Input data

・ , the successive time points, at which the FSR measures the normal stress at the inner surface of the BS,

・ , the values of the QE component of the stress measured by the FSR at the above time points

・ , the parameter determined from the calibrating identification for the BS without the AI layer as is described in Remark A.2

・ , the thickness of the BS

・ , the speed of the bulk acoustic waves in the BS

・ , the stress-relaxation time of the BS

・ an analytical or tabular dependence of the speed of the bulk acoustic waves in the AI on the volumetric mass density of the AI, i.e., dependence in (C.36) (e.g., [2] , Figure 1)

・ , the volumetric mass density of air (e.g., see (1.2))

・ , the volumetric mass density of the continuous, non-porous AI (e.g., see (1.3))

Parameters that can be identified

・ , the source term in the acoustic equation for the BS (see the text on (C.29) and (C.31))

・ , the thickness of the AI

・ , the speed of the bulk acoustic waves in the AI

・ , the stress-relaxation time of the AI

・ , the source term in the acoustic equation for the AI layer (see the text on (C.29) and (C.31))

・ , the volumetric mass density of the AI

・ , the bulk modulus of the AI

・ , the porosity of the AI