• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
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  • 优先权
    • 专利摘要:
    septa fixation in acoustic alveolar structure. it is an alveolar structure that includes cells in which septa are located to provide noise damping. the cells are formed by at least four walls in which at least two of the walls are substantially parallel to each other. septa include warp fibers and weft fibers which are substantially perpendicular to each other. the septa are oriented in the cells of the alveolar structure so that the weft fibers and / or the warp fibers are substantially perpendicular to the parallel walls.
    公开号:BR112014005197B1
    申请号:R112014005197-6
    申请日:2012-08-25
    公开日:2020-12-15
    发明作者:Fumitaka Ichihashi
    申请人:Hexcel Corporation；
    IPC主号:
    专利说明:

    Background of the invention 1. Field of the Invention
    [001] The present invention relates in general to acoustic systems that are used to attenuate noise. The invention involves the use of a honeycomb structure to manufacture nacelles and other structures that are useful in reducing the noise generated by aircraft engines or other sources of noise. More specifically, the invention relates to acoustic structures in which a septum material is inserted into the cells of a pre-existing honeycomb structure in order to obtain noise damping or attenuation. 2. Description of the Related Technique
    [002] It is widely recognized that the best way to deal with excessive noise generated by a specific source is to treat the noise at the source. This is typically achieved by adding acoustic damping structures (acoustic treatments) to the noise source structure. A particularly problematic noise source is the jet engine used in most passenger aircraft. Acoustic treatments are typically incorporated into the engine inlet, nacelle and exhaust structures. These acoustic treatments include acoustic resonators that contain relatively thin acoustic materials or grilles that have millions of holes that produce acoustic impedance for the sound energy generated by the engine. The basic problem faced by engineers is how to add these thin and flexible acoustic materials to the structural elements of the jet engine and the surrounding nacelle in order to obtain the desired noise attenuation.
    [003] A honeycomb structure has been a popular material for use in aircraft and aerospace vehicles since it is relatively sturdy and lightweight. For acoustic applications, the objective has been to somehow incorporate the thin acoustic materials into the honeycomb structure so that the cells of the honeycomb structure are closed or covered. Closing the cells with acoustic material produces the acoustic impedance on which the resonator is based.
    [004] An approach to incorporating thin acoustic materials into a honeycomb structure is referred to as a sandwich design. In this approach, the thin acoustic sheet is placed between two slices of honeycomb structure and connected in place so that a single structure is formed. This approach has advantages in the sense that sophisticated acoustic material designs that are woven, punched or engraved in the exact dimensions can be used and the connection process is relatively simple. However, a disadvantage of this design is that the strength of the structure is limited by the connection between the two honeycomb slices and the acoustic material. In addition, the connecting surface between the two honeycomb slices is limited to the surface area along the edges of the honeycomb structure. In addition, there is a possibility that some of the holes in the acoustic material may be inadvertently closed with excess adhesive during the bonding process.
    [005] A second approach uses relatively thick massive inserts that are individually linked in place within the cells of the honeycomb structure. Once in place, the inserts are drilled or otherwise treated so as to form the holes that are necessary for the inserts to function as an acoustic material. The approach eliminates the need to connect two slices of honeycomb to each other. The result is a sturdy structure to which the inserts are securely attached. However, this approach also has some disadvantages. For example, the cost and complexity of having to drill millions of holes in solid inserts is a major disadvantage. In addition, the relatively thick solid inserts make the honeycomb structure rigid and difficult to form in non-planar structures, such as nacelles for jet engines.
