Petal-shaped channel porous sound absorption structure

A technology of porous sound absorption and petals, which is applied to sound-generating devices and instruments, and can solve the problems of large sound-absorbing structures, long wavelengths of low-frequency sound waves, and poor sound-absorbing effects

Pending Publication Date: 2021-09-07
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical engineering applications, it is usually necessary for the sound-absorbing structure to be sufficiently light and thin, which can reduce the volume it occupies and facilitate its flexible installation. However, the traditional sound-absorbing structure has a large size and cannot fully meet the engineering needs.
At the same time, due to the long wavelength of low-frequency sound waves, it is difficult for traditional sound-absorbing structures to show good sound-absorbing performance for low-frequency sound waves in a small thickness, and there are problems that the sound-absorbing frequency band is not easy to adjust, and the sound-absorbing effect is not good.

Method used

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  • Petal-shaped channel porous sound absorption structure
  • Petal-shaped channel porous sound absorption structure

Examples

Experimental program
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Embodiment

[0047] see figure 1 , the sound absorber includes a rigid backing 1 and a perforated panel 2 .

[0048] The thickness of the perforated panel 2 is 3 cm, and petal-shaped microchannels 3 with a reference hole diameter D of 0.6 mm are evenly opened on the perforated panel 1 to allow noise to enter the sound absorbing body, thereby achieving the purpose of sound absorption. The petal-shaped microchannels 3 are arranged in a square, with a porosity of 40%. The range of roughness factor ε is [0,0.1], and the range of n is [0,12].

[0049] In this embodiment, the sound absorption coefficient corresponding to the smooth circular hole (ε=0, n is arbitrary) can reach 0.80 at 2680 Hz, and the bandwidth of the sound absorption coefficient above 0.5 can reach 1640 Hz (from 2000 to 3640 Hz).

[0050] see figure 2 , introduce petal-shaped micro-channel shape, the petal-shaped micro-channel shape 1 (ε=0.05, n=6) corresponds to the sound absorption coefficient of the sound absorbing body ...

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Abstract

The invention discloses a petal-shaped channel porous sound absorption structure, which is characterized in that a perforated panel is arranged on a rigid backing, a plurality of petal-shaped micro-channels are arranged on the perforated panel in parallel at intervals, and the radius r of each petal-shaped micro-channel meets the function relation of polar coordinates theta. The petal-shaped channel porous sound absorption structure is simple in structure, convenient to use, excellent in sound absorption effect, wide in sound absorption frequency band, suitable for indoor walls and inner wall faces of vehicles and capable of well replacing an existing artificial porous sound absorber.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a petal-shaped channel porous sound-absorbing structure. Background technique [0002] The existing porous sound-absorbing structure is a sound-absorbing structure that utilizes the energy dissipation of internal sound-absorbing microchannels, and is mainly used in concert halls, museums, libraries, and the inner walls of vehicles. In practical engineering applications, it is usually necessary for the sound-absorbing structure to be sufficiently light and thin, which can reduce the volume it occupies and facilitate its flexible installation. However, the traditional sound-absorbing structure has a large size and cannot fully meet the engineering needs. At the same time, due to the long wavelength of low-frequency sound waves, it is difficult for traditional sound-absorbing structures to exhibit good sound-absorbing performance for low-frequency sound waves ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/162
CPCG10K11/162
Inventor 辛锋先刘懋霖
Owner XI AN JIAOTONG UNIV
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