Application of advanced control methods in the pulp and paper industry — A survey

A Perspective on Advanced Strategies for Process Control (Revisited)

“…By contrast, in the indirect approach, model parameters in an assumed model structure are estimated via a recursive parameter estimation technique from the same closed-loop data. Detailed descriptions of adaptive control techniques for both linear and nonlinear control systems are available in textbooks [II], [84], [102], [126], survey articles [205], [8 I], [59], [8] and their respective bibliographies.…”

Control‐oriented modeling of sheet and film processes

“…There exist strong interactions between actuator movements and the resulting sheet profile, making the CD control problem challenging and interesting. Since the MD pzoblem has been extensively studied (Astrom et al, 1977;Astrom and Wittenmark, 1973;Bialkowski, 1978Bialkowski, , 1983Cegrell and Hedqvist, 1975;Dumont, 1986;Ma and Williams, 1988;Sikora et al, 1984), only the CD problem will be discussed here.…”

Multivariable disturbance modelling for web processes

“…Each CD actuator has two bandwidths: a spatial bandwidth, which de® nes its e ective operating range in the CD, and a temporal bandwidth, describing the dynamic response of the actuator. It is normally assumed that the spatial and dynamic responses are separable (Chen et al 1986, Braatz et al 1992, Dumont 1986) and that all actuators have the same temporal response. The assumption of separability means that MD and CD problems can be considered independently.…”