Discrete Composite Control of Piezoelectric Actuators for High-Speed and Precision Scanning

The scanning accuracy of piezoelectric mechanisms over broadband frequencies is limited due to inherent dynamic hysteresis. This phenomenon has been a key bottleneck to the use of piezoelectric mechanisms in fast and precision scanning applications. This paper presents a systematic model identificat...

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Bibliographic Details
Published in:IEEE transactions on industrial informatics 2013-05, Vol.9 (2), p.859-868
Main Authors: Liu, Lei, Tan, Kok Kiong, Chen, Silu, Teo, Chek Sing, Lee, Tong Heng
Format: Article
Language:English
Subjects:
Adaptive control
Computational modeling
Control systems
Control theory
Discrete composite control
dynamic hysteresis
Dynamics
Economic models
Feedforward neural networks
Harmonic analysis
Hysteresis
Mathematical model
model-based inversion
piezoelectric actuator
Piezoelectric actuators
Piezoelectricity
Resonant frequency
Scanning
Strategy
Studies
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Summary:The scanning accuracy of piezoelectric mechanisms over broadband frequencies is limited due to inherent dynamic hysteresis. This phenomenon has been a key bottleneck to the use of piezoelectric mechanisms in fast and precision scanning applications. This paper presents a systematic model identification and composite control strategy without hysteresis measurement for such applications. First, least squares estimation using harmonic signals is applied to achieve the Preisach density function. Next, the hysteresis output is estimated, such that the non-hysteretic dynamics can be identified. The discrete composite control strategy is proposed with a feedforward-feedback structure. The feedforward controller is the primary component designed for the performance. The secondary proportional-integral (PI) feedback controller is employed to suppress disturbances for robustness. Finally, the identification and composite control strategy is implemented with a dSPACE 1104 board for a real piezoelectric actuator setup. The experimental results indicate that adequate scanning performance can be sustained at a rate higher than the first resonant frequency.
ISSN:1551-3203
1941-0050
DOI:10.1109/TII.2012.2221468