of the stiffening element is equal to 15% of the length of the membrane, preferably greater than 15% of the length of the membrane, preferably greater than 20% of the length of the membrane, preferably greater than 25% of the length of the membrane, preferably greater than 30% of the length of the membrane, preferably greater than 35% of the length of the membrane, preferably greater than 40% of the length of the membrane, preferably greater than 45% of the length of the membrane, preferably equal to 50% of the length of the membrane, preferably greater than 50% of the length of the membrane, preferably greater than 55% of the length of the membrane, preferably greater than 60% of the length of the membrane, preferably greater than 65% of the length of the membrane, preferably equal to 85% of the length of the membrane, preferably less than 85% of the length of the membrane, preferably less than 80% of the length of the membrane, preferably less than 75% of the length of the membrane,preferably less than 70% of the membrane length, preferably less than 65% of the membrane length, preferably less than , 60% of the membrane length, preferably less than 55% of the membrane length, preferably less than 50% of the membrane length, preferably less than 45% of the membrane length, preferably less than 40% of the membrane length;

[0034] - the at least one stiffening element extends along the length of the at least one membrane, preferably of an extent between 30% and 75% of the length of the at least one membrane, the length of the at least one membrane extending parallel to the longitudinal direction or the flow direction;

[0035] - the corrugating device comprises a leading edge or upstream edge and a leading edge trailing or downstream, and the trailing edge has increased flexibility relative to the leading edge, and / or the leading edge is more rigid than the trailing edge;

[0036] - the at least one rigidity element has perforations or openings, preferably distributed over its entire surface, in particular in order to allow the overmolding of at least one membrane on said associated element;

[0037] - the at least one rigidity element is fixed to the attachment system;

[0038] - according to one embodiment, the at least one rigidity element is fixed by through at least one membrane;

[0039] - the at least one rigidity element is inserted at least partially into the at least a membrane;

[0040] - the attachment system at least partially encloses an edge, or a side, of the at least one stiffness element, preferably entirely the edge or side of the at least one stiffness element;

[0041] - the attachment system at least partially encloses an edge, or a side, of the at least one membrane, preferably entirely the edge or side of the at least one membrane;

[0042] - the attachment system at least partially encloses an edge, or a side, of the assembly formed by the rigidity element and the membrane, preferably entirely the edge or the side of said assembly;

[0043] - the at least one rigidity element is inserted at least partially into the at least a membrane and the attachment system at least partially encloses an edge, or a side, of the assembly formed by the rigidity element and the membrane, preferably completely the edge or the side of said assembly;

[0044] - the at least one stiffening element has a variable thickness along the longitudinal direction, preferably decreasing thickness;

[0045] - the thickness of the stiffening element, preferably the blade, inside the membrane varies the flexibility of the membrane; the thinner the blade, the more flexible it is. This is why the tip of the blade will be the thinnest of the entire blade;

[0046] - the at least one rigidity element can be in one piece;

[0047] - the at least one rigidity element has at least one notch extending principally palely in a direction parallel to the longitudinal direction, this characteristic allowing flexibility of the at least one membrane at the level of said notch;

[0048] - the at least one rigidity element is a blade, or has the general shape of a blade, or a plate, or a sheet, preferably of polygonal shape, preferably of rectangular shape;

[0049] - the corrugating device has a profile of the so-called "NACA" type, or wing profile of plane;

[0050] - preferably the corrugating device has a non-zero camber, and / or the corrugating device has two opposite longitudinal faces, one of the two faces having a length less than the length of the other of the two faces;

[0051] - said device comprises at least one fin extending along a lateral edge of the corrugating device, preferably the fin projecting in a direction normal to the plane of the membrane;

[0052] - said device comprises at least one reinforcing piece fixed to the at least one rigidity element and at least one membrane;

[0053] According to a second aspect, the invention provides a method of manufacturing a corrugating device according to one or more of the characteristics of the first aspect, comprising the following steps:

[0054] - provide or manufacture at least one membrane,

[0055] - insert or affix at least one rigidity element to the at least one membrane.

[0056] According to a variant, the method of manufacturing a corrugation device according to one or more of the characteristics of the first aspect, comprises the following steps:

[0057] - supply or manufacture and / or overmould at least one membrane,

[0058] - insert or affix at least one rigidity element to the at least one membrane.

[0059] For example, the membrane is manufactured by molding, in particular from plastic material.

[0060] According to one embodiment, the at least one rigidity element is glued to the at least one membrane, or vice versa.

[0061] According to another embodiment, the at least one rigidity element is fixed to the at least one membrane, for example by screwing means or riveting means.

