• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to an acoustic structure for an aircraft nacelle which comprises an acoustically resistive substructure (44), at least one layer of cells (46), a reflective layer (48) and which is characterized in that it comprises at least one monobloc substructure (58) which compartmentalizes the cell layer (46) and integrates elongated elements (36) of a defrosting system.
    公开号:FR3041937A1
    申请号:FR1559431
    申请日:2015-10-05
    公开日:2017-04-07
    发明作者:Thierry Surply；Alain Porte
    申请人:Airbus Operations SAS；
    IPC主号:
    专利说明:

    COMPARTMENTED STRUCTURE FOR THE ACOUSTIC TREATMENT AND DEFROSTING OF AN AIRCRAFT NACELLE AND AN AIRCRAFT NACELLE INCORPORATING THE SAID STRUCTURE
    The present invention relates to a compartmentalized structure for the acoustic treatment and deicing of an aircraft nacelle and to a nacelle incorporating said structure.
    FR-2925463 discloses a structure for acoustic treatment positioned at an air inlet of an aircraft nacelle.
    This acoustic treatment structure comprises at least one acoustically resistive substructure, bands of cells arranged in a direction substantially perpendicular to a direction of flow of the air flow entering the nacelle and at least one reflective layer.
    Given the curved profile of an air inlet of a nacelle, there is a pressure gradient in the direction of flow of the air flow at the surface of the acoustically resistive substructure. Due to this pressure gradient, air streams can penetrate inside the acoustic structure at a first point and emerge at a second point offset in the direction of flow with respect to the first point. This phenomenon of air recirculation disturbs the flow of the air flow that enters the nacelle which can impact the operation of the engine.
    According to this document FR-2925463, to overcome this drawback, the structure comprises boxes oriented perpendicularly to the direction of flow. Each box has a U-shaped section whose branches are connected to the acoustically resistive substructure, at least one band of cells being enclosed between each box and the acoustically resistive substructure. According to this configuration, the caissons limit the appearance of air flows inside the cell strips
    According to one method of assembly, the end of each branch of the boxes comprises a flange which is plated and welded to the acoustically resistive substructure. According to one embodiment, all the boxes are connected and form a substructure partitioning. This partitioning substructure is assembled with the acoustically resistive substructure and then machined to remove material from the partitioning sub-structure provided between the channels to clear the acoustically resistive substructure. This embodiment is relatively long, complex and therefore expensive.
    According to an embodiment described in this document FR-2,925,463, the acoustically resistive substructure comprises a first layer in contact with the air flow and a second layer interposed between the first layer and the cell strips, said second layer comprising grooves forming channels in the acoustically resistive substructure when the first and second layers are pressed against each other. According to this embodiment, hot air flows into the channels to provide the defrost function.
    The embodiments proposed by FR-2925463 are not fully satisfactory because the seal depends on the quality of the weld between the boxes and the acoustically resistive layer. According to another disadvantage, it is possible to obtain a sealing barrier only in one direction. Either the boxes are oriented perpendicular to the direction of flow and form sealing barriers in the direction of flow or the boxes are oriented in the direction of flow and form sealing barriers in a direction perpendicular to the direction of flow. flow direction.
    Also, the present invention aims to overcome the disadvantages of the prior art. For this purpose, the subject of the invention is an acoustic structure for an aircraft nacelle, which comprises, apart from the axis of the nacelle, an acoustically resistive substructure, at least one layer of cells, a layer reflective, elongate elements of a defrost system, first partitions arranged in transverse planes.
    According to the invention, this acoustic structure comprises a plurality of acoustic boxes juxtaposed with each other on at least a part of the periphery of the nacelle, each acoustic box being delimited by sealed side walls arranged in longitudinal planes, each box acoustic device comprising at least one monobloc substructure for compartmentalizing the cell layer which comprises: the first partitions and / or first parts of the first partitions connected to the acoustically resistive layer, interconnected by at least a portion of the side walls of the box acoustic, at least a portion of the side walls of the acoustic box, the elongate elements of the defrost system. The use of a monoblock substructure to compartmentalize the cell layer that integrates the elongated elements of the defrosting system simplifies the design of the acoustic structure. On the other hand, the monobloc substructure is in the form of a single rigid element which is easily assembled with the other elements of the acoustic structure. In addition, sealing barriers are obtained in two directions.
