Test of single degree of freedom acoustic treatment impedance models for multimodal acoustic propagation in duct with flow

Abstract : Passive acoustic treatments, also called liners, are the main solution to noise problems. The Single Degree Of Freedom (SDOF) acoustic treatment, composed of a thin material (perforated plate) affixed to air cavities with a rigid bottom, constitutes a solution. Predicting sound level reduction by an SDOF treatment requires reliable acoustic impedance models. An experimental/numerical method has been developed for a duct with an acoustic treatment to test acoustic impedance models of SDOF treatment with a multimodal propagation in the presence of a mean flow. This method is based on the comparison of experimental results from an aeroacoustic bench composed of a circular duct with a treated area, and numerical results from an FEM-PML axisymmetric model based on Galbrun's equation. The numerical results are confronted with experimental results to test impedance models up to M 0 ¼ 60:25.
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Ryan Baccouche, Solène Moreau, Mabrouk Ben Tahar. Test of single degree of freedom acoustic treatment impedance models for multimodal acoustic propagation in duct with flow. Journal of the Acoustical Society of America, Acoustical Society of America, 2017, 141 (6), pp.4168-4178. ⟨10.1121/1.4983653⟩. ⟨hal-02180353⟩

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