    [006] Another approach involves inserting relatively light septum tissue into the cell of the honeycomb structure to form a septum cap that has fixing flanges that are then glued to the walls of the honeycomb structure. The use of septum caps is described in U.S. Patent Nos. 7 434 659, 7 510 052 and 7 854 298. This type of process requires that the septum lids are frictionally locked inside the cell to keep the septum lids in place before permanent connection with the honeycomb structure wall . Friction locking of the septum caps is an important aspect of this type of septa insertion procedure. The septa can move or otherwise move during handling if friction locking is not adequate. Any displacement of the septa makes it difficult to apply adhesive evenly to the septa during bonding. The displacement of the septa also causes the uncontrolled alteration of the acoustic properties. In the worst case, the septum can fall completely out of the honeycomb cell if the friction lock is not adequate. Summary of the invention
    [007] According to the present invention, it has been found that the orientation of the septum tissue within the honeycomb cell is an important factor that determines the excellence with which the septum is frictionally locked on the walls of the honeycomb structure. honey. The invention is applicable to honeycomb cells that include at least two parallel walls where at least one of the parallel walls forms a part of the cell perimeter larger than one or more of the other non-parallel walls. It has been found that orienting the septum material so that the fibers extending between the two parallel walls are substantially perpendicular to the walls provides an effective way of frictionally locking the septum in the honeycomb structure. The present invention improves the use of the material and the friction locking of the septum in the honeycomb structure. The invention substantially reduces the costs of reconstruction and the inconvenience due to the fall of the septa outside the honeycomb structure or to the displacement during handling before or during the application of the adhesive.
    [008] The present invention relates to acoustic structures that are designed to be located close to a source of noise, such as a jet engine or other power installation. The structures include a honeycomb structure that has a first edge that will be located as close to the noise source and a second edge located away from the source. The honeycomb structure includes a plurality of walls that extend between the first and second edges of the honeycomb structure. The walls form a plurality of cells that each include at least four walls. At least two of the four walls that define each cell are substantially parallel to each other. The cell walls define a perimeter around the cell where at least one of the parallel walls forms a part of the cell perimeter larger than at least one of the other cell walls which is not parallel to the larger wall.
    [009] The septum that is inserted into the cell is an acoustic material that consists of a plurality of warp fibers and a plurality of weft fibers. The warp fibers and the weft fibers are substantially perpendicular to each other. Each of the warp fibers includes a resonant part that is located within the cell. Each warp fiber also includes fastening parts located at each end. Each of the weft fibers also includes a resonant part located within the cell and fixation parts located at each end. The fixing parts of the warp and weft fibers are attached to the walls of the honeycomb structure. As a feature of the invention, the septum is oriented in the cell so that the resonant parts of either the warp fibers or weft fibers are substantially perpendicular to the larger parallel cell wall.
    [010] The present invention also relates to precursor structures that are formed when the septum is blocked by friction within the honeycomb cell. Friction locking provided by the perpendicular orientation of the fibers of the septum (s) according to the present invention has been found to prevent the displacement of the septa within the honeycomb structure during all phases of routine handling of the structure precursor before and during the permanent connection of the septa with the honeycomb structure. The present invention also relates to methods for making acoustic structures.
    [011] The present invention has several advantages besides the safe friction locking of the septum in the nucleus. For example, the amount of septum material is reduced because the same degree of friction locking can be achieved with smaller size fixture parts. In addition, less material is wasted when the septum is cut from the septum tissue. In addition, less folding of the septum material occurs when the septum is inserted into the cell, since the size of the fixation part can be reduced and the perpendicular orientation of the tissue tends to reduce the formation of additional mesh in the fold. The perpendicular orientation of the fibers within the cell also tends to reduce the clumping of the septum material in the corners of the cell. The amount of adhesive needed to attach the septum to the wall of the honeycomb structure is also reduced due to the smaller fixing parts and the reduced pile of tissue. The septum can also be placed closer to the edge of the honeycomb structure, since the fastening parts need not be so long in order to obtain adequate friction locking. This is particularly advantageous for a thin honeycomb structure in which the size of the septum fixing part can approximate the thickness of the honeycomb structure.
    [012] The advantages discussed above and many other advantages presented and resulting from the present invention will be better understood by reference to the following detailed description when taken in conjunction with the accompanying drawings. Brief description of the drawings
    [013] Figure 1 is a perspective view of an exemplary acoustic structure according to the present invention.
    [014] Figure 2 is a simplified view showing the pattern for cutting two septa according to the present invention of a strip of acoustic tissue.
    [015] Figure 3 is a simplified view showing a prior art pattern for cutting septa from the same strip of acoustic tissue shown in Figure 2.
    [016] Figure 4 is a simplified view showing the orientation in a honeycomb cell of a septum cut from a strip of acoustic tissue, as shown in Figure 2.
    [017] Figure 5 is a simplified sectional view of Figure 4 showing the orientation of a weft fiber within a honeycomb cell and also showing the fiber fixation parts and the resonant part.
