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Multi-frequency sound absorption type acoustic superstructure

A super-structure, sound-absorbing technology, applied in the direction of sound-producing equipment, instruments, etc., can solve the problems of weak energy dissipation, limited use range and application scenarios, and occupied space.

Pending Publication Date: 2021-06-08
JIANGSU SOUND CUBIC ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional materials have weak energy dissipation in the low-frequency region. If you want to absorb low-frequency sound waves, you need a very thick structure (porous material) and a very deep back cavity (micro-perforated plate), which is not economical and takes up a lot of space. , which limits its scope of use and application scenarios

Method used

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  • Multi-frequency sound absorption type acoustic superstructure
  • Multi-frequency sound absorption type acoustic superstructure
  • Multi-frequency sound absorption type acoustic superstructure

Examples

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Effect test

Embodiment 1

[0039] Refer figure 1 with figure 2 The multi-frequency sound absorbing type acoustic super structure of the present embodiment includes two sound absorbing units, respectively, respectively, respectively, respectively, and the first sound absorbing unit 1 and the second sound absorbing unit 2. In the manufacture of photosensitive resin materials, in this embodiment, the first sound absorbing unit 1 and the second sound absorbing unit 2 employ a rectangular square structure in which the cross section is a square structure, and a section is provided in the first sounding unit 1. The cavity 103 is further provided with a first opening 101 on the first sounding unit 1, and the first opening 101 is coupled to the first cavity 103, and there is a first tube on the first opening 101. 102. The first tube 102 is a structure integrally formed with the first opening 101, and the first tube 102 extends into the first cavity 103, one side opposite the first cavity 103 and the first opening 10...

Embodiment 2

[0058] The multi-frequency sound absorbing acoustic super structure of this embodiment employs three absorbing units such that sound absorption noise is performed for noise having three low frequency.

[0059] Refer Figure 5 with Figure 6 The multi-frequency sound absorbing acoustic hyperplashes of the present embodiment include the first sounding unit 1, the third sound absorbing unit 3, and the fourth suction unit 4, the first sound absorbing unit 1, the third sound absorbing unit 3 and the fourth The sound absorbing unit 4 is made of photosensitive resin material.

[0060] Refer Figure 5 with Figure 6 In the present embodiment, the first sound absorbing unit 1, the third sound absorbing unit 3, and the fourth suction unit 4 employ a rectangular square structure having a square cross section, and a cross section is square in the first sound absorbing unit 1. A cavity 103, further provided with a first opening 101 on the first sounding unit 1, and the first opening 101 is coupled...

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Abstract

The invention relates to a multi-frequency sound absorption type acoustic superstructure. The superstructure comprises a plurality of sound absorption units connected in sequence, wherein a cavity is formed in each sound absorption unit, the cavities in every two adjacent sound absorption units communicate with each other through an open hole, and a first open hole is further formed in the first sound absorption unit and communicates with the cavity in the sound absorption unit. The superstructure is advantaged in that the multiple sound absorption units are arranged, each sound absorption unit forms one Helmholtz resonant cavity through the cavity and the opening, each sound absorption unit is equivalent to one Helmholtz resonant cavity, multiple sets of absorption peaks can be generated by combining the cavities of the multiple different units, almost perfect sound absorption can be achieved for multiple sets of frequencies, and the sound absorption and noise reduction effects are improved.

Description

Technical field [0001] The present application relates to the technical field of acoustic materials, in particular, involving a multi-band acoustic super structure. Background technique [0002] The absorption of sound is of great significance in indoor acoustic and environmental noise control. Since the beginning of the last century, the application is endless, and the ears can listen to the sound wave frequency range 20Hz to 20000Hz, and the absorption of sound waves in the air, that is, the loss is usually Small, therefore, the loss of sound waves mainly occurs by the following mechanism: viscous loss of the solid surface and the air, since the viscous boundary layer of the solid surface is no slip, the solid interface has a viscous layer, in general, speed gradient The greater the difference, the greater the viscous loss, so the acoustic material is the weight of the noise reduction project, and the traditional acoustic material is divided into two parts: acoustic porous mate...

Claims

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Application Information

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IPC IPC(8): G10K11/16G10K11/162
CPCG10K11/16G10K11/162
Inventor 俞俊徐明
Owner JIANGSU SOUND CUBIC ENVIRONMENTAL PROTECTION TECH
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