電空弁ポジショナにおける発振現象の防止とロバスト安定性

概要

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This paper focusses on the stabilization of an electropneumatic valve positioner. When the pneumatic tube from controller to actuator exceeds a certain length, the actuator will generate hunting oscillation due to the time lag of the pressure signal through the tube. To prevent this hunting, a new stabilization method is proposed for such control systems with time lag and nonlinearity. First, the system's structure and compensating circuit are explained. Next, the stabilization method is described and the prevention of hunting is certified by the Nyquist diagram. Also, the dynamic behaviors are examined through simulation experiments. Third, the robust stability condition is derived based on Palmor's criterion. Moreover, the stability margins under the identified errors of time lag are evaluated.
1991-09-25