Ultra-broadband highly efficient sound absorption of MPP-TPMS composite acoustic metamaterial with multi-stage impedance matching

Abstract

Broadband and low-frequency noise control is highly demanded in advanced engineering fields such as aerospace and precision manufacturing. However, traditional sound-absorbing materials struggle to balance lightweight, high strength, and excellent low-frequency dissipation. In this paper, a novel ‘micro-perforated panel-gyroid’ composite multifunctional acoustic metamaterial is proposed. First, the theoretical framework was established by coupling the Johnson–Champoux–Allard (JCA) equivalent fluid model with the transfer matrix method to predict the acoustic properties of cascade structures. To overcome the low-frequency limits of pure Gyroid lattices, a cascaded MPP-air cavity configuration was developed, with its non-convex impedance parameters globally optimized using particle swarm optimization. The optimized results show that the effective absorption band is significantly broadened to 260–4610 Hz, with an average absorption coefficient of 0.93. Furthermore, by establishing a four-stage parallel array system optimized across sub-bands, the local Fabry–Perot resonance valleys were flattened utilizing transverse evanescent wave coupling at the fluid-solid interface. Ultimately, effective broadband sound absorption was achieved across an ultra-broadband range of 10–6000 Hz. This study elucidates the multi-scale acoustic energy dissipation mechanism of ‘low-frequency long-range penetration and high-frequency shallow interception,’ providing a new theoretical framework and engineering paradigm for the sophisticated design of load-bearing acoustic metamaterials.