By Helmut V. Fuchs
The writer supplies a finished evaluation of fabrics and elements for noise regulate and acoustical convenience. Sound absorbers needs to meet acoustical and architectural requisites, which fibrous or porous fabric by myself 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 execs will locate a few new simple ideas and instruments for advancements with a purpose to increase acoustical convenience. Interference absorbers, energetic resonators and micro-perforated absorbers of other fabrics and designs entire the record of applications.
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Additional info for Applied Acoustics: Concepts, Absorbers, and Silencers for Acoustical Comfort and Noise Control: Alternative Solutions - Innovative Tools - Practical Examples
Engine compartments or under the floor section of motor vehicles), in the latter case also with an additional function as a “heat shield” to prevent heat being conveyed into the passenger compartment. Weight and space play an important role in portable encapsulations of loud devices, which moreover lead to limiting their effectiveness at low frequencies. On the other hand, in immobile 26 3 Sound Absorption for Noise Control and Room-Acoustical Design Fig. 5 Anechoic encapsulation of peripheral elements of technical sound sources, such as engines in acoustic test cells, see Chap.
In anechoic acoustic test cells (see Chap. 12), encapsulations, such as shown in Fig. 5, can also be designed so absorbent for sound waves impinging from the outside that they hardly disturb the freefield conditions of the room for the to-be-tested sound sources. 10 Damping of Structure-borne Sound A subject matter of this book is absorbers and silencers for airborne sound in all its forms. It stems, apart from the aerodynamic sources such as for example the human voice, wind instruments or fans, in many cases from vibrating elements, for example sounding boards of string and percussion instruments or housings of machinery.
24) does not depend on the size SK of the closed encapsulation but strongly on the equivalent absorption area AK , respectively the average absorption coefficient αK of its inner cladding. Mechanically and chemically highly resistant absorptive cladding is of use in rooms that are strongly flowed through or very grimy. Recommendable are porous glass foam according to Sect. g. in engine rooms) and microperforated surfaces according to Sect. g. engine compartments or under the floor section of motor vehicles), in the latter case also with an additional function as a “heat shield” to prevent heat being conveyed into the passenger compartment.