A perforated sound-absorbing panel layup structure, prepreg, and prepreg layup method

Abstract

This application belongs to the field of aero-engine design, and is a perforated sound-absorbing panel layering structure, including a transverse layering member and a longitudinal layering member. The transverse layering member and the longitudinal layering member are integrally arranged. The transverse layering member includes a first transverse plate and a first longitudinal plate, and multiple groups of the first transverse plates and the first longitudinal plates form an S-shaped structure. The longitudinal layering member includes a second transverse plate and a second longitudinal plate, and multiple groups of the second transverse plates and the second longitudinal plates form an S-shaped structure. By providing the integrally arranged transverse layering member and the longitudinal layering member, and the transverse layering member and the longitudinal layering member cross each other structurally to form a spatial circuit structure, and a three-dimensional load-bearing structure is formed through the repeated overlapping of the integral body, thereby improving the anti-fatigue performance of the whole and the local parts. In the face of loads in any direction, the transverse layering member and the longitudinal layering member will be stressed simultaneously, so as to disperse the loads to various positions of the sound-absorbing panel. While preventing interlayer delamination, the overall performance is improved, and the load resistance and deformation resistance are greatly improved.

Description

Technical Field

[0001] The present application belongs to the field of aero-engine design, and in particular relates to a perforated silencer plate ply structure, prepreg and a prepreg ply method. Background Art

[0002] Fan noise is the main noise source of high bypass ratio engines. Inlet duct lining, fan front / rear lining and nacelle lining are mainly used to reduce fan noise. Currently, fiber-reinforced composite lining has replaced metal lining. Composite lining mainly consists of perforated muffler, honeycomb and back plate. The muffler is mainly formed by prepreg layering and then compression molding, and is formed by laser or mechanical punching.

[0003] After the traditional resin-based fiber-reinforced prepreg is laid and formed, the shear resistance between layers is weak. The stress conditions of the perforated silencer are very complex. In the heat-flow-vibration environment, in addition to bearing the fan's airflow and fundamental wave and other types of multi-directional excitation loads, it must also meet the impact test of hail, ice flakes, sand and other foreign objects in extreme environments. The composite silencer mainly relies on intact fibers to bear the load, while the fibers at the silencer holes are in a broken state. When the perforation rate of the silencer is between 5% and 15%, the fiber (warp / weft) fracture rate is between 40% and 60%, and the load-bearing structure is affected to a certain extent. When the silencer is subjected to a strong foreign impact, weak separation may occur between the layers, and it is not easy to find during inspection. After a long period of work (thousands of hours), it will cause safety hazards to the engine.

[0004] Therefore, how to improve the strength and integrity of the silencer board is a problem that needs to be solved. Summary of the invention

[0005] The purpose of the present application is to provide a perforated sound-absorbing board ply structure, prepreg and prepreg ply method to solve the problem of easy fracture and weak separation of fiber-reinforced composite sound lining in the prior art.

[0006] The technical solution of this application is: a perforated sound-absorbing plate laying structure, including a transverse laying member and a longitudinal laying member. The transverse laying member and the longitudinal laying member are integrally arranged. There are multiple groups of the transverse laying member and the longitudinal laying member. Multiple groups of transverse strengthening members are connected end to end and multiple groups of transverse strengthening members are arranged along the laying direction. Multiple groups of longitudinal strengthening members are connected end to end and multiple groups of longitudinal strengthening members are arranged along the laying direction. The transverse laying member includes a first transverse plate and a first longitudinal plate. Multiple groups of the first transverse plates and the first longitudinal plates form an S-shaped structure, and the first transverse plates and the first longitudinal plates are cross-connected. The longitudinal laying member includes a second transverse plate and a second longitudinal plate. Multiple groups of the second transverse plates and the second longitudinal plates form an S-shaped structure. The second transverse plates and the second longitudinal plates are cross-connected. Multiple groups of the first transverse plates and the second transverse plates are arranged vertically staggered. The first longitudinal plate is located on the side of the second transverse plate and the first longitudinal plate abuts against the second transverse plate. The second longitudinal plate is located on the side of the first transverse plate and the second longitudinal plate abuts against the first transverse plate. The first transverse plate and the second transverse plate are respectively located at different lateral positions of the first longitudinal plate or the second longitudinal plate.

[0007] Preferably, it further includes sound-absorbing holes opened on the transverse laying member and the longitudinal laying member. The sound-absorbing holes are circular and their outer ring surfaces are all continuous fibers.

[0008] Preferably, both the transverse laying member and the longitudinal laying member are continuous fibers.

[0009] Preferably, the first transverse plate and the second transverse plate are closely attached.

