Improving acoustic absorption modeling of additively manufactured microperforated panels through kriging-based approaches

Microperforated panels (MPPs) have emerged as good acoustic absorbers, with the Maa model being commonly utilized for predicting their acoustic absorption and impedance. However, discrepancies arise when applying this model to MPPs fabricated through additive manufacturing. Additive manufacturing offers design flexibility, but it challenges traditional acoustic models by not achieving ideal geometric characteristics. For instance, non-circular perforations resulting from the additive manufacturing, deviate from the perfect circular shape assumed in the Maa model. This non-ideal geometry poses challenges in predicting MPP acoustic absorption, particularly at lower frequencies and in wideband scenarios. Microscopic examinations reveal microporosity within panel solids, adding complexities not usually accounted for by models assuming a solid structure around perforations. This study investigates the observed disparity between Maa model predictions and experimental results due to manufacturing defects, microporosity within the MPPs and panel vibration. We address these challenges by introducing Kriging, a spatial interpolation technique, to refine the absorption model. The Kriging model demonstrates remarkable agreement with experimental data, offering a more accurate representation of the acoustic performance of additively manufactured MPPs. The proposed methodology not only contributes to advancing the understanding of acoustic absorption in MPPs but is also promising for optimizing their performance in real-world applications.