High Precision Control of NIP Loading in Paper Manufacturing Units

M. Cotsaftis and E. Keskinen (Finland)


Rolling contact force, Fuzzysliding control, Absolute stability


To guarantee precise enough positioning of rolls in paper manufacturing units as required for paper web quality, their control should be reassessed owing to the strict constraints which have to be satisfied especially during the nip closing operation. The problem is studied from the complete nonlinear dynamical set of equations. It is shown that asymptotic and robust stability of rolls position trajectory in the complete domain and satisfying system constraints is obtained with a controller which the sum of a linear PD part and a correcting nonlinear Fuzzy Sliding one compensating the nonlinear terms in system equations.

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