    [018] Figure 6 is a simplified view showing the orientation in a honeycomb structure of an alternative form of a septum according to the present invention.
    [019] Figure 7 is a simplified view showing the orientation in a honeycomb structure of another alternative form of a septum according to the present invention.
    [020] Figure 8 is an exploded perspective view showing a part of a massive shell, an acoustic structure and a perforated shell that are combined together to form an acoustic structure of the type shown in Figure 9.
    [021] Figure 9 is a partial sectional view of an exemplary acoustic structure (nacelle) that is located near a noise source (jet engine). The acoustic structure includes an acoustic honeycomb structure fitted between a solid shell and a perforated shell.
    [022] Figure 10 is a simplified view showing the orientation in a honeycomb structure of an embodiment of the present invention in which the septa are located at different heights within the same honeycomb structure.
    [023] Figure 11 is a simplified view showing the orientation in a honeycomb structure of an embodiment of the present invention in which two septa are located at different heights within a single honeycomb cell.
    [024] Figure 12 is a simplified view that demonstrates the insertion of a septum into the cells of a honeycomb structure to form a precursor structure in which the septa are chained together by friction within the cells.
    [025] Figure 13 is a simplified view showing an exemplary method for applying adhesive to the septum fibers' attachment parts. Detailed description of the invention
    [026] An exemplary acoustic structure according to the present invention is generally shown at 10 in Figures 1 and 8. The acoustic structure 10 includes a honeycomb structure 12 which has a first edge 14, which will be located as close to the noise source, and a second edge 16. The honeycomb structure 10 includes walls 18 that extend between the two edges 14 and 16 in order to define a plurality of cells 20. Each of the cells 20 has a depth (also referred to as basic thickness) which is equal to the distance between the two edges 14 and 16. Each cell 20 also has a cross-sectional area that is measured perpendicular to the cell walls 18. The honeycomb structure can be manufactured from any of the conventional materials used in the manufacture of honeycomb panels, including metals, ceramics and composite materials.
    [027] Septa 24 are located within cells 20. It is preferable, but not necessary, that septa 24 be located in most, if not all, of cells 20. In certain situations, it is desirable to insert septa 24 in just a few cells, in order to produce the desired acoustic effect. Alternatively, it is desirable to insert two or more septa in a single cell. It is also desirable to position the septa 24 at different depths within different cells 20 located in different places within the honeycomb structure.
    [028] In Figure 4, an exemplary septum 24 in accordance with the present invention is shown located within an exemplary honeycomb cell 26. The septum 24 is cut or otherwise formed from a sheet of acoustic material which is composed of woven fibers. The woven material includes warp fibers 28 and weft fibers 29 which are substantially perpendicular to each other.
    [029] The perimeter of cell 26 is defined or formed by cell walls 30, 32, 34, 36, 38 and 40. Cell walls 30 and 36 are parallel to each other and form a first pair of parallel cell walls. Cell walls 34 and 40 are also parallel to each other and form a second pair of parallel cell walls. Cell walls 32 and 38 are also parallel to each other and form a third pair of parallel walls. Since cell 26 does not have the shape of a regular hexagon, the first and second pairs of parallel walls are wider than the third pair of parallel walls. Each of the walls of the first and second pairs of parallel walls constitutes a part of the cell perimeter larger than each of the walls of the third pair of parallel walls.
    [030] According to the present invention, the septum 24 is oriented so that the warp fibers 28 are perpendicular to the pair of parallel walls 30 and 36 wider. This orientation also places the weft fibers 29 perpendicular to the other pair of parallel walls 34 and 40 wider. It has been found that orienting the fibers of the septum (s) in a direction perpendicular to the wider parallel walls provides an especially effective way of chafing the septum 24 within the cell 26.
    [031] Each of the weft and warp fibers includes a central resonant part and a fixation part located at each end of the fiber to secure the fibers to the cell walls. In Figure 5, a simplified cross-sectional view of the septum 24 is shown to show the resonant part 42 and the fastening parts 44 of the weft fiber 29. The fastening parts 44 are used to friction the septum 24 in place before the applying an adhesive to permanently connect the fixing parts 44 to the honeycomb wall. For the purposes of this detailed description, a fiber is oriented substantially perpendicular to a cell wall when the resonant part of the fiber is substantially perpendicular to the cell wall. Substantially perpendicular means that the angle between the resonant part of the fiber and the cell wall, in the plane of the septum, is between 80 and 100 degrees and, more preferably, between 85 and 95 degrees.
