Schallabsorption und Schalldämmung, Messung, Auslegung

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Sound absorption and sound insulation

With respect to the measurement of acoustic material properties – especially the sound absorption and the sound insulation – the Gesellschaft für Akustikforschung Dresden mbH offers you a wide range of services.

These parameters can be applied to design and to optimize the acoustic efficiency of multi-layer absorbers as well as silencers and mufflers.

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Measurement of sound absorption coefficient, sound insulation etc.

measurement of the sound absorption coefficient, the surface impedance and the sound reflection factor of small material samples in the impedance tube AcoustiTube^® (Kundt`s tube) according to DIN EN ISO 10534-2, ASTM E1050 and VW Test specification PV 8223

measurement of the sound insulation (transmission loss), the transmission coefficient, the complex absorber parameter (wave number / propagation constant, characteristic impedance) of small samples porous sound-absorbing material in the transmission tube AcoustiTube^® by using the Transfer-matrix method according to ASTM E2611

determination of the sound absorption coefficient of large material samples in the reverberation chamber according to DIN EN ISO 354

determination of the sound absorption coefficient of small material samples in the Alpha cabin in the sense of DIN EN ISO 354 as well as according to BMW Test specification PR 353.4 and PR 11737646

determination of the sound absorption coefficient and the complex surface impedance in situ according to DIN ISO 13472-1 with sound absorption measuring system AcoustiAdrienne and according to DIN ISO 13472-2 with impedance tube AcoustiTube^®

measurement of spectral sound insulation / transmission loss of big components in the test setup for windows according to DIN EN ISO 10140-2; rating according to DIN EN ISO 717-1

measurement of spectral sound insulation / transmission loss of smaller components and materials in the test setup for windows with reduced dimensions in the sense of DIN EN ISO 10140-2; rating according to DIN EN ISO 717-1

measurement of spectral sound insulation / transmission loss and insertion loss of small plate-shaped specimens in the chamber test setup on the basis of DIN EN ISO 10140-2

Optimization of sound absorbers and mufflers

calculation of the sound propagation (sound absorption, sound reflexion, sound insulation) above layered absorbers by applying different absorber models (e. g. homogeneous model, phenomenological model) with sound absorber software AcoustiCalc^{® Absorber}

prediction and optimization of the sound absorption in mufflers and silencers as well as absorbent-lined ducts by both analytical models with muffler software AcoustiCalc^{® Silencer} and by numerical calculation (see FEM)

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