[0062] Preferably, the assembly formed by the at least one membrane and the at least one rigidity element is connected to the attachment system, preferably by screwing means.

[0063] According to a third aspect, the invention provides a method of manufacturing a corrugating device according to one or more of the features of the first aspect, comprising the following steps:

[0064] - provide or manufacture at least one rigidity element,

[0065] - molding at least one membrane around the at least one rigidity element.

[0066] According to a variant, the method of manufacturing a corrugation device according to one or more of the characteristics of the first aspect, comprises the following steps:

[0067] - supply or manufacture and / or overmould at least one rigidity element,

[0068] - molding at least one membrane around the at least one rigidity element.

[0069] Preferably, the assembly formed by the at least one membrane and the at least one rigidity element is connected to the attachment system, preferably by screwing or riveting means.

[0070] Preferably, the at least one corrugation device and / or the at least one membrane may have the following characteristics:

[0071] - Shapes of membranes and / or corrugating device: rectangular, triangular, trapezoidal, hexagonal, cylindrical, circular, elliptical, discoidal, tubular, or a combination thereof;

[0072] - Membrane materials: elastomer, rubber, polyurethane, TPU, EPDM, silicone, nitrile, PTFE, PFA, or even composite like carbon fiber, or even plastics, or metals, or a combination of these;

[0073] - Number of membranes and / or corrugating devices: membrane(s) alone or multiples in series or in parallel, in phase or out of phase or in phase opposition to counteract imbalances, or a combination of these.

[0074] Preferably the membrane used comprises elastomeric, plastic, metallic, or polymeric materials, natural or not.

[0075] The movement of the corrugating device is achieved by a displacement of one end in alternating translation.

[0076] For example, the membrane and / or the corrugating device may be 2D or 3D, of the flat or planar type, of the cylindrical type, for example discoidal or ovoid, of the polygonal type, for example rectangular or trapezoidal, and / or at least one 3D membrane of the tubular type. The at least one membrane or the wall of the at least one membrane may have a constant or variable thickness along the at least one membrane or along the wall of the at least one membrane.

[0077] Preferably, each membrane and / or corrugating device may have various shapes, for example polygonal, rectangular, triangular, hexagonal, trapezoidal, cylindrical, circular, elliptical, discoidal, tubular. According to alternative embodiments, the at least one membrane and / or the at least one corrugating device may have a circumference with at least one straight portion and at least one curvilinear portion.

[0078] Each membrane is composed or made of one or more specific materials, for example marine, food, biocompatible, or hydrocarbon. For example, each membrane comprises one or more of the following materials: elastomer, rubber, polyurethane, TPU, EPDM, silicone, PTFE, nitrile, carbon fiber or even plastics, or metals.

[0079] Preferably, the undulating device or the fluid flow generating or recovering device may comprise several membranes. This characteristic makes it possible to increase the thrust or speed generated by the device without increasing the dimensions of this device. In the case where these membranes operate in phase opposition, this also makes it possible to counteract imbalances.

[0080] Each membrane and / or undulating device is arranged to be moved in translation in a rectilinear and reciprocating manner, or in pivoting and reciprocating manner. Each membrane and / or undulating device is provided to oscillate or undulate with a predetermined frequency and amplitude.

[0081] Preferably, the at least one membrane has the following characteristics:

[0082] - Shore A hardness of 50 to 90 ShA,

[0083] - thickness from 0.5 mm to 10 mm,

[0084] These characteristics allow an angular movement of 5° to 25°.

[0085] Preferably, the material of the stiffening element comprises or is made of stainless steel, for example stainless steel 301.

[0086] According to other aspects of the invention, it may be provided:

[0087] - a fluid flow generating device comprising a corrugating device according to one or more of the characteristics of the first aspect;

[0088] - a hydraulic thruster for the propulsion of nautical craft characterized in that that it comprises a corrugating device according to one or more of the characteristics of the first aspect;

[0089] - a hydrogenerator characterized in that it comprises a corrugation device according to one or more of the characteristics of the first aspect;

[0090] - a pump characterized in that it comprises a corrugation device according to one or more of the characteristics of the first aspect;

[0091] - a compressor characterized in that it comprises a corrugation device according to one or more of the characteristics of the first aspect;

[0092] - a fan characterized in that it comprises a corrugation device according to one or more of the characteristics of the first aspect;

[0093] - a nautical craft comprising a hydraulic thruster according to one of the aspects below- above, and the at least one actuator arranged to set in motion the at least one membrane being arranged in the nautical craft, in particular within the hull of said craft.