    According to another characteristic, the one-piece substructure comprises, interposed between the side walls of the acoustic box, second partitions and / or parts of second partitions connected to the acoustically resistive layer and configured to connect the first partitions and / or the first ones. parts of the first partitions.
    Preferably, the one-piece substructure comprises at least one layer of the acoustically resistive substructure. This solution makes it possible to optimize the tightness.
    According to a first variant, the acoustically resistive substructure comprises a perforated plate or sheet integrated into the monoblock substructure.
    According to another variant, the acoustically resistive substructure comprises a porous layer and a structural layer which comprises large openings closed by the porous layer, said structural layer being integrated into the monoblock substructure.
    According to another variant, the one-piece substructure comprises a first continuous surface against which the acoustically resistive substructure is bonded. Advantageously, the one-piece substructure comprises a first surface oriented towards the axis of the nacelle and a second surface opposite to the first surface, said second surface being continuous and forming a junction surface.
    According to a first variant, each acoustic box comprises a lid connected to the second surface of the monobloc substructure.
    According to one embodiment, the cover comprises the reflective layer and the second portions of the first partitions connected to the reflective layer. Preferably, the lid is monobloc. The invention also relates to a nacelle and an aircraft comprising an acoustic structure according to the invention. Other features and advantages will become apparent from the following description of the invention, a description given by way of example only, with reference to the appended drawings in which:
    FIG. 1 is a perspective view of an aircraft nacelle,
    FIG. 2 is a perspective section of an air intake of an aircraft nacelle which illustrates the invention,
    FIG. 3 is a perspective view of an acoustic box which illustrates a first embodiment of the invention,
    FIG. 4 is a perspective view of a first part of the acoustic box visible in FIG. 3,
    FIG. 5 is a perspective view of a cell panel configured to be disposed in a compartment of the acoustic box visible in FIG. 3,
    FIG. 6 is a perspective view of a second part of the acoustic box visible in FIG. 3,
    FIG. 7 is a section in a first longitudinal plane VII-VII of FIG. 9 of part of an acoustic box which illustrates a second embodiment of the invention,
    FIG. 8 is a section in a second longitudinal plane VIII - VIII of FIG. 9 of a part of the acoustic box which illustrates the second embodiment of the invention,
    FIG. 9 is a section in a first transverse plane IX-IX of FIG. 7 of a part of the acoustic box which illustrates the second embodiment,
    FIG. 10 is a sectional view in a second X-X transverse plane of FIG. 7 of a part of the acoustic box which illustrates the second embodiment,
    Figure 11 is a sectional view in a longitudinal plane of an acoustic box which illustrates a third embodiment of the invention.
    FIG. 1 shows a propulsion unit 10 of an aircraft connected to a wing by means of a mast 12. However, this propulsion unit could be connected to other areas of the aircraft.
    This propulsion unit comprises a motor arranged substantially concentrically in a nacelle 14 which allows in particular to channel a flow of air towards the engine.
    For the rest of the description, the longitudinal direction is parallel to the axis of the nacelle referenced 18. A longitudinal plane is a plane passing through the axis of the nacelle 18. A transverse plane is a plane perpendicular to the longitudinal direction. A radial direction is a direction perpendicular to the axis of the nacelle 18.
    The terms front and back refer to the flow direction of the airflow in the nacelle. The front is an area where the air flow enters the basket and the back to an area where the air flow out of the nacelle. In addition, the term aerodynamic surface corresponds to a surface of the nacelle in contact with the air flow. Finally, the term layer designates one or more layers bonded to each other which may be more or less thick.
    The nacelle 14 comprises at the front a lip 20 which is extended inside the nacelle 14 by an inner wall 22 and outside the nacelle 14 by an outer wall 24. The inner wall 22 delimits an inner duct 26 approximately cylindrical which channels the flow of air towards the engine.
    The lip 20 and the inner wall 22 form a subset of the nacelle called air inlet.
