Uncertainty analysis of acoustic and non-acoustic parameters derived from four-microphone impedance tube measurements

The uncertainty related to measurements is fundamental for qualifying the method applied estimation of quantities derived from an experimental test. In this paper analysis given intrinsic properties fibrous and porous materials, i.e. characteristic impedance wavenumber, measurement data obtained by a four-microphone tube. addition, some other material properties, amongst which flow resistivity. based on principles contained in Guide Expression Uncertainty Measurements (GUM) its supplement 1, concerning propagation distributions using Monte Carlo (MC) method. GUM MC frameworks are compared with each terms accuracy flexibility use. arising process sampling also evaluated testing several samples cut same batch.