Low-frequency frequency-selecting sound absorption device

Abstract

The invention provides a low-frequency frequency-selecting sound absorption device. The low-frequency frequency-selecting sound absorption device comprises a cover plate, a honeycomb core and a bottom plate, the cover plate and the bottom plate are of cuboid structures with matched sizes, the cover plate and the bottom plate are combined to form a rectangular cavity, the honeycomb core is of a polygonal honeycomb structure, and the honeycomb core is arranged in the rectangular cavity to form a plurality of sound absorption unit resonance cavities. Sound absorption holes with different hole diameters are formed in the resonance cavity of the sound absorption unit, the sound absorption holes are located in the cover plate, and insertion pipes with different lengths are arranged in the sound absorption holes. The sound absorption device is made of all-metal materials and is simple in overall structure, high in strength, easy to produce in batches and long in service life. The range of sound absorption frequency points can be adjusted according to the size of the aperture and the length of the insertion tube, and a good absorption effect on low-frequency noise is achieved.

Description

Technical Field

[0001] The present invention relates to the field of low-frequency sound absorption, in particular to a low-frequency selective sound absorption device. Background Art

[0002] With rising living standards, public awareness of noise pollution is growing, making it a prominent environmental issue. Substations are a crucial component of the power system. Some substations are located within densely populated areas, and the industrial noise generated by their substation equipment severely impacts residents' daily lives. Various noise reduction technologies have been implemented to address these noise-generating equipment, such as fiber and foam-based sound-absorbing materials and metal plate structures. However, their low-frequency sound absorption effectiveness remains limited, making it difficult to meet the substation's actual boundary standards. Therefore, in practical projects, in addition to internal noise reduction measures within the equipment itself, supplementary external noise reduction measures are required, such as soundproofing enclosures, sound barriers, and sound-absorbing panels. However, these measures often rely on traditional sound-absorbing and insulating materials, which must comply with the mass law. This inevitably leads to excessive mass when addressing low-frequency noise. Therefore, the design of lightweight low-frequency sound-absorbing and insulating materials and devices can help address low-frequency noise in urban substations. Summary of the Invention

[0003] The purpose of the present invention is to solve the problem of the current lack of a low-frequency sound absorbing device with a simple structure, light weight, high strength and a selectable sound absorption frequency range.

[0004] The purpose of the present invention is to adopt the following technical solutions to achieve:

[0005] A low-frequency selective sound absorption device, comprising: a cover plate, a honeycomb core, and a bottom plate;

[0006] The cover plate and the bottom plate are rectangular parallelepiped structures with matching sizes, and the cover plate and the bottom plate are combined to form a rectangular cavity;

[0007] The honeycomb core is a polygonal honeycomb structure, and the honeycomb core is placed in the rectangular cavity to form a plurality of sound-absorbing unit resonance cavities.

[0008] Preferably, the resonance cavity of the sound absorbing unit is provided with sound absorbing holes of different diameters, and the sound absorbing holes are located on the cover plate.

[0009] Preferably, insertion tubes of different lengths are provided in the sound absorbing holes, and the diameters of the insertion tubes match the apertures of the sound absorbing holes.

[0010] Preferably, the diameter of the sound absorbing hole is 10 mm or 16 mm, and the length of the insertion tube is 15 to 44 mm.

[0011] Preferably, the sound absorbing unit resonance cavity combination is arranged in the same plane, and different sound absorbing unit resonance cavities are formed according to the different apertures of the sound absorbing holes and the lengths of the insertion tubes. Different sound absorbing unit resonance cavities correspond to different sound absorption frequencies. Sound absorbing holes of different apertures are randomly distributed on the corresponding sound absorbing unit resonance cavities, and insertion tubes of different lengths are randomly distributed in different sound absorbing holes.

[0012] Preferably, the target sound absorption frequencies include but are not limited to: 100 Hz, 200 Hz, and 300 Hz.

[0013] Preferably, the bottom plate, honeycomb core, cover plate and insertion tube of the sound absorbing device are all made of metal aluminum.

[0014] Preferably, the thickness of the sound absorbing device is 70 mm.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The resonance cavities of multiple sound-absorbing units are located in the same plane, and the overall structure has only one layer, which helps to reduce the thickness of the sound-absorbing device;

[0017] Depending on the aperture and length of the insertion tube, it can achieve sound absorption effects on noises of different frequencies, especially good absorption of low-frequency noise (such as 100Hz, 200Hz, 300Hz sounds);

[0018] The resonance cavity of the sound-absorbing unit is a regular polygonal structure, which reduces the complexity of the unit structure and helps to reduce processing difficulty and manufacturing cost;

[0019] The sound-absorbing device is made of metal aluminum, which is lightweight and has good fire resistance and corrosion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the combined structure of a low-frequency selective sound absorbing device provided by the present invention;

[0021] Figure 2 A schematic diagram of the appearance of a low-frequency selective sound absorbing device provided by the present invention;

[0022] Figure 3 A schematic diagram of the internal structure of a low-frequency selective sound absorption device provided by the present invention;

[0023] Figure 4 A side cross-sectional schematic diagram of a low-frequency selective sound absorbing device provided by the present invention;

[0024] Figure 5 A front schematic diagram of a low-frequency selective sound absorbing device provided by the present invention;

[0025] Figure 6This is a schematic diagram of the sound absorption effect of a low-frequency selective sound absorption device provided by the present invention.

