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Rough inner inserting pipe type Helmholtz resonance sound absorption structure

A resonant sound-absorbing and intubation-type technology, which is applied in the direction of sound-generating devices and instruments, can solve problems such as poor low-frequency sound-absorbing performance, poor lightweight performance, and difficult processing and manufacturing, and achieve excellent low-frequency sound-absorbing performance and superior The effect of performance adjustability, good load carrying capacity and lightweight performance

Active Publication Date: 2020-09-22
XI AN JIAOTONG UNIV +1
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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 inner tube-type Helmholtz resonance sound-absorbing structure to solve the above-mentioned deficiencies in the prior art Traditional air sound-absorbing structures generally have narrow bandwidth, poor low-frequency sound-absorbing performance, difficult processing and manufacturing, large size, and poor lightweight performance.

Method used

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  • Rough inner inserting pipe type Helmholtz resonance sound absorption structure
  • Rough inner inserting pipe type Helmholtz resonance sound absorption structure
  • Rough inner inserting pipe type Helmholtz resonance sound absorption structure

Examples

Experimental program
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Effect test

Embodiment

[0045] Examples of materials:

[0046] Structural steel: characterized by a density of 7850kg / m 3 , Young's modulus 200GPa, Poisson's ratio 0.2.

[0047] Air: characterized by a density of 1.29kg / m 3 , sound velocity 343m / s, dynamic viscosity coefficient 1.81×10 -5 Pa·s.

[0048] Structural dimensions and material selection of comparative examples:

Embodiment 1

[0053] The diameter of the cavity is 20mm, the height of the cavity is 30mm, the diameter of the rough inner tube is 3mm, the relative roughness of the rough inner tube is 0.15, the spatial wave number of the rough inner tube is 0.96π, and the length of the rough inner tube is 25mm.

Embodiment 2

[0055] The diameter of the cavity is 25mm, the height of the cavity is 40mm, the diameter of the rough inner tube is 4mm, the relative roughness of the rough inner tube is 0.2, the spatial wave number of the rough inner tube is 1.6π, and the length of the rough inner tube is 30mm.

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Abstract

The invention discloses a rough inner inserting pipe type Helmholtz resonance sound absorption structure;, a hole is formed in the center of one end of a cavity, a rough inner inserting pipe is arranged in the hole, and the rough inner inserting pipe and the cavity are connected in a welding or gluing mode to form the rough inner inserting pipe type Helmholtz resonance sound absorption structure.The rough inner inserting pipe type Helmholtz resonance sound absorption structure has excellent low-frequency sound-absorbing performance and good bearing performance and light weight performance. And more adjustable structural parameters are provided in the design aspect, corresponding adjustment can be conducted according to actual working condition requirements, the structure is simple, and manufacturing is easy.

Description

technical field [0001] The invention belongs to the technical field of air sound absorption, and in particular relates to a rough inner tube type Helmholtz resonance sound absorption structure. Background technique [0002] The Helmholtz resonant cavity is a typical resonant sound-absorbing structure. In practical applications, the Helmholtz resonant structure is usually constructed by using a micro-perforated plate and a back cavity, and absorbs sound waves in the air through Helmholtz resonance. , so as to realize the vibration and noise reduction design in theaters, meeting rooms and car cabins. [0003] However, for the micro-perforated plate structure, in order to achieve efficient absorption of lower-frequency sound waves, it is necessary to increase the thickness of the micro-perforated plate and reduce the aperture of the micro-perforated plate, which will increase the quality and volume of the structure, which is not conducive to Lightweight design and fabrication....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172G10K11/162
CPCG10K11/172G10K11/162
Inventor 辛锋先卢天健段明宇徐志敏于晨磊
Owner XI AN JIAOTONG UNIV
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