Manufacturing method of acoustic liner structure and acoustic liner structure

Abstract

The invention relates to the technical field of acoustics, in particular to a manufacturing method of an acoustic liner structure and the acoustic liner structure. The acoustic lining structure comprises a first panel, an embedded tube plate, a surrounding wall structure and a second panel which are sequentially arranged in the thickness direction of the acoustic lining structure, the embedded tube plate and the first panel are matched to form a plurality of embedded tubes, the second panel is a through hole panel, and therefore the first panel, the embedded tube plate, the surrounding wall structure and the second panel are matched to form a plurality of acoustic elements. Each acoustic element is provided with a plurality of Helmholtz cavities arranged side by side, the spaced Helmholtz cavities are communicated through embedded pipes to form an element, other Helmholtz cavities which are communicated through or not through the embedded pipes form another element, and the silencing capacity of the acoustic liner structure can be enhanced through the strong coupling effect and the weak coherent coupling effect in different acoustic elements. According to the acoustic liner structure and the manufacturing method thereof, under the condition that the thickness of the acoustic liner structure is limited, the low-frequency, broadband and efficient noise elimination characteristics can be achieved, the manufacturing process is clear, and operability is high.

Description

Technical Field

[0001] The present invention relates to the field of acoustic technology, and in particular to a method for manufacturing an acoustic lining structure and the acoustic lining structure. Background Art

[0002] The aircraft nacelle is usually located at the tail or middle of the aircraft, which not only provides the required working environment for the engine, but also provides noise reduction, ventilation and cooling, drainage and pressure relief, lightning protection, fire detection and other functions for the aircraft flight. The acoustic liner (abbreviated as: acoustic liner) is a key component of the aircraft nacelle, which can effectively reduce the fan noise radiated from the engine inlet and outlet or the turbine noise refracted in the tail nozzle system.

[0003] In the related art, the sound lining structure based on the acoustic principle of the Helmholtz cavity has been applied to the aircraft nacelle. However, the working frequency band of the sound lining structure based on the acoustic principle of the Helmholtz cavity matches its geometric dimensions (cavity volume, through-hole cross-sectional area and through-hole height). If it is to be used in an ultra-high bypass ratio engine that produces a lower frequency, the cavity height of the Helmholtz cavity has to be increased to provide sufficient damping or suppression (the space for achieving lower frequency noise reduction by reducing the through-hole height or increasing the through-hole cross-sectional area has been compressed to a very small size at present), which is contrary to the design purpose of the aircraft nacelle to be as light and thin as possible.

[0004] Therefore, while keeping the total thickness of the sound lining structure unchanged or thinner, setting up a sound lining structure with low frequency, broadband, high-efficiency sound absorption characteristics and strong manufacturing operability will become the main development trend of future engine nacelle sound linings. Summary of the invention

[0005] The object of the present invention is to provide a method for manufacturing an acoustic lining structure and an acoustic lining structure, which can manufacture an acoustic lining structure with low-frequency, broadband and high-efficiency sound-absorbing characteristics, and the manufacturing process is clear and the operability is strong.

[0006] In order to achieve the above objectives, the following technical solutions are provided:

[0007] In a first aspect, a method for manufacturing an acoustic liner structure is provided, which is used to manufacture the acoustic liner structure, wherein the acoustic liner structure comprises a first panel, an embedded tube sheet, a surrounding wall structure, and a second panel which are sequentially arranged along the thickness direction of the acoustic liner structure; the embedded tube sheet cooperates with the first panel to form a plurality of embedded tubes; the second panel is a through-hole panel; the first panel, the embedded tube sheet, the surrounding wall structure, and the second panel cooperate to form a plurality of acoustic elements; the acoustic element has a plurality of Helmholtz cavities arranged side by side, the spaced Helmholtz cavities are connected through an embedded tube to form a primitive, and the other Helmholtz cavities connected through or not through the embedded tube form another primitive; the method for manufacturing the acoustic liner structure comprises the following steps:

[0008] Manufacturing a first panel, an embedded tube sheet, a surrounding wall structure and a second panel;

[0009] The formed first panel, the embedded tube sheet, the surrounding wall structure and the second panel are glued and fixed in order from bottom to top.

