Structural and Geometric Enhancements of Microperforated Panel Absorbers: A Systematic Literature Review

Abstract

This systematic review analyses sixty-one recent studies on structural and geometric enhancements of microperforated panel (MPP) absorbers, consolidating them into two primary categories: cavity structural strategies and panel modifications. Cavity-related approaches include multilayer, multi-depth, folded, and partitioned designs, while panel-related strategies address perforation geometry, distribution, and surface profiling. Hybrid designs that integrate both approaches are acknowledged but not the focus of this study. Comparative analysis indicates that cavity-related enhancements are particularly effective in extending sound absorption into low frequencies, whereas panel modifications provide greater flexibility for tuning absorption peaks and achieving compact broadband performance. Cross-category comparisons reveal performance trade-offs and clarify the structural solutions most suitable for engineering applications such as built environments, transportation systems, and enclosed technological spaces. The review establishes a structured overview of MPP absorber design strategies, highlighting current trends, limitations, and opportunities for future development. The synthesis not only provides design guidance for absorbers with improved low-frequency and broadband performance but also situates MPPs within the broader landscape of acoustic materials and engineering technologies