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Bidirectional rough parallel arrangement micro-channel porous sound absorption structure

A technology of porous sound absorption and parallel arrangement, which is applied in the direction of sound emitting devices and instruments, and can solve the problems of poor adjustability of sound absorption frequency band, poor sound absorption effect, high sound absorption peak frequency, etc., and achieve excellent sound absorption performance, good Carrying capacity, efficient absorption effect

Pending Publication Date: 2021-09-07
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing porous sound-absorbing materials with micro-channels arranged in parallel generally have a smooth circular hole shape, and there are also unidirectional rough hole shapes, but there are still problems such as poor sound absorption effect, poor adjustability of the sound absorption frequency band, and poor sound absorption. The general disadvantage of high acoustic peak frequency

Method used

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  • Bidirectional rough parallel arrangement micro-channel porous sound absorption structure
  • Bidirectional rough parallel arrangement micro-channel porous sound absorption structure

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Experimental program
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Embodiment

[0051] Examples of materials:

[0052] Structural steel: characterized by a density of 7850kg / m 3 , Young's modulus 200GPa, Poisson's ratio 0.2.

[0053] Air: characterized by a density of 1.29kg / m 3 , sound velocity 343m / s, dynamic viscosity coefficient 1.81×10 -5 Pa·s.

[0054] Structural dimensions and material selection of comparative examples:

Embodiment 1

[0063] The thickness of the plate is 10mm, the porosity of the plate is 30%, the average radius of the bidirectional rough microchannel is 0.4mm, the axial relative roughness of the bidirectional rough microchannel is 0.2, the axial wave number of the bidirectional rough microchannel is 12, and the circumferential direction of the bidirectional rough microchannel is The relative roughness is 0.2, and the circumferential wave number of the bidirectional rough microchannel is 3.

Embodiment 2

[0065] The thickness of the plate is 50mm, the porosity of the plate is 40%, the average radius of the bidirectional rough microchannel is 0.5mm, the axial relative roughness of the bidirectional rough microchannel is 0.1, the axial wave number of the bidirectional rough microchannel is 8, and the circumferential direction of the bidirectional rough microchannel is The relative roughness is 0.1, and the circumferential wave number of the bidirectional rough microchannel is 8.

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Abstract

The invention discloses a bidirectional rough parallel arrangement micro-channel porous sound absorption structure, which is characterized in that a plurality of bidirectional rough micro-channels penetrating through the upper surface and the lower surface of an acoustic rigid framework plate are uniformly distributed in the acoustic rigid framework plate in parallel, the length direction of the bidirectional rough micro-channels is perpendicular to the plate surface of the acoustic rigid framework plate, the lower surface of the acoustic rigid framework plate is fixed to the surface of an object needing acoustic treatment, and a bidirectional rough parallel arrangement micro-channel porous sound absorption structure is formed. According to the invention, the bidirectional rough parallel arrangement micro-channel porous sound absorption structure has excellent sound absorption performance and good bearing capacity, the structure is light, thin and simple, and installation and use are convenient; and more adjustable parameters are provided in the design aspect, corresponding adjustment can be carried out according to the actual use condition, and efficient absorption of specific frequency noise is achieved.

Description

technical field [0001] The invention belongs to the technical field of air sound absorption, and in particular relates to a porous sound-absorbing structure with two-way rough microchannels arranged in parallel. Background technique [0002] Porous sound-absorbing material is a typical sound-absorbing structure that utilizes thermal viscous dissipation mechanism. In practical applications, circular micro-channels arranged in parallel are usually used to form a porous sound-absorbing structure to absorb sound energy, so as to realize the Sound absorption and noise reduction for conference halls, transportation facilities, etc. However, the existing porous sound-absorbing materials with micro-channels arranged in parallel generally have a smooth circular hole shape, and there are also unidirectional rough hole shapes, but there are still problems such as poor sound absorption effect, poor adjustability of the sound absorption frequency band, and poor sound absorption. The gen...

Claims

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Application Information

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IPC IPC(8): G10K11/162
CPCG10K11/162
Inventor 辛锋先张磊
Owner XI AN JIAOTONG UNIV
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