Abstract
A composite structure (L‐LDMPP) consisting of localized aluminum foam, a localized microperforated plate (MPP), and a double‐layer MPP is proposed to enhance sound absorption. A simulation model using COMSOL is developed to predict the sound absorption coefficient and investigate the acoustic benefits of localized aluminum foam and localized MPP. A comparative analysis is performed to evaluate the sound absorption performance of four configurations: L‐SMPP (localized aluminum foam with a single‐layer MPP), L‐DMPP (localized aluminum foam with a double‐layer MPP), L‐LSMPP (localized aluminum foam with a localized MPP and a single‐layer MPP), and L‐LDMPP (localized aluminum foam with a localized MPP and a double‐layer MPP). The model's accuracy is validated against experimental data. Results show that localized aluminum foam, localized MPP, and double‐layer MPP optimize acoustic impedance matching. The sound absorption characteristics of L‐LDMPP are divided into two domains: the resonance acoustic domain, influenced by the double‐layer MPP structure behind the localized aluminum foam, and the coupled acoustic domain, influenced by both the localized aluminum foam and localized MPP.
Published Version
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