| 摘要 |
Numerous embodiments of a nestable sound absorbing foam each including a reduced area of attachment to an adjacent wall surface and a variable depth air cavity to enhance absorption. The embodiments include various configurations of "one-dimensional" sine waves, saw tooth cross-sections, triangular and crown shaped cross-sections as well as square wave cross-sections and part cylindrical cross-sections. In addition, two-dimensional nested topologies with a variable depth air cavity are also described. In each embodiment, the major portion of the rear surface of the material which is to be attached to a wall surface is spaced as far as possible from the wall surface creating a variable depth air cavity to enhance sound absorption. When the rear air cavity is sealed, additional low frequency absorption is achieved by increased air flows through the foam material caused by the pressure gradient in the low frequency pressure zone.
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