    According to one embodiment, the lip 20 comprises a first radius of curvature in a longitudinal plane (visible in FIG. 2) which forms approximately a C and a second radius of curvature in a transverse plane (visible in FIG. 1) approximately circular. . According to one embodiment, the lower portion of the lip 20 comprises a flat and the leading edge 28 of the lip which corresponds to the most forward line of the lip 20 is disposed in a plane which is inclined by relation to the longitudinal direction.
    The nacelle 14 comprises a front frame 30 which connects the inner wall 22 and the outer wall 24 and which forms with the lip 20 an annular duct 31 also called D-duct.
    The nacelle 14 includes a deicing system to limit the appearance or accumulation of frost or ice on the aerodynamic surface of the air intake.
    According to a first variant, the deicing system is of the pneumatic type. As illustrated in FIG. 2, the nacelle 14 comprises a supply of hot air connected to the annular duct 31. According to this first variant, the deicing system also comprises ducts 32 positioned near the aerodynamic surface of the inner wall 22 and configured for channeling hot air from the annular conduit 31 to outlets 34 opening into the inner conduit 26 and offset rearwardly relative to the annular conduit 31.
    According to a second variant, the deicing system is of the electric type. According to an embodiment illustrated in FIG. 10, the deicing system comprises electrical resistances 36 positioned near the aerodynamic surface of the air inlet.
    Whatever the variant, the deicing system comprises elongated elements 32 or 36 positioned near the aerodynamic surface of the air inlet, said elongate elements being present on at least a portion of said aerodynamic surface of the inlet air.
    To limit noise pollution, the nacelle 14 comprises at least one structure for the acoustic treatment hereafter called acoustic structure to absorb a portion of the sound energy, in particular using the principle of Helmholtz resonators.
    As illustrated in FIG. 2, an acoustic structure 40 forms part of the inner wall 22. According to one embodiment, this acoustic structure 40 comprises an acoustically resistive substructure, a cell layer and a reflective layer. In another embodiment, the acoustic structure 40 comprises an acoustically resistive substructure, a first cell layer, an acoustically resistive layer called a septum, a second cell layer, and a reflective layer.
    The acoustic structure 40 is sufficiently far from the lip, it does not include a defrost system.
    As the dilution ratio of the engines is becoming higher, the diameter of the nacelles tends to be more and more important. Therefore, to limit the impact of this increase in diameter on the mass of the nacelle, the air intake is becoming shorter. Also, the acoustically treated zone extends over the entire length of the inner duct 26 or even at the lip 22. For this purpose, the nacelle 14 comprises at least a second acoustic structure that integrates a deicing system.
    This acoustic structure comprises a plurality of boxes 42 juxtaposed to each other on at least a portion of the periphery of the nacelle and which form a first partition along the periphery of the nacelle. Each acoustic box 42 is delimited by two sealed side walls that can be made in one piece or in several parts.
    Each caisson 42 comprises, apart from the axis of the nacelle 18, an acoustically resistive substructure 44 in contact with the flow of air in operation, at least one cell layer 46 and a reflective layer 48.
    This acoustic box 42 also comprises at least one series of partitions 50 parallel to each other and arranged in transverse planes and which form a second partition in the longitudinal direction. Thus, according to one embodiment, each box comprises a plurality of volumes (five according to Figure 6) separated from each other by partitions 50 which prevent the flow of air from one volume to another in the direction longitudinal.
    According to a first variant visible in FIG. 11, the acoustic box 42 comprises a single series of first partitions 50 arranged in transverse planes.
    According to other variants visible in Figures 7 to 10, the housing 42 comprises a first series of first partitions 50 arranged in transverse planes and a second series of second partitions 52 arranged in longitudinal planes. As an indication, the first partitions 50 are spaced apart by a distance of between 20 and 60 mm. The second partitions 52 are disposed on at least a portion of the circumference of the air inlet and are spaced at an angle of between 10 and 60 °.
    The first partitions 50 are connected on the one hand to the acoustically resistive substructure 44 and on the other hand to the reflective layer 48.
