Structural damping by lightweight poro-elastic media

摘要: Abstract The structural damping performance of limp porous media: i.e., fibrous layers with negligible bulk frame elasticity, was investigated previously. Presented here is a study focusing on media (i.e., fibers, foams, etc.) elastic frames, referred to as “poro-elastic media”. By using the near-field (NFD) analytical toolbox, power distributions and performances were evaluated for both layer poro-elastic resting an infinitely-extended stiff panel driven by harmonic line force. found outperform due additional dissipation within solid phase material. effect bonding unconstrained also studied. then made partially-constrained adding two discontinuities finite translational rotational inertias. constrained case validated comparison element model, used compare loss factors layer. Insights concepts are summarized design damper.