[0010] As an optional scheme for the manufacturing method of the acoustic liner structure, the manufacturing steps of the embedded tube sheet include: according to the arrangement of the embedded tubes of the acoustic liner structure in the design drawing, the embedded tube sheet is made by a plate punching process, or the embedded tube sheet is made by a resin deposition process.

[0011] As an optional scheme for the manufacturing method of the sound lining structure, the manufacturing steps of the surrounding wall structure include: selecting a plate material according to the shape and height of the surrounding wall structure of the sound lining structure in the design drawing; bending and cutting the plate material to form a sheet; a pair of the sheets are symmetrical and glued to form a cavity material; and a plurality of the cavity materials are glued and fixed in sequence to form the surrounding wall structure.

[0012] As an optional scheme for the manufacturing method of the sound lining structure, the manufacturing steps of the second panel include: drilling through holes in the plate according to the through hole arrangement of the sound lining structure in the design drawing; surface treating the bonding surface of the plate and laying a curing adhesive film; after the curing adhesive film is cured, using an air flow to blow away the adhesive film in the through holes from the non-bonding surface to form the second panel.

[0013] As an optional solution of the method for manufacturing the acoustic lining structure, the material of the first panel is steel, titanium alloy, aluminum alloy or composite material.

[0014] As an optional solution for the method of manufacturing the acoustic liner structure, the material of the embedded tube sheet is aluminum alloy or flexible material or composite material.

[0015] As an optional solution of the method for manufacturing the acoustic lining structure, the material of the surrounding wall structure is steel or titanium alloy or aluminum alloy or composite material.

[0016] As an optional solution of the method for manufacturing the acoustic lining structure, the material of the second panel is steel, titanium alloy, aluminum alloy or composite material.

[0017] In a second aspect, a sound lining structure is provided, comprising a first panel, an embedded tube sheet, a surrounding wall structure and a second panel arranged in sequence along the thickness direction of the sound lining structure; the embedded tube sheet cooperates with the first panel to form a plurality of embedded tubes; the second panel is a through-hole panel; the first panel, the embedded tube sheet, the surrounding wall structure and the second panel cooperate to form a plurality of acoustic elements; the acoustic element has a plurality of Helmholtz cavities arranged side by side, the spaced Helmholtz cavities are connected by an embedded tube to form a unit, and the other Helmholtz cavities connected by or not by the embedded tube constitute another unit.

[0018] As an optional solution for the sound lining structure, the surrounding wall structure is a hollow structure with two open ends, the first panel and the embedded tube sheet are sealed connected to one open end of the surrounding wall structure, and the second panel is sealed connected to the other open end of the surrounding wall structure.

[0019] As an optional solution for the acoustic liner structure, the cross-sectional shape of the embedded tube is circular, semicircular, elliptical, semi-elliptical, or polygonal.

[0020] As an optional solution for the sound lining structure, the cross-sectional shape of the through holes on the through-hole panel is circular, polygonal or elliptical; and the cross-sectional shape of the unit of the surrounding wall structure is polygonal or circular.

[0021] As an optional solution of the sound lining structure, the extending direction of the embedded tube in the sound lining structure is the same as or intersects with the incident direction of the noise source.

[0022] As an alternative to the acoustic liner structure, different acoustic elements are provided in the acoustic liner structure.

[0023] As an alternative to the acoustic liner structure, the acoustic elements in a certain area of ​​the acoustic liner structure are different from each other; or the acoustic elements in a certain area of ​​the acoustic liner structure are the same and different from the acoustic elements in another area.

[0024] As an alternative to the acoustic lining structure, the acoustic lining structure is in a flat plate form or a curved form.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The manufacturing method of the acoustic lining structure provided by the present invention has a clear process and strong operability. The acoustic lining structure manufactured by the method has a plurality of acoustic elements, and the porosity on the through-hole panel in the elementary element of each acoustic element can be adjusted to achieve efficient noise reduction in different frequency bands, and the sound elimination band at the resonance frequency in the low frequency range can be widened through the internal coupling effect.

