Accession Number : ADA262237


Title :   A Study of the Higher Order Lamb Resonances on Elastic Shells: Their Prediction and Interpretation


Descriptive Note : Conference paper


Corporate Author : NAVAL OCEANOGRAPHIC AND ATMOSPHERIC RESEARCH LAB STENNIS SPACE CENTER MS


Personal Author(s) : Werby, M F ; Broadhead, M K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a262237.pdf


Report Date : Apr 1992


Pagination or Media Count : 11


Abstract : We study all the resonances generated on elastic shells for a ka from 0 to 500 for steel and aluminum for a thickness of 5%. We observe the lowest order symmetric and antisymmetric model or Lamb resonances, waterborne and pseudo-Stoneley resonances and the higher order Lamb modes A and S, where i - 1, 2, 3 ... . We plot some of the phase velocities of some of the relevant resonances out to a ka of 500 and indicate simple expressions that predict the onset of each of the resonances. We demonstrate by use of partial wave analysis that the new expressions that predict the onset (critical frequencies) of the higher order Lamb modes are reliable. Further, interesting phenomena occur at the inception of some of the resonances and we discuss some of those cases.


Descriptors :   *ACOUSTIC SCATTERING , *UNDERWATER ACOUSTICS , *ACOUSTIC RESONANCE , *ELASTIC SHELLS , VELOCITY , FREQUENCY , THICKNESS , MODELS , ACOUSTIC WAVES , WAVEGUIDES , WATERBORNE , SPHERES , STEEL , SHALLOW WATER , WAVE PROPAGATION , ALUMINUM , ACOUSTIC SIGNALS


Subject Categories : Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE