Optimum Design of Multi-layered Micro-perforated Panel Sound Absorbers in Combination with Porous Materials in an Arbitrary Frequency Range

Abstract

modern life [1][2][3][4][5]. Control of noise, especially, in three frequency ranges, e.g. low-frequency (20 Hz-500 Hz), mid-frequency (500 Hz-2000 Hz), and high-frequency (2000 Hz-10000 Hz) is important [6][7][8][9]. Porous materials [10] are the most applicable types of sound absorbers