[0027] Compared with the conventional sound lining structure for noise reduction, the design of the embedded tube in the sound lining structure provided by the present invention can generate a new sound absorbing frequency band and enhance the low-frequency sound absorbing capability. In addition, the weak coherent coupling effect between different primitives can further improve and broaden the sound absorbing capability of the entire sound lining structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0029] Figure 1 A schematic structural diagram of the application of the acoustic liner structure provided by an embodiment of the present invention in an aircraft nacelle;

[0030] Figure 2 A schematic structural diagram of a sound lining structure provided by an embodiment of the present invention;

[0031] Figure 3 An exploded schematic diagram of a sound liner structure provided by an embodiment of the present invention;

[0032] Figure 4 A schematic structural diagram of a first acoustic element provided by an embodiment of the present invention;

[0033] Figure 5 A schematic diagram of the structure of a second acoustic element provided by an embodiment of the present invention;

[0034] Figure 6 A schematic structural diagram of a third acoustic element provided by an embodiment of the present invention;

[0035] Figure 7 A schematic plan view of a first acoustic liner structure provided by an embodiment of the present invention;

[0036] Figure 8 A schematic plan view of a second acoustic liner structure provided by an embodiment of the present invention;

[0037] Fig. 9 A schematic plan view of a third acoustic liner structure provided by an embodiment of the present invention;

[0038] Fig.10 A schematic diagram of a manufacturing process of an embedded tube sheet provided in an embodiment of the present invention;

[0039] Fig.11 A schematic diagram of a manufacturing process of a surrounding wall structure provided by an embodiment of the present invention;

[0040] Fig.12 A schematic diagram of the structures of various sheets provided by an embodiment of the present invention;

[0041] Fig.13 A schematic diagram of forming a surrounding wall structure provided in an embodiment of the present invention.

[0042] Reference numerals:

[0043] 100, acoustic lining structure; 101, first panel; 102, embedded tube sheet; 103, surrounding wall structure; 104, second panel;

[0044] 10. First acoustic element; 11. Helmholtz cavity; 111. Back plate; 112. Side plate; 113. Through-hole panel; 1131. First through hole; 1132. Second through hole; 12. Embedded tube;

[0045] 20. Second acoustic element; 21. Helmholtz cavity; 211. Back plate; 212. Side plate; 213. Through-hole panel; 2131. First through hole; 2132. Second through hole; 22. Embedded tube;

[0046] 30. A third acoustic element; 31. A Helmholtz cavity; 311. A back panel; 312. A side panel; 313. A through-hole panel; 3131. A first through hole; 3132. A second through hole; 32. A first embedded tube; 33. A second embedded tube. DETAILED DESCRIPTION

[0047] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. In the accompanying drawings, components with the same or similar functions in various parts of the structure are represented by the same or similar numerical labels. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component.

[0048] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0050] In the description of the present invention, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0051] Figure 1 FIG. 1 is a schematic diagram showing the structure of the acoustic liner structure 100 provided in this embodiment when applied in an aircraft nacelle. Figure 1 As shown, the acoustic lining structure 100 can be laid in engine air intakes, reverse thrust devices, tail jet systems, etc., and can effectively reduce the fan noise and turbine noise that are radiated or refracted. For ease of understanding, the acoustic lining structure 100 described in the figure is in the form of a flat plate, but the present invention is not limited thereto in any way, such as being in a curved form, or having a form that is completely identical to the geometric shape of the support member to which it is applied.

[0052] In the related art, the acoustic elements of the sound lining structure are mostly designed based on the acoustic principle of the Helmholtz cavity. The Helmholtz cavity has a very strong silencing ability at its resonant frequency, but the corresponding frequency band is extremely narrow, and it is difficult to use it directly in the engine nacelle that generates noise in multiple frequency bands. Even if the periodic arrangement of Helmholtz cavities of different geometric sizes can obtain a wider silencing frequency band, it also greatly increases the design difficulty and manufacturing complexity. In addition, due to the limitation of the narrow nacelle space, the height of the Helmholtz cavity cannot be infinitely increased to reduce the low-frequency noise generated by the high bypass ratio engine.

