Customized sound mitigation with micro-perforated panels

Micro-perforated panels in combination with an air-tight cavity volume constitute the microperforated absorber (MPA), an alternative means in the category of sound absorbing (meta)materials. In contrast to the conventional porous and fibrous materials, the MPA does not mitigate sound in broad frequency range, but rather has to be customized to a specific noise frequency range. In this contribution, we show the influence of two types of MPP and various cavity setups on the absorption and reflection of the impinging sound power. Application examples demonstrate the advantages and disadvantages of using MPAs in room acoustic scanarios. The investigations found that the MPA's effectiveness strongly depends on the sound field characteristic and that the MPA setup influences the different portions (absorption, reflection and transmission) of the impinging sound wave differently.