Analysis of vibration transmission characteristics of sound absorbing double walls with Krylov-type acoustic black hole in cover plate

Abstract

Vibration suppression is an important technology both industrially and environmentally to realize a comfort industrial product with a safe structure. In this paper, we carry out for numerical simulation of damped vibration structure having porous material sandwiched by double walls. The cover plate in double walls has a Krylov type acoustic black hole. All edge where the black hole exists, has free boundary. Damping material is on the surface of the black hole. Numerical analysis is performed to clarify changes of vibration reduction and 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.