Inverse characterization of a locally reacting porous material by means ofin situmeasurements and model fitting

Research output: Contribution to conferencePaper

Abstract

With the development of numerical simulations for room acoustics, the need for accurate broadband impedance boundary conditions grows. The main methods to estimate the properties of materials, namely the impedance tube method and the reverberation room method, do often not allow to capture the properties of the material in the mounting conditions. This calls for the use of an in-situ measurement method, such as the ones making use of a pressure-velocity (PU)probe. However,in-situ characterization is limited in the lower frequency range,because the environment of the measurement location often perturbs the results at low frequencies. Moreover, the way the sample is applied is not controlled and could lead to unwanted sample size diffraction effects. To overcome the limitations of existing in-situ approaches, we propose a method that combine in-situ measurements with a suitable model fitting. The method is applied to capture normal-incidence reflection coefficient of a locally reacting porous panel of various sample widths, and the sensitivity of the method to various measurement errors is studied in simulations and in a real measure
Original languageEnglish
Publication statusIn preparation - 22 Sep 2020

Keywords

  • in-situ characterization
  • PU probe
  • model fitting

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