Hysteresis displacement control of piezoceramics based on improved Bouc-Wen model
10.19745/j.1003-8868.2025139
- VernacularTitle:基于改进Bouc-Wen模型的压电陶瓷迟滞位移控制研究
- Author:
Yuan-yuan CHAI
1
;
Wei-guo WANG
;
Xiao-fen LIU
;
Liang-yu CUI
Author Information
1. 武警后勤学院基础部,天津 300309
- Publication Type:Journal Article
- Keywords:
nano-displacement platform;
Bouc-Wen model;
piezoceramics;
piezoceramics actuator;
hysteresis diaplace-ment control;
precision positioning
- From:
Chinese Medical Equipment Journal
2025;46(8):25-31
- CountryChina
- Language:Chinese
-
Abstract:
Objective To propose an improved Bouc-Wen model to alleviate the nonlinear effect of the hysteresis displacement of piezoceramics and enhance the motion control accuracy of the nano-displacement platform.Methods Firstly,two fine-tuning parameters including the asymmetric term and the input bias term were added to the classical Bouc-Wen model to eliminate the deviation of the starting and ending positions of the hysteresis curve,so as to obtain an improved Bouc-Wen model simulating the hysteresis displacement characteristics of piezoceramics on the nano-displacement platform.Secondly,the parameters of the improved Bouc-Wen model were identified based on the particle swarm optimization algorithm,and an inverse feedforward structure was adopted to realize the linearized control of the output displacement.Finally,an experimental system was built to verify the linearized control effect of the improved Bouc-Wen model.Results The hysteresis curve of the improved Bouc-Wen model fitted the actual voltage-displacement curve of piezoceramics significantly better when compared with that of the traditional model,which had a 56%reduction in the fitting error and a 0.03 μm error between the desired and actual displacements during the linearized output control with a driving voltage of 0-60 V and a maximum travel of about 4 μm.Conclusion The improved Bouc-Wen model behaves well in hysteresis displacement fitting and linearized output control,and a new idea is provided for enhancing the motion control accuracy of the nano-displacement platform.[Chinese Medical Equipment Journal,2025,46(8):25-31]