[0053] Based on the above problems, Figure 2 A schematic structural diagram of the sound liner structure 100 provided in this embodiment is shown. Figure 3 FIG. 1 shows an exploded schematic diagram of the acoustic liner structure 100 provided in this embodiment. Figures 2 to 3 As shown, the acoustic liner structure 100 includes a first panel 101, an embedded tube sheet 102, a surrounding wall structure 103, and a second panel 104 which are sequentially arranged along the thickness direction of the acoustic liner. The second panel 104 is provided with a through hole. The first panel 101, the embedded tube sheet 102, the surrounding wall structure 103, and the second panel 104 together constitute a plurality of acoustic elements. The shape and structure of the acoustic elements can be adjusted to improve the sound absorbing effect of the acoustic liner structure 100 and broaden the sound absorbing frequency band. The acoustic element provided in this embodiment can improve the sound absorbing effect of the acoustic element and broaden the sound absorbing frequency band when the height size of the acoustic liner structure 100 is limited.

[0054] Figure 4 FIG. 2 shows a perspective view of a first acoustic element 10 provided in this embodiment. Figure 4As shown, the first acoustic element 10 includes four Helmholtz cavities 11 arranged side by side and an embedded tube 12. The Helmholtz cavity 11 includes a back plate 111, a side plate 112 and a through-hole panel 113. The side plate 112 is surrounded to form a wall structure with two ends open. The embedded tube 12 is located between the back plate 111 and the side plate 112. The through-hole panel 113 and the back plate 112 are sealed and connected to the two ends of the wall structure. The first Helmholtz cavity 11 and the fourth Helmholtz cavity 11 are connected through the embedded tube 12 to form a first unit, and the second Helmholtz cavity 11 and the third Helmholtz cavity 11 are not connected and form a second unit.

[0055] Of course, in other embodiments, the number of Helmholtz cavities 11 is not limited to four, but can be any number of three or more, and the number of embedded tubes 12 is not limited to one, but can be any number of two or more, wherein the spaced Helmholtz cavities 11 are connected through the embedded tubes 12 to form a unit, and the other Helmholtz cavities connected through or not through the embedded tubes 12 form another unit, and the two units are arranged in parallel, and low-frequency broadband noise reduction can be achieved through the coupling effect within or between units.

[0056] The mechanism by which the first acoustic element 10 has the low-frequency broadband sound-absorbing characteristic can be described as follows: 1) Under the condition of keeping the height of the Helmholtz cavity 11 unchanged, by setting the first element and the second element, efficient sound absorption at at least two resonant frequencies can be achieved; 2) The first element and the second element are cross-arranged, which breaks the sound absorption mode of the same Helmholtz cavity when it is arranged periodically, and regulates the coupling effect between the Helmholtz cavities 11 in each element, so that the sound absorption band of the acoustic element at the resonant frequency is widened, and the weak coherent coupling effect between the first element and the second element further improves and broadens the sound absorption ability of the entire acoustic element 10 or the sound lining structure 100; 3) The design of the embedded tube 12 causes the first element to produce a new sound absorption band, and the sound absorption band of the embedded tube 12 can be made close to the resonant frequency of the Helmholtz cavity 11 by regulating the geometric dimensions of the embedded tube 12, thereby enhancing the low-frequency sound absorption ability.

[0057] In this embodiment, the cross-sectional shape of the cavity of the Helmholtz cavity 11 is a regular hexagon. It can be understood that when the cavity of the Helmholtz cavity 11 is a regular hexagonal prism, the cavities of multiple Helmholtz cavities 11 can be arranged coplanarly to form a honeycomb structure, so as to arrange more acoustic elements under a limited area of ​​the sound lining structure 100, thereby improving the sound absorbing effect of the sound lining structure 100. In other embodiments, the cross-sectional shape of the cavity of the Helmholtz cavity 11 can also be a circle or other polygons.

