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Sound absorption metamaterial with adjustable sound absorption performance and additive manufacturing method thereof

An additive manufacturing and metamaterial technology, applied in the field of acoustic metamaterials, can solve problems such as difficult adjustment and poor adaptability to environmental conditions, and achieve the effects of good movement, ensuring no leakage of sound waves, and good sound absorption effect.

Pending Publication Date: 2021-04-09
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, once the structure is determined, its sound absorption performance is also determined, and it is difficult to adjust. Once the environmental noise changes, it needs to be redesigned and manufactured, and it has poor adaptability to changing environmental conditions.

Method used

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  • Sound absorption metamaterial with adjustable sound absorption performance and additive manufacturing method thereof
  • Sound absorption metamaterial with adjustable sound absorption performance and additive manufacturing method thereof
  • Sound absorption metamaterial with adjustable sound absorption performance and additive manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] When designing the structure of sound-absorbing metamaterials with adjustable sound-absorbing performance, it is first necessary to determine the sound-absorbing effect, and then determine the specific size parameters. There are many size parameters of sound-absorbing metamaterials, some of which have little effect on sound-absorbing performance (such as frame thickness, back plate thickness, etc.), and some have a greater impact on sound-absorbing performance (such as micropore diameter, micro-perforated plate thickness, acoustic channel length, etc.). Since the sound-absorbing metamaterial proposed in the present invention can realize the dynamic adjustment of the depth of the sound channel, it is first necessary to fix other dimensional parameters, and then adjust the sound-absorbing performance by stretching. Specific steps are as follows:

[0042] (1) The determination of the parameters needs to consider the constraints of the specific manufacturing process. For t...

Embodiment 2

[0048] (1) First determine the parameter value that has little influence on the sound absorption effect: take the thickness h of the back plate as 1.5mm, the thickness of the frame and the internal partition are both 0.5mm, and the gap between the frame and the internal partition is 0.1mm, Therefore, the distance between two adjacent sound channels is 1.7mm.

[0049] (2) Determine the parameter values ​​that have a greater impact on the sound absorption effect. The external dimension of the curling unit is 42mm, the depth of the sound channel is 10mm, the number of bending times of the first sound channel is 5 times, the number of bending times of the second sound channel is 3 times, and the width of the first sound channel is w 1 is 5mm, the width w of the second sound channel 2 According to the quantitative relationship, it can be obtained as 9mm. The aperture d of the microperforated plate 200 1 and d 2 2mm and 2.5mm respectively.

[0050] (3) Siemens NX 10.0 three-dim...

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Abstract

The invention belongs to the related technical field of acoustic metamaterials and discloses a sound absorption metamaterial with adjustable sound absorption performance and an additive manufacturing method thereof. The sound absorption metamaterial comprises a plurality of sound absorption metamaterial units, wherein each sound absorption metamaterial unit comprises a curling unit, a supporting unit and a plurality of sound absorption units, the internal space of the frame is divided into two parts of space by the spiral inner wall; the curling unit further comprises two internal partition plates which are arranged on the peripheral walls of the two parts of space in a sleeving manner respectively; the micro-perforated plate covers an opening in one end of the curling unit, two through holes are formed in the micro-perforated plate, and the two through holes are communicated with the two internal spaces of the internal partition plate respectively; a back plate covers an opening at the other end of the curling unit, the frame is connected with the back plate, the internal partition plates are connected with the micro-perforated plate, or the frame is connected with the micro-perforated plate, and the internal partition plates are connected with the back plate, so the two internal partition plates, the back plate and the micro-perforated plate form two sound channels. The sound absorption metamaterial is advantaged in that the sound absorption frequency range can be widened, and the sound absorption performance can be adjusted.

Description

technical field [0001] The invention belongs to the technical field related to acoustic metamaterials, and more specifically relates to a sound-absorbing metamaterial with adjustable sound-absorbing performance and an additive manufacturing method thereof. Background technique [0002] Low-frequency noise exists in various fields of aerospace, ships and life. Long-term exposure to low-frequency noise will cause significant harm to the human body. For example, noise exceeding 50dB will affect rest and sleep, exceeding 70dB will affect study and work, and exceeding 90dB will affect Affect hearing. Prolonged exposure to low-frequency noise will cause mental weakness, headaches, insomnia, loss of appetite, and lead to physical dysfunction. When the sound wave frequency reaches the human body resonance frequency and the sound intensity is large enough, it will cause death. Therefore, it is necessary to control low-frequency noise so that it is limited below the intensity that aff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/162B33Y50/02B33Y10/00
CPCG10K11/162B33Y50/02B33Y10/00
Inventor 宋波范军翔史玉升
Owner HUAZHONG UNIV OF SCI & TECH
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