Metal sound insulation low-frequency acoustical board

A sound-absorbing panel and sound-insulating technology, applied in the direction of sound insulation, building components, etc., can solve the problems of difficult to grasp the sound-absorbing frequency range, not belonging to the resonance sound-absorbing structure, unable to achieve the sound-absorbing effect, etc. Maximum, sound absorption frequency reduction effect

Inactive Publication Date: 2013-01-09
北京科奥克声学技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Currently widely used building decoration materials or structures such as gypsum board ceilings, gypsum board partition walls, wooden floors and wooden dadoes, etc., have a certain sound absorption effect, but they are not enough to generate resonance under the excitation of sound waves, and their sound absorption coefficient is only It can reach 0.3-0.4. Even if the whole room is covered with these sound-absorbing materials, the sound-absorbing effect with a sound absorption coefficient close to 1 cannot be achieved, and these sound-absorbing materials need to be processed on site according to the position and size, which belong to the scope of acoust...

Method used

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  • Metal sound insulation low-frequency acoustical board
  • Metal sound insulation low-frequency acoustical board
  • Metal sound insulation low-frequency acoustical board

Examples

Experimental program
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Embodiment 1

[0028] like figure 1 , figure 2 , image 3 As shown, a metal sound-insulating low-frequency sound-absorbing panel includes a shell made of bent steel plates, an elastic material 1, a resonant plate 2, and an elastic pad 3. The housing is a flat module with a size of 1*3*0.1m (width*height*thickness). The groove shape of the opening is convenient for filling glass wool sound-absorbing material inside when connecting adjacent modules, and then connecting and fixing with H-shaped connectors to improve its sound insulation and sealing effect. A layer of outer surface steel plate 6 is installed on the frame 4. The purpose is to improve the sound insulation of the module while making its outer surface firm and easy to assemble into a pentahedral room. The elastic material 1 and the resonant plate 2 are installed in the housing, wherein the elastic material can be glass wool, open-pore sponge, soft fiberboard and porous sound-absorbing material, and open-pore sponge is selected i...

Embodiment 2

[0032] The shape of the periphery of the frame 4 is a Z shape that extends outwards. It can be extended outwards on the upper and lower sides or on the left and right sides, or Z-shaped connectors can be installed to fix the module on the building wall. According to the needs of noise reduction frequency, the existing room Low-frequency sound absorption inside. Other structures of the module are the same as those in Embodiment 1.

Embodiment 3

[0034] The resonance plate 2 is a steel plate or an aluminum plate, and the thickness of the steel plate or the aluminum plate is 0.7-3mm. This embodiment is an 8mm galvanized steel plate. Since the steel plate is heavy, the resonance frequency of the thin plate resonant structure can be reduced. Others are the same as in Example 1.

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Abstract

The invention relates to a metal sound insulation low-frequency acoustical board, which has sound insulation and low-frequency sound absorption effects and can be widely applied in an acoustic room or anechoic chamber with low-frequency acoustic requirements. According to the absorption principle of resonance sound-absorbing materials and structures, resonance occurs when natural vibration frequency of resonance sound-absorbing materials and structures is consistent with frequency of sound wave, and the resonance sound-absorbing materials and structures can consume sound energy and plays a role in sound absorption when the resonance reaches the maximum amplitude. An elastic cushion, a sounding board and an elastic material are successively arranged between an internal surface metal perforated plate and an external surface steel plate which form the metal sound insulation low-frequency acoustical board provided by the invention, wherein the sounding board is composed of several nonmetal plates or metal sheets. An acoustic room prepared from the metal sound insulation low-frequency acoustical board has good low-frequency sound absorption characteristics. The inner wall of the acoustic room can be provided with a wedge absorber or flat sound absorber to form a low-frequency anechoic chamber, and the length of the wedge absorber can be shortened or the thickness of the flat sound absorber can be reduced so as to save land occupation and decrease cost of construction.

Description

technical field [0001] The invention relates to a sound-insulating and sound-absorbing board, in particular to a metal sound-insulating low-frequency sound-absorbing board. Background technique [0002] In addition to porous sound-absorbing materials, there is also a resonant sound-absorbing material and structure used in actual acoustic engineering. The sound absorption mechanism of resonant sound-absorbing materials and structures is that when the natural frequency of the sound-absorbing materials and structures is consistent with the frequency emitted by the sound waves, resonance occurs, and the sound waves excite the sound-absorbing materials and structures to vibrate and maximize the amplitude, thereby consuming Acoustic energy, to achieve the purpose of sound absorption. Therefore, the sound absorption characteristics of resonant sound-absorbing materials and structures show the appearance of peak sound absorption, that is, the sound absorption coefficient reaches th...

Claims

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Application Information

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IPC IPC(8): E04B1/86
Inventor 茹履京孙青华
Owner 北京科奥克声学技术有限公司
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