[0058] In this embodiment, a first through hole 1131 is provided on the through hole panel 113 in the first primitive, and three second through holes 1132 are provided on the through hole panel 113 in the second primitive. The cross-sections of the first through hole 1131 and the second through hole 1132 include, but are not limited to, circular, elliptical or polygonal. When the cross-sections of the first through hole 1131 and the second through hole 1132 are circular, the first through hole 1131 and the second through hole 1132 have the same aperture to facilitate processing. Of course, in other embodiments, the number of the first through hole 1131 is not limited to one, but can be any number of two or more, and the number of the second through holes 1132 is not limited to three, but can be any number of one or more. In addition, the aperture of the first through hole 1131 can also be different from the aperture of the second through hole 1132, which can be designed according to needs and is not limited here.

[0059] In this embodiment, the main function of the embedded tube 12 is to form a channel in the four Helmholtz cavities 11. Therefore, the embedded tube 12 can be formed in various forms, as long as it can form a channel connecting the Helmholtz cavities 11 arranged at intervals, for example, the first type: the embedded tube 12 is an integrated structure formed by punching a flat plate to form a channel; the second type: the embedded tube 12 is a tube sheet with a cross-sectional shape of V-shaped, semicircular, or semi-elliptical, and the tube sheet and the back plate 111 are surrounded to form a channel connecting the Helmholtz cavities 11 arranged at intervals; the third type: the embedded tube 12 is a tube structure with a cross-sectional shape of circular, elliptical, or polygonal, which will not be described one by one here.

[0060] Figure 5 FIG. 2 shows a perspective view of a second acoustic element 20 provided in this embodiment. Figure 5 As shown, the second acoustic element 20 includes four Helmholtz cavities 21 and an embedded tube 22, and the cavity 21 includes a back plate 211, a side plate 212 and a through-hole panel 213. Among them, the first Helmholtz cavity 21 and the fourth Helmholtz cavity 21 are connected through the embedded tube 22 to form a first unit, and the second Helmholtz cavity 21 and the third Helmholtz cavity 21 are not connected and form a second unit. The main difference between the second acoustic element 20 and the first acoustic element 10 is that the cross-sectional shape of the embedded tube 22 is a square. The other structures of the second acoustic element 20 are the same as those of the first acoustic element 10, and will not be repeated here.

[0061] Figure 6 FIG. 2 shows a perspective view of a third acoustic element 30 provided in this embodiment. Figure 6As shown, the third acoustic element 30 includes four Helmholtz cavities 31 and two embedded tubes. The cross-sectional shape of the cavity of the Helmholtz cavity 31 is a regular hexagon. The Helmholtz cavity 31 includes a back plate 311, a side plate 312 and a through-hole panel 313. The cross-sectional shape of the embedded tube is a rectangle. For ease of understanding, the two embedded tubes are respectively recorded as the first embedded tube 32 and the second embedded tube 33, wherein the first Helmholtz cavity 31 and the third Helmholtz cavity 31 are connected through the first embedded tube 32 to form a first unit, and the second Helmholtz cavity 31 and the fourth Helmholtz cavity 31 are connected through the second embedded tube 33 to form a second unit. A first through hole 3131 is provided on the through-hole panel 313 of the first unit, and two second through holes 3132 are provided on the through-hole panel 313 of the second unit.

[0062] Of course, in other embodiments, the cross-sectional shape of the Helmholtz cavity 31 is not limited to a regular hexagon, but can also be a circle, other polygons, etc.; the cross-sectional shape of the embedded tube is not limited to a rectangle, but can also be a circle, an ellipse, other polygons, etc.; the number of the first through holes 3131 is not limited to one, and the number of the second through holes 3132 is not limited to two. The specific design can be based on needs, and no examples will be given here one by one.

[0063] As for the third acoustic element 30, since an additional embedded tube is designed in the element, the third acoustic element 30 can generate an additional sound-absorbing frequency band outside the resonance frequency of the corresponding element compared with the first acoustic element 10. However, it is worth noting that designing an additional embedded tube in the narrow acoustic element may bring many cumbersome and difficult aspects to the production and manufacturing, so it is necessary to comprehensively consider whether to design two embedded tubes according to actual requirements.

[0064] Based on the above three types of acoustic elements, it can be understood that the acoustic elements provided in this embodiment are not limited to the above three types. As long as there is at least one Helmholtz cavity between the connected cavities and there is no sound wave flowing into this cavity from the embedded tube connecting the Helmholtz cavities on both sides, examples will not be given one by one here.

