Integral sound absorption performance of micro-perforated panel absorbers under coupling of porosity and hole diameter

The coupling of the geometric parameters of micro-perforated panels and its influence on the integral sound absorption performance of the absorbers can guide the design and optimization of micro-perforated panels.According to the basic theory of micro-perforated panel absorbers,the coupling of the porosity and hole diameter and its effect on the sound absorption performance are researched.The coupling between the porosity and hole diameter is closely related to the value of each other,having no obvious relationship with the panel thickness and cavity depth.In the porosity-hole diameter domain,the absorber has an absorption peak with absorption coefficient of 1.0.Therefore the integral sound absorption performance shows a trend of initial increase and then decrease with the porosity or hole diameter changing from small to large.The conclusion can accurately explain the variation law and evolution path of the sound absorption performance when dust pollution occurs to the panels.The work in the paper provides a new theoretical basis and implementation method for designing the sound absorption performance of micro-perforated panel absorbers.