Are there waves in elastic wave turbulence ?

Details Are there waves in elastic wave turbulence ? Are there waves in elastic wave turbulence ?

2008-05-19

arxiv.org/abs/0805.2886v2

Physics

Classical Physics

published in Physical Review Letters volume 100, 234505 (2008) http://link.aps.org/abstract/PRL/v100/e234505 minor modificatio

Scientific paper

10.1103/PhysRevLett.100.234505

An thin elastic steel plate is excited with a vibrator and its local velocity displays a turbulent-like Fourier spectrum. This system is believed to develop elastic wave turbulence. We analyze here the motion of the plate with a two-point measurement in order to check, in our real system, a few hypotheses required for the Zakharov theory of weak turbulence to apply. We show that the motion of the plate is indeed a superposition of bending waves following the theoretical dispersion relation of the linear wave equation. The nonlinearities seem to efficiently break the coherence of the waves so that no modal structure is observed. Several hypotheses of the weak turbulence theory seem to be verified, but nevertheless the theoretical predictions for the wave spectrum are not verified experimentally.

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