Energy focusing using the dispersion of flexural waves

Abstract eng:
The phase velocity of flexural waves depends strongly on their frequency, which leads to the distortion of traveling broadband pulses. This effect is used to focus strain energy at a particular location in a wave guide. Bending waves are excited at one end of a glass beam and focus to a sharp peak at another location of the beam. The excitation is determined from a time reversed spectral element simulation. The focusing of the bending waves in the glass beam is measured using a Laser Doppler vibrometer. Strong focusing was observed.

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