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Space bending low-frequency sound absorption superstructure based on grooving type corrugated layer core

A corrugated layer and superstructure technology, applied in the direction of sound-generating equipment, instruments, etc., can solve the problems of large cavity volume, inability to carry independently, and single function of micro-perforated sound-absorbing body, so as to increase the sound wave propagation path and reduce the equivalent Spring stiffness, the effect of enhancing absorption performance

Pending Publication Date: 2021-06-29
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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Problems solved by technology

So as to solve the problems of the existing micro-perforated sound absorbing body such as single function, inability to carry independently, and large cavity volume

Method used

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  • Space bending low-frequency sound absorption superstructure based on grooving type corrugated layer core
  • Space bending low-frequency sound absorption superstructure based on grooving type corrugated layer core
  • Space bending low-frequency sound absorption superstructure based on grooving type corrugated layer core

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Embodiment Construction

[0024] The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0025] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Orientation indicated by rear, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc. The positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as limiting the invention.

[0026] figure 1 A three-dimensional structu...

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Abstract

The invention discloses a space bending low-frequency sound absorption superstructure based on a grooving type corrugated layer core, and belongs to the field of composite acoustic meta-materials. The superstructure comprises a perforated plate, a grooving type corrugated layer core, a lower panel, a left inclined frame plate, a right inclined frame plate, a front frame plate and a rear frame plate. On one hand, the sound absorption structure is evolved into a perforated sound absorber with a cavity by forming submillimeter-level to millimeter-level holes in a penetrating mode. On the other hand, the corrugated layer core with a bearing function is introduced into the cavity, and double-side staggered grooving is ingeniously performed on the corrugated layer core, so that the back cavity is of a space coiling structure, and the low-frequency noise absorption performance of the sound absorber can be greatly enhanced without increasing the total thickness. The structure is simple and practical, has good medium-low frequency band sound absorption performance and independent bearing capacity, and has a good and wide application prospect.

Description

technical field [0001] The invention belongs to the field of composite acoustic metamaterials, in particular to a space-bending low-frequency sound-absorbing superstructure based on a groove-cut corrugated layer core. Background technique [0002] Low and medium frequency noise has a strong penetrating ability and has always been the main source of cabin noise pollution. At present, traditional sound-absorbing materials such as porous materials have been proven to effectively absorb medium and high-frequency noise (>1000Hz); in the low-frequency range, micro-perforated plate sound absorbers are often used, but this method requires a structural thickness equivalent to the wavelength It can only be realized, and it is easy to be restricted by space. On the other hand, the existing sound-absorbing superstructure usually adopts the method of inserting partitions in the cavity, as described in the article Broadband near-perfect absorption of low-frequencysound by subwavelengt...

Claims

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Application Information

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IPC IPC(8): G10K11/16G10K11/162
CPCG10K11/16G10K11/162Y02T90/00
Inventor 曾向阳孙玮任树伟
Owner NORTHWESTERN POLYTECHNICAL UNIV
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