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

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  • معلومة اضافية
    • Contributors:
      Roberval (Roberval); Université de Technologie de Compiègne (UTC)
    • بيانات النشر:
      HAL CCSD
      Acoustical Society of America
    • الموضوع:
      2017
    • Collection:
      Université de Technologie de Compiègne: HAL
    • نبذة مختصرة :
      International audience ; 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.
    • Relation:
      hal-02180353; https://hal.utc.fr/hal-02180353; https://hal.utc.fr/hal-02180353/document; https://hal.utc.fr/hal-02180353/file/baccouche2017.pdf
    • الرقم المعرف:
      10.1121/1.4983653
    • الدخول الالكتروني :
      https://hal.utc.fr/hal-02180353
      https://hal.utc.fr/hal-02180353/document
      https://hal.utc.fr/hal-02180353/file/baccouche2017.pdf
      https://doi.org/10.1121/1.4983653
    • Rights:
      info:eu-repo/semantics/OpenAccess
    • الرقم المعرف:
      edsbas.5730A3E0