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

Abstract

An integrated sound-absorbing and insulating honeycomb panel with a built-in resonant cavity, characterized in that it includes an upper panel, a lower panel and a cylindrical honeycomb core in the middle, the cylindrical honeycomb core includes a long honeycomb core and a shortened honeycomb core, and the shortened honeycomb core There is a height difference with the long honeycomb core, so that a cavity is formed between the shortened honeycomb core and the upper and lower panels, and the upper and lower ends of each core cell in the shortened honeycomb core are covered with plate caps. Because tiny holes can be formed between the cylindrical hole honeycomb cores, and there are small holes, by adjusting the height of the honeycomb core, the honeycomb sandwich structure has sound insulation performance at medium and high frequencies, and at the same time has sound absorption performance at medium and low frequencies. The structure of the present invention is simple , without adding or changing too many structures, it can achieve the effect of absorbing and insulating noise in the middle and low frequency bands. And the honeycomb core is partially shortened in the structure. Compared with the honeycomb core structure with constant height, the material is saved, the quality is reduced, and the cost is reduced.

Description

A sound-absorbing and insulating integrated honeycomb panel with a built-in resonant cavity

technical field

The invention relates to a sound-absorbing and insulating plate structure.

Background technique

The honeycomb core of the honeycomb sandwich structure often adopts polygonal shapes, such as regular hexagons, rhombuses and rectangles, etc., and there are also circular hole honeycomb core structures. The honeycomb sandwich panel structure generally has certain sound insulation performance at medium and high frequencies, but the sound insulation effect at low frequencies is poor, and the sound absorption performance needs to be improved.

Contents of the invention

The object of the present invention is to provide a sound-absorbing and insulating integrated honeycomb panel with a built-in resonant cavity, which overcomes the shortcomings of the original honeycomb sandwich panel structure with poor sound-absorbing and insulating effects at low and intermediate frequencies.

An integrated sound-absorbing and insulating honeycomb panel with a built-in resonant cavity, characterized in that it includes an upper panel, a lower panel and a cylindrical honeycomb core in the middle, the cylindrical honeycomb core includes a long honeycomb core and a shortened honeycomb core, and the shortened honeycomb core There is a height difference with the long honeycomb core, so that a cavity is formed between the shortened honeycomb core and the upper and lower panels, and the upper and lower ends of each core cell in the shortened honeycomb core are covered with plate caps.

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, three cells of the shortened honeycomb core form a group to form a shortened honeycomb core group.

Preferably, the position of the shortened honeycomb core group is in the middle of the height of the long honeycomb cores.

Preferably, the connections between the panel and the honeycomb core, between the honeycomb core and the honeycomb core, and between the shortened honeycomb core and the plate cap are all glued connections.

The beneficial effects of the present invention are: due to the small holes can be formed between the cylindrical hole honeycomb cores, there are small holes, by adjusting the height of the honeycomb core, a structure similar to the Helmholtz resonant cavity can be formed, so that the honeycomb sandwich structure has an isolation in the middle and high frequencies. At the same time, it has sound absorption performance in the middle and low frequencies, thereby improving the middle and low frequency noise reduction ability of the honeycomb sandwich panel structure, that is, forming the so-called integrated honeycomb sandwich structure of sound absorption and insulation. The invention has a simple structure, and can achieve the sound absorption and isolation effect on middle and low frequency band noise without adding or changing too many structures. And the honeycomb core is partially shortened in the structure. Compared with the honeycomb core structure with constant height, the material is saved, the quality is reduced, and the cost is reduced.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a structural schematic diagram of shortening the honeycomb core group in the middle position;

Fig. 3 is the comparison diagram of the sound insulation test result of the structure of the present invention and the regular hexagonal sound insulation test structure;

Fig. 4 is a comparison diagram between the sound absorption coefficient test results of the structure of the present invention and the test results of the regular hexagonal honeycomb panel structure and the circular honeycomb panel structure;

Among the figures: 1 upper panel, 2 long honeycomb core, 3 shortened honeycomb core, 4 plate cap, 5 lower panel.

Detailed ways

Now in conjunction with accompanying drawing and embodiment the present invention will be further described:

As shown in Figure 1: a sound-absorbing and insulating integrated honeycomb panel with a built-in resonance cavity, characterized in that it includes an upper panel 1, a lower panel 5, and a cylindrical honeycomb core in the middle, and the cylindrical honeycomb core includes a long honeycomb core 2 and a shortened honeycomb core 3, the shortened honeycomb core 3 is a group of three cells or five cells, and the upper and lower ends of each core cell in the shortened honeycomb core 3 are covered with non-porous thin Round plate cap 4 or micro-perforated plate cap. The material of each part is aluminum alloy, and all of them are glued and connected closely. The total height of the honeycomb panel is 20mm, the thickness of the upper and lower panels is 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 non-porous thin circular plate cap 4 is 0.5mm. The bottom end of the shortened honeycomb core group is glued to the upper panel 1, so that a cavity is formed between the lower panel 5 and the shortened honeycomb core group. The comparison diagram of the sound insulation test results in the structure of this embodiment and the regular hexagonal sound insulation test structure is shown in Figure 3. The results show that the invention of this example can improve the sound insulation of 2-6dB compared with the regular hexagonal honeycomb panel.

Another embodiment: shorten the position of the honeycomb core group in the middle of the height of the entire honeycomb panel, as shown in Figure 2, the total height of the honeycomb is 20mm, the thickness of the upper and lower panels is 0.5mm, the height of the shortened honeycomb core is 5mm, and the cylindrical honeycomb core The diameter is 10 mm, the wall thickness is 1 mm, and the thickness of the non-porous thin circular plate cap 4 is 0.5 mm. A cavity is formed between the upper panel 1 and the shortened honeycomb core group, and a cavity is also formed between the lower panel 5 and the shortened honeycomb core group. This embodiment The test results of the sound absorption coefficient in the structure are compared with the test results of the sound absorption coefficient of the regular hexagonal honeycomb panel structure and the test results of the circular honeycomb panel structure, as shown in Figure 4. The test result shows that the sound absorption effect of the invention in the middle frequency band is very remarkable.

In addition, the selection of structural materials, the height adjustment of the shortened honeycomb, the arrangement of the honeycomb cores, the selection of the height of the shortened honeycomb core, and the selection of the thickness of the circular plate cap can all be determined according to the actual situation. The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, those who make several equivalent substitutions or obvious modifications without departing from the concept of the present invention, and have the same performance or use, shall be deemed to belong to the claims submitted by the present invention defined scope of protection.

Claims (3)

1. An integrated sound-absorbing and insulating honeycomb panel with a built-in resonant cavity, characterized in that it includes an upper panel (1), a lower panel (5) and a cylindrical honeycomb core in the middle, and the cylindrical honeycomb core includes a long honeycomb core (2) and the shortened honeycomb core (3), there is a height difference 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 the shortened honeycomb core (3) The upper and lower ends are covered with plate caps (4); 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; The honeycomb core (3) consists of three sub-units forming a group of shortened honeycomb cores. 2. The sound-absorbing and insulating integrated honeycomb panel with 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-absorbing and insulating integrated honeycomb panel with built-in resonant cavity according to claim 1, characterized in that: between the panel and the honeycomb core, between the honeycomb core and the honeycomb core, the shortened honeycomb core (3) All are glued connection with plate cap (4).

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