[0094] Each device above according to the invention has the advantages of offering a reduced size, and of allowing a back and forth movement at high frequency. This arrangement also makes it possible to offer a device offering a low manufacturing and maintenance cost. BRIEF DESCRIPTION OF THE FIGURES

[0095] Other characteristics and advantages of the invention will emerge from the detailed description of the invention which follows with reference to the appended figures and in which:

[0096] [Fig. 1a] [Fig. 1a] is a perspective view of a hydraulic thruster equipped with undulating devices in a substantially vertical position according to a particular embodiment;

[0097] [Fig. 1b] [Fig. 1b] is a side view of a portion of a hydraulic thruster according to [Fig.1a], with only one corrugation device visible;

[0098] [Fig. 1a] [Fig. 1a] is a front view of a portion of a hydraulic thruster according to [Fig. 1a], two corrugating devices being visible;

[0099] [Fig.2] [Fig.2] is a perspective view of a corrugating device according to one embodiment, comprising a membrane having a straight trailing edge;

[0100] [Fig.3] [Fig.3] is a side view of a corrugating device according to one embodiment;

[0101] [Fig.4a] [Fig.4a] is a perspective view of a gripping system according to one embodiment, comprising a profiled leading edge area and a "C"-shaped gripping area;

[0102] [Fig.4b] [Fig.4b] is a perspective view of a rigidity element assembly placed in the middle of a membrane according to one embodiment;

[0103] [Fig.4c] [Fig.4c] is a perspective view of a stiffening element assembly placed in the middle of a membrane according to one embodiment, the stiffening element having the shape of a blade;

[0104] [Fig.5] [Fig.5] is a front view of a rectangular-shaped stiffening element according to one embodiment, comprising perforations and two notches;

[0105] [Fig.6] [Fig.6] is a perspective view of a corrugating device according to one embodiment;

[0106] [Fig.7] [Fig.7] is a view according to [Fig.6], the device further comprising reinforcing pieces on each lateral side according to one embodiment;

[0107] [Fig.8a] [Fig.8a] is a perspective view of a corrugating device according to one embodiment, comprising a membrane having a straight trailing edge and two reinforcing pieces each having two fins extending in a direction normal to the plane of the device;

[0108] [Fig.8b] [Fig.8b] is a perspective view of a corrugating device according to one embodiment, comprising a membrane having a rectilinear trailing edge and a reinforcing piece arranged on a single lateral side having two fins extending in a direction normal to the plane of the device;

[0109] [Fig.8c] [Fig.8c] is a perspective view of a corrugating device according to one embodiment, comprising two reinforcing pieces each having two fins extending in a direction normal to the plane of the device.

[0110] For clarity, identical or similar elements of the different embodiments are identified by identical reference signs throughout the figures. DETAILED DESCRIPTION OF THE INVENTION

[0111] In relation to figures 1a, 1b and 1c, a hydraulic thruster 1 is described for propelling a nautical craft. The thruster comprises means for connection to a hull of a boat or a watercraft and a device for generating energy from a fluid flow 100 arranged to move said boat (not shown) in a direction of movement L.

[0112] According to the embodiment illustrated by figures 1a, 1b and 1c, the hydraulic thruster comprises two undulation devices 300. The thruster comprises a mast, an offset frame carrying the fluid flow generating device, the offset frame being connected to one end of the mast, called the submerged end. The offset frame is intended to be submerged during operation and is arranged so that the longitudinal direction of the membrane is parallel to the direction of movement of the fluid or the boat.

[0113] According to the embodiment shown, the offset frame 15 is arranged in a substantially vertical plane and its longitudinal length extends in a direction substantially parallel to the direction of movement of the device or of the fluid in operation. The offset frame extends from the attachment point of the mast.

[0114] The offset frame comprises an offset shaft 156, extending substantially parallel to the mast, and a flange of generally rectangular shape extending along a substantially vertical plane and extending parallel to the longitudinal direction or direction of movement. The flange in association, in particular opposite, with at least one membrane and / or a corrugation device allows the fluid to be set in motion.

[0115] The offset frame encloses at least a portion of the actuation system from an actuator to gripping elements of the corrugating devices.

[0116] The device comprises two corrugation devices 300 arranged on either side of the offset shaft 156. The flange has the shape of an airplane wing and has two flange surfaces, each flange surface forming a flange for the corrugation device 300 opposite each other. According to the embodiment shown, each corrugation device has a substantially rectangular general shape.

[0117] Preferably, the offset frame comprises a rectangular-shaped flange arranged to cooperate with at least one corrugation device 300.

