What is it about?
Piezoelectric actuators wander from their commanded position because of hysteresis — worse, the hysteresis is asymmetric and changes with operating speed. We developed a modified Bouc-Wen model capturing this asymmetric, rate-dependent behavior, then built a digital inverse controller around it, cascaded in the feedforward path. To absorb modeling errors and parameter drift, the inverse controller is paired with a feedback loop in a hybrid scheme. Experiments showed significantly reduced tracking errors compared to conventional compensation.
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Why is it important?
Precise piezo motion underpins nanopositioning, AFM, and precision manufacturing. Compensation that respects the true asymmetric, rate-dependent character of hysteresis delivers accuracy that symmetric models cannot — at little added computational cost.
Perspectives
Hysteresis is the piezo actuator's stubborn memory. Modeling it as asymmetric and rate-dependent felt pedantic — until the tracking errors collapsed.
Professor Wei Li
Huazhong University of Science and Technology
Read the Original
This page is a summary of: Inverse compensation for hysteresis in piezoelectric actuator using an asymmetric rate-dependent model, Review of Scientific Instruments, November 2013, American Institute of Physics,
DOI: 10.1063/1.4833399.
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