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, and achieve the effects of widening the sound-absorbing frequency band, increasing sound resistance, and reducing the volume of the rear cavity
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Embodiment 1
[0041] 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
[0043] 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
[0049] 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 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 0.4...
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