Simulating the sound transmission loss of complex curved panels with attached noise control materials using periodic cell wavemodes

F. Errico , G. Tufano , O. Robin (1) , N. Guenfoud , Mohamed Ichchou (2) , Noureddine Atalla (3)

1 LBBE - Laboratoire de Biométrie et Biologie Evolutive - UMR 5558
2 LTDS - Laboratoire de Tribologie et Dynamique des Systèmes
3 UdeS - Département de génie mécanique [Sherbrooke]

The sound transmission loss of complex curved aircraft panels under diffuse acoustic field excitation is experimentally and numerically studied. Two different aircraft sidewall panels are considered: a thick composite sandwich panel and a thin aluminium panel with stiffening elements (stringers and frames). Both bare configuration and with attached soundproofing material are tested in laboratory conditions in coupled rooms. The numerical approach relies on a wave finite element method including modal order reduction at cell scale and an extension based on the transfer matrix method, for the inclusion of poroelastic treatments. The results obtained show that the proposed numerical scheme is efficient for predicting the sound transmission loss of such complex structures.

Mots clés: Sound Transmission; Periodic Structures; Curved Composite Structures; Noise Control Materials

Domaines: Sciences de l'ingénieur [physics]

F. Errico, G. Tufano, O. Robin, N. Guenfoud, Mohamed Ichchou, et al.. Simulating the sound transmission loss of complex curved panels with attached noise control materials using periodic cell wavemodes. Applied Acoustics, 2019, 156, pp.21-28. ⟨10.1016/j.apacoust.2019.06.027⟩. ⟨hal-02392107⟩