Abstract
A new space-frequency-wave number representation is introduced. This representation is obtained by space-sliding window FFT of the space-frequency representation. This new method is used to experimentally define the space origin of the pulse-generated Lamb wave on an air-filled cylindrical shell immersed in water (relative thickness is equal to 0.03). The space-wave number slices also allow the measurement of the Lamb-wave complex wave numbers and their propagation direction (reduced frequencies range from 20 to 1000). The reflected field is experimentally separated from multiple propagating Lamb waves. This efficient method is complementary to the surface wave analysis method (S.W.A.M.) [Martinez et al., 16th ICA and 135th ASA Congress, II, 1359–1360 (1998)]. In particular, the space-wave number representations are not limited by space windowing. The experimental results confirm the theoretical computations performed on waves propagating on a plane plate.
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