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COMPOSITE SOUND-ABSORBING DEVICE WITH BUILT IN RESONANT CAVITY

  • US 20120247867A1
  • Filed: 10/14/2010
  • Published: 10/04/2012
  • Est. Priority Date: 01/08/2010
  • Status: Abandoned Application
First Claim
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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%.

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