Adaptive feed-forward hysteresis compensation for piezoelectric actuators

Area of Science:

• Engineering
• Materials Science
• Control Systems

Background:

• Piezoelectric actuators are crucial for high-resolution positioning.
• Hysteresis and creep nonlinearities degrade their accuracy.
• Accurate control is essential for precision applications.

Purpose of the Study:

• To develop an online adaptive nonlinear hysteresis compensation scheme.
• To address symmetric hysteretic responses in piezoelectric actuators.
• To improve the positioning accuracy of these actuators.

Main Methods:

• An online adaptive nonlinear compensation algorithm was developed.
• The scheme targets symmetric hysteretic behavior.
• It is designed for real-time implementation with low complexity.

Main Results:

• Experimental verification demonstrated the method's effectiveness.
• Hysteresis-induced error was reduced by over 90% compared to linear models.
• The compensation scheme proved successful in enhancing accuracy.

Conclusions:

• The proposed adaptive scheme effectively compensates for piezoelectric actuator hysteresis.
• This method offers a practical solution for improving precision in positioning systems.
• The low complexity makes it suitable for real-time control applications.