Title: Estimation of geometric parameters for micro-perforated panels and their effects on sound absorption performance

Author(s): WANG Weichen; XING Bangsheng; GU Haixia; MA Ran

Affiliation(s): School of Mechatronic Engineering, Jiangsu Normal University; School of Education Intelligent Technology, Jiangsu Normal University

Abstract: The geometric parameters of micro-perforated panels with irregular holes cannot be directly known, making it difficult to calculate the sound absorption performance. Therefore,we propose a method of estimating the geometric parameters of micro-perforated panels. The irregular holes are treated as equivalent circular ones, and the model of estimating the geometric parameters is established by using Maa’s theory about the panel with circular holes. The result of the parameter estimation of a type of micro-perforated panel is used to predict the absorption performance, resulting in good agreement with experiments. According to the influences of the geometric parameters of the panel on the high absorption region, we discuss the relationship between the application limit of Maa’s theory and the geometric parameters, and investigate the evolution law of the sound absorption performance when the panel is polluted by dust. If the parameters of the panel are designed near the center of the high absorption region, large value of the application limit of Maa’s theory can be obtained; and if the parameters are located in the upper right part of the high absorption region, a certain degree of dust pollution of the panel does not decrease the sound absorption performance.