| 摘要 |
An acoustic damping building material comprising an acoustic damping layer secured to at least a portion of a substrate 310. The acoustic damping layer comprises at least two media 322, 324, preferably of different transmission co-efficient, wherein the at least two media are configured such that the acoustic damping layer comprises at least one direct energy transmission pathway and at least one indirect energy transmission pathway through the acoustic damping layer to the substrate. The first media may be a granular particulate material such as rubber bonded together with a polyurethane, abutting neighbouring granules forming direct paths and voids forming the second media which may be air between granules forming indirect paths. |
