新波動ブラックホールを持つ制振材積層T形断面構造の減衰挙動のFEM 解析

抄録

This paper describes vibration damping analysis using finite element method with Model Strain Energy Method for structures having T-shaped cross section with a new acoustic black hole. Usually, Krylov type acoustic black hole is formed at one edge of a beam or a plate where its thickness decreasing shapely by following higher order power function. We proposed a new type structure which acoustic black hole exists in the edge of the beam or the plate as height of the web in the T-shaped structure decreasing by replacing its thickness like Krylov’s black hole. On the region of the acoustic black hole, viscoelastic vibration damping material is laminated. The new black hole with 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 T-shaped structure. We researched effects of this new acoustic black hole on the modal damping for each eigenmode.