Passive constrained viscoelastic layers to improve the efficiency of truncated acoustic black holes in beams
By Jie Deng, Ling Zheng, Pengyun Zeng, Yifang Zuo, O. Guasch. Mechanical systems and signal processing, 2019
148 citations recorded by the source corpus.
Abstract Power-law profiles at the edges of beams and plates have proved to be a very efficient way to attenuate vibrations. In an ideal scenario, for a profile with zero end thickness, the energy of flexural vibrations would never reflect from the boundaries, giving place to the Acoustic Black Hole (ABH) phenomenon. In practice, however, the edge must be truncated which results in a non-zero reflection coefficient. To partially mitigate this problem, a viscoelastic layer (VL) is typically placed at the tip of the ABH termination to compensate for the effects of truncation. Instead, in this work it will be shown that one can achieve better results by resorting to passive constrained viscoelastic layer (PCVL). The latter consists of a sandwich made of a viscoelastic layer (VL) plus a constrained layer (CL). An analytical model is developed to describe the performance of a truncated ABH beam with PCVL, where the displacement fields are expanded by means of Gaussian functions. The model is validated through finite element (FEM) simulations and experiments. It is observed that a truncated ABH beam with PCVL at the tip performs better than an ABH beam with an unconstrained VL, even if they add equal mass to the system.
Subfields: Aerospace Engineering, Biomedical Engineering, Computational Mechanics
View Paper: https://www.semanticscholar.org/paper/b12044ac9fc3cec8291071de7c41d86083bbe71f
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Biomedical Engineering
In Computational Mechanics
Citations in the corpus
- The acoustic black hole: A review of theory and applications (2020, background): “The use of a constrained visco-elastic layer, instead of the more common viscoelastic layer, leads to significantly enhanced damping [52,86].”