Robust PI–LPV Tension Control with Elasticity Observer for Roll–to–Roll Systems

Disturbance observer‐based distributed sliding mode control of multimotor web‐winding systems

“…By dividing the global system into several subsystems, the decentralised control of web-winding systems has been studied extensively based on local states information. Decentralised proportional integral and proportion integration differentiation (PID) controllers with tension observers are found in [7]. A decentralised H ∞ control approach is designed in [8], which can overcome chattering caused by system uncertainty.…”

“…What is more, because of the coupling between subsystems, adverse effects of external disturbances are transmitted through the web material within the system, which may lead to the instability of the whole system. Despite that there are some works about disturbance rejection for web-winding systems, such as H ∞ [1,3,4,7,8] and dynamic feedback linearisation [5], they are mainly based on the linear control idea. As we all know, with model uncertainties and external disturbances, high gain may be required to reject the effects of uncertainties and disturbances if just linear feedback control is employed [20].…”

Velocity-Sensorless Decentralized Tension Control for Roll-to-Roll Printing Machines

“…Online PID gain tuning techniques were presented using neural networks and fuzzy logic to optimize the cost function, thereby achieving significantly improved robustness despite the winder inertia variations [7]- [10]. A tension estimator based on the nonlinear observer design technique was proposed to lower implementation cost [11], [12]. The novel observer design techniques as in [13], [14] can be used as a solution to the web-velocity estimation problem by using only the lower and upper bounds of machine parameters.…”

Robust decentralized control for large-scale web-winding systems: A linear matrix inequality approach

“…A proportional integral (PI)-based tension control approach is developed and applied to a continuous strip processing line in Song and Sul (2000). For the sake of improving web tension regulation to different operation points, Linear Parameters Varying-Proportional Integral (LPV-PI) controllers are designed in Gassmann and Knittel (2011). Multi-variable decentralized H ' control approaches are proposed for webwinding systems in Featherstones et al (2000) and Knittel et al (2006).…”

“…radius and inertia), the proposed controllers in Adjadi et al (2009) and Pagilla et al (2007a,b) can obtain the same performance during the whole winding process. To ensure stability over a wide range of web velocities and tension in the presence of parameter uncertainties, LPV controllers are introduced (Claveau et al, 2008;Gassmann and Knittel, 2011;Knittel et al, 2003;Koc et al, 2002). These strategies can increase the closed-loop system robustness to parameter variations, however, the level of parameter uncertainty is not considered in the design of controllers.…”