Multilayer structures allow obtaining good performance in acoustic insulation to eliminate unwanted noise in the medium and high frequencies in many applications such as building and transport industry. In this paper, the sound transmission of multilayer systems is studied using the Transfer Matrix Method (TMM). The studied multi-layered panels include elastic, viscoelastic and porous materials. Several configurations of multilayer systems are studied, and their corresponding transmission loss T L is computed. Also, the effects of porous material characteristics are studied to evaluate the impact of each parameter.

An optimization method of the acoustic absorption of multilayer panels composed of porous, elastic, and viscoelastic materials is presented in this paper. The used objective functions consist on the maximizing of the sound Transmission Loss (TL) and the minimization of the mass of the configuration. For this, the genetic algorithm was used coupled with an analytical computation of transfer matrix of the studied panel. This study aimed to found the optimal values of the thicknesses of each layer with a total thickness which should not exceed 30 mm. The others parameters are keeping constant. The developed method was applied to a two‐layer panel. The obtained results are analyzed giving sources to choose between the studied configurations.