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Article Dans Une Revue Journal of the Acoustical Society of America Année : 2010

A mode matching method for modeling dissipative silencers lined with poroelastic materials and containing mean flow

Benoit Nennig
Emmanuel Perrey-Debain
Mabrouk Ben Tahar
  • Fonction : Auteur

Résumé

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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Dates et versions

hal-00694671 , version 1 (05-05-2012)

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Benoit Nennig, Emmanuel Perrey-Debain, Mabrouk Ben Tahar. A mode matching method for modeling dissipative silencers lined with poroelastic materials and containing mean flow. Journal of the Acoustical Society of America, 2010, 128 (6), pp.3308-3320. ⟨10.1121/1.3506346⟩. ⟨hal-00694671⟩
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