| Smart materials such as piezoceramics are being widely used as actuators and sensors in micro-positioning and active control applications. However, a major limitation of actuators made of piezoceramics is the non-linearity arising due to hysteresis, particularly under high electric fields. It is desirable to have a methodology to predict the effects of hysteresis for these actuators.; The problem is even more challenging for new classes of piezoceramic smart material actuators. These actuators are complex, elasto-ceramic structures embedded in a wide variety of material matrices. Hysteresis modeling via first principles is virtually impossible for such actuators. Hence, phenomenological approaches are of great interest. The main objective of this dissertation is to investigate the application of the Preisach approach, which is a popular phenomenological model, to predict the hysteresis effects in state of the art piezoceramic actuator systems.; Preisach models have been successfully used in the past to predict hysteresis in ferromagnetic systems. However, In order to successfully predict the hysteresis for a piezoceramic actuator system, the model, its identification and implementation must take into account the differences in the hysteretic behavior of ferromagnetic and piezoceramic materials. In this research, a modified geometric interpretation and numerical implementation method has been developed to describe the phenomenon of the piezoceramic hysteresis. A new type of dynamic Preisach model has also been proposed by introducing the dependence of the Preisach function on the input variation rate. Finally, in order to simplify and generalize the identification process, a new approach, Wavelet identification for Preisach model, is presented in this dissertation.; The level of performance of the new approaches has been tested by comparing the experimental results to those predicted by the models. The results of this comparison show that the improved Preisach model can be successfully used to predict the hysteresis response of piezoceramic actuator systems. |
