  The paper describes the application of some numerical techniques to analyze
and to characterize the observed dynamical behaviour of fluidized bed systems.
The preliminary results showed clearly that the dynamics of the considered
process can be nonrecurrent and governed by chaotic deterministic rules rather
than by stochastic ones. This significant conclusion was allowed by the
application of a proper filtering procedure which was able to reduce the
unwanted influence of significant broadband noise detected in the sampled
experimental data.
