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A Wave Based Model to Predict the Niche Effect on Sound Transmission Loss of Single and Double Walls

Tijdschriftbijdrage - Tijdschriftartikel

In building acoustical laboratories, the sound transmission loss (STL) of building elements is typically measured on the element as mounted in the frame of an aperture. It is known that the specific positioning of the specimen in the frame may affect the results due to the niche effect. In this paper, a wave based model is used to numerically investigate the niche effect on the STL of single and double walls. The field variables (plate displacements and sound pressures) are expanded in terms of structural and acoustic wave functions. The model is validated with experimental results of a lightweight single wall. A parametric study for single and double glazing shows that the position of the wall in the opening and the depth of the niche can significantly influence the STL below coincidence. As for single walls, the STL of double walls is minimal when placed in the center of the niche opening and maximal for the edge positions. The niche effect, however, is larger for double walls in the midfrequency range, where sound transmission is highly dependent on the angle of incidence. Typically, the niche effect leads to a less pronounced, but broader coincidence dip. Furthermore, it is shown that the niche effect can be reduced by the use of a staggered niche. © S. Hirzel Verlag · EAA.
Tijdschrift: Acta Acustica United with Acustica
ISSN: 1610-1928
Issue: 1
Volume: 98
Pagina's: 111 - 119
Jaar van publicatie:2012
BOF-keylabel:ja
IOF-keylabel:ja
BOF-publication weight:0.1
CSS-citation score:1
Authors from:Higher Education
Toegankelijkheid:Open