Abstract
This paper deals with the free vibrations of infinite elastic plates in the presence of water. Although this is a textbook problem, which has been studied a long time ago, no exact solution in the framework of linear theory seems to have been given so far. A very simple exact solution given in the paper permits the computation of "added virtual mass factors". It is found that the results not only differ quantitatively but also qualitatively in an important manner from the known approximate textbook solution: no threshold wavenumber for acoustic short circuit is found with the exact solution.
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