[0118] The offset frame further comprises two horizontal sides 4 of ovoid shape, arranged above and below the corrugation devices 300.

[0119] Preferably, the thruster comprises two vertical rectangular undulating devices, in particular operating in phase opposition.

[0120] With reference to Figures 2 to 8c, several embodiments of corrugation devices are proposed.

[0121] With reference to Figures 2 and 3, the proposed corrugation device comprises a membrane 11, a rigidity element 180 and a hooking system 200 connected to the membrane and to the rigidity element.

[0122] During operation of the flow generating device, the undulation device is set in motion by an actuator (not visible) via the attachment system, the movement of the undulation device setting in motion the fluid which surrounds it between an upstream edge or a leading edge 301 then a downstream edge or a trailing edge 302 of the device.

[0123] The attachment system 200 comprises a pivoting part 230 arranged to be connected to the actuation system. The attachment system 200 comprises a attachment or gripping part 232 arranged to be connected to the membrane 11 and / or the rigidity element 180. Depending on the embodiment, the attachment system contributes to the hydrodynamics of the undulation device. The attachment system comprises a profiled portion forming a leading edge of an aircraft wing, here the leading edge 301.

[0124] According to an exemplary embodiment, the attachment part 232 comprises holes 232a so as to insert attachment means, for example screws or rivets, so as to connect the membrane and / or the rigidity element.

[0125] Preferably and further with reference to [Fig.4a], the attachment part 232 has a "C"-shaped profile 232C so as to form two jaws encompassing the membrane and / or the rigidity element, in particular a so-called proximal end of the rigidity element and / or the membrane. Preferably, each jaw has holes 232a.

[0126] The rigidity element 180 extends inside the membrane. With reference to Figures 2, 3, 4b and 4c, the rigidity element has the shape of a plate or blade extending substantially in the center of the membrane 11, producing a superposition of layers in the following manner: membrane portion, rigidity element, membrane portion.

[0127] The rigidity element 180 has a proximal end 181. According to the modes of embodiment shown, the proximal end 181 is not covered by the membrane. The proximal end 181 of the rigidity element 180 is arranged to be connected with the attachment system 200. Preferably, the proximal end 181 comprises holes 181a arranged or disposed to align with the holes 232a of the attachment system.

[0128] The stiffening element further has a distal end 182. According to the embodiments shown, the distal end 182 is covered with the membrane. According to different embodiments, the length of the stiffening element can vary in particular depending on the desired flexibility of the corrugating device.

[0129] Further, according to different embodiments, the flexibility may vary depending on the thickness of the stiffening element.

[0130] With reference to [Fig.3], several longitudinal sections of the stiffening element are illustrated with respect to the length L11 and the relative position of the membrane 11. According to one example, the stiffening element may have three successive sections, L180-R1, L180-R2, L180-R3, with a stiffening element length L180 of 200mm. - L180-R1: length 115mm, thickness 7mm; - L180-R2: length 45mm, thickness 5mm; - L180-R3: length 40mm, thickness 3mm.

[0131] Preferably, the Young's Modulus of the stiffness element is between 200 and 250 Gpa.

[0132] [Fig. 3] further illustrates the result obtained by the stiffening element. During operation, the corrugating device flexes from the mark or line 1 IR to the trailing edge 302, represented by the dotted lines forming a curve 1 Imvt.

[0133] With reference to [Fig.5], a particular embodiment of a rigidity element is proposed comprising perforations 189 allowing the assembly, in particular by molding, of the membrane on the rigidity element.

[0134] Optionally or independently, the rigidity element may comprise notches 185 of half-ovoid shape.

[0135] With reference to [Fig.7], the corrugating device may further comprise lateral reinforcing pieces 193. Preferably, a reinforcing piece has a generally rectangular shape and a C-shaped profile so as to encompass the lateral edges of the assembled membrane and stiffening element. This feature makes it possible to reinforce the rigidity of the first section of the stiffening element. The lateral reinforcing pieces may be fixed via holes 113a (visible in FIGS. 2, 4b, 4c) on the membrane 11, and via holes 183a on the stiffening element, and distributed along the lateral edge 303 of the corrugating device.