[0065] Figure 7 FIG. 2 shows a schematic plan view of a first acoustic liner structure provided in this embodiment. Figure 7 Combination Figure 3 to Figure 4As shown, the first acoustic lining structure is formed by arranging a plurality of first acoustic elements 10 or a plurality of second acoustic elements 20. For example, the embedded tube can be an isosceles triangle or a rectangle. When the acoustic elements constitute the acoustic lining structure, the back plates of several acoustic elements constitute the first panel 101 of the acoustic lining structure, the Helmholtz cavities of several acoustic elements constitute the surrounding wall structure 103 of the acoustic lining structure, and the through-hole panels in several acoustic elements constitute the second panel 104 of the acoustic lining structure. When the embedded tube adopts the first method mentioned above (an integrated structure in which a channel is formed by punching a flat plate), the embedded tubes in several acoustic elements constitute the embedded tube sheet 102 of the acoustic lining structure. In the actual production process, the entire embedded tube sheet 102 can be formed by punching a plurality of channels on a flat plate, which can not only improve the processing efficiency, but also reduce the processing difficulty of the embedded tube sheet 102.

[0066] Continue to see Figure 7 , a parallel arrangement of embedded tube sheets and Helmholtz cavities in an acoustic element integrated sound liner structure numbered (A1, A2, A3, A4) and (B1, B2, B3, B4), wherein the noise source is incident along the extension direction of the embedded tube.

[0067] Figure 8 FIG. 2 shows a schematic plan view of a second acoustic liner structure provided in this embodiment. Figure 8 As shown, the second acoustic liner structure is formed by arranging a plurality of first acoustic elements 10 or a plurality of second acoustic elements 20, that is, the embedded tube is an isosceles triangle or rectangle. The main difference between the second acoustic liner structure and the first acoustic liner structure is that the embedded tube sheet and the Helmholtz cavity are arranged in parallel in the acoustic element integrated acoustic liner structures numbered (A1, A2, A3, A4) and (B1, B2, B3, B4), wherein the incident direction of the noise source intersects with the extension direction of the embedded tube, that is, there is a noise source component along the direction of the embedded tube.

[0068] Fig. 9 FIG. 2 shows a schematic plan view of a third acoustic liner structure provided in this embodiment. Fig. 9 As shown, the third acoustic lining structure is formed by arranging a plurality of acoustic elements such as the first acoustic element 10 or the second acoustic element 20 or the third acoustic element 30. The acoustic elements are numbered (A1, A2, A3, A4), (B1, B2, B3, B4), (C1, C2, C3, C4) and (D1, D2, D3, D4), wherein (A1, A2, A3, A4) and (B1, B2, B3, B4) are symmetrically arranged, (C1, C2, C3, C4) and (D1, D2, D3, D4) are symmetrically arranged, and there is a noise source component along the direction of the embedded pipe.

[0069] Based on the above three types of acoustic lining structures, it can be known that the acoustic lining structure provided in this embodiment includes but is not limited to one or more of the above three types of acoustic lining elements. For example, the acoustic lining structure can be composed of one type of acoustic element, or any two types of acoustic elements, or any three or more types of acoustic elements. The specific design can be based on the needs and is not limited here. For example, the acoustic elements of the acoustic lining structure in a certain area can be the same and different from the acoustic elements in another area; or the acoustic elements of the acoustic lining structure in a certain area can be different and different from the acoustic elements in another area.

[0070] On this basis, this embodiment further provides a method for manufacturing an acoustic lining structure, which is used to manufacture the above-mentioned acoustic lining structure. The method for manufacturing the acoustic lining structure comprises the following steps:

[0071] Manufacturing a first panel 101, an embedded tube sheet 102, a surrounding wall structure 103 and a second panel 104;

[0072] The formed first panel 101, the embedded tube sheet 102, the surrounding wall structure 103 and the second panel 104 are glued and fixed in order from bottom to top.

[0073] In this embodiment, the material of the first panel 101 is steel, titanium alloy, aluminum alloy or composite material.

