Summary
As one of the most crucial components in control loops, pneumatic control valves ensure product quality and personnel safety. During prolonged operation of valves, nonlinear motion caused by valve stiction often leads to oscillations in control loops. Therefore, it is crucial to analyze the valve nonlinear motion from the valve position (MV) for detecting and maintaining control loops. In this paper, we construct the valve motion model in the control loop based on the DABlib module of MATLAB/Simulink. From the perspective of phase space reconstruction, we compare and evaluate the characteristics of valve nonlinear motion in loop oscillation combined with recurrence quantitative analysis (RQA).
