Sound Absorption Characteristics of Corrugated Microperforated Panels with Phase-Controlled Shapes

This study aims to investigate the sound absorption characteristics of corrugated microperforated panels (CMPPs) with different phase-controlled surface profiles under normal sound incidence in applications with limited installation space. The surface profile of the unidirectional periodic CMPP adopts a sinusoidal curve, and its shape is controlled by phase values of ϕ = 0 or ϕ = π/2. A three-dimensional numerical model based on the finite element method is established to predict the sound absorption coefficient, and is validated experimentally to ensure the accuracy of the simulation results. To overcome structural size limitations, an enlarged numerical model is employed in the simulations. In addition, modal analysis is performed to investigate the mechanisms governing the differences in sound absorption characteristics among different CMPP configurations. A parametric study is also conducted. The results show that CMPP( ϕ = 0) exhibits superior sound absorption performance in the mid-frequency range to CMPP (ϕ = π/2). Modal analysis further reveals that more non-resonant modes are excited in CMPP (ϕ = 0), enhancing energy dissipation and contributing to improved sound absorption at the minimum absorption region of the curve compared with CMPP (ϕ = π/2). Moreover, within a single corrugation period, the performance advantage of CMPP (ϕ = 0) becomes more pronounced as the corrugation depth increases. The CMPP with ϕ = 0 offers an effective approach to enhancing broadband sound absorption without increasing material usage. This configuration is particularly suitable for noise control applications in space-limited environments.