Abstract
Here, it is shown that properly-designed limp porous materials such as fibrous layers can provide damping equivalent to conventional viscoelastic dampers while providing advantages such as light weight and effective sound absorption. This then allows porous layers to be used as multi-functional noise and vibration control solutions in automotive and aerospace applications. It has also been found that the addition of bulk elasticity to the solid phase of the porous medium is beneficial since it improves damping performance compared to equivalent limp treatments. In this study, porous media, such as fibers and foams, were designed to serve as treatments for various vibrating structures to examine their damping effectiveness. Both analytical modeling and numerical simulation based on finite element methods were involved depending on the complexity of the structure. Specifically, a Fourier transform-based computational method was introduced as the key step to realize the accurate prediction of a panel’s spatial response based on its wavenumber-frequency spectrum. Then, parametric studies were conducted on a porous layer to identify the optimal bulk properties that would allow the layer to provide the largest possible damping within the target frequency region. Finally, design concepts for achieving the maximum damping potential of porous layers are summarized.
Keywords
Nearfield damping, Porous materials, fibrous materials, Vibration damping, Transfer matrix
Subject
Acoustics and Noise Control
Date of this Version
5-8-2023
Comments
Yutong Xue and J. Stuart Bolton, “Design and optimization of lightweight porous damping treatments,” 184th meeting of the Acoustical Society of America, Chicago, Il, May 2023. Paper 1pCA3, Session: Computational Methods for Modeling Acoustic Damping (Invited by Shung H. Sung, D. Keith Wilson and Kuangcheng Wu). Abstract published in the Journal of the Acoustical Society of America 153(3) Pt. 2, p. A69. DOI: https://doi.org/10.1121/10.0018194