Operator-based Compensation of Hysteresis, Creep and Force-dependence of Piezoelectric Stack Actuators
نویسندگان
چکیده
The present paper will describe an approach for the simultaneous real-time compensation of hysteresis, creep and force-dependence effects of a piezoelectric stack actuator by a feed-forward controller. The basis of the feed-forward controller is given by so-called complex creep and hysteresis operators, which when adequately implemented, lead to a precise model of the creep and hysteresis characteristics. These complex creep and hysteresis operators consist of the weighted superposition of elementary creep and hysteresis operators which are mathematically simple and which reflect the qualitative properties of the transfer characteristic of the transducer. This operator-based transducer model allows the prediction of transducer displacement resulting from the controller voltage and the reaction force of the surrounded mechanical structure. This information is used within the feed-forward controller in order to calculate the compensation signal. As a result the maximum linearity error caused by hysteresis and creep effects will be lowered by one order of magnitude. Copyright 2000 IFAC
منابع مشابه
Real-time Compensation of Hysteresis and Creep in Piezoelectric Actuators
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