CN107415335B

CN107415335B - Sound absorption and insulation integrated honeycomb plate with built-in resonant cavity

Info

Publication number: CN107415335B
Application number: CN201710301394.8A
Authority: CN
Inventors: 吴锦武; 李志宽
Original assignee: Nanchang Hangkong University
Current assignee: Nanchang Hangkong University
Priority date: 2017-05-02
Filing date: 2017-05-02
Publication date: 2023-03-21
Anticipated expiration: 2037-05-02
Also published as: CN107415335A

Abstract

The utility model provides a sound absorption and insulation integrated honeycomb panel of built-in resonant cavity which characterized in that: cylindrical honeycomb core including top panel, lower panel and centre, cylindrical honeycomb core includes long honeycomb core and shortens the honeycomb core, shortens to have the difference in height between honeycomb core and the long honeycomb core for shorten the honeycomb core and form the cavity between the top panel and the bottom panel, shorten the upper and lower both ends of each core cell element in the honeycomb core and all covered with the slab cap. Because the micro holes can be formed between the cylindrical hole honeycomb cores and the small holes exist, the honeycomb sandwich structure has sound insulation performance at medium and high frequencies and sound absorption performance at medium and low frequencies by adjusting the height of the honeycomb core. And compared with a honeycomb core structure with the same height, the honeycomb core structure has the advantages of saving materials, lightening the weight and reducing the cost.

Description

Sound absorption and insulation integrated honeycomb plate with built-in resonant cavity

Technical Field

The invention relates to a sound absorption and insulation plate structure.

Background

The honeycomb sandwich of the honeycomb sandwich structure usually adopts polygons, such as regular hexagons, rhombuses, rectangles and the like, and also has a round hole honeycomb core structure. The honeycomb sandwich plate structure generally has certain sound insulation performance at medium and high frequencies, but the low-frequency sound insulation effect is poor, and the sound absorption performance needs to be improved.

Disclosure of Invention

The invention aims to provide a sound absorption and insulation integrated honeycomb plate with a built-in resonant cavity, which overcomes the defect of poor sound absorption and insulation effect of the original honeycomb sandwich plate structure at low and medium frequency.

The utility model provides a sound absorption and insulation integrated honeycomb panel of built-in resonant cavity which characterized in that: cylindrical honeycomb core including top panel, lower panel and centre, cylindrical honeycomb core includes long honeycomb core and shortens the honeycomb core, shortens to have the difference in height between honeycomb core and the long honeycomb core for shorten the honeycomb core and form the cavity between the top panel and the bottom panel, shorten the upper and lower both ends of each core cell element in the honeycomb core and all covered with the slab cap.

Preferably, the cylindrical honeycomb cores are closely arranged.

Preferably, the ratio of the shortened honeycomb core height to the long honeycomb core height is 1:4.

Preferably, the shortened honeycomb core cells are grouped into three groups to form a group of shortened honeycomb cores.

Preferably, the position of the shortened set of honeycomb cores is at the middle of the height of the long honeycomb core.

Preferably, the panel and the honeycomb core, the honeycomb core and the shortened honeycomb core and the plate cap are all connected by gluing.

The beneficial effects of the invention are: as the micropores can be formed among the cylindrical hole honeycomb cores and exist, the honeycomb sandwich structure can be similar to a Helmholtz resonant cavity structure by adjusting the height of the honeycomb core, so that the honeycomb sandwich structure has sound insulation performance at medium and high frequencies and sound absorption performance at medium and low frequencies, thereby improving the medium and low frequency noise reduction capability of the honeycomb sandwich structure, namely forming the so-called sound absorption and insulation integrated honeycomb sandwich structure. The invention has simple structure, and can achieve the sound absorption and insulation effect of the middle-low frequency band noise without increasing or changing too many structures. And compared with a honeycomb core structure with the same height, the honeycomb core structure has the advantages of saving materials, lightening the weight and reducing the cost.

Drawings

FIG. 1 is a schematic structural view of the present invention;

figure 2 is a schematic view of the construction of the shortened set of honeycomb cores in an intermediate position;

FIG. 3 is a graph comparing the sound insulation test results of the inventive structure with the regular hexagonal sound insulation test structure;

FIG. 4 is a graph comparing the results of the sound absorption coefficient test of the inventive structure with the results of the test of the regular hexagonal honeycomb panel structure and the circular honeycomb panel structure;

in the figure, 1 is an upper panel, 2 is a long honeycomb core, 3 is a shortened honeycomb core, 4 is a plate cap, and 5 is a lower panel.

