A test tool for testing the sound insulation performance of sound and heat insulating glass fiber cotton

Abstract

The present invention discloses a test tool for testing the sound insulation performance of sound-insulating and heat-insulating glass fiber cotton, which includes a fixed frame. The outer side of the fixed frame is connected to the walls of an anechoic chamber and a reverberation chamber. A communication channel is provided in the middle of the fixed frame, and the communication channel connects the anechoic chamber and the reverberation chamber. A movable plate is embedded at the port near the reverberation chamber end in the communication channel, and the movable plate is fixed to the fixed frame through quick clamps; the movable plate sequentially includes a sealing member, a first aluminum plate layer, a first lamination frame, a first wire mesh, a sample layer, a second wire mesh, a second lamination frame, and a second aluminum plate layer. The sealing member is close to the reverberation chamber side, and the second aluminum plate layer is close to the anechoic chamber side. The present invention can simulate the actual sound insulation performance of glass fiber cotton used for sound insulation and heat insulation, and at the same time can reduce the influence of lateral sound transmission of traditional components on the test results, which is close to the actual use situation, and the test data can better reflect the actual effect.

Description

Technical Field

[0001] The present invention relates to the technical field of acoustic testing, and particularly relates to a testing tool for testing the sound insulation performance of sound insulation and heat insulation glass fiber cotton. Background Art

[0002] In order to improve the comfort of taking an airplane, the airplane cabin wall panels are usually sound-insulated and heat-insulated, and the glass fiber cotton for sound insulation and heat insulation plays a major role in the airplane cabin wall panels.

[0003] The sound insulation quantity is an important index for measuring the sound insulation performance of acoustic materials, and the sound insulation performance of acoustic materials improves with the increase of the sound insulation quantity of the materials. The reverberation room-reverberation room method, the reverberation room-anechoic chamber method and the standing wave tube method are the main methods for measuring the sound insulation quantity of materials. In China, the reverberation room-reverberation room method and the standing wave tube method are generally adopted. The standing wave tube method mainly adopts the four-microphone method, but the sample size is small, and the test data cannot truly reflect the sound insulation performance of the material during application, and can only simply express the material performance. The reverberation room-reverberation room method is to test the sound insulation performance of materials with reference to the standard of ASTM E90, and the sound pressure method is adopted for testing, which can more truly reflect the sound insulation effect of the material during application. The reverberation room-anechoic chamber method is detected with reference to the standard of ASTM E2249, and the sound intensity method is adopted for testing. Because the cost of the anechoic chamber in this method is high and there are high requirements for sample preparation, there is no precedent for using this method for detection in China, but this method is crucial for evaluating the acoustic performance of aviation-grade sound insulation and heat insulation materials.

[0004] The sound insulation and heat insulation glass fiber cotton applied in the airplane cabin wall panel is light and soft. At present, the traditional testing tooling cannot simulate the actual situation of the airplane cabin wall panel to perform good sound insulation testing on the sound insulation and heat insulation glass fiber cotton applied in the airplane cabin wall panel, and the accuracy of its test results is poor. Therefore, the testing tooling needs to be improved. Summary of the Invention

[0005] In view of the existing technical problems, the present invention provides a testing tool for testing the sound insulation performance of sound insulation and heat insulation glass fiber cotton to solve the problems in the prior art.

[0006] In order to achieve the above invention purpose, the present invention provides the following technical solutions:

[0007] A testing tool for testing the sound insulation performance of sound insulation and heat insulation glass fiber cotton includes a fixed frame, the outer side of the fixed frame is connected to the anechoic chamber wall and the reverberation chamber wall, a communication channel is provided in the middle of the fixed frame, the communication channel connects the anechoic chamber and the reverberation chamber, a moving plate is embedded at the port near the reverberation chamber end in the communication channel, and the moving plate is fixed to the fixed frame through a quick clamp.

[0008] The movable plate sequentially includes a seal, a first aluminum plate layer, a first lamination frame, a first wire mesh, a sample layer, a second wire mesh, a second lamination frame, and a second aluminum plate layer. The seal is closer to the reverberation chamber side, and the second aluminum plate layer is closer to the anechoic chamber side.

[0009] Preferably, the communication channel is in the shape of a flared trumpet, and its opening closer to the reverberation chamber side is smaller than the opening closer to the anechoic chamber side.

[0010] Preferably, a rubber pad is provided at the position where the movable plate contacts the fixed frame.

