宏纤维复合材料MFC作动器迟滞非线性分析与补偿方法研究

Hysteresis Nonlinear Analysis and Its Compensation Method of MFC Actuator

作为一种新型的压电纤维复合材料作动器,宏纤维复合材料MFC(Macro fiber composite)具有响应迅速、机电换能效率高、封装完备和环境适应性强等特点,广泛应用于工程结构的振动、主动变形控制的领域。然而压电材料所固有的迟滞非线性特性直接影响着作动器的控制精度和驱动效果。构造MFC作动器驱动的悬臂梁结构的试验系统,建立基于试验数据的PI(Prandtl-Ishlinskii)和修正PI迟滞模型,进而开展针对主动控制的迟滞逆补偿模型研究。通过试验对这两种模型的准确性和逆补偿的有效性进行比较,结果表明修正的PI迟滞模型对MFC作动器的迟滞非线性特性具有良好的补偿结果,修正的PI逆模型的拟合位移是未进行电压补偿控制的2.14倍,是PI逆模型补偿控制的1.56倍。所发展的修正PI迟滞模型研究方法可以推广到其他压电材料迟滞行为的模拟。

As a new of piezoelectric fiber composite actuators, MFC (macro fiber composite) is widely used in active vibration and deformation control of engineering structures due to the advantages of fast response, high electromechanical energy conversion efficiency, good encapsulation, strong environmental adaptability, etc. However, the intrinsic hysteresis nonlinearity of piezoelectric material affects the driven efficiency and the control accuracy. The cantilever beam driven by MFC actuator is taken as the research object. The PI (Prandtl-Ishlinskii) hysteresis model and the modified PI hysteresis model are established based on experimental data. And then, an inverse compensation hysteresis model is developed for active control. The accuracy and the inverse compensation effect of two present models are analyzed and compared by experimental tests. The experimental results indicate that the modified PI hysteresis model have the better compensation effect for the hysteresis nonlinearity of the MFC actuator. The fitting displacement of the compensated PI inverse model compensation control is 2.14 times that of the displacement without the voltage compensation control, and is 1.56 times the displacement of the PI inverse model compensation control. The proposed research strategy of hysteresis nonlinearity can be extended to the analysis of hysteresis behavior of other piezoelectric materials.