Composite sound absorbing device with built-in resonant cavity

A sound-absorbing device and resonant cavity technology, which is applied in the direction of sound-emitting devices, instruments, building components, etc., can solve the problems of insufficient low-frequency sound absorption, etc., and achieve the effects of widening the sound-absorbing frequency band, improving the sound-absorbing coefficient, and flexible design

Active Publication Date: 2010-06-09
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a composite sound-absorbing device with a built-in resonant cavity in order to overcome the defect of insufficient low-frequency sound absorption in the above-mentioned method for current noise control

Method used

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  • Composite sound absorbing device with built-in resonant cavity
  • Composite sound absorbing device with built-in resonant cavity
  • Composite sound absorbing device with built-in resonant cavity

Examples

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Embodiment 1

[0042] refer to figure 1 In this embodiment, a composite sound-absorbing device with a built-in resonant cavity of the present invention is produced. The device is a closed cavity composed of a perforated plate 1 made of stainless steel, a back plate 2 made of stainless steel and a side plate 3 made of stainless steel. A square stainless steel plate with a thickness of 5 mm. The first hole 6 is provided on the perforated plate 1. The diameter of the first hole 6 is 3 mm. The perforation rate of the first hole 6 is 28%. The arrangement of the first holes 6 on the perforated plate 1 is regular. There are four resonant cavities 5 in the closed cavity, the resonant cavity 5 is an aluminum spherical cavity, and the volume of the resonant cavity 5 is 1.4×10 4 mm 3 , the cavity wall thickness of the resonant cavity 5 is 5 mm; there is a second hole 6' on the cavity wall of the resonant cavity 5, the aperture d' of the second hole 6' is 2 mm, and the perforation rate σ' of the secon...

Embodiment 2

[0044] refer to figure 2 In this embodiment, a composite sound-absorbing device with a built-in resonant cavity of the present invention is produced. The device is a closed cavity composed of a perforated plate 1 made of stainless steel, a back plate 2 made of stainless steel and a side plate 3 made of stainless steel. The depth D of the closed cavity is 50 mm, and the perforated plate 1 is a circle with a diameter of 100 mm. Shaped stainless steel plate with a thickness of 0.7 mm. The perforated plate 1 is provided with a first hole 6. The diameter of the first hole 6 is 1.7 mm. The perforation rate of the first hole 6 is 4.6%. The arrangement of the first holes 6 on the perforated plate 1 Arranged in a regular square; there are four resonant cavities 5 in the closed cavity, the resonant cavity 5 is a plastic sphere cavity, and the volume of the resonant cavity 5 is 3.35×10 4 mm 3 , the thickness of the cavity wall of the resonant cavity 5 is 0.4mm; there are 26 second hol...

Embodiment 3

[0050] refer to figure 2 In this embodiment, a composite sound-absorbing device with a built-in resonant cavity of the present invention is fabricated. The device is a closed cavity composed of a perforated plate 1 made of stainless steel, a back plate 2 made of stainless steel and a side plate 3 made of stainless steel. The depth D of the closed cavity is 100 mm, and the perforated plate 1 is a circle with a diameter of 100 mm. Shaped stainless steel plate with a thickness of 0.7 mm. The perforated plate 1 is provided with a first hole 6. The diameter of the first hole 6 is 1.7 mm. The perforation rate of the first hole 6 is 4.6%. The arrangement of the first holes 6 on the perforated plate 1 It is arranged in a regular square; 9, 7, 4 and 1 resonant cavities 5 are placed in the closed cavity in stages, the resonant cavity 5 is a plastic sphere cavity, and the volume of the resonant cavity 5 is 3.35×10 4 mm 3 , the thickness of the cavity wall of the resonant cavity 5 is 0...

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Abstract

The invention relates to a composite sound absorbing device with a built-in resonant cavity. The device comprises a perforated plate with a plurality of first holes, a back plate and a side plate, wherein a sealed cavity is formed by the perforated plate, the back plate and the side plate. The device is characterized in that at least one or more resonant cavities are placed in the sealed cavity; the resonant cavity is provided with at least one or more second holes; at least one of the second holes is communicated with the sealed cavity; the volume V of the resonant cavity is equal to 10mm3-1*1,010mm3, and the thickness of the wall of the cavity is 0.05 to 10 mm; and the aperture d, of the second hole on the cavity is equal to 0.05 to 100 mm, and the perforated percentage sigma, is 0.01 to 30 percent. The device forms acoustic scattering in the sealed cavity through the resonant cavity; and the second hole increases the acoustic resistance and the multi-cavity coupling resonance. The device has a flexible design and contributes to improving sound absorbing effect and expanding the sound absorbing frequency band.

Description

technical field [0001] The invention relates to a compound sound-absorbing device, in particular to a compound sound-absorbing device with a built-in resonant cavity. Background technique [0002] There are many kinds of sound-absorbing materials and sound-absorbing structures used in noise control engineering, which can be roughly divided into porous sound-absorbing materials and resonant sound-absorbing materials according to their sound-absorbing principles. For example, fiber materials and plaster materials are all porous sound-absorbing materials, while thin-plate resonance sound-absorbing structures, thin-film resonance sound-absorbing structures, and perforated plate resonance sound-absorbing structures are all resonant sound-absorbing materials. 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 a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172
CPCE04B1/86E04B2001/8428G10K11/172E04B2001/8452
Inventor 张倩吕亚东杨军
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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