Detailed Description

The invention will now be further illustrated with reference to the accompanying drawings and examples:

as shown in fig. 1: the utility model provides a sound absorption and insulation integrated honeycomb panel of built-in resonant cavity which characterized in that: including upper panel 1, lower panel 5 and middle cylindrical honeycomb core, cylindrical honeycomb core includes long honeycomb core 2 and shortens honeycomb core 3, it uses three cell element or five cell elements as a set of to shorten honeycomb core 3, shorten the upper and lower both ends of each core cell element in honeycomb core 3 and all be covered with the thin circular plate cap 4 of sclausura or the board cap of micro-perforation. All parts are made of aluminum alloy materials and are tightly arranged in a gluing connection mode. The total height of the honeycomb plate is 20mm, the thicknesses of the upper panel and the lower panel are 0.5mm, the height of the shortened honeycomb core 3 is 5mm, the diameter of the cylindrical honeycomb core is 10mm, and the wall thickness is 1mm. The thickness of the imperforate thin circular cap 4 is 0.5mm. The bottom end of the shortened honeycomb core group is glued with the upper panel 1, so that a cavity is formed between the lower panel 5 and the shortened honeycomb core group. The comparison between the sound insulation test result of the structure of the embodiment and the regular hexagon sound insulation test structure is shown in fig. 3. The result shows that compared with the regular hexagon honeycomb plate, the sound insulation quantity of the invention can be improved by 2-6 dB.

In another embodiment: shorten the position of honeycomb core group in the intermediate position of whole honeycomb panel height, as shown in fig. 2, honeycomb overall height is 20mm, upper and lower panel thickness is 0.5mm, it is 5mm to shorten the honeycomb core height, cylindrical honeycomb core diameter is 10mm, wall thickness 1mm, 4 thickness of the thin circular plate cap of sclausura are 0.5mm, upper panel 1 and shorten the honeycomb core inter-group vacuole formation, panel 5 also vacuole formation with shortening the honeycomb core inter-group below, compare between the acoustic absorption coefficient test result in the structure of this embodiment and regular hexagon honeycomb panel structure acoustic absorption coefficient test result and circular honeycomb panel structure test result, as shown in fig. 4. Test results show that the sound absorption effect of the sound absorption device in the middle frequency band is very obvious.

In addition, the structural material is selected, the height of the honeycomb is shortened, the honeycomb cores are arranged in an arrangement mode, the height of the honeycomb cores is shortened, and the thickness of the circular plate cap can be selected according to actual conditions. The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several equivalent substitutions or obvious modifications, which are equivalent in performance or use, without departing from the inventive concept, should be considered to fall within the scope of protection determined by the claims as filed.

Claims

1. The utility model provides a sound absorption and insulation integrated honeycomb panel of built-in resonant cavity which characterized in that: the honeycomb core structure comprises an upper panel (1), a lower panel (5) and a cylindrical honeycomb core in the middle, wherein the cylindrical honeycomb core comprises a long honeycomb core (2) and a shortened honeycomb core (3), a height difference exists between the shortened honeycomb core (3) and the long honeycomb core (2), so that a cavity is formed between the shortened honeycomb core (3) and the upper and lower panels, and plate caps (4) are respectively covered at the upper end and the lower end of the shortened honeycomb core (3); the cylindrical honeycomb cores are closely arranged; the ratio of the height of the shortened honeycomb core (3) to the height of the long honeycomb core (2) is 1:4; three subcells of the shortened honeycomb core (3) form a group to form a shortened honeycomb core group.

2. The sound absorption and insulation integrated honeycomb panel with a built-in resonant cavity according to claim 1, characterized in that: the position of the shortened honeycomb core group (3) is in the middle of the height of the long honeycomb core (2).

3. The sound absorption and insulation integrated honeycomb panel with a built-in resonant cavity according to claim 1, characterized in that: the panel and the honeycomb core, the honeycomb core and the honeycomb core, and the shortened honeycomb core (3) and the plate cap (4) are connected by gluing.