Acoustic Absorbers and Diffusers: Theory, Design and by Trevor J. Cox

By Trevor J. Cox

Absorbers and diffusers are of the most layout instruments for changing the acoustic stipulations of rooms, semi-enclosed areas and the outside atmosphere. Their right use is necessary for offering prime quality acoustics.
Unique and authoritative, this publication decribes how you can successfully degree, version, layout and follow diffusers and absorbers. it's a source for brand spanking new and skilled acousticians, looking an knowing of the evolution, features and alertness of recent diffusers. Absorption is a extra proven know-how and so the booklet blends conventional designs with smooth advancements. The ebook covers sensible and theoretical facets of absorbers and diffusers and is easily illustrated with examples of installations and case studies.
This re-creation brings Acoustic Absorbers and Diffusers updated with present examine, perform and criteria. New advancements in dimension, fabrics, concept and perform because the first variation (published in 2004) are integrated. The sections on absorbers are prolonged to incorporate extra approximately noise regulate.

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Sample text

The problem with resonant absorbers is that they usually only provide narrow band absorption. To cover a wide bandwidth, a series of absorbers are required, each tuned to a different frequency range. Alternatively, double-layered absorbers can be used, but are expensive to construct. Resonant absorbers are discussed in Chapter 6. An alternative, but expensive solution is to use active absorbers. Active absorbers have much in common with active noise control systems, and are discussed in Chapter 13.

The transfer matrix approach is the basis for many of the prediction techniques given in this book. A similar process is used in transducer modelling, where the method is called a two-port network. 1 Transfer matrix modelling The transfer matrix approach to modelling sound propagation is a very powerful technique most often applied to porous absorption with and without membrane or perforated facings. It enables the surface impedance of single and multiple layers of absorbent to be calculated. For instance, it enables the case of a rigidly backed porous absorbent to be considered.

28, consider the most common case which is a rigidly backed single layer. In this case, zsi ! 6 ki cotðkxi di Þ kxi ð1:29Þ Absorption for pipes and ducts – porous absorber characteristics Air conditioning ducts and other pipelines are a common source of noise [11]. Breakout noise radiates from the sides of the pipelines and ducts. The most effective treatment will be to reduce the noise at the source, but where this is not possible, application of absorbent within or external to the duct can be effective.

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