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A Nonlinear Control Concept for Rolling Mills
Author(s) -
Fuchshumer S.,
Grabmair G.
Publication year - 2002
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/1617-7061(200203)1:1<101::aid-pamm101>3.0.co;2-a
Subject(s) - mill , nonlinear system , linearization , control theory (sociology) , rolling mill , tension (geology) , feedback linearization , engineering , process (computing) , mechanical engineering , control (management) , control engineering , computer science , materials science , metallurgy , physics , quantum mechanics , artificial intelligence , ultimate tensile strength , operating system
This contribution is concerned with the nonlinear control of a temper rolling mill based on the exact input/output linearization method. The considered subsystem of the temper rolling plant consists of a four‐high mill stand with a hydraulic adjustment system, and bridle rolls in the entry and the exit section. The demand on the temper rolling process is to establish a certain elongation of the steel strip under the action of the roll force and certain predefined backward and forward strip tensions in order to achieve the desired material characteristics and surface properties of the rolled product. The nonlinear control concept to be presented is characterized by the fact that the torques of the bridle rolls are intended as control inputs for the elongation and master speed control, whereas the hydraulic adjustment system and the main mill drive are used to take effect on the strip tensions. After a brief review of the mathematical model of the mill we will focus on the multi‐input nonlinear tension control.