09.07.2011
A numerical method to study the influence of the three-dimensional geometrical features of porous polymeric foam on its sound absorbing behavior
Vortrag bei Automotive Acoustics Conference 2011
1. Internationale ATZ-Fachtagung mit Autoneum
(vormals Rieter Automotive Systems)
NVH von Materialien, Komponenten und Systemen I
Referent(in): Mark Brennan, Jan Vandenbroeck, Thomas Joncheray, Huntsman Polyurethanes, Belgium
Porous absorbers are widely used for sound and vibration dampening applications in automotive, construction and industrial sector. The physical phenomena involved with energy dissipation of sound waves propagating through foam are dependent upon the polymer and the specific microstructure of the foam. This leads to complex frequency dependent acoustic macroscale properties that are difficult to interpret from the point of view of a chemical formulator not expert in the field of foam acoustics.
Classically the wave propagation through porous materials is described by either biphasic models, equivalent fluid or equivalent solid models. This paper will present a numerical approach based on micro-CFD which links the microstructure of the open cell porous material to acoustic performance. The influence of mean cell size, polydispersity, foam density and degree of cell opening on the sound absorption is shown. The results of this approach are compared with and used to interpret impedance tube measurements. It is shown that this approach opens the route to novel material development and to new characterization methods and material models.
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