CHAPTER 2Practical Acoustics
Sound Absorptive Materials
Absorptive materials come in two basic types: porous and diaphragmatic (resonant or reactive). There are literally hundreds of porous absorbent materials with the most common being mineral or glass wool, molded or felted tiles, perforated panels, sprayed-on fibers with binders, foamed open-celled plastics, elastomers, and even normal room furniture such as cushions, upholstery, carpets, as well as draped fabric curtains. All are fuzzy and/or soft, and when sound pressure is exerted upon them they move. This movement causes friction which converts the pressure to heat and thus depletes the acoustic energy. In order to determine the amount of attenuation they provide, one must delve a bit ...
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