Composite resonance sound absorption device of tube bundle perforated plate

A technology of resonant sound absorption and perforated plate, which is applied in the direction of sound-emitting devices and instruments, can solve the problems of insufficient low-frequency sound absorption, and achieve the effect of increasing sound absorption coefficient, increasing sound resistance, and good effect

Active Publication Date: 2010-02-10
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect of insufficient low-frequency sound absorption in the current noise control using the above method, and at the same time broaden the sound absorption frequency band to the greatest extent, thereby providing a method of reducing the depth of the resonant cavity of the sound-absorbing structure of the pe

Method used

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  • Composite resonance sound absorption device of tube bundle perforated plate
  • Composite resonance sound absorption device of tube bundle perforated plate
  • Composite resonance sound absorption device of tube bundle perforated plate

Examples

Experimental program
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Effect test

Embodiment 1

[0037] refer to figure 1 , the present embodiment makes a tube bundle perforated plate composite resonance sound-absorbing device, which is a closed cavity composed of a perforated plate 1, a back plate 2 made of stainless steel plate and a side plate 3 made of stainless steel plate, the closed cavity Cavity depth D, for example, D is 10mm, 100mm, 200mm, 300mm, 500mm, 1000mm or 1500mm; the perforated plate is a circular stainless steel plate with a diameter of 100mm and a thickness of 1.8mm. The perforated plate is provided with micro-slits and holes. The width of the micro-slit is 0.04mm, the length of the micro-slit is 3.6mm, and the diameter of the hole is 1.6mm; wherein, the penetration rate ρ of the micro-slit 7, for example, ρ is 0.1%, 1%, 6%, 10%, 20% or 30%. Wherein, the diameter of the hole 6 is 1.6mm, and the perforation rate σ of the hole 6, for example, σ is 0.1%, 1%, 6%, 10%, 20% or 30%. The micro-slits 7 on the perforated plate 1 are arranged in a regular square...

Embodiment 2

[0053] In the standing wave measuring tube, the experimental research on the noise elimination mechanism of the tube bundle perforated plate composite resonance sound absorption device without laying sound-absorbing cotton was completed, and the resonance of the tube bundle perforated plate composite resonance sound absorption device and the perforated plate (including micro-slits and holes) was compared and measured The sound absorption characteristics of the sound-absorbing structure determine the influence of the pipe length, cavity depth, and perforation rate structural parameters on its acoustic performance, such as Figure 5 shown.

[0054] Parameters: tube bundle diameter: 1.6mm, perforation rate: 5%, micro-slit length: 1.8mm, micro-slit width: 0.05mm

[0055] Image 6 The sound absorption characteristics under the following 10 different conditions were compared

[0056] 1) The length of the tube bundle is 350mm, and the cavity depth is 200mm

[0057] 2) The length o...

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Abstract

The invention relates to a composite resonance sound absorption device of a tube bundle perforated plate, comprising a sealed cavity composed of a perforated plate, a back plate and a lateral plate; the perforated plate is penetrated with superfine seams and voids; a tube bundle is formed by arraying N pieces of tubes which are placed in the sealed cavity, and one end of each tube penetrates intothe perforated plate or is inserted into the perforated plate by a transient joint to be connected with the perforated plate, and the other end thereof is an open or sealed end; the diameter of the tube is equal to that of the void; the external surface of the perforated plate is coated with a layer of porous sound absorption material; and N is less than or equal to the number of 6 of the voids. The invention combines the resonance sound absorption structure, superfine seam sound absorption structure and porous sound absorption material of the tube bundle perforated plate, uses the sound absorption theory of dissipating and absorbing through tube cavity coupling resonance and superfine seam resonance as well as porous sound absorption material to add acoustic resistance, intensify sound absorption, increase sound quality, lead the resonance absorption peak to move to low frequency, expand sound absorption frequency band, enhance sound absorption coefficient and realize the aim of broadband sound absorption.

Description

technical field [0001] The invention relates to a resonance sound absorption structure, in particular to a tube bundle perforated plate composite resonance sound absorption device combining the tube bundle perforated plate resonance sound absorption structure, micro-slit sound absorption structure and porous sound absorption material. Background technique [0002] There are many types of sound-absorbing materials and sound-absorbing structures used in noise control engineering. According to their sound-absorbing principles, they can be roughly divided into porous sound-absorbing materials, thin-plate resonance sound-absorbing structures, thin-film resonance sound-absorbing structures, and perforated plate resonance sound-absorbing structures. Ma Dayou's article on "Theory and Design of Micro-perforated Sound Absorbing Structure" published in "Science China" in 1975 and "Theory of Micro-Slit Acoustic Body" published in "Acta Acoustica" in 2000, will resonate The application o...

Claims

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Application Information

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IPC IPC(8): G10K11/172G10K11/162
Inventor 吕亚东马大猷唐惠德张倩
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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