Equivalent circuit model for the TL through a panel. The panel is modeled with a T-network waveguide circuit to account for resonances in the thickness of the panel.
(Color online) Photograph of the experimental set-up in the anechoic chamber with the polycarbonate plastic partition in place and the lowest frequency ultrasonic source. The edges of the partition are outlined to make it more visible to the viewer.
(Color online) IL vs frequency plots for the three materials tested: (a) Polycarbonate plastic, (b) MDF, and (c) galvanized steel. Measured data are compared to normal-incidence, mass-law TL, and loss predicted by the circuit model (dashed lines). Measurements made with the low, mid, and high frequency sources are denoted by circles, diamonds, and squares, respectively.
Dimensions and parameters of the ultrasonic sources used in this study.
Physical dimensions and properties of the partitions tested.
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