Dispersion identification using the Fourier analysis of resonances in elastic and viscoelastic rods
Résumé
A new method for identifying the dispersion relation in elastic and viscoelastic rods is presented. It relies on the multiple resonance of a strain measurement. The wave velocity is related to the resonance position whereas the damping is related to the resonance bandwidth. Applied to an aluminum bar, the method provides wave dispersion for frequencies up to 60 kHz.
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