Accession Number : ADA258769


Title :   Critical Frequencies in Scattering from Submerged Elastic Shells


Descriptive Note : Final proceedings rept.


Corporate Author : NAVAL RESEARCH LAB STENNIS SPACE CENTER MS


Personal Author(s) : Werby, Michael F ; Ali, Hassan B ; Broadhead, Michael K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a258769.pdf


Report Date : Oct 1992


Pagination or Media Count : 8


Abstract : In the process of scattering from submerged elastic shells, it is possible to excite many types of resonances. Among these are the lowest order symmetric and antisymmetric Lamb modes, and the waterborne waves, such as the pseudo-Stoneley resonances and the higher order symmetric and antisymmetric Lamb modes Si and Ai (i = 1, 2, 3, ...). the frequency at which these originate are referred to as critical frequencies. We establish simple rules to determine the frequencies at which the resonances originate as a function of shell thickness and material properties.


Descriptors :   *FREQUENCY , *ACOUSTIC SCATTERING , *ELASTIC SHELLS , FUNCTIONS , PROPAGATION , REPRINTS , THICKNESS , SCATTERING , WATER , MATERIALS , EXCITATION , WAVEGUIDES , STEEL , PHASE , SHALLOW WATER , ALUMINUM , SYMMETRY , RESONANCE , ACOUSTICS , LAMB SHIFT , WATERBORNE , WAVES , FLUIDS , OCEANS


Subject Categories : Structural Engineering and Building Technology
      Acoustics
      Nuclear Physics & Elementary Particle Physics
      Radiofrequency Wave Propagation


Distribution Statement : APPROVED FOR PUBLIC RELEASE