When one is looking to improve of sound attenuation / sound insulation performance of an existing enclosure (acoustic hood) or of an existing wall, ITS offers a wide range of viscoelastic materials for all applications related to acoustic insulation / soundproofing related to the protection of workers against noise, preservation of acoustic environment, limitation of noise emissions in the energy sector, testing rooms acoustics.
In this field, the major interest of a viscoelastic material (as its name suggests: having both viscous and elastic properties - when they undergo deformation -) consists in making it possible to obtain composite walls with vibroacoustic properties [1] significantly modified compared to those of a basic metal plate, as can be modeled (by means of an equivalent plate concept) with the CODAP calculation routine [2] of Module 2 of the SILDIS® software [3 ]:
- two-layer composite: combining a damping material and a base plate; we then speak of extensional damping: the elasticity of such a partition does not depend on the frequency
- for - opaque - metal constructions e.g. machine carterizations and sound-enclosures (the base plate is often in steel, or in aluminum)
- for associations with wooden and/or plaster (gypsum) panels (e.g. for the construction of audiometric booths or of booths for musicians, of partitions and movable walls)
- three-layer composite: combining a damping material - inside - and two base plates - external - (the whole constituting what is commonly called, by culinary analogy, a sandwich); we then speak of constrained damping: the elasticity of such a wall depends on the frequency
- for opaque constructions (often metallic) in steel, aluminum e.g. cladding of bins in which metal parts are poured
- for translucent constructions: made of glass in the case of laminated glazing
ITS offers viscoelastic materials for noise control, acoustic insulation in building, industry to allow the construction of noise-reducing enclosures, having means making it possible to model the performance (in terms of sound reduction index) of the multilayer partitions thus formed, possibly associated with other layers to form double-leaf or triple-leaf walls.
[1] Young's modulus, density, Poisson's ratio, loss factor (intrinsically very high for a visco-elastic material)
[2] Acronym for "COmputation of Damped Plates"
[3] Prediction of acoustic performance of plane partitions and walls - software SILDIS® Module 2 / 2+
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