Acoustic performance optimization of natural-fiber micro-perforated panels backed by an optimized polyurethane-fibrogranule composite.

Regression coefficients and factor significance The full quadratic model’s ANOVA (Table 4 ) revealed a highly significant overall fit (F = 15.29, p < 0.0001), with R2 = 0.934, adjusted R2 = 0.879, and predicted R2 ≈ 0.65.

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This gain, although modest in relative terms, is practically significant, as it stems from the synergistic integration of Helmholtz resonance and enhanced visco-thermal dissipation.

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