[0010] As a specific implementation manner, a prepreg includes an intermediate body, a transverse body integrally connected to one side of the intermediate body, and a longitudinal body integrally connected to one side of the intermediate body adjacent to the transverse body. The intermediate body, the transverse body and the longitudinal body form an L shape. The transverse body and the longitudinal body are both provided with folding lines that can be folded towards the intermediate body. The transverse body is evenly divided into regions from transverse one to transverse four along its length direction. The transverse one region is adjacent to the intermediate body. The longitudinal body is evenly divided into regions from longitudinal one to longitudinal five along its length direction. The longitudinal one region is adjacent to the intermediate body. There is a folding line between any two adjacent regions.

[0011] As a specific implementation manner, a prepreg laying method is characterized by using the prepreg as described above, including:

[0012] Taking the intermediate body as the laying center area, folding the longitudinal body towards the intermediate body along the folding line between the longitudinal one region and the intermediate body;

[0013] Folding the transverse body towards the longitudinal one region along the folding line between the transverse one region and the intermediate body;

[0014] Fold the longitudinal material onto the first transverse region along the folding line between the second longitudinal region and the first longitudinal region;

[0015] Fold the transverse material onto the second longitudinal region along the folding line between the second transverse region and the first transverse region;

[0016] Fold the longitudinal material onto the second transverse region along the folding line between the third longitudinal region and the second longitudinal region;

[0017] Fold the transverse material onto the third longitudinal region along the folding line between the third transverse region and the second transverse region;

[0018] Fold the longitudinal material onto the third transverse region along the folding line between the fourth longitudinal region and the third longitudinal region;

[0019] Fold the transverse material onto the fourth longitudinal region along the folding line between the fourth transverse region and the third transverse region;

[0020] Fold the longitudinal material onto the fourth transverse region along the folding line between the fifth longitudinal region and the fourth longitudinal region;

[0021] Complete the prepreg layup to form the sound-absorbing panel layup structure.

[0022] A perforated sound-absorbing panel layup structure of the present application includes a transverse layup member and a longitudinal layup member, which are integrally arranged. The transverse layup member includes a first transverse plate and a first longitudinal plate, and multiple groups of the first transverse plates and the first longitudinal plates form an S-shaped structure. The longitudinal layup member includes a second transverse plate and a second longitudinal plate, and multiple groups of the second transverse plates and the second longitudinal plates form an S-shaped structure. By providing the integrally arranged transverse layup member and longitudinal layup member, and the transverse layup member and the longitudinal layup member intersect with each other structurally to form a spatial circuit structure. Compared with the traditional two-dimensional layup structure, a three-dimensional load-bearing structure is formed through the integral repeated overlapping, thereby improving the fatigue resistance of the whole and local parts. In the face of loads in any direction, shrinkage forces will be generated between the layers of the sound-absorbing panel, and the transverse layup member and the longitudinal layup member will be stressed simultaneously, so as to disperse the load to each position of the sound-absorbing panel. While preventing interlayer delamination, the overall performance is improved, and the load resistance and deformation resistance are greatly improved. Since the whole sound-absorbing panel is formed as a whole, the fracture rate is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions provided by the present application, the drawings will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application.

[0024] Figure 1 Schematic diagram of the overall structure of the sound-absorbing panel of the present application;

[0025] Figure 2 Schematic diagram of the transverse AL-AL cross-section structure of the sound-absorbing panel of the present application;

[0026] Figure 3 This is a schematic cross-sectional structure diagram of the longitudinal BL-BL section of the sound insulation board of the present application;

[0027] Figure 4 This is a schematic diagram of the sound insulation board of the present application with a sound insulation hole structure;

[0028] Figure 5 This is a schematic diagram of the prepreg structure of the present application;

[0029] Figure 6 This is a schematic diagram of the prepreg laying process of the present application.

[0030] In the figure: 1. First cross plate; 2. First longitudinal plate; 3. Second cross plate; 4. Second longitudinal plate; 5. Sound insulation hole; 6. Intermediate material body; 7. Transverse material body; 8. Longitudinal material body. Detailed implementation manners

[0031] To make the purpose, technical solutions and advantages of the implementation of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application.

[0032] A perforated sound insulation board laying structure, as Figures 1 - 3 shown, includes a transverse laying member and a longitudinal laying member. The transverse laying member and the longitudinal laying member are integrally provided. There are multiple groups of transverse laying members and longitudinal laying members. Multiple groups of transverse strengthening members are connected end to end and multiple groups of transverse strengthening members are arranged along the laying direction. Multiple groups of longitudinal strengthening members are connected end to end and multiple groups of longitudinal strengthening members are arranged along the laying direction; The transverse laying member includes a first cross plate 1 and a first longitudinal plate 2. Multiple groups of first cross plates 1 and first longitudinal plates 2 form an S-shaped structure, and the first cross plate 1 and the first longitudinal plate 2 are cross-connected. The longitudinal laying member includes a second cross plate 3 and a second longitudinal plate 4. Multiple groups of second cross plates 3 and second longitudinal plates 4 form an S-shaped structure. The second cross plate 3 and the second longitudinal plate 4 are cross-connected. Multiple groups of first cross plates 1 and second cross plates 3 are arranged vertically and alternately. The first longitudinal plate 2 is located on the side of the second cross plate 3 and the first longitudinal plate 2 abuts against the second cross plate 3. The second longitudinal plate 4 is located on the side of the first cross plate 1 and the second longitudinal plate 4 abuts against the first cross plate 1. The first cross plate 1 and the second cross plate 3 are respectively located at different lateral positions of the first longitudinal plate 2 or the second longitudinal plate 4.