[0011] Preferably, the inside of the fixed frame is filled with a sound-absorbing material, and the sound absorption coefficient of this sound-absorbing material is ≥0.85, and the density is ≤7.5 g / cm3.

[0012] Preferably, a partition plate is provided inside the fixed frame to divide the inside of the fixed frame into different areas. Each area is filled with a sound-insulating material, and the different areas are soft-connected with a sound-insulating material.

[0013] Preferably, the surface of the fixed frame is covered with a metal plate, and perforations are distributed on the metal plate. The thickness of the metal plate is 1 mm to 4 mm.

[0014] Preferably, the material of the metal plate is one or a combination of several of aluminum, steel, aluminum alloy, stainless steel, and zinc.

[0015] Preferably, a handle is provided on the fixed frame.

[0016] Preferably, the thickness range of the sample layer is 19.3 mm - 63.5 mm.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention can simulate the actual sound insulation performance of fiberglass wool used for sound insulation and heat insulation. At the same time, it can reduce the influence of lateral sound transmission of traditional components on the test results, which is close to the actual use situation, and the test data can better reflect the actual effect. The structure is simple and the use effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the front view of the present invention;

[0019] Figure 2 is Figure 1 the rear view in

[0020] Figure 3 is Figure 1 the internal sectional view of

[0021] Figure 4 is Figure 3 the partial schematic view of DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present invention will be further described in detail below in combination with test examples and specific embodiments. However, it should not be understood that the scope of the above-mentioned subject matter of the present invention is limited to the following embodiments. All technologies implemented based on the content of the present invention belong to the scope of the present invention.

[0023] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0024] As shown in the attached Figure 1 - attached Figure 4 A test tool for testing the sound insulation performance of sound insulation and heat insulation glass fiber cotton, including a fixed frame 1. The outside of the fixed frame 1 is connected to the anechoic chamber wall 5 and the reverberation chamber wall 4, specifically by expansion bolts. The gaps at the connections can be filled with plastic cotton. Sound-absorbing materials are also filled at positions near the fixed frame between the anechoic chamber wall 5 and the reverberation chamber wall 4. A communication channel 8 is provided in the middle of the fixed frame 1. The communication channel 8 connects the anechoic chamber and the reverberation chamber. The communication channel 8 is in the shape of a flared trumpet. The opening on the side close to the reverberation chamber is smaller than the opening on the side close to the anechoic chamber. The size of the opening of the communication channel 8 on the side close to the reverberation chamber is 1.6m × 1.6m, and the size of the opening on the side close to the anechoic chamber is 1.97m × 1.967m.

[0025] The inside of the fixed frame 1 is filled with sound-absorbing materials. The sound absorption coefficient of the sound-absorbing materials is ≥0.85, and the density is ≤7.5g / cm3. Separator plates can also be provided in the fixed frame to divide the inside of the fixed frame into different areas. Each area is filled with sound insulation materials. The sound insulation materials can be one kind or several kinds. The different areas are connected by soft sound insulation materials. A metal plate 12 is covered on the surface of the fixed frame 1. Through holes 11 are distributed on the metal plate 12. The through holes 11 are located on the surface of the communication channel 8. The sound-absorbing materials can absorb the incident sound waves from the outside through the through holes. The thickness of the metal plate 12 is 1mm - 4mm. The material of the metal plate 12 can be one or a combination of several of aluminum, steel, aluminum alloy, stainless steel, and zinc. A handle 9 is provided on the fixed frame 1.

[0026] A movable plate 2 is embedded at the port near the reverberation chamber end in the communication channel 8. The movable plate 2 is fixed to the fixed frame 1 through a quick clamp 7. Rubber pads 6 are provided at the positions where the movable plate 2 contacts the fixed frame 1.

