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Acoustic shielding screen for absorbing sound by using coplanar hollow tube

A hollow tube and sound-absorbing screen technology, applied in the direction of sound-producing equipment, instruments, etc., can solve the problems of adding extra weight, sound-absorbing materials occupy a large space, etc., and achieve the effect of reducing thickness

Active Publication Date: 2015-06-24
杨军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This level of thickness is unacceptable in practical applications. First, the sound-absorbing material will take up a lot of space, second, it will greatly increase the extra weight, and third, it is completely impossible to achieve in many cases, such as inside the engine, in an airplane, etc. in the cabin

Method used

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  • Acoustic shielding screen for absorbing sound by using coplanar hollow tube
  • Acoustic shielding screen for absorbing sound by using coplanar hollow tube
  • Acoustic shielding screen for absorbing sound by using coplanar hollow tube

Examples

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with accompanying drawing.

[0033] figure 1 It is an implementation of the present invention, wherein the sound-absorbing screen 1 includes a coplanar hollow tube 2 formed by an opening 3 , a spiral groove 2 and a closed end 4 .

[0034] figure 2 The equivalent relationship between the coplanar hollow tube structure and the Helmholtz resonant cavity in the present invention is shown. When the sound wave is incident into the straight hollow tube, the opening of the straight hollow tube is equivalent to the neck of the Helmholtz resonator, and the deep part inside is equivalent to the cavity of the Helmholtz resonator ( figure 2 a). Coiled (coplanar) hollow tubes ( figure 2 b) with straight hollow tube ( figure 2 a) have the same working mechanism.

[0035] image 3 The internal structure of the coplanar hollow tube sound-absorbing screen of the present invention is shown. The through hole 3...

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PUM

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Abstract

The invention discloses an ultrathin acoustic shielding screen for absorbing sound by using a coplanar hollow tube. The ultrathin acoustic shielding screen is composed of a screen plate, an opening plate with a through hole, and a resonant tube with one open end and one sealed end. The resonant tube is embedded into the screen plate in a coiled manner. The opening end of the resonant tube is in sealed connection with the through hole of the opening plate. The ultrathin acoustic shielding screen differs from a conventional linear hollow tube structure. The central axis of the coplanar hollow tube is in a curved shape and the coplanar hollow tube is embedded in the acoustic shielding screen in a two-dimensional coiled manner. The total thickness of the acoustic shielding screen is far less than the wavelength of an acoustic wave absorbed by the acoustic shielding screen and is just one percent of the wavelength of the absorbed acoustic wave.

Description

technical field [0001] The present invention relates to a sound-absorbing screen comprising coplanar resonant tubes, which greatly reduces the minimum thickness required for complete sound absorption in a certain frequency range, as opposed to conventional straight tubes. Background technique [0002] Currently, traditional sound-absorbing materials or structures require a minimum thickness of a quarter wavelength to achieve complete absorption of sound waves of a certain frequency. Although there are a variety of sound-absorbing materials in daily life, such as sponges, foamed metals, fibers, porous plates, etc., to completely absorb sound waves of a certain wavelength, the thickness of these materials and structures usually needs to be at least four times the wavelength. one-third. For low-frequency sound waves, due to their large wavelengths, the required material thickness is even greater. For example, to absorb a sound wave of 300Hz, the corresponding quarter waveleng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172
Inventor 杨军蔡小兵
Owner 杨军
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