    [032] Any of the standard woven fiber acoustic materials can be used to form the septa. These acoustic materials are typically presented as relatively thin sheets of open mesh fabric that are specifically designed to provide noise attenuation. It is preferable that the acoustic material is an open mesh fabric woven from monofilament fibers. The fibers can be composed of glass, carbon, ceramic or polymers. Polymeric monofilament fibers made from polyamide, polyester, polyethylene chlorotrifluorethylene (ECTFE), ethylene tetrafluoroethylene (ETFE), polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), polyfluoroethylene propylene (FEP), polyether ether ketone (PEEK), polyamide 6 (Nylon 6, PA6) and polyamide 12 (Nylon 12, PA12) are just a few examples. An open mesh fabric made from PEEK is preferable for high temperature applications. Open mesh acoustic fabrics and other acoustic materials that can be used to form the septum lids according to the present invention are obtainable from a wide variety of commercial sources. For example, sheets of open mesh acoustic fabric can be obtained from SEFAR America Inc. (Buffalo Division Headquarters 111 Calumet Street Depew, NY 14043) under the SEFAR PETEX trademarks. SEFAR NITEX and SEFAR PEEKTEX.
    [033] Although the acoustic fabric can be made from a combination of different woven fibers, it is preferable that the fibers of the acoustic fabric are made from the same material. In many acoustic fabrics, fibers in the warp direction (warp fibers) are generally made from fibers of a smaller diameter than fibers in the weft direction (weft fibers). Therefore, weft fibers tend to be more resistant to less flexible than fibers in the warp direction. Less flexible fibers have been found to be more effective for chafing the septum in the cell wall. When possible, it is preferable that the septum is oriented so that the resonant parts of the less flexible weft fibers are perpendicular to the honeycomb wall that forms the largest part of the cell perimeter. The flexibility of the weft fibers can also be increased in relation to the warp fibers by changing the chemistry (and not the diameter) of the weft fiber, in order to obtain a more rigid fiber.
    [034] In woven fabrics in which fibers in one direction are less flexible or more resistant than fibers in the cross direction, more resistant fibers are commonly referred to as dominant fibers. The present invention can be used in connection with septa manufactured from all types of woven acoustic fabric, including those in which there is no dominant fiber. However, it is preferable that the woven septum material includes dominant fibers and that the dominant fibers are weft fibers.
    [035] The acoustic fabric is typically presented as a sheet of material that is cut into several strips. The septa are then cut from the strips. Figure 2 shows a simplified representation of part of a typical strip of acoustic material 72. Strip 72 includes weft fibers 74 and warp fibers 76. Weft fibers 74 are the dominant fibers. The septa for insertion into cells of the type shown in Figure 4 are cut from the strip, as outlined in 78 and 79. Cutting the strip to obtain a septum that can be oriented as in Figure 4 results in the waste of only a small part of the strip material. This is a valuable feature of the invention that results unexpectedly from having to cut the septum of the acoustic tissue strip in order to meet the orientation requirements presented above when the septa are inserted into the cells of the honeycomb structure.
    [036] The typical prior art method for cutting septa from a strip of acoustic material is shown in Figure 3. The identification numbers correspond to the identification numbers in Figure 2, except that “PA” has been added to identify the strip as being cut according to the prior art method. As can be seen, a substantial amount of acoustic material is wasted using the prior art method to form septa as compared to the present invention.
    [037] In Figure 6, an additional exemplary septum 50 in accordance with the present invention is shown located within an exemplary honeycomb cell 52. The septum 50 is cut or otherwise formed from a sheet of acoustic material that is composed of woven fibers in which the weft fibers 54 are less flexible (more resistant) than the warp fibers 56. The honeycomb cell 58 includes a pair of parallel walls 60 and 62 which are each much wider than the other two walls 64 and 68. As a preferred feature of the invention, the dominant weft fibers 54 are oriented perpendicular to the parallel walls 60 and 62 wider.
