Stability analysis of paper machine headbox using a new PI(D) tuning technique

Abstract

Paper, today, has made an important place in human's life. Being an important commodity, paper has different qualities throughout the globe. As the technology is advancing, paper is being used for numerous applications and need of good quality paper is increasing daily. To have papers of desirable quality, paper machines with latest technology are developed. However, the quality of paper principally depends on the prime element of paper machine i.e. Headbox. Headbox is a highly non-linear Multi-input Multi-output (MIMO) component of paper machine and requires a precise control of its major parameters to get good quality papers which eventually responsible for sustained economy of pulp and paper industry. In past few decades, headbox has been a key element for research. Researchers have developed different control algorithms for headbox. This paper presents stability analysis of paper machine headbox using a new technique of Proportional -Integral -Derivative (PID) controller design namely Extended Forced Oscillation method (EFO). Also, the paper presents a comparative analysis of EFO method of PID tuning with the conventional Ziegler -Nichols(ZN) tuning technique based on transient characteristics and performance indices of headbox.

Design and Simulation of PID Controller based Pressurized Head Box in Paper Machine

“…The controlled variables in head box taken into consideration are pressure and stock level where the manipulated variables are speed and the air valve position. For the design of controller, a decoupled model is obtained [6]. A static decoupling method is used for the design purpose.…”