Engineering-oriented design strategy to obtain linear micro-perforated panel absorbers at high sound pressure environment

Abstract

The nonlinear effect at high sound intensity not only degrades the absorption performance of a micro-perforated panel (MPP) absorber, but also makes its performance prediction and structure design become difficult and unreliable due to the absence of accurate nonlinear impedance models. Hence, it is desirable to develop a linear MPP absorber. Based on this, this paper presents an investigation on an engineering-oriented design method of a linear absorber according to practical needs for a specific high sound pressure level (SPL) application. The strategy actually involves a reverse design method and process and the output is a set of structure parameters that uniquely determine an MPP absorber. The input is the characteristic parameters of an MPP absorber which are associated with environment parameters, such as the most undesirable frequency and the maximum SPL. Firstly, the detailed process of design for a linear MPP absorber is expatiated in this study. Then a concrete design example based on the current approach is present and finally, the reliability of the design results is validated by experiment. This study provides a new thought and method for the effective application of MPP absorbers in high SPL environments.