Figure 6
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Sound absorbing coefficients at normal incidence of 30 mm thickness melamine foam samples: Comparison between measurements (orange filled zone), characterization [8, 9] (blue dashed line), mono-sized model [4] (black line), 3-parameter model [26] (green line), and poly-sized model [this work] (red filled zone with full line). The poly-sized model curves are calculated by using the computed macroscopic parameters (Tab. 1), uncertainties determined by considering an error of 5% on the measured pore size D.
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