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Université de Technologie de Compiègne |
Journal articles
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.
Cited literature [23 references]
https://hal.utc.fr/hal-02180353
Contributor : Solène Moreau <>
Submitted on : Thursday, July 11, 2019 - 2:01:58 PM
Last modification on : Saturday, July 13, 2019 - 1:24:11 AM
Contributor : Solène Moreau <>
Submitted on : Thursday, July 11, 2019 - 2:01:58 PM
Last modification on : Saturday, July 13, 2019 - 1:24:11 AM
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baccouche2017.pdf
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