    According to a first variant visible in FIGS. 4 to 6 and 11, the acoustic box 42 comprises only first partitions 50 arranged in transverse planes which are connected on the one hand to the acoustically resistive substructure 44 and on the other hand to the reflective layer 48. In this case, the first partitions 50 extend over the entire height of the acoustic structure 42 and limit the flow of air along the longitudinal direction in the acoustic structure 42. According to this variant, the acoustic structure 42 does not include second partitions 52.
    When the de-icing system comprises ducts 32, these ducts 32 are integrated in half-walls 53 arranged in longitudinal planes and which are connected to the acoustically resistive substructure 44 and are spaced apart from the reflective layer 48.
    According to another variant visible in FIGS. 7 to 10, the first partitions 50 and the second partitions 52 are connected on the one hand to the acoustically resistive substructure 44 and on the other hand to the reflective layer 48. In this case, the first partitions 50 and the second partitions 52 extend over the entire height of the acoustic structure 42 and limit the flow of air along the longitudinal and transverse directions in the acoustic box 42.
    According to a first embodiment shown in FIG. 11, a partition 50 or 52 is made in one piece.
    According to other embodiments visible in FIGS. 3 to 10, a partition 50 (or 52) is made in two parts, a first part 50.1 (or 52.1) connected to the acoustically resistive substructure 44 and a second part 50.2 (or 52.2) connected to the reflective layer 48. According to these embodiments, for each partition, the first and second portions 50.1 (or 52.1) and 50.2 (or 52.2) are disposed edge to edge. Advantageously, a seal is interposed between the first and second parts 50.1 (or 52.1) and 50.2 (or 52.2) of the same partition 50 (or 52).
    According to another characteristic of the invention, the first partitions or the first parts of the first partitions are interconnected by the second partitions or the first parts of the second partitions so as to delimit compartments 54 which each contain at least one panel of cells 56. Each cell panel 56 includes a plurality of adjacent conduits each opening at one end toward the acoustically resistive substructure 44 and at a second end toward the reflective layer 48.
    According to a first variant, a compartment 54 comprises a single cell panel in the direction of the radial direction.
    According to another variant, a compartment 54 comprises at least two cell panels 56 superimposed in the direction of the radial direction, the superimposed cell panels 56 being separated by an acoustically resistive layer called septum.
    The cell panels 56 have dimensions adapted to the compartments 54 which contain them so as to be immobilized therein.
    According to one embodiment, each cell panel 56 is a metal honeycomb panel or composite material.
    The elongate elements 32 or 36 of the defrosting system are integrated in the partitions 50 and / or 52.
    In the case of elongated elements 32 in the form of ducts, the latter are integrated in the second partitions 52 or half-partitions 53 parallel to the longitudinal direction, as illustrated in FIGS. 3 to 10.
    In the case of elongated elements 36 in the form of electrical resistances, the latter are integrated in the first partitions 50 as illustrated in FIG. 11 or in the second partitions 52.
    According to the invention, the acoustic box 42 comprises at least one monobloc substructure 58 which comprises partitions 50 or parts 50.1 of partitions arranged in transverse planes which are connected by at least a part of the side walls of the acoustic box 42. According to other embodiments, the bulkheads 50 or parts 50.1 of partitions arranged in transverse planes are connected by partitions 52 or partition portions 52.1 or half-walls 53 arranged in longitudinal planes.
    By a monobloc substructure, it is meant that the partitions 50, 52 or parts of partitions or half-partitions 53 are interconnected and made in one piece.
    According to the invention, the monobloc substructure 58 comprises the elongate elements 32, 36 of the deicing system.
    This design ensures a better seal between the compartments 54 compared to the solutions of the prior art. In addition, it is possible to obtain sealing barriers in two directions (longitudinal and transverse).
    According to a first embodiment, the monoblock substructure 58 is metallic and made for example by machining, by molding, by profiling. To ensure optimum sealing, the monobloc substructure 58 is not mechanically welded.
    According to a second embodiment, the one-piece substructure 58 is made of composite material and made for example by hot forming, by molding.
    Each partition wall 50, 52 or partition part 50.1, 50.2 or half-wall 53 formed by the one-piece substructure 58 comprises a first edge positioned at a first surface 60 facing the axis of the nacelle 18 and a second edge positioned at a second surface 62 opposite the first surface 60. Preferably, the second surface 62 is continuous, includes no recess and thus forms a junction surface.
