“…Such parameters may be found from the velocity dispersion of the circumferential waves (S i and A i ), since it is directly related to the geometry and to the physical properties of the shell. Different methods have been proposing for analyse of the circumferential waves propagating around the cylindrical shell which includes temporal analysis [7,9], spectrum analysis [5,7], parametric time-frequency analysis [10][11][12][13][14][15][16], wavelet transform [19][20] and neural networks [21][22].…”