Rough folding type sub-wavelength low-frequency sound absorption structure

A sub-wavelength, foldable technology, used in sound-producing instruments, instruments, etc., can solve the problems of inability to large-scale manufacturing, poor low-frequency sound absorption performance, and large structure size.

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

[0004] The technical problem to be solved by the present invention is to provide a rough folded sub-wavelength low-frequency sound-absorbing structure to solve the problems of large

Method used

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  • Rough folding type sub-wavelength low-frequency sound absorption structure
  • Rough folding type sub-wavelength low-frequency sound absorption structure
  • Rough folding type sub-wavelength low-frequency sound absorption structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0052] Examples of materials:

[0053] Structural steel: characterized by a density of 7850kg / m 3 , Young's modulus 200GPa, Poisson's ratio 0.2.

[0054] Air: characterized by a density of 1.21kg / m 3 , the sound velocity is 343m / s, and the dynamic viscosity coefficient is 1.81×10 -5 Pa·s.

Embodiment 1

[0058] The length and width of the cavity section are 39mm×42mm, and the cavity thickness is 54mm. The thickness of the partition is 2mm, the length of the partition is 39mm, and the number of partition plates is 5. The relative roughness of the rough corrugated partition is 0.2, and the roughness wave number of the rough corrugated partition is 2π.

Embodiment 2

[0060] The length and width of the cavity section are 49mm×42mm, and the cavity thickness is 54mm. The thickness of the partition is 2mm, the length of the partition is 39mm, and the number of partition plates is 6. The relative roughness of the rough corrugated partition is 0.2, and the roughness wave number of the rough corrugated partition is 2π.

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Abstract

The invention discloses a rough folding type sub-wavelength low-frequency sound absorption structure, which is characterized in that a plurality of rough corrugated partition plates are arranged in a cavity to form a Helmholtz resonant cavity, and form an S-shaped neck micro-channel in the Helmholtz resonant cavity. The rough folding type sub-wavelength low-frequency sound absorption structure is excellent in low-frequency sound absorption performance, good in sound absorption performance adjustability and bearing performance, simple in structure, and convenient for large-scale machining and manufacturing.

Description

technical field [0001] The invention belongs to the technical field of noise control, in particular to a rough folded sub-wavelength low-frequency sound-absorbing structure. Background technique [0002] With the continuous development of industrial technology, noise pollution is becoming more and more serious, how to reduce noise has become a widespread concern in many fields. Porous materials such as aluminum foam materials, sintered fiber materials, and ceramic fiber materials are widely used in engineering and life due to their good sound absorption properties. The sound absorption mechanism of porous materials is to use the viscous loss and heat conduction of the air and the inner wall of the material pores, and its material characteristics make it have good sound absorption performance for medium and high frequency noise. But it is also the limitation of the structure size of the material itself, which leads to the insufficient performance of porous materials in absor...

Claims

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Application Information

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IPC IPC(8): G10K11/162G10K11/172
CPCG10K11/162G10K11/172
Inventor 辛锋先刘懋霖
Owner XI AN JIAOTONG UNIV
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