Abstract
This research is concerned with the analysis of dynamic behavior and the stabilization of an electropneumatic valve positioner. When the valve positioner is surrounded by combustible gas, the electrical control circuit must be positioned far from the actuator by using the long pneumatic tube as a safety measure. However, if the length of the pneumatic tube exceeds a certain length, hunting will occur to the drive shaft of the actuator due to the time lag of the pneumatic pressure signals and the nonlinear characteristics existing in the system. First, the behavior of hunting and its generating conditions are clarified. Next, in order to prevent hunting, the compensator based on the Smith method is applied to this system and the effectiveness is certified. Finally, by experiment, it is ascertained that the introduction of the compensator makes it possible to stabilize the positioned.
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