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Subject: Re: Acoustic wave propagation in thin plates
Date: Fri, 21 Nov 2008 18:36:02 +0000 (UTC)
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The classic book by Graff has theoretical results for waves in plates and shells, including Lamb waves if I remember correctly.
Also, you don't describe the boundary conditions of interst, but I have written a Matlab program that may be useful to you if you want to explore the eigenvalue problem.

http://www.mathworks.com/matlabcentral/fileexchange/11399

Good luck.