COMPOSITE SOUND-ABSORBING DEVICE WITH BUILT IN RESONANT CAVITY
First Claim
1. A composite sound-absorbing device with built-in resonant cavity, including:
- a perforated board having a number of first pores thereon, a back board and side boards, said perforated board, back board and side boards forming a closed cavity, wherein;
at least one or more independent said resonant cavities being located within said closed cavity randomly;
said resonant cavities being in a shape of sphere, ellipsoid or polyhedron;
at least one or more of second pores being located on said resonant cavities; and
at least one of said second pores being connected with said closed cavity;
said resonant cavity having a volume of V=10 mm3-1×
1010 mm3, the thickness of the wall of the cavity being 0.05 mm-10 mm, said second pores having an aperture of d′
=0.05-100 mm, with a perforation rate σ
′
=0.01%-30%.
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Accused Products
Abstract
The composite sound-absorbing device of the present invention includes a perforated board having a number of first pores thereon, a back board and side boards, the perforated board, back board and side boards forming a closed cavity, wherein: at least one or more of the resonant cavities being located within the closed cavity; at least one or more of second pores being located on the resonant cavities; at least one of the second pores being connected with the closed cavity; the resonant cavity having a volume of V=10 mm3 −1×1010 mm3, having a thickness of 0.05 mm-10 mm, the second pores having an aperture of d′=0.05-100 mm, with a perforation rate σ′=0.01%-30%. The present invention is beneficial to improve the effect of sound-absorbing and expand the frequency band of sound-absorbing.
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Citations
10 Claims
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1. A composite sound-absorbing device with built-in resonant cavity, including:
- a perforated board having a number of first pores thereon, a back board and side boards, said perforated board, back board and side boards forming a closed cavity, wherein;
at least one or more independent said resonant cavities being located within said closed cavity randomly;
said resonant cavities being in a shape of sphere, ellipsoid or polyhedron;
at least one or more of second pores being located on said resonant cavities; and
at least one of said second pores being connected with said closed cavity;said resonant cavity having a volume of V=10 mm3-1×
1010 mm3, the thickness of the wall of the cavity being 0.05 mm-10 mm, said second pores having an aperture of d′
=0.05-100 mm, with a perforation rate σ
′
=0.01%-30%. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9, 10)
- a perforated board having a number of first pores thereon, a back board and side boards, said perforated board, back board and side boards forming a closed cavity, wherein;
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3. (canceled)
Specification