    [038] In Figure 7, another additional exemplary septum 51 in accordance with the present invention is shown located within an exemplary honeycomb cell 53. The septum 51 is cut or otherwise formed from a sheet of acoustic material that is composed of woven fibers in which the weft fibers 55 are less flexible (more resistant) than the warp fibers 57. The honeycomb cell 53 includes a first pair of parallel walls 61 and 63. Cell walls 65 and 67 are also parallel to each other and form a second pair of cell walls. Cell walls 69 and 71 are also parallel to each other and form a third pair of parallel walls. The first and second pairs of parallel walls are wider than the third pair of parallel walls. Each of the walls of the first and second pairs of parallel walls constitutes a larger part of the cell perimeter than each of the walls of the third pair of cell walls.
    [039] As discussed above, septum 51 is oriented so that the weft fibers 55 are perpendicular to the pair of parallel walls 65 and 67 wider. Inserting the septum so that the stiffer weft fibers 55 are perpendicular to the wider parallel walls provides an especially effective way of frictionally locking the septum 51 within the cell 53.
    [040] The present invention is applicable to a wide variety of cell conformations. The preferred cell cross-sectional shape is a polygon that has more than four walls that form the perimeter of the polygon and where the widths of the walls, relative to the perimeter, are not all the same. Hexagonal and rectangular cells with cross-sectional conformations similar to those shown in Figures 4, 6 and 7 are preferred.
    [041] The septa 24 can be inserted in the honeycomb cell in order to obtain a wide variety of acoustic designs. For example, the septa can be located at different levels within the honeycomb structure 12A, as shown in 24A and 24B in Figure 10. This type of design allows fine tuning of the noise attenuation properties of the acoustic structure. The two-level design shown in Figure 10 is intended to be just one example of the wide variety of multi-level septum arrangements that are possible according to the present invention. As will be understood by those skilled in the art, the number of different possible septum placement levels is extremely large and can be adjusted to meet specific noise attenuation requirements.
    [042] Another example of insertion configuration for septa 24 is shown in Figure 11. In this configuration, two sets of septa 24C and 24D are inserted into the honeycomb structure 12B in order to provide each cell with two septa. As is evident, numerous additional configurations are possible if three or more septa are inserted in a given cell. In addition, the multi-level insertion design shown in Figure 10 can be combined with the design of multiple inserts per cell shown in Figure 11, in order to obtain an unlimited number of possible septum insertion configurations that can be used to fine tune the acoustic structure in order to obtain an optimal noise attenuation for a given noise source.
    [043] The preferred method for inserting the septa into the honeycomb structure to form a precursor structure in which the septa are frictionally locked within the honeycomb cell is shown in Figure 12. The reference numbers used to identify the honeycomb structure in Figure 12 are the same as in Figure 1, except that they include a “P” to indicate that the structure is a precursor structure in which the septa are not yet permanently attached to the cell walls.
    [044] As shown in Figure 12, septum tissue 87 is cut from a strip of tissue material 85 in order to obtain a pre-cut septum of the type shown in Figure 2 at 78 and 79. An appropriately sized plunger 83 is used to force the septum tissue 87 through the matrix 89 to form the septum cap 24, which is then inserted into the cell using the plunger 83. It should be noted that it is preferable, but not necessary, to use of a cover folding matrix 89 to form the septum cover from the individual pieces of pre-cut acoustic tissue. It is possible to use the honeycomb structure as the matrix and form the septum cap simply by forcing the pre-cut tissue 87 into the cells using the plunger 83. However, the edges of many honeycomb panels tend to be relatively indented since the panels are typically cut from a larger block of honeycomb structure during the manufacturing process. Therefore, the edges of the honeycomb structure tend to retain, tear and contaminate the acoustic tissue when a flat sheet of tissue is forcibly inserted directly into the cell. Therefore, if desired, the lid folding matrix can be eliminated, but only if the edges of the honeycomb structure are treated to remove any rough or cut edges.
    [045] It is important that the size / conformation of the septum and the size / conformation of the plunger and the matrix are chosen so that the septum cap can be inserted into the cell without damaging the acoustic material, at the same time obtaining contact of sufficient friction between the septum fiber fixation parts and the cell wall to hold the septum in place during subsequent management of the precursor structure. Routine experimentation can be used to establish the necessary friction lock for septa made from a specific acoustic tissue, provided the guidelines presented above with respect to the orientation of the weft and warp fibers for various cell conformations are followed. The degree of locking or retention by friction must be sufficient to prevent the septum caps from moving or otherwise moving, even if the precursor structure falls inadvertently during handling.
