Scattering from Gratings of High Aspect Ratio Compliant Tubes Embedded in an Elastomer Layer
Abstract
An analytical formulation is presented for normal incident plane wave scattering from gratings of compliant tubes embedded in a viscoelastic layer immersed in fluid. Approximations to boundary conditions at the interfaces between the interstice and compliant elements 1 are modified by treating the interstice as a viscoelastic plate which has the material properties of the polymer matrix material. The compliant tubes are modeled as two structurally and acoustically coupled plates with end conditions which correspond to those for the vibrational modes of a highly eccentric long cylindrical shell. Conditions on normal displacement, normal stress, and tangential displacement relate the compliant plates and viscoelastic plate boundaries to the surrounding viscoelastic layers. Comparisons of the insertion loss for gratings in fluid and gratings in viscoelastic layers in fluid are shown. Limitations of the analysis are discussed and calculations will be compared with experimental data.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 21, 1984
- Accession Number
- ADA636289
Entities
People
- Robert S. Janus
- Ronald P. Radlinski
Organizations
- Naval Underwater Systems Center