The 3rd octave chatter in cold rolling mills is a major issue for the
industrial production of thin sheets with very tight tolerances, like
packaging steels for instance. In this context, an experimental and
theoretical approach, completed in partnership by Arcelor and VAI,
afforded a precise analysis and innovative results, in the following
fields : global on-line tandem mill instrumentation and efficient signal
treatments implementation ; clear differentiation between brummer (non divergent mode) and chatter (divergent mode) ; modelling of
interactions between chatter and technology (analytical and F.E.
approaches) ; advanced chatter monitoring and industrial implementation.