COMPOSITE SOUND-ABSORBING DEVICE WITH BUILT IN RESONANT CAVITY
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United States of America Patent
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Issued Date -
Oct 4, 2012
app pub date -
Oct 14, 2010
filing date -
Jan 8, 2010
priority date (Note) -
Abandoned
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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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