Resumen de Comparison of multiple-layer versus multiple-cavity microperforated panels for sound absorption at low frequency
Pedro Cobo, Francisco Simón, Carlos de la Colina Tejeda
Microperforated panels (MPPs) are recognized as suitable absorbers for noise control applications demanding special clean and health requirements. While it is relatively easy to design single-layer MPPs for sound absorption in one-to-two octave bands at medium-high frequencies, the performance for low frequencies (below 600 Hz) leads to a rather narrowband absorption, similar to that of a Helmholtz resonator. However, multiple-layer MPPs can be designed as sound absorbers that yield low-frequency absorption in a wide frequency band. Recently, multiplecavity perforated panels have been proposed to improve the performance of MPPs in the low-frequency range. In this article, the capability of multiple-layer and multiple-cavity MPPs to provide sound absorption at low frequencies is analyzed. © 2021 Institute of Noise Control Engineering.
