A study on the robust control algorithm for an axially moving film

This paper presents the non-linear modeling of the web(film) transfer syste m and design of (robust) sliding mode controller bared on the developed mod el. The system model shows change in the roll-radius during winding and unw inding of the web. The change of inertia makes the web transfer system time -varying and nonlinear. In designing a robust controller, two major objecti ves are considered. The first one is that the web transferring velocity tra cks a given reference velocity; the second one is that the web tension is r egulated at a certain value. To verify the control algorithm, the proposed algorithm is compared with a conventional PID controller through a campater simulation based on simulink model. Computer simulation study shows that t he proposed robust sliding mode controller is an improvement over the PID c ontroller for various control inputs.