Damping Analysis of Flexural Waves in Fluid-Loaded Single and Constrained Plates
Abstract
A hybrid model was developed for the analysis of constrained-layer damping whereby the base plate is described by exact elasticity theory, while the elastomer and constraining layers are analogous to Kerwin's model. Under fluid loading, the success of the technique is measured by a damping efficiency, the ratio of loss in the elastomer to the total loss due to viscoelastic loss from a composite plate in vacuum, for antisymmetric and symmetric waves separately with the radiation loss from a single fluid-loaded plate. This ignores the interaction of fluid and constrained plate. This study shows that at high and low frequencies discrepancies occur. Inclusion in the hybrid model of both flexural and extensional waves shows that at higher frequencies the presence of the two types of waves redistributes the energy across the plate. Thus it proves necessary to compute damping efficiency from analysis of the fluid-loaded composite plate with inclusion of both antisymmetric and symmetric waves.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1987
- Accession Number
- ADA185116
Entities
People
- Pieter S. Dubbelday
Organizations
- United States Naval Research Laboratory