154
Y. Liu et al.
Fig. 14.4 a The stiffened panel with 6 stiffeners. b The flat panel
14.4 Result
14.4.1 Time Domain
The displacement time-domain waveform in the y-axis direction obtained by the
receiving points of the flat panel and the 6 sets of stiffened panels are shown in
Fig. 14.5. It can be seen from the figure that the time of the waveform in the 7 sets
reaching the receiving point is about 95 μs, and the S0 mode Lamb wave velocity
is calculated to be 5.26 km/s, indicating that the number of stiffeners is almost no
effect on the Lamb wave velocity. At the same time, the first wave trough of the
waveform in the flat panel is the largest. As the number of stiffeners increases, the
first wave trough becomes smaller and smaller, indicating that the stiffeners attenuate
the signal, and the more the number of stiffeners, the more severe the attenuation.
The same conclusion applies to the first wave crest.
Fig. 14.5 The displacement time-domain waveform in the y-axis direction obtained by the receiving
points of the flat panel and the 6 sets of stiffened panels