    To simplify the figures, the first and second surfaces 60, 62 are shown planar. In fact, the first and second surfaces 60, 62 are curved and have at least one radius of curvature to adapt to the curved profiles of the inner duct 26 and / or the lip 22.
    According to a first variant, the one-piece substructure 58 comprises at least one layer of the acoustically resistive substructure 44.
    According to a first embodiment visible in FIG. 11, the acoustically resistive substructure 44 comprises a perforated plate or sheet 64. By way of example, this plate or sheet is metallic. Preferably, this plate or perforated sheet 64 is integrated with the one-piece substructure 58. Thus, according to this embodiment, the perforated plate or sheet 64, the first and second partitions 50, 52, the first portions 50.1, 52.1 of the first and second partitions 50, 52 and the half-partitions 53 connected to the acoustically resistive substructure 44 are made in one piece.
    According to a second embodiment, the acoustically resistive substructure 44 comprises two superimposed layers, namely a porous layer, such as a wire mesh for example, and a structural layer which comprises large openings closed by the porous layer. Preferably, the structural layer is integrated with the monoblock substructure 58.
    According to other variants visible in Figures 3 to 10, the acoustically resistive substructure 44 and the monobloc substructure 58 are two separate parts. According to one embodiment, the acoustically resistive substructure 44 is glued against the first surface 60 of the one-piece substructure 58. The fact that the first surface 60 is continuous simplifies the bonding of the acoustically resistive substructure 44 against the monobloc substructure 58.
    According to a first variant visible in FIG. 11, the one-piece substructure 58 has a height (dimension in the radial direction) substantially equal to the height of the acoustic structure 42. According to this variant, the acoustic structure 42 comprises a cover 66 under the form of at least one non-perforated plate or sheet pressed against the second surface 62 of the one-piece substructure 58 to close the compartments 54 and to provide the function of the reflective layer 48.
    According to other variants visible in FIGS. 3 to 10, the monobloc substructure 58 has a height less than the height of the acoustic structure 42. According to these variants, the acoustic structure 42 comprises a cover 68 which comprises the reflective layer 48 and the second portions 50.2, 52.2 of the first and second partitions 50, 52 connected to the reflective layer 48. Preferably, the cover 68 is in one piece.
    FIGS. 3 to 6 show an embodiment of an acoustic box 42 configured for a pneumatic deicing system.
    According to this embodiment, the acoustic box 42 comprises a monobloc substructure 58, a cover 68, cell panels 56 positioned in the compartments 54 formed by the one-piece substructure 58 and the cover 68 when they are assembled.
    Preferably, the acoustic box 42 extends towards the rear of the nacelle from a junction zone 70 between the lip 20 and the front frame 30, as illustrated in FIG. 2.
    As illustrated in FIG. 6, the one-piece substructure 58 comprises the acoustically resistive substructure 44, the half-partitions 53 and the first part 50.1 of the first partitions 50.
    The one-piece substructure 58 has a rectangular shape with a leading edge 72, a trailing edge 74, a right side edge 76 and a left side edge 78. The leading and trailing edges 72, 74 are disposed in transverse planes and the edges lateral 76 and 78 are arranged in longitudinal planes.
    The first surface 60 of the one-piece substructure 58 comprises at the front edge 72 a recess 80 for accommodating the walls of the front frame 30 and the lip 20.
    The one-piece substructure 58 also comprises at the front edge 72 a strip of material 82 which extends from the right lateral edge 76 to the left lateral edge 78 and from the first surface 60 to the second surface 62. material strip 82 is traversed by the ducts 32 of the deicing system. Between the ducts 32, the strip of material 82 comprises housings 84 in which are arranged the connecting elements 86 for connecting the acoustic structure 42 to the lip 20 and to the front frame 30.
    The half-walls 53 extend from the strip of material 82 to the rear edge 74. These half-partitions 53 are regularly spaced. One of them is positioned at the left lateral edge 78. Each half-wall 53 comprises a duct 32 of the defrosting system. In a transverse plane, these half-walls 53 each have an approximately square section.
    None are positioned at the right side edge 76. The right side edge 76 includes a portion of a second wall 52.1.
