Stabilization of Electropneumatic Valve Positioner Using Simplified Smith Method

概要

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When an electropneumatic valve positioner is surrounded by a combustible gas, the electrical control circuit must be connected with the actuator by a long pneumatic tube. If the pneumatic tube exceeds a certain length, hunting will occur in the drive shaft of the actuator due to the time delay of the pneumatic pressure signal. Though the Smith method is known to prevent such hunting, there are some difficulties in application. Thus, a new stabilization method is proposed to realize a simpler compensating circuit. First, the approximate compensator based on the Smith method is explained. Second, the robust stability condition for such a system is derived, developing the Palmor method. Using this method, the stability margin under the identified error of time delay is clarified. Finally, through experiments, it is ascertained that the introduction of the approximate compensator makes it possible to stabilize the valve positioner.
一般社団法人日本機械学会の論文
1995-09-15