[0026] In the figure: 1- bottom plate; 2- honeycomb core; 3- cover plate; 301- sound absorption hole; 302- insertion tube; 303- sound absorption unit resonance cavity; 30- sound absorption unit; 3001- sound absorption unit group A; 3002- sound absorption unit group B. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings.

[0028] like Figures 1 to 4 As shown, the present invention provides a low-frequency selective sound absorbing device, comprising: a cover plate 3, a honeycomb core 2, and a bottom plate 1;

[0029] The cover plate 3 and the bottom plate 1 are rectangular structures with matching sizes. The cover plate 3 and the bottom plate 1 are combined to form a rectangular cavity. The honeycomb core 2 is a polygonal honeycomb structure. The honeycomb core 3 is placed in the rectangular cavity to form multiple sound absorbing unit resonance cavities 303.

[0030] Furthermore, the resonance cavity 303 of the sound absorbing unit is provided with sound absorbing holes 301 with different apertures. The sound absorbing holes 301 are located on the cover plate, and insertion tubes 302 with different lengths are arranged in the sound absorbing holes.

[0031] Furthermore, the diameter of the sound absorption hole 301 is 10 mm or 16 mm, and the length of the insertion tube 302 is 15 to 44 mm, for example, it can be one or more of 15 mm, 30 mm, 40 mm, and 44 mm. Sound absorption holes of different diameters and insertion tubes of different lengths are randomly distributed.

[0032] Furthermore, the bottom plate 1 , the honeycomb core 2 , the cover plate 3 , and the insertion tube 302 are all made of metal aluminum, and the overall thickness of the device is 70 mm.

[0033] Furthermore, the sound absorbing unit resonance cavities 303 are arranged in a same plane. Different sound absorbing unit resonance cavities are formed according to the diameter of the sound absorbing holes 301 and the length of the insertion tube 302. Different sound absorbing unit resonance cavities correspond to different sound absorption frequencies. The sound absorbing holes 301 of different diameters are randomly and disorderly distributed on the corresponding absorption unit resonance cavities 303.

[0034] Furthermore, if Figure 5 As shown, different sound absorbing unit resonance cavities 303 correspond to different sound absorbing units 30, and the sound absorbing units 30 form a plurality of sound absorbing unit groups, for example, sound absorbing unit group A (3001), sound absorbing unit group B (3002), etc. The distribution of the sound absorbing units is not fixed and can be adjusted according to the target sound absorption frequency.

[0035] Furthermore, the sound absorption device was tested by matching different insertion tubes with honeycomb cores of different shapes. Figure 6 The test results show that the sound absorption performance is remarkable at the frequencies of 100Hz, 200Hz, and 300Hz. Specifically, at 100Hz, the sound absorption coefficient reaches 0.7; at 200Hz, the sound absorption coefficient is 0.6; and at 300Hz, the sound absorption coefficient is 0.8.

[0036] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A low-frequency selective sound absorption device, characterized in that: The sound absorbing device comprises: a cover plate, a honeycomb core, and a bottom plate; The cover plate and the bottom plate are rectangular parallelepiped structures with matching sizes, and the cover plate and the bottom plate are combined to form a rectangular cavity; The honeycomb core is a polygonal honeycomb structure, and the honeycomb core is placed in the rectangular cavity to form a plurality of sound-absorbing unit resonance cavities.

2. A low-frequency selective sound absorbing device according to claim 1, characterized in that: The resonance cavity of the sound absorbing unit is provided with sound absorbing holes with different apertures, and the sound absorbing holes are located on the cover plate.

3. A low-frequency selective sound absorbing device as claimed in claim 2, characterized in that: Sound-absorbing holes of different diameters are randomly distributed.

4. A low frequency selective sound absorbing device as claimed in claim 2, characterized in that: Insertion tubes of different lengths are provided in the sound absorbing holes, and the diameters of the insertion tubes match the apertures of the sound absorbing holes.

5. A low-frequency selective sound absorbing device as claimed in claim 4, characterized in that: The length of the insertion tube is smaller than the thickness of the resonance cavity of the sound absorbing unit.

6. A low frequency selective sound absorbing device as claimed in claim 4, characterized in that: Insertion tubes of different lengths are randomly distributed in the sound absorbing holes.

7. The low-frequency selective sound absorbing device according to claim 1, characterized in that: The material of the bottom plate includes metal aluminum.

8. The low-frequency selective sound absorbing device according to claim 1, characterized in that: The material of the honeycomb core includes metal aluminum.

9. The low-frequency selective sound absorbing device according to claim 1, characterized in that: The material of the cover plate includes metal aluminum.

10. The low-frequency selective sound absorbing device according to claim 4, characterized in that: The insertion tube is made of aluminum.

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