Response analysis using FEM and SEA for Two Damped Panels Connected in L-shape with an Acoustic Black Hole Having Various Length

Abstract

This paper deals with damped responses using FEM and Statistical Energy Analysis (SEA) for two panels connected in an L shape with an acoustic black hole and a viscoelastic damping layer. A plate with the acoustic black hole proposed by Kryrov has a sharply tapered edge followed by high power functions of the propagation distance. On the surface of the black hole, a thin viscoelastic material are laminated. When the black hole is installed in the plate, bending waves never reflect theoretically at this tapered edge. By changing the length of the black hole, FEM and Modal Strain Energy method are applied to obtain the internal loss factors to account for damping coupling between substructures with the black hole. Effects of the black hole on coupling loss factors which are related with the energy flow in waves are also investigated