    The rear edge 74 comprises a rear wall 88 which is arranged in a transverse plane and which has a height greater than the acoustic structure 42.
    The first partitions 50 extend from the right lateral edge 76 to the left lateral edge 78. The acoustically resistive substructure 44 integrated into the one-piece substructure 58 is in the form of a perforated plate at the compartments 54. .
    As illustrated in FIG. 4, the cover 68 comprises a bottom plate 90, lateral walls 92, 94, a rear wall 96, an inclined section 98 extended by a front wall 100 substantially parallel to the bottom plate 90.
    The side walls 92, 94 and the rear wall 96 are substantially perpendicular to the bottom plate 90.
    The second portions 50.2 of the first partitions 50 are perpendicular to the bottom plate 90 and extend from one side wall to the other. They are configured to be arranged in the extension of the first parts 50.1 of the first partitions 50 of the monobloc substructure 58.
    The side walls 92, 94 are configured to be arranged in the extension respectively of the second wall portion 52.1 positioned at the right lateral edge 76 and the half-wall 53 positioned at the left lateral edge 78. Thus, the wall 92 of the cover 66 and the portion of the second partition 52.1 form a first sealed side wall of the acoustic box 42. The side wall 94 of the lid and the half-wall 53 form the second sealed side wall of the acoustic box 42. When the lid 68 and the one-piece substructure 58 are connected, the rear wall 96 of the cover 68 is pressed against the rear wall 88 of the one-piece substructure 58.
    The front wall 100 is configured to be pressed against the material strip 82 of the one-piece substructure 58. This front wall 100 comprises cutouts 102 to disengage the housings 84.
    According to one embodiment, the cover 68 and the one-piece substructure 58 are connected by bolts and / or screws. Thus, a first series of screws 104 connects the front wall 100 of the cover 68 and the material strip 82 of the one-piece substructure 58 and a second series of bolts 106 connects the rear wall 96 of the cover 68 and the rear wall 88 of the monobloc substructure 58.
    Finally, each side wall 92, 94 comprises a series of orifices 108 for connecting two acoustic structures 42 to each other.
    According to the embodiment shown in Figures 3 to 6, there is obtained a first longitudinally oriented partition with longitudinal partitions only at the side edges 76 and 78 of each acoustic box and a second partition oriented transversely with transverse partitions 50.
    Thus, volumes delimited by two adjacent transverse partitions 50 and the sealed side walls of the acoustic caissons 42 or by a transverse partition 50 and the front or rear wall of the caissons and the sealed side walls of the acoustic caissons 42 are obtained.
    In this case, for each box, each cell panel 56 extends from one side wall to the other and comprises grooves for accommodating the half-walls 53.
    According to this embodiment, a first partitioning is obtained with a narrower step in the longitudinal direction, adapted to the strong pressure gradient in the longitudinal direction and a second partitioning with a greater pitch depending on the circumference of the nacelle, the gradient of pressure in this direction being lower.
    权利要求:
    Claims (12)
    [1" id="c-fr-0001]
    1. acoustic structure for an aircraft nacelle, comprising deviating from the axis of the nacelle (18), an acoustically resistive substructure (44), at least one layer of cells (46), a reflective layer (48), elongate elements (32, 36) of a defrosting system, first partitions (50) arranged in transverse pans, characterized in that the acoustic structure comprises a plurality of acoustic caissons (42) juxtaposed to each other on at least a portion of the periphery of the nacelle (18), each acoustic box (42) being delimited by watertight sidewalls disposed in longitudinal planes, each acoustic box (42) comprising at least one subwoofer; one-piece structure (58) for compartmentalizing the cell layer (46) which comprises: - the first partitions (50) and / or first parts (50.1) of the first partitions (50) connected to the acoustically resistive layer (44), connected interconnected by at least a portion of the side walls of the acoustic box (42), at least a portion of the side walls of the acoustic box (42), - the elongate members (32,36) of the defrost system.
    [2" id="c-fr-0002]
    2. Acoustic structure according to claim 1, characterized in that the monobloc substructure (58) comprises, interposed between the side walls of the acoustic box (42), second partitions (52) and / or parts (52.2) of second partitions (52) connected to the acoustically resistive layer (44) and configured to connect the first partitions (50) and / or the first portions (50.1) of the first partitions (50).
