  A vibrating plate is set into a chaotic state of wave turbulence by either a
periodic or a random local forcing. Correlations between the forcing and the
local velocity response of the plate at the forcing point are studied.
Statistical models with fairly good agreement with the experiments are proposed
for each forcing. Both distributions of injected power have a logarithmic cusp
for zero power, while the tails are Gaussian for the periodic driving and
exponential for the random one. The distributions of injected work over long
time intervals are investigated in the framework of the fluctuation theorem,
also known as the Gallavotti-Cohen theorem. It appears that the conclusions of
the theorem are verified only for the periodic, deterministic forcing. Using
independent estimates of the phase space contraction, this result is discussed
in the light of available theoretical framework.