[0074] Fig.10 FIG. 1 shows a schematic diagram of the manufacturing process of the embedded tube sheet 102 provided in this embodiment. Fig.10 As shown, the manufacturing steps of the embedded tube sheet 102 include: designing the arrangement of the protrusions of the mold according to the arrangement of the embedded tubes of the acoustic liner structure in the design drawing, and then using a plate punching process to make the embedded tube sheet 102, or using a resin deposition process to make the embedded tube sheet 102. The plate can be a metal plate, etc. In this embodiment, the material of the embedded tube sheet 102 is aluminum alloy, flexible material, or composite material.

[0075] In this embodiment, adhesive material is adhered to both sides of the plate, and a predetermined embedded tube sheet is obtained on a mold by cutting the plate forming technology, or the embedded tube sheet 102 having a certain flexibility is formed by resin deposition on the mold.

[0076] Fig.11 FIG. 1 shows a schematic diagram of the manufacturing process of the surrounding wall structure 103 provided in this embodiment. Fig.11 As shown, the manufacturing steps of the surrounding wall structure 103 include: selecting a plate according to the cavity shape and height of the Helmholtz cavity of the sound lining structure in the design drawing; bending and cutting the plate to form a sheet; a pair of sheets are symmetrical and glued to form a cavity material; and a plurality of cavity materials are glued and fixed in sequence to form the surrounding wall structure 103. In this embodiment, after the cavity materials are glued to form the surrounding wall structure 103, they are placed in a curing device for curing.

[0077] Fig.12 FIG. 2 shows a schematic diagram of the structure of the sheet material provided in this embodiment. Fig.12 As shown, the plate is formed into four types of sheets by bending and cutting. Of course, in other embodiments, the plate can also be formed into other types of sheets by bending and cutting, which will not be illustrated one by one here.

[0078] Fig.13 FIG. 1 shows a schematic diagram of forming the surrounding wall structure 103 provided in this embodiment. Fig.13 As shown, multiple pairs of sheets are symmetrically glued and fixed to form cavity materials, and multiple cavity materials are glued and fixed to form the surrounding wall structure 103. Of course, in other embodiments, the cavity material can also be other types, which can be designed and manufactured according to needs, and are not limited here.

[0079] In this embodiment, the material of the surrounding wall structure 103 is steel, titanium alloy, aluminum alloy or composite material.

[0080] The manufacturing steps of the second panel 104 include: drilling through holes in the board according to the through hole arrangement form of the sound lining structure in the design drawing; performing surface treatment on the bonding surface of the board and laying a curing adhesive film; after the curing adhesive film is cured, using air flow to blow away the adhesive film in the through holes from the non-bonding surface to prevent the adhesive film from clogging the micropores and affecting the sound silencing ability of the predetermined sound lining structure. In this embodiment, after laying the curing adhesive film on the board, it is placed in a curing device for curing.

[0081] In this embodiment, the second panel 104 is made of steel, titanium alloy, aluminum alloy or composite material.

[0082] Compared with the existing acoustic lining structure, the acoustic element or acoustic lining structure provided in this embodiment has the following beneficial effects: (1) By adjusting the number of through holes or geometric dimensions of the through hole panels in different elements in the acoustic element, efficient sound elimination at at least two resonant frequencies can be achieved. In each element, the Helmholtz cavity has the same geometric dimensions, so that it is presented in pairs, and the sound elimination band at the resonant frequency is widened through the mutual coupling effect. (2) The design of the embedded tube enables the element in the acoustic element or acoustic lining structure to generate a new sound elimination band, and by adjusting the geometric dimensions of the embedded tube, the newly generated sound elimination band is brought closer to the resonant frequency of the Helmholtz cavity, thereby widening the sound elimination bandwidth near the resonant frequency. (3) In the acoustic lining structure composed of different acoustic elements, there is also a weak coherent coupling effect between the acoustic elements, which can further improve and broaden the sound elimination capacity of the entire acoustic lining structure. (4) The acoustic element or acoustic lining structure has a simple structure, a clear manufacturing process, and strong operability. In actual engineering applications, it can be prepared by traditional forming processes or integrated forming by additive manufacturing technology.

