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Old 24-04-2009, 06:27 PM   #11
DeMa
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Default Re: Perforacija, matrica...?

Evo formule ako zelis kupiti nesto gotovo.

imas nekoliko razliciti nacina tome prestupiti. sto se tice materijala.
Ako zelis buszit rupe onda ti je to ubit Helhotz absorber.

http://www.schall-isolierung.de/cms/...lochblech.html

evi ti jedna stranica kako bi to moglo izgledati.


a formula sljedi u biti je formula helmhotza, ali se uzima procentualna preforacija.
Ali ima super rjesenje ako imas priliku mozes uzeti akkustik deku od naprimjer knaufa koji tocno taj princip koriste. Ako sam pogodio temu razjasnit cu formulu, jer nisam siguran, onda se javi.

pozz
Denis
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