[0033] By setting a horizontally laid layer and a vertically laid layer that are integrally arranged, and the horizontally laid layer and the vertically laid layer cross each other structurally to form a spatial circuit structure. Compared with the traditional two-dimensional laid layer structure, a three-dimensional load-bearing structure is formed through the integral repeated overlapping, thereby improving the fatigue resistance of the whole and local parts; in the face of loads in any direction, shrinkage forces will be generated between the layers of the sound insulation board, and the horizontally laid layer and the vertically laid layer will be stressed simultaneously, so as to disperse the load to various positions of the sound insulation board. While preventing interlayer peeling, the overall performance is improved, and the load resistance and deformation resistance are greatly improved. Since the whole sound insulation board is formed as a whole, the fracture rate is greatly reduced.

[0034] Compared with the laminated laid layer structure, the perforation rate of the sound insulation board can be effectively improved.

[0035] Such as Figure 4 As shown, preferably, it further includes sound absorption holes 5 opened on the horizontally laid layer and the vertically laid layer. The sound absorption holes 5 are circular and the outer ring surfaces thereof are all continuous fibers. Both the horizontally laid layer and the vertically laid layer are continuous fibers. In this way, the whole sound insulation board is protected by continuous fibers from top to bottom. At the same time, since the fiber directions of the horizontally laid layer and the vertically laid layer are perpendicular to each other, when subjected to a force in any direction, the horizontal fibers will be protected by the vertical fibers, and the vertical fibers will be protected by the horizontal fibers, which can effectively enhance the strength of the sound insulation board against tension, bending, peeling, etc., and further improve the anti-fracture performance.

[0036] Preferably, the first horizontal plate 1 is closely attached to the second horizontal plate 3, that is, there is no need to fix the laminates through an adhesive structure between the laminates, and only the overlapping structure of the horizontally laid layer and the vertically laid layer is required for fixation, which reduces the process while making the connection between the layers of the sound insulation board closer and more stable.

[0037] As a specific implementation manner, a prepreg, such as Figure 5 As shown, it includes an intermediate body 6, a horizontally arranged body 7 integrally connected to one side of the intermediate body 6, and a vertically arranged body 8 integrally connected to the side of the intermediate body 6 adjacent to the horizontally arranged body 7. The intermediate body 6, the horizontally arranged body 7 and the vertically arranged body 8 form an L shape. Both the horizontally arranged body 7 and the vertically arranged body 8 are provided with fold lines that can be folded towards the intermediate body 6; as Figure 5 As shown, the intermediate body 6 is represented as area A. The horizontally arranged body 7 is evenly divided into horizontal one to horizontal four areas along its length direction. The horizontal one area is adjacent to the intermediate body 6 and is respectively represented as B1, C1, D1, E1, which are continuous fibers in the X direction; the vertically arranged body 8 is evenly divided into vertical one to vertical five areas along its length direction and is respectively represented as B2, C2, D2, E2, F2, which are continuous fibers in the Y direction. The vertical one area is adjacent to the intermediate body 6, and there are fold lines between any two adjacent areas.

[0038] By designing such prepreg, the lateral material body 7 and the longitudinal material body 8 are folded towards the middle material body 6 along the folding lines in sequence to form a three-dimensional load-bearing structure of the sound insulation board, thereby effectively improving the anti-fatigue performance of the whole and local parts.

[0039] As a specific implementation manner, a prepreg laying method is as Figure 5 、 Figure 6 shown. The prepreg described above includes:

[0040] Taking the middle material body 6 as the laying center area, folding the longitudinal material body 8 towards the middle material body 6 along the folding line between the first longitudinal area and the middle material body 6;

[0041] Folding the lateral material body 7 towards the first longitudinal area along the folding line between the first transverse area and the middle material body 6;

[0042] Folding the longitudinal material body 8 towards the first transverse area along the folding line between the second longitudinal area and the first longitudinal area;

[0043] Folding the lateral material body 7 towards the second longitudinal area along the folding line between the second transverse area and the first transverse area;

[0044] Folding the longitudinal material body 8 towards the second transverse area along the folding line between the third longitudinal area and the second longitudinal area;

[0045] Folding the lateral material body 7 towards the third longitudinal area along the folding line between the third transverse area and the second transverse area;

[0046] Folding the longitudinal material body 8 towards the third transverse area along the folding line between the fourth longitudinal area and the third longitudinal area;

[0047] Folding the lateral material body 7 towards the fourth longitudinal area along the folding line between the fourth transverse area and the third transverse area;

[0048] Folding the longitudinal material body 8 towards the fourth transverse area along the folding line between the fifth longitudinal area and the fourth longitudinal area;

[0049] Completing the prepreg laying to form a sound insulation board laying structure.