[0027] In this embodiment, the moving plate 2 successively includes a seal 21, a first aluminum plate layer 22, a first lamination frame 23, a first wire mesh 24, a sample layer 25, a second wire mesh 26, a second lamination frame 27, and a second aluminum plate layer 28. The seal 21 is close to the reverberation chamber side, and the second aluminum plate layer 28 is close to the anechoic chamber side. The seal 21 is a neoprene rubber seal with an outer edge size of 1.83 m × 1.83 m and a thickness of 25 mm; the first aluminum plate layer 22 has a size of 1.74 m × 1.74 m and a thickness of 1.02 mm, and is embedded in the neoprene rubber layer for restraint; the first lamination frame 23 has an outer edge size of 1.64 m × 1.64 m, a thickness of 25 mm, and a frame width of 51 mm, and its material is cork; the first wire mesh 24 is a hexagonal wire mesh with a size of 1.6 m × 1.6 m; the sample layer 25 is a placement layer for sound-insulating and heat-insulating glass fiber cotton, and the thickness variation range is 19.3 mm - 63.5 mm; the second wire mesh 26 is a hexagonal wire mesh with an outer dimension of 1.6 m × 1.6 m, and is stretched and abutted against the second lamination frame 27; the second lamination frame 27 has an outer edge size of 1.64 m × 1.64 m, a thickness of 25 mm, and a frame width of 51 mm, and its material is cork; the second aluminum plate layer 28 has a size of 1.6 m × 1.6 m and a thickness of 1.02 mm, and is screwed to the second lamination frame 27 with wooden bolts.

[0028] The multi-layer design of the moving plate and the flared communication channels can simulate the actual situation of the glass fiber cotton material for sound insulation and heat insulation in the aircraft cabin wall panel, so that the test results are more in line with the actual situation.

[0029] The preferred specific embodiments of the present invention have been described above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention through logical analysis, reasoning, or limited experiments based on the concept of the present invention on the basis of the prior art should fall within the protection scope determined by the claims.

Claims

1. A test tool for testing the sound insulation performance of sound insulation and heat insulation glass fiber cotton, characterized in that: It includes a fixed frame (1), the outer side of the fixed frame (1) is connected to the anechoic chamber wall (5) and the reverberation chamber wall (4), a communication channel (8) is provided in the middle of the fixed frame (1), the communication channel (8) connects the anechoic chamber and the reverberation chamber, and a movable plate (2) is embedded at the port near the reverberation chamber end in the communication channel (8), and the movable plate (2) is fixed to the fixed frame (1) through a quick clamp (7); The movable plate (2) successively includes a seal (21), a first aluminum plate layer (22), a first lamination frame (23), a first wire mesh (24), a sample layer (25), a second wire mesh (26), a second lamination frame (27) and a second aluminum plate layer (28), the seal (21) is on the side close to the reverberation chamber, and the second aluminum plate layer (28) is on the side close to the anechoic chamber; the first aluminum plate layer (22) and the first wire mesh (24) are separated by the first lamination frame (23), and the second wire mesh (26) and the second aluminum plate layer (28) are separated by the second lamination frame (27); The inside of the fixed frame (1) is filled with sound-absorbing material, and the surface of the fixed frame (1) is covered with a metal plate (12), and perforations (11) are distributed on the metal plate (12).

2. The test tooling for testing the sound insulation performance of sound insulation and heat insulation fiberglass cotton according to claim 1, wherein: The communication channel (8) is in a flared shape, and the opening on the side close to the reverberation chamber is smaller than the opening on the side close to the anechoic chamber.

3. The test tool for testing the sound insulation performance of sound insulation and heat insulation fiberglass cotton according to claim 2, characterized in that: A rubber pad (6) is provided at the position where the movable plate (2) contacts the fixed frame (1).

4. The test tooling for testing the sound insulation performance of sound insulation and heat insulation fiberglass wool according to claim 1, wherein: The sound absorption coefficient of the sound-absorbing material is ≥0.85, and the density is ≤7.5 g / cm3.

5. The test tooling for testing the sound insulation performance of sound insulation and heat insulation fiberglass wool according to claim 4, characterized in that: Partition plates are provided in the fixed frame (1) to divide the inside of the fixed frame into different areas, each area is filled with sound-insulating material, and the different areas are softly connected with sound-insulating material.

6. The test tooling for testing the sound insulation performance of sound insulation and heat insulation fiberglass cotton according to claim 1, characterized in that: The thickness of the metal plate (12) is 1 mm to 4 mm.

7. The test tooling for testing the sound insulation performance of sound insulation and heat insulation glass fiber cotton according to claim 6, characterized in that: The material of the metal plate (12) is one or a combination of several of aluminum, steel, aluminum alloy, stainless steel, and zinc.

8. The test tool for testing the sound insulation performance of sound insulation and heat insulation fiberglass wool according to claim 1, wherein: A handle (9) is provided on the fixed frame (1).

9. The test tooling for testing the sound insulation performance of sound insulation and heat insulation fiberglass wool according to claim 1, characterized in that: The thickness range of the sample layer (25) is 19.3 mm - 63.5 mm.

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