Ultrathin sound absorption structure capable of sound absorption in wide low-frequency range

A sound-absorbing, ultra-thin technology, applied in the field of acoustics, can solve problems such as limiting engineering applications, single fixed frequency, limiting practical applications, etc., and achieve the effect of widening the bandwidth of the sound-absorbing frequency band

Inactive Publication Date: 2017-09-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the sound-absorbing structures designed by the first two methods can only improve the low-frequency sound-absorbing performance to a certain extent.
Although the third type of method can achieve good low-frequency sound absorption performance, it can only be realized at a single fixed frequency, and it needs a larger size to achieve wide and low-frequency sound absorption, which limits the application of this type of structure to a certain extent.
Although the fourth type of method can also achieve good low-frequency sound absorption performance, the thickness of the material is required to match the sound absorption wavelength, that is, the thickness is too thick, which limits the actual engineering application of this type of structure
However, the low-frequency sound absorption of its designed structure is a single frequency, which limits its practical application
[0010] Therefore, so far, there is still no structure that can achieve a sound-absorbing structure that has a wide frequency band and good sound-absorbing performance in the low-frequency domain while the material thickness is very thin.

Method used

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  • Ultrathin sound absorption structure capable of sound absorption in wide low-frequency range
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  • Ultrathin sound absorption structure capable of sound absorption in wide low-frequency range

Examples

Experimental program
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Effect test

example 1

[0071] Example 1: The middle layer is processed with coiled solenoids of different sizes for serial distribution

[0072] The materials used in the front panel 1, the middle layer 2 and the rigid back panel 3 are all PLA. PLA is a commonly used 3D printing material, and its tensile strength and flexural modulus are both greater than 60Mpa, meeting the rigidity requirements of ultra-thin sound-absorbing structures;

[0073] See attached Figure 5-6 , The side length D of the front panel 1, the middle layer 2 and the rigid back panel 3 are all 100mm, and the total thickness h is 23.3mm;

[0074] Wherein, the thickness of the front panel 1 is 1mm; the geometric center of the front panel 1 is provided with a square through hole, the side length of the square through hole is 21.3mm, and the geometric center of the square through hole coincides with the geometric center of the front panel 1 ;

[0075] The thickness of the middle layer 2 is 21.3mm; the middle layer 2 is processed with a squa...

example 2

[0079] Example 2: The middle layer is processed with coiled solenoids of different sizes for serial distribution

[0080] The materials used in the front panel 1, the middle layer 2 and the rigid back panel 3 are all metal aluminum. The elastic modulus of aluminum is 69Gpa, which meets the requirements of sound-absorbing structures for rigid walls;

[0081] See attached Figure 8-9 , The side length D of the front panel 1, the middle layer 2 and the rigid back panel 3 are all 108.4mm, and the total thickness h is 6.5mm;

[0082] Wherein, the thickness of the front panel 1 is 0.1mm; the front panel 1 is processed with a 53mm*6mm rectangular through hole at a position 0.2mm away from two adjacent right-angle sides;

[0083] The thickness of the middle layer 2 is 6mm; the middle layer 2 is processed with a rectangular through hole with the same position and size as the rectangular through hole of the front panel 1; the long side of the rectangular through hole is the starting point (that...

example 3

[0087] Example 3: The middle layer is processed with coiled solenoids of different sizes for mixed-connection distribution

[0088] The materials used in the front panel 1, the middle layer 2 and the rigid back panel 3 are all metal aluminum. The elastic modulus of aluminum is 69Gpa, which meets the requirements of sound-absorbing structures for rigid walls;

[0089] See attached Figure 11-12 , The side length D of the front panel 1, the middle layer 2 and the rigid back panel 3 are all 100mm, and the total thickness h is 30.4mm;

[0090] Wherein, the thickness of the front panel 1 is 0.2mm; the front panel 1 is processed with two diagonal square through-holes, the two square through-holes are respectively closest to two adjacent right-angled sides at a distance of 2mm. The side lengths of each square through hole are 30mm and 26mm respectively;

[0091] The thickness of the middle layer 2 is 6mm; the middle layer 2 is processed with two square through holes with the same position ...

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Abstract

The invention discloses an ultrathin sound absorption structure capable of sound absorption in a wide low-frequency range, and belongs to the field of acoustic technologies. The structure is formed by arranging identical square cells uniformly, and each square cell is formed by fixing and connecting a front panel, an intermediate layer and a rigid backboard sequentially; through holes are processed in the front panels respectively; each intermediate layer is provided with a through hole the same with the through hole of the front panel and a large-caliber coiled solenoid and a small-caliber coiled solenoid which are coiled by taking the through hole as a start point; and the large-caliber the small-caliber coiled solenoids are distributed via serial connection, parallel connection or serial and parallel mixed connection. According to the invention, the coiled solenoids of different sizes are processed in the intermediate layers and distributed via serial connection, parallel connection or serial and parallel mixed connection, and the sound absorption structure is characterized by being ultrathin and enabling well sound absorption in the wide low-frequency range.

Description

Technical field [0001] The invention belongs to the technical field of acoustics, and specifically relates to an ultra-thin sound-absorbing structure with wide and low frequency sound absorption. Background technique [0002] Noise refers to the sound made when the sounding body vibrates irregularly, which will seriously hinder people's normal rest, study and life. On the one hand, noise pollution mainly comes from transportation, construction, industrial noise, social noise, household noise, etc. Therefore, noise reduction is particularly important for people's comfort in life not to be affected by noise. On the other hand, in the field of military applications, reducing the strong noise of a spacecraft during takeoff can reduce its damage to sensitive components; reducing the measurability of nuclear submarine engine noise is one of the key technologies to improve the survivability of nuclear submarines. [0003] However, low-frequency sound absorption and noise reduction has al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/16G10K11/162
CPCG10K11/16G10K11/162
Inventor 胡更开陈昌儒杜智博
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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