Achievement of acoustical properties of foam materials by tuning membrane level: Elaborations, models and experiments

摘要: This work presents a combined numerical and experimental approach to characterize the macroscopic transport acoustic behavior of foam materials with membrane cellular structure. A direct link between sound absorption foam-based layer its local microstructural morphology is also investigated. To this regard, we first produce set samples having same density monodisperse pore size but different values closure rate windows separating pores. Then, connectivity membranes measured directly on SEM together binocular images. The obtained morphological information used reconstruct representative unit cell for computational performance. knowledge model porous by hybrid based scaling laws semi-phenomenological JCAL model. For validation purpose, simulations are further compared data from three-microphone tube tests, very good agreement observed. In terms, results point out that given high porosity size, can archive absorbing ability based-foam controlling level at range 45-85$\%$. elaborate these foams, gelatin concentration in 14-18$\%$ should be making process. addition, obtain instance peak average specific frequency interest varying content. Methodologically, our proposes (i) systematic properties microstructure, (ii) manufacturing technique make foams desired microstructure.