Under certain conditions, porous materials used for noise abatement need to be shaped to satisfy architecture constrains as for corrugated sheets. Moreover, it may be used to increase the material performance. For instance, wedge shape is used to increase the sound absorption properties at low frequencies. It was earlier demonstrated that the performances of this type of materials could be reproduced by representing the wedge as a series of perforated layers, each of them being modelled using the double porosity theory (see Figure 1).
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