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Simulation and adaptive control for valve friction problems in a paper mill

University of British Columbia

This thesis attempts to address issues of poor performance in a paper mill. It looks at two specific issues; the need to perform offline performance evaluations using simulation tools, and the specific problems associated with friction in control valves. The first issue is addressed through the development of an object oriented component library for the dynamic simulation of complex systems in the mill. Modelling of a paper machine approach system is used as the basis for developing a structure that could later be expanded to include blocks for simulation of all parts of the paper mill. The simulation is used to identify potential problems, and to evaluate some possible solutions. It is also used to evaluate the effects on the final product of valve friction in a particular control loop. The second issue involves the oscillatory behaviour generated when a valve with fiction is placed under conventional automatic control. The nature of friction and its effects on a typical pneumatic valve are analysed. Various macroscopic friction characteristics are used to create an adaptive control algorithm that can be used on the valve without a requirement for high-bandwidth control. The strategy is tested on a simulation of a pneumatic valve with friction and compared to conventional PI control.

Thesis/Dissertation

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2009-06-09

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http://hdl.handle.net/2429/8892

Electrical and Computer Engineering

University of British Columbia

UBCV

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