[0050] By dividing the lateral material body 7 into 4 areas and the longitudinal material body 8 into 5 areas, first folding the longitudinal material body 8 towards the middle material body 6, then folding the lateral material body 7 towards the middle material body 6, and then folding the longitudinal material body 8 towards the middle material body 6 again, and so on, a sound insulation board under a three-dimensional load-bearing structure is formed. The inside of the sound insulation board is an integrally formed space circulation structure, which can bear loads in any direction simultaneously and has high stability.

[0051] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims described above.

Claims

1. A perforated sound-absorbing panel layup structure, characterized in that: It includes a transverse ply member and a longitudinal ply member. The transverse ply member and the longitudinal ply member are integrally provided. There are multiple groups of both the transverse ply member and the longitudinal ply member. Multiple groups of transverse reinforcement members are connected end to end and are arranged along the ply direction. Multiple groups of longitudinal reinforcement members are connected end to end and are arranged along the ply direction. The transverse ply member includes a first transverse plate (1) and a first longitudinal plate (2). Multiple groups of the first transverse plates (1) and the first longitudinal plates (2) form an S-shaped structure, and the first transverse plates (1) and the first longitudinal plates (2) are cross-connected. The longitudinal ply member includes a second transverse plate (3) and a second longitudinal plate (4). Multiple groups of the second transverse plates (3) and the second longitudinal plates (4) form an S-shaped structure, and the second transverse plates (3) and the second longitudinal plates (4) are cross-connected. Multiple groups of the first transverse plates (1) and the second transverse plates (3) are arranged staggered up and down. The first longitudinal plate (2) is located on the side of the second transverse plate (3) and abuts against the second transverse plate (3). The second longitudinal plate (4) is located on the side of the first transverse plate (1) and abuts against the first transverse plate (1). The first transverse plate (1) and the second transverse plate (3) are respectively located at different lateral positions of the first longitudinal plate (2) or the second longitudinal plate (4). It further includes sound-absorbing holes (5) opened on the transverse ply member and the longitudinal ply member. The sound-absorbing holes (5) are circular and the outer ring surfaces thereof are all continuous fibers. Both the transverse ply member and the longitudinal ply member are continuous fibers. The first transverse plate (1) and the second transverse plate (3) are closely attached.

2. A prepreg layup method, characterized in that, It includes: Taking the intermediate material body (6) as the stacking central area, folding the longitudinal material body (8) onto the intermediate material body (6) along the folding line between the first longitudinal area and the intermediate material body (6). Folding the transverse material body (7) onto the first longitudinal area along the folding line between the first transverse area and the intermediate material body (6). Folding the longitudinal material body (8) onto the first transverse area along the folding line between the second longitudinal area and the first longitudinal area. Folding the transverse material body (7) onto the second longitudinal area along the folding line between the second transverse area and the first transverse area. Folding the longitudinal material body (8) onto the second transverse area along the folding line between the third longitudinal area and the second longitudinal area. Folding the transverse material body (7) onto the third longitudinal area along the folding line between the third transverse area and the second transverse area. Folding the longitudinal material body (8) onto the third transverse area along the folding line between the fourth longitudinal area and the third longitudinal area. Folding the transverse material body (7) onto the fourth longitudinal area along the folding line between the fourth transverse area and the third transverse area. Folding the longitudinal material body (8) onto the fourth transverse area along the folding line between the fifth longitudinal area and the fourth longitudinal area. Completing the prepreg layup to form a sound-absorbing board layup structure. The corresponding prepreg includes an intermediate body (6), a transverse body (7) integrally connected to one side of the intermediate body (6), and a longitudinal body (8) integrally connected to one side of the intermediate body (6) adjacent to the transverse body (7). The intermediate body (6), the transverse body (7), and the longitudinal body (8) form an L shape. The transverse body (7) and the longitudinal body (8) are both provided with folding lines that can be folded towards the intermediate body (6). The transverse body (7) is evenly divided into horizontal one to horizontal four regions in sequence along its length direction, and the horizontal one region is adjacent to the intermediate body (6). The longitudinal body (8) is evenly divided into vertical one to vertical five regions in sequence along its length direction, and the vertical one region is adjacent to the intermediate body (6). There is a folding line between any two adjacent regions.

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