    [046] A precursor structure is shown in 10p in Figure 12 in which the 24P septum caps are held in place only by friction locking; As mentioned earlier, the friction lock must be sufficient to hold the septum caps securely in place until they can be permanently bonded using an appropriate adhesive. The adhesive that is used can be any of the conventional adhesives that are used in the manufacture of honeycomb panels. Preferred adhesives include those that are stable at elevated temperatures (300 - 400 ° F). Exemplary adhesives include epoxies, acrylics, phenolics, cyanocrilates, BMIs, polyamide-imides and polyimides.
    [047] The adhesive can be applied to the interface of fiber / cell wall fixation parts using several known adhesive application procedures. An important consideration is that the adhesive must be applied in a controlled manner. The adhesive, at least, must be applied to the fiber fixation part at its interface with the cell wall. In some cases, it is desirable to fine tune the acoustic structure by covering part of the resonant part of the fibers with adhesive. The application of adhesive to the resonant part of the fibers results in closing or at least reducing the size of the openings in the mesh or other acoustic material. Uncontrolled application of adhesive to the resonant part of the septum is generally undesirable and should be avoided. Therefore, adhesive application procedures can be used that can provide selective and controlled application of adhesive to the fiber fixing part at its interface with cell walls.
    [048] An exemplary adhesive application procedure is shown in Figure 13. In this exemplary procedure, the 12P honeycomb structure is simply immersed in an adhesive bath 91 so that only the septum fibers' attachment parts are immersed on the sticker. The adhesive can be applied precisely to the interface of the cell / cell wall fixation using this immersion procedure, provided that the septa are chained by friction precisely at the same level before immersion. For septa located at different levels, several immersion steps are required. Alternatively, the adhesive can be applied using a brush or other application technique specific to the site. Some of these techniques can be used to coat the basic walls with the adhesive before the septum is inverted. Alternatively, the adhesive can be printed on canvas over the septum material and simulated before insertion into the core.
    [049] The immersion procedure for applying the adhesive that is shown in Figure 13 is preferred because the fiber fixing parts tend to twist the adhesive upward by capillary action. This upward twisting provides the formation of threads where the fiber fixing parts meet the cell wall. The formation of adhesive threads at the interface between the fiber fixing parts and the cell wall provides not only a good connection with the cell wall, but also a well-defined boundary between the adhesive and the resonant part, in order to ensure that the properties the septum acoustics are not inadvertently affected by the adhesive. The adhesive threads tend to cover and eliminate gaps of air that can form between the septum material and the cell walls due to folds in the material.
    [050] The acoustic structures according to the present invention can be used in a wide variety of situations in which noise attenuation is necessary. The structures are well suited for use in connection with power installation systems where noise attenuation is usually an issue. A honeycomb structure is a relatively light material. Therefore, the acoustic structures of the present invention are particularly well suited for use in aircraft systems. Exemplary uses include nacelles for jet engines, hoods for large turbines or piston engines and related acoustic structures.
    [051] The basic acoustic structure of the present invention is typically formed hot under the final shape of the engine nacelle and then the shells or sheets of external material are attached to the outer edges of the acoustic structure formed with the layer (s) ) of adhesive. This complete fit is cured in a retention tool, which maintains the complex shape of the nacelle during connection. As shown in Figure 8, for example, the acoustic structure 10 is attached on one side to a solid sheet or shell 80 and a perforated shell or sheet 82 is attached to the other side to form an acoustic panel. The connection of the solid shell 80 and the perforated shell 82 is typically achieved in a bonding tool at a high temperature and pressure. The connection tool is generally necessary in order to maintain the desired conformation of the acoustic structure during the panel forming process. In Figure 9, a part of the completed acoustic panel is shown in its position as part of a nacelle surrounding a jet engine, which is shown diagrammatically in 90.
    [052] Having thus described exemplary modalities of the present invention, those skilled in the art should note that the disclosure is only exemplary and that several other alternatives, adaptations and modifications can be made within the scope of the present invention. Accordingly, the present invention is not limited to the preferred embodiments and examples above, but is limited only by the claims that follow.
