Recent Trends in Porous Sound-Absorbing Materials

摘要: Sound-absorbing materials absorb most of the sound energy striking them, making them very useful for control noise. They are used in a variety locations - close to sources noise, various paths, and sometimes receivers. Although all some incident sound, term "acoustical material" has been primarily applied those that have produced specific purpose providing high values absorption. The major uses absorbing almost invariably found include reduction reverberant pressure levels and, consequently, reverberation time enclosures, or rooms. A wide range sound-absorbing exist. In 1970s, public health concerns helped change main constituents from asbestos-based new synthetic fibers. Although, these fibers much safer human health, more recently, issues related global warming may increase use natural instead ones.