    [3" id="c-fr-0003]
    3. Acoustic structure according to claim 1 or 2, characterized in that the monobloc substructure (58) comprises at least one layer of the acoustically resistive substructure (44).
    [4" id="c-fr-0004]
    4. Acoustic structure according to claim 3, characterized in that the acoustically resistive substructure (44) comprises a plate or perforated sheet (64) integrated in the monobloc substructure (58).
    [5" id="c-fr-0005]
    5. Acoustic structure according to claim 3, characterized in that the acoustically resistive sub-structure (44) comprises a porous layer and a structural layer which comprises large openings closed by the porous layer, said structural layer being integrated into the sub-structure. one-piece structure (58).
    [6" id="c-fr-0006]
    6. Acoustic structure according to claim 1 or 2, characterized in that the monobloc substructure (58) comprises a first continuous surface against which is bonded your acoustically resistive substructure (44).
    [7" id="c-fr-0007]
    Acoustic structure according to one of the preceding claims, characterized in that the one-piece substructure (58) comprises a first surface (60) oriented towards the axis of the nacelle (18) and a second surface (62) opposite. at the first surface (60), said second surface (62) being continuous and forming a joining surface.
    [8" id="c-fr-0008]
    8. Acoustic structure according to claim 7, characterized in that each acoustic box (42) comprises a cover (66) connected to the second surface (62) of the monobloc substructure (58).
    [9" id="c-fr-0009]
    9. Acoustic structure according to claim 8, characterized in that the cover (66) comprises the reflective layer (48) and the second portions (50.2) of the first partitions (50, 52) connected to the reflective layer (48).
    [10" id="c-fr-0010]
    10. Acoustic structure according to claim 9, characterized in that the cover (68) is in one piece.
    [11" id="c-fr-0011]
    11. Nacelle comprising an acoustic structure according to one of the preceding claims.
    [12" id="c-fr-0012]
    Aircraft comprising an acoustic structure according to one of the preceding claims.
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    FR2978731A1|2013-02-08|Aircraft propulsion assembly, has reinforcement ring connected at air inlet and/or engine with opening and outer peripheral edge concentric with opening, on level of junction zone between interior air inlet pipe and engine pipe
    同族专利:
    公开号 | 公开日
    CN107010236A|2017-08-04|
    FR3041937B1|2017-10-20|
    US10273015B2|2019-04-30|
    US20170096230A1|2017-04-06|
    CN107010236B|2021-06-04|
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    法律状态:
    2016-10-20| PLFP| Fee payment|Year of fee payment: 2 |
    2017-04-07| PLSC| Publication of the preliminary search report|Effective date: 20170407 |
    2017-10-24| PLFP| Fee payment|Year of fee payment: 3 |
    2018-10-22| PLFP| Fee payment|Year of fee payment: 4 |
    2019-10-28| PLFP| Fee payment|Year of fee payment: 5 |
    2020-10-21| PLFP| Fee payment|Year of fee payment: 6 |
    2021-10-21| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1559431A|FR3041937B1|2015-10-05|2015-10-05|COMPARTMENTED STRUCTURE FOR THE ACOUSTIC TREATMENT AND DEFROSTING OF AN AIRCRAFT NACELLE AND AN AIRCRAFT NACELLE INCORPORATING THE SAID STRUCTURE|FR1559431A| FR3041937B1|2015-10-05|2015-10-05|COMPARTMENTED STRUCTURE FOR THE ACOUSTIC TREATMENT AND DEFROSTING OF AN AIRCRAFT NACELLE AND AN AIRCRAFT NACELLE INCORPORATING THE SAID STRUCTURE|
    CN201610861716.XA| CN107010236B|2015-10-05|2016-09-28|Acoustic structure for an aircraft nacelle, nacelle and aircraft comprising such a structure|
    US15/280,300| US10273015B2|2015-10-05|2016-09-29|Compartmentalized structure for the acoustic treatment and the de-icing of an aircraft nacelle and aircraft nacelle incorporating said structure|
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