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Presentation
Investigations on the sensitivity of the relationships between sound absorption characteristics and microstructure related parameters for polyurethane foams
ICA 2013. Acoustical Society of America (2013)
  • Morvan Ouisse
  • Olivier Doutres, Ph.D.
  • Noureddine Atalla
  • Mohamed Ichchou
  • David Begg
Abstract
Straightforward semi-phenomenological models have been developed for highly porous polyurethane foams to predict the macroscopic non-acoustic parameters involved in the classical Johnson-Champoux-Allard model (i.e. porosity airflow resistivity...) from microstructure properties (i.e strut length strut thickness and reticulation rate). These microstructure properties are measured using sophisticated optical methods (i.e. optical microscope SEM) and a large variability can be observed due to great complexity of the 3D microstructure; variability which also depends on the precision of the measurement device. This work investigates how the variability associated with the model inputs affects the model outputs (i.e. non-acoustic parameters surface impedance and sound absorption coefficient). The sensitivity analysis is based on the Fourier Amplitude Sensitivity Test (FAST). It helps quantify the correlation between the input parameters and identify the parameters contributing the most to output variability thus requiring precise measurement. This study illustrates the preponderant impact of the reticulation rate (i.e open pore content) on acoustic performances and guides the user on the required optical measurement device.
Keywords
  • Polyurethane foams,
  • open cell foams,
  • sound absorption,
  • microstructure,
  • sensitivity analysis
Publication Date
Spring June 2, 2013
Citation Information
Morvan Ouisse, Olivier Doutres, Noureddine Atalla, Mohamed Ichchou, et al.. "Investigations on the sensitivity of the relationships between sound absorption characteristics and microstructure related parameters for polyurethane foams" ICA 2013. Acoustical Society of America (2013)
Available at: http://works.bepress.com/olivier_doutres/39/