[0136] Optionally and with reference to Figures 8a, 8b and 8c, the device corrugation device may comprise at least one fin, in particular a lateral fin. [Fig.8a] shows fins 194 projecting in a direction normal to the plane formed by the membrane-rigidity element assembly. For example, the fin extends between 1 and 30 millimeters. Preferably, the fin extends from a lateral edge 303 of the corrugation device, in particular from the first section L180-R1 of the stiffness element. According to a variant, the fin may have a length substantially identical to the length of the stiffness element, see figures 8b, 8c. According to a particular embodiment, only one lateral edge may be equipped with a fin, see [Fig.8b]. According to another embodiment, a side edge of the device may be equipped with a double fin: one fin projecting from an upper face, or first face, and another fin projecting from a lower face, or second face, see figures 8a, 8b, 8c.Preferably, the fin or fins are connected to the reinforcement pieces 193 or form part of a single piece with the reinforcement piece or pieces.

[0137] Nomenclature:

[0138] Fluid flow generating device: 100

[0139] Upper and lower fairings: 4

[0140] Extension frame: 15

[0141] Extension shaft: 156

[0142] Undulation device: 300

[0143] Leading edge or upstream edge: 301

[0144] Trailing edge or downstream edge: 302

[0145] Lateral edge: 303

[0146] Hanging system: 200

[0147] Pivoting piece: 230

[0148] Hanging or gripping piece 232

[0149] Hanging piece hole: 232a

[0150] Hanging piece profile: 232C

[0151] Membrane: 11

[0152] Membrane upstream edge: 111

[0153] Downstream edge: 112

[0154] Lateral edge: 113

[0155] side hole: 113a

[0156] stiffness element: 180

[0157] proximal end of attachment: 181

[0158] distal end: 182

[0159] proximal hanging hole: 181a

[0160] side hanging hole: 183a

[0161] notch: 185

[0162]

[0163]

[0164] perforation of the rigidity element 189 reinforcement part - reinforcer: 193 fin: 194

Claims

Claims

1. Corrugation device (300) for a fluid flow generating or recovering device extending in a longitudinal direction or flow direction (L), the corrugation device comprising at least one membrane (11) and a hooking system (200) connected to the at least one membrane, the flow generating device being of the type comprising an actuator configured to set said at least one membrane in motion via the hooking system, the movement of the at least one membrane setting the fluid surrounding it in motion, characterized in that the corrugation device comprises at least one rigidity element (180) extending at least partly along the at least one membrane.

2. Corrugation device according to claim 1, wherein the at least one stiffness element has mechanical stiffness properties, in particular stiffness constant, greater than the mechanical stiffness properties of the at least one membrane, preferably the at least one stiffness element (180) is arranged on or in the at least one membrane (11).

3. Corrugation device according to one of the preceding claims, wherein the at least one stiffening element extends along the length of the at least one membrane by an extent of between 15% and 85% of the length of the at least one membrane, the length of the at least one membrane extending parallel to the longitudinal direction.

4. Corrugation device according to one of the preceding claims, in which the at least one rigidity element has perforations (189), preferably distributed over its entire surface.

5. Corrugation device according to one of the preceding claims, in which the at least one rigidity element (180) is fixed to the attachment system, preferably the at least one rigidity element (180) is inserted at least partially into the at least one membrane (11) and the attachment system (200) at least partially encloses an edge of the assembly formed by the rigidity element (180) and the membrane (11).

6. Corrugation device according to one of the preceding claims, wherein the at least one stiffening element (180) has a variable thickness along the longitudinal direction, preferably a decreasing thickness.

7. Corrugation device according to one of the preceding claims, wherein the at least one stiffening element (180) is a blade, preferably of polygonal shape, preferably of rectangular shape.

8. A corrugating device according to any preceding claim, wherein said device comprises at least one fin (194) extending along a lateral edge of the corrugating device, the fin projecting in a direction normal to the plane of the membrane.

9. Corrugation device according to one of the preceding claims, wherein said device comprises at least one reinforcing piece (193) fixed to the at least one rigidity element (180) and the at least one membrane.

10. Method for manufacturing a corrugation device (300) according to one of the preceding claims comprising the following steps: - providing or manufacturing and / or overmolding at least one membrane (H), - inserting or affixing at least one rigidity element (180) to the at least one membrane.

11. Method for manufacturing a corrugation device (300) according to one of claims 1 to 10 comprising the following steps: - providing or manufacturing and / or overmolding at least one rigidity element (180), - molding at least one membrane (11) around the at least one rigidity element.

12. Hydraulic thruster for the propulsion of nautical craft characterized in that it comprises a corrugation device according to one of claims 1 to 9.

13. Pump characterized in that it comprises a corrugation device according to one of claims 1 to 9.

14. Hydrogenerator characterized in that it comprises a corrugation device according to one of claims 1 to 9.

15. Fan characterized in that it comprises a corrugation device according to one of claims 1 to 9.

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