摘要
使用压电陶瓷作驱动元部件的快速伺服刀架是一种新的加工手段。本文介绍了基于Preisach模型的快速伺服刀架迟滞特性建模方法。作为快速伺服刀架的驱动元部件,压电陶瓷微位移器自身的迟滞、蠕变等非线性特性严重影响了快速伺服刀架的动态性能。为了精确建立快速伺服刀架的迟滞模型,给出了Preisach模型的数字表达方式,通过一系列实验测得的数据证明快速伺服刀架系统具有一致特性与擦除特性,满足Preisach模型的两个必要条件,最后在实验数据的基础上建立了基于Preisach模型的迟滞特性模型。实验表明,该迟滞模型可以很好地预测快速伺服刀架的迟滞位移曲线,其预测误差不超过0.65μm。
A fast tool servo mechanism with a piezoelectric actuator has attracted more attention for its excellent machining way and high resolution. In this paper, the classical Preisach hysteresis modeling for a Fast Tool Servo （FTS） system subjected to the dynamic voltage excitations is presented. As a universal driving element for the FTS system, the piezoelectric actuator exhibits specific nonlinearity from the hysteresis effect between the displacement and the applied electric field, which is a key factor limiting the dynamic performance of the FTS system. To establish a mathematical model to describe the hesteresis for the FTS system,the numerical expressions of the classical Preisach model are presented in details, and a series of test are conducted to study the hysteresis property and to find out the congruency and wipe-out properties of the FTS system. Finally, the classical Preisach model is applied to simulate the hysteresis behavior of the FTS system. Experimental results indicate that the measured curves are good agrement with the predicted curves, which shows that the classical Preisach model can offer excellent modeling accuracy less than 0.65μm and can provide many applications for requiring voltage excitation signals with narrow band frequencies.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2009年第6期1421-1425,共5页
Optics and Precision Engineering
基金
Supported by the National High-Tech Research and Development Program of China (863 Program)(Grant No .2006AA04Z314)
