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Sound absorption and transmission through flexible micro-perforated panels backed by an air layer and a thin plate
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View: Figures


Image of FIG. 1.
FIG. 1.

The vibrating MPP-cavity-flexible panel system.

Image of FIG. 2.
FIG. 2.

Comparison of the (a) predicted transmission loss and (b) reflection coefficient for three steel-made finite partitions: double panel (black dashed), MPP-air cavity-back panel (black solid), and the back panel alone (gray solid).

Image of FIG. 3.
FIG. 3.

(Color online) Experimental setup for the determination of the absorption and transmission properties of the insulating MPPCP partition.

Image of FIG. 4.
FIG. 4.

Transmission loss of a clamped MPPCP partition under normal incidence: modal approach ( scaled: black solid; scaled: black dashed); experiment ( scaled: gray solid).

Image of FIG. 5.
FIG. 5.

The absorption coefficient of a clamped MPPCP partition under normal incidence and scaled on : modal approach (black solid); experiment (gray solid).

Image of FIG. 6.
FIG. 6.

Mechanical equivalent model of an elastic MPP-cavity-panel partition.

Image of FIG. 7.
FIG. 7.

Influence of the (a) perforation ratio and (b) MPP thickness on the first three resonance frequencies of a clamped MPPCP layout: MPP perturbed resonance (theory: light gray solid, modal: light gray dots); back panel perturbed resonance (theory: gray solid, modal: gray dots); Helmholtz fully coupled resonance (theory: black solid, modal: black dots), and Helmholtz classical resonance (black dashed); the measured resonance frequencies are plotted as black squares.

Image of FIG. 8.
FIG. 8.

Modulus (top) and phase (bottom) of measured average velocities associated with the MPP (, black dashed), the air particles flowing through the MPP holes (, gray solid), and the back panel (, black solid) around (a) the second and (b) the third resonance frequencies of the MPPCP partition, and , respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Sound absorption and transmission through flexible micro-perforated panels backed by an air layer and a thin plate