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Based on a 1420mm tandem cold rolling mill in a domestic plant， rolling processes in an UCM mill were simulated by 3D elastic-plastic finite element method(FEM). Effects of work roll bending(WRB)， intermediate roll bending(IRB)and intermediate roll shifting(IRS)on the rolling pressure were investigated. The results showed that peak values of rolling pressure near the strip edge disappear and the central rolling pressure increases with increasing of WRB， and the saddle-shaped distribution of rolling pressure becomes a convex-shaped distribution. Rolling pressure is hardly affected by IRB， and its distribution form is not changed basically. The sharply increased trend of rolling pressure near the strip edge is eliminated due to IRS， and the steep pressure field becomes smooth. Rankings of effects of the three actuators on rolling pressure are: WRB>IRS>IRB， which is in good agreement with the comparison of actuator efficiencies， and it shows that the working mechanism of controlling strip shape is achieved by affecting the rolling pressure distribution. [ABSTRACT FROM AUTHOR]

The multivariable control for hydraulic looper system which has the features of nonlinearity， strong coupling and uncertainty is the difficult point in the rolling control field. In order to improve the control performance of hot continuous rolling strips， a virtual prototype model of the hydraulic looper was built by using ADAMS， then the iterative learning control(ILC)system based on a non-interactive decoupling strategy was designed by using MATLAB， thus a co-simulation model was built by using ADAMS/Sub module and MATLAB/Simulink interface. Simulation studies were made for traditional PID control system and for the designed control system on the basis of this co-simulation model.The simulation results showed that the designed control system further weakens the coupling effect between the looper height and tension， and achives better control effect of the looper system. [ABSTRACT FROM AUTHOR]