[0083] Note that in the description of this specification, the description with reference to the terms "one embodiment", "in other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0084] The above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may also include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for manufacturing a sound lining structure, used for manufacturing a sound lining structure, characterized in that: The acoustic liner structure comprises a first panel, an embedded tube sheet, a surrounding wall structure and a second panel which are sequentially arranged along the thickness direction of the acoustic liner structure; the embedded tube sheet cooperates with the first panel to form a plurality of embedded tubes; the second panel is a through-hole panel; the first panel, the embedded tube sheet, the surrounding wall structure and the second panel cooperate to form a plurality of acoustic elements, the acoustic element having a plurality of Helmholtz cavities arranged side by side, the spaced Helmholtz cavities are connected through an embedded tube to form a primitive, and the other Helmholtz cavities connected through or not through the embedded tube form another primitive; the manufacturing method of the acoustic liner structure comprises the following steps: Manufacturing a first panel, an embedded tube sheet, a surrounding wall structure and a second panel; The formed first panel, the embedded tube sheet, the surrounding wall structure and the second panel are glued and fixed in order from bottom to top.

2. The method for manufacturing the acoustic lining structure according to claim 1, characterized in that: The manufacturing steps of the embedded tube sheet include: according to the arrangement form of the embedded tubes of the acoustic liner structure in the design drawing, the embedded tube sheet is manufactured by a plate punching process, or the embedded tube sheet is manufactured by a resin deposition process; and / or The manufacturing steps of the surrounding wall structure include: selecting a plate material according to the shape and height of the surrounding wall structure of the sound lining structure in the design drawing; bending and cutting the plate material to form a sheet; a pair of the sheets are symmetrical and glued to form a cavity material; a plurality of the cavity materials are glued and fixed in sequence to form the surrounding wall structure; and / or The manufacturing steps of the second panel include: drilling through holes in the plate according to the through hole arrangement of the sound lining structure in the design drawing; surface treating the bonding surface of the plate and laying a curing adhesive film; after the curing adhesive film is cured, using air flow to blow away the adhesive film in the through holes from the non-bonding surface to form the second panel.

3. The method for manufacturing an acoustic lining structure according to claim 1, characterized in that: The material of the first panel is steel, titanium alloy, aluminum alloy or composite material; and / or The material of the embedded tube sheet is aluminum alloy or flexible material or composite material; and / or The material of the wall structure is steel, titanium alloy, aluminum alloy or composite material; and / or The material of the second panel is steel, titanium alloy, aluminum alloy or composite material.

4. A sound lining structure, characterized in that: The acoustic liner structure comprises a first panel, an embedded tube sheet, a surrounding wall structure and a second panel which are sequentially arranged along the thickness direction of the acoustic liner structure; the embedded tube sheet cooperates with the first panel to form a plurality of embedded tubes; the second panel is a through-hole panel; the first panel, the embedded tube sheet, the surrounding wall structure and the second panel cooperate to form a plurality of acoustic elements, the acoustic element having a plurality of Helmholtz cavities arranged side by side, the spaced Helmholtz cavities being connected by an embedded tube to form a unit, and the other Helmholtz cavities being connected by or not by the embedded tube to form another unit.

5. The acoustic lining structure according to claim 4, characterized in that: The surrounding wall structure is a hollow structure with two open ends. The first panel and the embedded tube sheet are sealed and connected to one open end of the surrounding wall structure, and the second panel is sealed and connected to the other open end of the surrounding wall structure.

6. The acoustic lining structure according to claim 4, characterized in that: The acoustic elements in a certain area of ​​the acoustic liner structure are different from each other; or the acoustic elements in a certain area of ​​the acoustic liner structure are the same and different from the acoustic elements in another area.

7. The acoustic lining structure according to claim 4, characterized in that: The cross-sectional shape of the embedded tube is circular, semicircular, elliptical, semi-elliptical, or polygonal.

8. The acoustic lining structure according to claim 4, characterized in that: The cross-sectional shape of the through holes on the through-hole panel is circular, polygonal or elliptical; and / or the cross-sectional shape of the unit of the surrounding wall structure is polygonal or circular.

9. The acoustic lining structure according to any one of claims 4 to 8, characterized in that: The acoustic lining structure is in a flat plate form or a curved form.

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