Multiple helmholtz resonator parallel cellular sandwich wood sound absorption plate

A technology of sound-absorbing panels and resonators, applied in covering/lining, layered products, buildings, etc., can solve the problems of narrow sound-absorbing frequency band, poor sound-absorbing effect, small chamber volume ratio, etc., and achieve broadening of sound-absorbing frequency band , low cost, and high chamber volume ratio

Inactive Publication Date: 2011-02-02
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of small chamber volume ratio, narrow sound absorption frequency band and poor sound absorption effect in the existing sound-absorbing panels, the present invention further provides a multi-Helmholtz resonator parallel honeycomb sandwich wooden sound-absorbing panel

Method used

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  • Multiple helmholtz resonator parallel cellular sandwich wood sound absorption plate
  • Multiple helmholtz resonator parallel cellular sandwich wood sound absorption plate
  • Multiple helmholtz resonator parallel cellular sandwich wood sound absorption plate

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Experimental program
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specific Embodiment approach 1

[0013] Specific implementation mode one: as Figure 2a , Figure 2b , image 3 and Figure 4 As shown, the multi-Helmholtz resonator parallel honeycomb sandwich wooden sound-absorbing panel in this embodiment includes a panel 1, a core layer 2 and a back panel 3, and the core layer 2 is sandwiched between the panel 1 and the back panel 3 And the three are connected together; the core layer 2 is a honeycomb core layer (honeycomb core material). The section is that the inner cavity of the hexagonal cylinder is a honeycomb chamber; the chamber volume ratio of the core layer 2 (the chamber volume ratio is equal to the percentage of the volume sum of all cavities in the core layer accounting for the core layer volume) is greater than 90%, several perforations (small through holes) 1-1 are opened on the panel 1, and the area of ​​the perforation shape surrounded by the outline of each perforation 1-1 is smaller than the hexagonal area on the corresponding core layer 2 1 / 4 of the...

specific Embodiment approach 2

[0015] Embodiment 2: The perforation rate (percentage of the hole area in the panel area) of the panel 1 in this embodiment is 3-10%. , has been proved by countless experiments that the combination of the two technical parameters of the core layer 2 with a chamber volume ratio greater than 90% and the panel 1 with a perforation rate of 3-10% greatly improves the sound absorption rate. When the core layer 2 remains unchanged, the combination of the two technical parameters of the core layer 2 with a chamber volume ratio greater than 90% and the panel 1 with a perforation rate of 3 to 10% can increase the sound absorption rate by 8% to 10%. %. The panel 1 can be perforated according to a certain pattern. Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0016] Specific implementation mode three: as image 3 As shown, in this embodiment, each perforation 1-1 is a circular hole, and the aperture (diameter) of the circular hole is 1-10 mm. Other compositions and connections are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a multiple helmholtz resonator parallel cellular sandwich wood sound absorption plate, belonging to the field of sound absorption technologies. The invention solves the problems of small chamber volume ratio, narrow sound absorption frequency band and poor sound absorption effect in the traditional sound absorption panels. Technical essential is characterized in that a sandwich layer is a cellular sandwich layer; the cellular sandwich layer is formed from splicing a plurality of cylinder bodies with hexagonal cross sections; an inner cavity of each hexagonal cylinder body is a cell cavity chamber; the chamber volume ratio of the sandwich layer is larger than 90%; the area of perforation shape surrounded by contour lines of each perforation is less than a half of the hexagonal area of corresponding sandwich layer; and each small through hole on a panel is communicated with the cell cavity chamber at the corresponding position of the sandwich layer. The invention has wider sound absorption frequency band and better medium high frequency sound absorption performance, and the sanding wave tube method sound absorption coefficients respectively reach 0.8, 0.9 and 0.7 at 500Hz, 1000Hz and 2000Hz. In addition, the invention also has the characteristics of light weight, high ratio of strength to weight, good decorative effect, and the like; and wood resources can be saved, preparation process is simple, and cost is low.

Description

technical field [0001] The invention relates to a sound-absorbing panel, which belongs to the technical field of sound-absorbing. Background technique [0002] With the continuous development of large-scale industrial production, noise pollution has become one of the three major pollutions alongside air pollution and water pollution, and has been listed as the main problem of environmental pollution control in the 21st century. Noise affects normal work order and work efficiency, and also affects people's daily life and physical and mental health. Controlling noise has become a top priority for human beings. [0003] Sound absorption is one of the main measures of noise control. At present, inorganic fiber porous sound-absorbing materials such as mineral wool and glass wool are generally used as decorative materials for indoor sound absorption. During the installation and construction process, they are brittle and easy to break to form dust that pollutes the environment, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B3/12E04F13/075
Inventor 于海鹏郭禾苗
Owner NORTHEAST FORESTRY UNIVERSITY
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