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Modeling of micro-perforated panels in a complex vibro-acoustic environment using patch transfer function approach.

L Maxit1, C Yang, L Cheng

  • 1Laboratoire Vibrations-Acoustique, INSA Lyon, 25 bis, av. Jean Capelle, 69621 Villeurbanne Cedex, France.

The Journal of the Acoustical Society of America
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This study introduces a new vibro-acoustic model for micro-perforated panels (MPPs) in complex environments. The patch transfer functions (PTF) approach accurately predicts noise absorption, validated by experiments.

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Area of Science:

  • Acoustics and Vibration Engineering
  • Materials Science
  • Structural Dynamics

Background:

  • Micro-perforated panels (MPPs) with backing cavities are established noise absorbers.
  • Traditional studies often use simplified one-dimensional models (e.g., Kundt tube).
  • Real-world MPP efficiency is affected by surrounding vibro-acoustic systems and excitation.

Purpose of the Study:

  • To develop a comprehensive vibro-acoustic model for MPPs in complex environments.
  • To utilize the patch transfer functions (PTF) approach for modeling.
  • To provide a physically interpretable and adaptable modeling framework.

Main Methods:

  • Developed a vibro-acoustic formulation using the patch transfer functions (PTF) approach.
  • Treated micro-perforations and MPP flexibility within the PTF framework.
  • Applied the PTF approach to model an MPP with a backing cavity in an infinite baffle.

Main Results:

  • The PTF formulation explicitly represents coupling between vibro-acoustic subsystems.
  • The model facilitates a clear physical interpretation of MPP behavior.
  • The proposed method was validated against existing experimental data.

Conclusions:

  • The PTF-based vibro-acoustic model effectively predicts MPP performance in complex scenarios.
  • This approach offers a more realistic and adaptable method for designing noise absorption systems.
  • The study confirms the utility of PTF for analyzing coupled vibro-acoustic structures.