Nonlinear control of a paper-stock flowbox

The paper deals with the design of controllers for a paper-stock flowbox using nonlinear models derived from equations representing the dynamics of slurry flow and pressurised air in the box. Three control schemes have been considered, namely interactive control, noninteracting control and complementary interacting control. The control schemes have been compared by digital simulation of the box and controllers. Noninteractive control shows significant improvements over the dual-control interactive scheme but the best control is given by the complementary interactive scheme.