    权利要求:
    Claims (20)
    [0001]
    1. Acoustic structure that is adapted to be located close to a noise source, the acoustic structure FEATURED for comprising: a honeycomb structure comprising a first edge to be located as close to the noise source and a second edge, the honeycomb structure also comprising a plurality of walls, the walls comprising an upper edge located on the first edge of the honeycomb structure and a lower edge located on the second edge of the honeycomb structure, the walls further comprising side edges that extend between the first and second edges of the honeycomb structure, the walls being connected to each other along the side edges, the walls defining a plurality of cells in which at least one of the cells is defined by at least four of the walls and where at least two of the walls that define the cell form a pair of walls that are substantially parallel to each other and where the walls s define a perimeter around the cell in which at least one of the parallel walls forms a part of the cell perimeter larger than at least one of the cell walls which is not parallel to the larger wall; a septum located within the cell, the septum comprising an acoustic material comprising a plurality of warp fibers and a plurality of weft fibers, the warp fibers and weft fibers being substantially perpendicular to each other, each of which warp fibers comprise a resonator part located within the cell and fixation parts located at each end of the warp fiber and each weft fiber comprises a resonator part located within the cell and fixation parts located at each end the weft fiber, the septum being oriented in the cell so that the resonator parts or the warp fibers or weft fibers are substantially perpendicular to the larger wall in the direction that extends between the sides of the larger wall; and an adhesive that connects the fastening parts of the warp and weft fibers to the walls.
    [0002]
    2. Acoustic structure, according to claim 1, CHARACTERIZED by the fact that the warp fibers are more flexible than the weft fibers.
    [0003]
    3. Acoustic structure according to claim 2, CHARACTERIZED by the fact that at least a part of the weft fibers is substantially perpendicular to the larger wall in the direction that extends between the sides of the larger wall.
    [0004]
    4. Acoustic structure according to claim 1, CHARACTERIZED by the fact that at least one of the cells is defined by at least two pairs of walls, the walls of each pair being substantially parallel to each other.
    [0005]
    5. Acoustic structure, according to claim 1, CHARACTERIZED by the fact that the cell is defined by six walls.
    [0006]
    6. Acoustic structure, according to claim 2, CHARACTERIZED by the fact that the warp fibers have a cross-sectional diameter and the weft fibers have a cross-sectional diameter, the diameter of the weft fibers being greater than the diameter of the warp fibers.
    [0007]
    7. Precursor structure that is adapted to be manufactured in an acoustic structure that is adapted to be located near a noise source, the precursor structure FEATURED for understanding: a honeycomb structure comprising a first edge to be located as close of the noise source and a second edge, the honeycomb structure also comprising a plurality of walls, the walls comprising an upper edge located on the first edge of the honeycomb structure and a lower edge located on the second edge of the honeycomb structure of honey, the walls further comprising side edges extending between the first and second edges of the honeycomb structure, the walls being connected to each other along the side edges, the walls defining a plurality of cells in which at least one of cells is defined by at least four of the walls and at least two of the walls that define the cell form a pair of walls q u and are substantially parallel to each other and in which the walls define a perimeter around the cell in which at least one of the parallel walls forms a part of the cell perimeter larger than at least one of the cell walls which is not parallel to the larger wall; a septum located within the cell, the septum comprising an acoustic material comprising a plurality of warp fibers and a plurality of weft fibers, the warp fibers and weft fibers being substantially perpendicular to each other, each of which warp fibers comprise a resonator part located within the cell and fixation parts located at each end of the warp fiber and each weft fiber comprises a resonator part located within the cell and fixation parts located at each end the weft fiber, the septum being oriented in the cell so that the resonator parts of the warp fibers or weft fibers are substantially perpendicular to the larger wall in the direction that extends between the sides of the larger wall; and wherein the fastening parts of the warp fibers and / or weft fibers are frictionally attached to the walls.
    [0008]
    8. Precursor structure, according to claim 7, CHARACTERIZED by the fact that the warp fibers are more flexible than the weft fibers.
    [0009]
    9. Precursor structure according to claim 8, CHARACTERIZED by the fact that at least a part of the weft fibers is substantially perpendicular to the larger wall in the direction that extends between the sides of the larger wall.
