Abstract
Consistent with the historical development of sound absorbers, focus in Chap. 4, the first chapter on the fundamentals of sound absorbers, was on passive absorbers. Due to their market dominance, they also predominate in all the standard literature on absorbers and silencers. When combined with conventional foil facings as air-tight protective layers against abrasion, their mass should not exceed a certain limit according to Eq. (4.11) in order to impede as little as possible sound entering the porous material, the actual absorber. Section 6.2 will describe how a very effective broadband absorber for medium frequencies can be produced with only a partial, for example slotted rigid panel covering a porous or fibrous material densely packed behind the entry slots. The present chapter will deal with reactive absorbers which encounter the sound field with an impermeable layer whose mass m″ per unit area is not small but very large compared to the air mass moved with the sound wave according to Eq. (3.2). Such a mass is only able to react with the sound field if rendered excitable as part of a resonance system.
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Fuchs, H.V. (2013). Panel Absorbers. In: Applied Acoustics: Concepts, Absorbers, and Silencers for Acoustical Comfort and Noise Control. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-29367-2_5
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