Abstract
THE INFLUENCE OF AN ISOLATED ACOUSTIC RESONATOR WITH A CROSS-SHAPED SLIT ON SOUND ABSORPTION/VIENETINIO KRYŽIAUS FORMOS AKUSTINIO REZONATORIAUS TŪRIO KITIMO ĮTAKA GARSO ABSORBCIJAI
Highlights
The paper deals with the dependence of the sound absorption of an isolated acoustic resonator with a cross-shaped slit between the planes
The elasticity of air is determined by the air volume and height, while the fluctuating air mass is determined by the air in the hole and the added air mass characterised by the radiation impedance
When the air elasticity is equal to the fluctuating air mass, a resonance takes place
Summary
Vienetinio kryziaus formos akustinio rezonatoriaus garso absorbcija apskaiciuojama pagal formul~: A. cia p0 - oro tankis; c0 - garso greitis ore; Sr- rezonatoriaus plotas; Zr - rezonatoriaus spinduliavimo impedansas; Zm - paties plysio impedansas. Integruojant nuo 0 iki oo menamoji spinduliavimo impedanso dalis bus lygi: Im Z r k 2 s2 f21td r+oosin 2[klcosq>coshu] =poc4o7-t2- r Jl0 I.J>jl0 k 2l 2 cos 2cosh u] k 2d 2 sin 2 q>cosh 2 u (8). Staciakampes formos plysio D 1 spinduliavimo kryptingumo diagrama apskaiciuojama pagal formul~:. StaCiakampes formos plysio D2 spinduliavimo kryptingumo diagrama apskaiciuojama pagal formul~: D-, = sin[ka sin ysin
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