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Vibroacoustic properties of thin micro-perforated panel absorbers
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10.1121/1.4733555
/content/asa/journal/jasa/132/2/10.1121/1.4733555
http://aip.metastore.ingenta.com/content/asa/journal/jasa/132/2/10.1121/1.4733555
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) A cavity-backed MPP absorber with a flexible boundary surface; (b) particle velocity distribution in relation to the panel velocity and the air particle velocity averaged over each hole.

Image of FIG. 2.
FIG. 2.

(Color online) Schematic and picture of the experimental set-up used for measuring the input impedance and absorption coefficient of the MPPA.

Image of FIG. 3.
FIG. 3.

Sound absorption coefficient of a thin MPPA: predicted assuming a rigid (gray) or an elastic (black) MPP; measured using the two-microphones method (circles).

Image of FIG. 4.
FIG. 4.

Phasor representation of the input impedance of a thin MPPA: predicted assuming a rigid (bold gray) or a flexible (bold black) panel; measured using the two-microphones method (circles). Circles of constant absorption coefficient (thin black).

Image of FIG. 5.
FIG. 5.

(Color online) Schematic and picture of the experimental set-up used for measuring the disk vibrating response of the MPPA using a laser scanning vibrometer.

Image of FIG. 6.
FIG. 6.

(Color online) Measured vibrating response of the MPPA disk in relation with local maxima of the sound absorption coefficient. Comparison with the velocity predicted at the resonance frequencies of the panel-cavity volume displacing modes.

Image of FIG. 7.
FIG. 7.

Phase difference curves between the panel averaged velocity and the air particle velocity induced by the incident wave in the MPP holes: predicted from Eq. (15) (solid gray); from Kundt’s tube measurements and Eq. (15) (circles); from LSV mobility and acoustic transfer function measurements (dashed).

Image of FIG. 8.
FIG. 8.

Simulation results on the influence of the perforation ratio on the sound absorption coefficient of a rigid (gray) or flexible (black) MPP absorber: (solid); (dashed); (dash-dotted).

Image of FIG. 9.
FIG. 9.

Influence of the normalized perforation ratio on the first PC-controlled (solid) and HC-controlled (dashed) resonant frequencies of a thin MPPA: coupled mode analysis (gray) and vibro-acoustic model (black). Thin reference curves: HC resonance (dashed); first PC resonance (solid); and first panel resonance (dash-dotted). Upper (squares) and lower (circles) measured resonance frequencies.

Image of FIG. 10.
FIG. 10.

Experimental results on the influence of the cavity depth on the sound absorption coefficient of a flexible MPPA (): (crosses); (circles); (dotted); (dash-dotted); (solid); (gray).

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/content/asa/journal/jasa/132/2/10.1121/1.4733555
2012-08-08
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Vibroacoustic properties of thin micro-perforated panel absorbers
http://aip.metastore.ingenta.com/content/asa/journal/jasa/132/2/10.1121/1.4733555
10.1121/1.4733555
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