Applied Acoustics: Concepts, Absorbers, and Silencers for by Helmut V. Fuchs
By Helmut V. Fuchs
The writer supplies a complete assessment of fabrics and elements for noise regulate and acoustical convenience. Sound absorbers needs to meet acoustical and architectural requisites, which fibrous or porous fabric on my own can meet. fundamentals and purposes are proven, with consultant examples for spatial acoustics, free-field try out amenities and canal linings. Acoustic engineers and building pros will locate a few new easy innovations and instruments for advancements which will enhance acoustical convenience. Interference absorbers, energetic resonators and micro-perforated absorbers of other fabrics and designs entire the checklist of applications.
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Extra resources for Applied Acoustics: Concepts, Absorbers, and Silencers for Acoustical Comfort and Noise Control: Alternative Solutions - Innovative Tools - Practical Examples
There is therefore an urgent need for the development of new tools, materials and construction elements to efficiently absorb sound energy in this important frequency range, see Chaps. 5–8. To achieve this goal, it is necessary to first derive suitably adjusted measuring and calculation procedures. g. Sects. 10. References Bies DA, Hansen CH (1996) Engineering noise control. E & FN Spon, London CD-ROM (1998) Ausschnitte aktueller Themen. Fraunhofer IBP, Stuttgart Cremer L, Müller HA (1974) Die wissenschaftlichen Grundlagen der Raumakustik, vol II.
6. Despite a few limitations regarding the practical realization of homogeneous, finely structured layers, the solid curves in Fig. 2 can be used for comparison as reference curves for diffuse, respectively the dash-dotted curves for normal sound incidence, even if the materials and assemblies of a given thickness may structurally differ. 1 Fibrous Materials The absorbers discussed here, preferably and predominantly made of synthetic mineral fibers, are called passive absorbers, because they—despite their generally very low specific weight ρA ≈ 30–150 kg m−3 —are practically not excitable by sound waves.
As streamlined preformed elements, these porous absorbers can, for example, be attached to turning vanes in the corners of large air ducts. 2 Open-pore Foams 37 Fig. 5 m high bending silencer of a wind tunnel (left) with membrane absorbers according to Sects. 4 and guiding vanes (right) aerodynamically optimized with layers of foam. (See Eckoldt and Fuchs 1995) Fig. 5 m long profiles according to Fig. 5, foam uncoated ( ); foam coated (◦); same-length straight 100 mm thick splitters with a 500 mm spacing (✷) have been exposed to adjacent velocities of up to 137 km h−1 (38 m s−1 ) since 1993 without any signs of abrasion or aging (Fig.