Analysis of damped vibration and sound radiation for structures having a porous layer sandwiched by double walls with an acoustic black hole

Abstract

Vibration and noise reduction are important technology both industrially and environmentally to realize comfort industrial products with safe structures. In this paper, we carry out for numerical simulation of damped vibration and sound radiation for structures having a porous material sandwiched by double walls. The cover plate in double walls has a Krylov type acoustic black hole. All edges around the walls, have free boundaries. Damping material is on the surface of the black hole. Numerical analysis is performed to clarify changes of vibration transmission from the base plate to the cover plate due to the acoustic black hole using FEM and MSKE method proposed by Yamaguchi et al. Sound radiation from the cover plate is also investigated.