Analysis of Damping Characteristics for Damped Plate with a Crater Type Acoustic Black Hole Using Modal Strain Energy Method

Abstract

This paper deals with vibration damping analysis using finite element method with Model Strain Energy Method for a plate with a crater type acoustic black hole. On the region of the acoustic black hole, viscoelastic vibration damping material is laminated. The plate with the crater type acoustic black hole is fixed at all edges. The damping layer is modeled by linear solid finite elements in consideration of complex modulus of elasticity. We calculated modal loss factors and eigenmodes including coupled deformations among substructures in the damped plate with the crater type acoustic black hole. We clarified effects of the acoustic black hole on the modal damping for each eigenmode