Adaptive cross-direction control of paper basis weight

Abstract The initial setting and maintaining of the desired paper basis weight (in machine direction and cross direction) is to be ensured adaptively for several given paper grades. Technical equipment includes: usual traversing gauge at the output of the paper machine, special traversing robot for shaping the headbox lip (sequential setting of screws), control computer. Adaptive multivariate LQG control with recursive identification generalized to distributed parameter system has been designed with the following features: integral (convolution type) model of the process respecting the continuous nature of all signals and kernels involved (by means of spline approximation), repetitive control synthesis (via Riccati equation with periodical solutions).