Impact Response Analysis of Panel with Partial Acoustic Black Hole Supported by Nonlinear Concentrated Springs

Abstract

This paper describes vibration analysis using Finite Element Method with Model Strain Energy Method for steel panel connected by nonlinear concentrated springs under impact load. The panel is composed of steel layer with a partial acoustic black hole having a damping layer in the plate edge. The Acoustic Black Hole has a viscoelastic damping layer. Finite elements for the nonlinear springs with hysteresis are expressed and are connected to the panel modeled by linear solid finite elements in consideration of complex modulus of elasticity. We calculated modal loss factors and transient responses including coupled motions between the non-linear springs and the panel. From the dominant eigen modes and the time histories, we clarified effects of a partial acoustic black hole having a damping layer in the plate edge and non-linear springs on the nonlinear damped responses.