Low-frequency vibration reduction using a sandwich plate with periodically embedded acoustic black holes

摘要

In this work, passive constrained-layer damping with periodically embedded acoustic black holes (ABHs) on a viscoelastic layer is used to reduce vibrations and noise. The ABH is a tapered profile described by a power-law relation which is embedded in the host structure. The tapered profile allows progressive decrease of the velocity of propagating waves, which enables highly efficient vibration attenuation in the high-frequency range (kilohertz). This research proposes an efficient modeling technique that combines ABHs with a sandwich plate to enhance the low-frequency (hertz) vibration reduction. The loss factor of the sandwich plate with embedded ABHs is numerically evaluated via a modal strain energy method. The results suggest that the proposed approach enables highly efficient vibration dissipation performance in the low-frequency range. (C) 2018 Elsevier Ltd. All rights reserved.