Broadband ultrathin sound absorption and sound insulation structure for controlling sound wave propagation path

A technology of sound absorption and sound insulation and transmission path, which is applied in the direction of sound insulation, sound generating equipment, building components, etc., and can solve problems such as poor sound absorption and sound insulation effects and difficult design

Active Publication Date: 2017-07-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the common problem of sound-absorbing and sound-insulating structures is that under the condition of strictly restricting the thickness and weight of the structure, the sound-absorbing and sound-insulating effect is generally good in the mid-frequency and high-frequency bands, but the sound-absorbing and sound-insulating effect is poor in the low-frequency band. The lower limit of the cut-off frequency of sound absorption and sound insulation is extended to below 100Hz, and the design will be very difficult while taking into account the performance of broadband sound absorption and sound insulation

Method used

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  • Broadband ultrathin sound absorption and sound insulation structure for controlling sound wave propagation path
  • Broadband ultrathin sound absorption and sound insulation structure for controlling sound wave propagation path
  • Broadband ultrathin sound absorption and sound insulation structure for controlling sound wave propagation path

Examples

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Effect test

Embodiment 1

[0028] Example 1: Broadband ultra-thin sound-absorbing structure for controlling the propagation path of sound waves

[0029] Multiple sound-absorbing units are arranged along the surface of the back wall 3 to form a broadband ultra-thin sound-absorbing structure that controls the propagation path of sound waves, such as figure 1 shown. Wherein, each sound absorption unit includes a sound wave convergence section 1 and a sound wave absorption section 2, the structure is as follows image 3 shown.

[0030] The acoustic wave converging section 1 is composed of an acoustic wave converging cavity filled with acoustic materials. Among them, the cavity is a variable-section cavity, and the end face is a regular hexagon; the cavity is filled with the same acoustic material 4, and the multilayer film 5 is embedded in it at equal intervals.

[0031] The sound wave absorption section 2 is composed of the sound wave absorption labyrinth channel 11 filled with the sound absorption mate...

Embodiment 2

[0034] Example 2: Broadband Ultrathin Sound Absorbing Structure Controlling the Propagation Path of Sound Waves

[0035] This embodiment is basically the same as Embodiment 1, the difference is that (1) the sound wave converging section in the sound absorbing unit is as follows: Figure 5 As shown in the figure, the end face of the acoustic wave converging cavity is circular; (2) the single-layer structure of the acoustic wave absorption labyrinth channel 11 in the sound absorption unit is as follows Figure 8 shown.

Embodiment 3

[0036] Example 3: Broadband Ultrathin Sound Absorbing Structure Controlling the Propagation Path of Sound Waves

[0037] This embodiment is basically the same as Embodiment 1, the difference is that (1) the sound wave converging section in the sound absorbing unit is as follows: Image 6 As shown, the end face of the acoustic wave converging cavity is triangular; (2) the single-layer structure of the acoustic wave absorption labyrinth channel 11 in the sound absorption unit is as follows Figure 9 shown.

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Abstract

A broadband ultrathin sound absorption and sound insulation structure for controlling a sound wave propagation path comprises at least one sound absorption and sound insulation unit, and each sound absorption and sound insulation unit comprises at least one sound wave converging section and at least one sound wave absorption section. The sound wave converging section is formed by a sound wave converging mold cavity filled with acoustics materials, the mold cavity is a variable cross-section mold cavity, the cavity is filled with isotropy or anisotropy acoustics materials, and the anisotropy acoustics materials are formed by acoustic materials embedded into a film or a silk screen. The sound wave absorption section is formed by a sound wave absorption labyrinth channel filled with sound absorption materials, the channel is a labyrinth single-communication channel with a closed or opened end and is communicated with the sound wave converging mold cavity. The sound wave converging mold cavity controls the sound wave propagation path through section changing of the mold cavity and the changing of the material equivalent parameters in the cavity to allow the sound wave to converge and propagate along a curve. The sound wave absorption section employs the ultra-long path of the sound wave absorption labyrinth channel to realize effective sound absorption of the broadband through filled sound absorption materials and arranged period local oscillators.

Description

technical field [0001] The invention belongs to the technical field of vibration reduction and noise reduction, and relates to a broadband ultra-thin sound absorption and sound insulation structure for controlling the propagation path of sound waves. Background technique [0002] At present, the common problem of sound absorption and sound insulation structure is that under the condition of strictly limiting the thickness and weight of the structure, the sound absorption and sound insulation effect is generally good in the intermediate frequency and high frequency band, but the sound absorption and sound insulation effect in the low frequency band is poor. The lower limit of the cut-off frequency of sound absorption and sound insulation is extended to below 100Hz, and the performance of broadband sound absorption and sound insulation is taken into account, so the design will be very difficult. In order to solve this problem, the present invention discloses a broadband ultra-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/162E04B1/86
CPCG10K11/162E04B1/86Y02T90/00
Inventor 王晓明梅玉林梅艺璇
Owner DALIAN UNIV OF TECH
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