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Updated: Jun 5, 2026

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
Published on: June 28, 2024
A mode matching method for modeling dissipative silencers lined with poroelastic materials and containing mean flow
Benoit Nennig1, Emmanuel Perrey-Debain, Mabrouk Ben Tahar
1Laboratoire Roberval UMR 6253, Acoustics Department, Centre de Recherches de Royallieu, Université de Technologie de Compiègne, BP 20529, 60205 Compiègne cedex, France. benoit.nennig@utc.fr
Abstract:
A mode matching method for predicting the transmission loss of a cylindrical shaped dissipative silencer partially filled with a poroelastic foam is developed. The model takes into account the solid phase elasticity of the sound-absorbing material, the mounting conditions of the foam, and the presence of a uniform mean flow in the central airway. The novelty of the proposed approach lies in the fact that guided modes of the silencer have a composite nature containing both compressional and shear waves as opposed to classical mode matching methods in which only acoustic pressure waves are present. Results presented demonstrate good agreement with finite element calculations provided a sufficient number of modes are retained. In practice, it is found that the time for computing the transmission loss over a large frequency range takes a few minutes on a personal computer. This makes the present method a reliable tool for tackling dissipative silencers lined with poroelastic materials.
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