The vibrating MPP-cavity-flexible panel system.
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).
(Color online) Experimental setup for the determination of the absorption and transmission properties of the insulating MPPCP partition.
Transmission loss of a clamped MPPCP partition under normal incidence: modal approach ( scaled: black solid; scaled: black dashed); experiment ( scaled: gray solid).
The absorption coefficient of a clamped MPPCP partition under normal incidence and scaled on : modal approach (black solid); experiment (gray solid).
Mechanical equivalent model of an elastic MPP-cavity-panel partition.
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.
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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