Sound insulation mechanism and prediction of membrane-type acoustic metamaterial with multi-state anti-resonances by weighted-kNN

Abstract In this study, we present a swing-arm type membrane-type acoustic metamaterial (MAM) with multi-state anti-resonances. The designed structure is lightweight and can achieve excellent sound insulation in a wide frequency range of 100–1000 Hz. Through the analysis of sound transmission loss and anti-resonance mode, the sound insulation principle of MAM is obtained. Besides, the orthogonal experiment presents the order of the main factors affecting the sound insulation performance. Based on the relative bandwidth as the classification criterion, k-nearest neighbor with analytic hierarchy process and K-Fold cross-validation is utilized to predict different levels of sound insulation.