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- W2485221063 abstract "This chapter discusses the concept of sound absorption and its application. All materials can to a greater or lesser extent absorb sound—that is, they can convert the mechanical energy of molecular vibration into heat. The performance of a material is usually quantified in terms of its sound absorption coefficient. The chapter illustrates the following types of sound absorber: (1) fibrous absorbers, (2) fibrous layer covered with thin impervious membrane, (3) fibrous layer covered with perforated panel, (4) panel or membrane absorber, (5) resonator absorbers, (6) multiple resonator, and (7) functional absorbers. When a sound source is placed in an enclosure, the sound no longer radiates away from the source but is reflected back and forth between the walls of the enclosure. The sound energy grows to a level that depends upon the power of the source and also upon how much energy is removed by absorption at the surfaces of the enclosure. The chapter describes enclosures in which the sound energy is uniformly distributed—that is, where the sound field is diffuse. This is normally the case for enclosures with conventional aspect ratios but not for flat or shallow enclosures such as open plan offices or large factory spaces or in rooms with shapes that may cause some sound focusing." @default.
- W2485221063 created "2016-08-23" @default.
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- W2485221063 date "1987-01-01" @default.
- W2485221063 modified "2023-09-24" @default.
- W2485221063 title "Sound in the built form" @default.
- W2485221063 doi "https://doi.org/10.1016/b978-0-85139-018-5.50005-x" @default.
- W2485221063 hasPublicationYear "1987" @default.
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