    [0010]
    10. Precursor structure according to claim 7, CHARACTERIZED by the fact that at least one of the cells is defined by at least two pairs of walls, the walls of each pair being substantially parallel to each other.
    [0011]
    11. Precursor structure, according to claim 7, CHARACTERIZED by the fact that the cell is defined by six walls.
    [0012]
    12. Precursor structure according to claim 8, CHARACTERIZED by the fact that the warp fibers have a cross-sectional diameter and the weft fibers have a cross-sectional diameter, the diameter of the weft fibers being greater than the diameter of the warp fibers.
    [0013]
    13. Method to manufacture an acoustic structure that is adapted to be located near a source of noise, the method CHARACTERIZED by understanding the steps of: providing a honeycomb structure comprising a first edge to be located as close to the source of noise, and a second edge, the honeycomb structure also comprising a plurality of walls, the walls comprising an upper edge located on the first edge of the honeycomb structure and a lower edge located on the second edge of the honeycomb structure , the walls further comprising side edges extending between the first and second edges of the honeycomb structure, the walls being connected to each other along the side edges, the walls defining a plurality of cells in which at least one of the cells is defined by at least four of the walls and at least two of the walls that define the cell form a pair of walls that are substantially for them together and where the walls define a perimeter around the cell where at least one of the parallel walls forms a larger part of the cell perimeter than at least one of the cell walls that is not parallel to the larger wall; inserting a septum into the cell, the septum comprising an acoustic material comprising a plurality of warp fibers and a plurality of weft fibers, the warp fibers and weft fibers being substantially perpendicular to each other, wherein each of the fibers warp comprises a resonator part located within the cell and fixation parts located at each end of the warp fiber and wherein each of the weft fibers comprises a resonator part located within the cell and fixation parts located at each end of the weft fiber, the septum being inserted into the cell so that the resonator parts of the warp fibers or weft fibers are substantially perpendicular to the larger wall in the direction that extends between the sides of the larger wall; and connecting the fastening parts of the warp and weft fibers to the walls.
    [0014]
    14. Method for manufacturing an acoustic structure according to claim 13, CHARACTERIZED by the fact that the warp fibers are more flexible than the weft fibers.
    [0015]
    15. Method for manufacturing an acoustic structure according to claim 14, CHARACTERIZED by the fact that at least a part of the weft fibers is substantially perpendicular to the larger wall in the direction that extends between the sides of the larger wall.
    [0016]
    16. Method for making an acoustic structure according to claim 13, CHARACTERIZED by the fact that at least one of the cells is defined by at least two pairs of walls, the walls of each pair being substantially parallel to each other.
    [0017]
    17. Method for making an acoustic structure according to claim 14, CHARACTERIZED by the fact that the warp fibers have a cross-sectional diameter and the weft fibers have a cross-sectional diameter, the diameter of the weft fibers being greater than the diameter of the warp fibers.
    [0018]
    18. Method for manufacturing an acoustic structure, according to claim 17, CHARACTERIZED by the fact that the cell is defined by six 5 walls.
    [0019]
    19. Aircraft CHARACTERIZED for comprising an acoustic structure as defined in claim 1.
    [0020]
    20. Nacelle for an aircraft engine CHARACTERIZED for comprising an acoustic structure as defined in claim 1.
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    同族专利:
    公开号 | 公开日
    BR112014005197A2|2017-03-21|
    US20140110188A1|2014-04-24|
    RU2014113549A|2015-10-20|
    RU2594657C2|2016-08-20|
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    EP2754150A2|2014-07-16|
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    WO2013036391A3|2013-09-26|
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    CA2846847C|2016-06-14|
    CA2846847A1|2013-03-14|
    CN103975386A|2014-08-06|
    WO2013036391A2|2013-03-14|
    US8607924B2|2013-12-17|
    US20130062143A1|2013-03-14|
    JP5856677B2|2016-02-10|
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    法律状态:
    2018-12-11| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2020-03-03| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|
    2020-10-27| B09A| Decision: intention to grant|
    2020-12-15| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 25/08/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/227,755|2011-09-08|
    US13/227,755|US8607924B2|2011-09-08|2011-09-08|Anchoring of septums in acoustic honeycomb|
    PCT/US2012/052405|WO2013036391A2|2011-09-08|2012-08-25|Anchoring of septums in acoustic honeycomb|
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