Comparison of multiple-layer versus multiple-cavity microperforated panels for sound absorption at low frequency

• Pedro Cobo ^[1] ; Francisco Simón ^[1] ; Carlos Colina ^[1]
  1. [1] CSIC
• Localización: Noise Control Engineering Journal, ISSN 0736-2501, Vol. 69, Nº. 4, 2021, págs. 341-350
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • 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.