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Title: Discrete composite control of piezoelectric actuators for high-speed and precision scanning
Authors: Liu, L.
Tan, K.K. 
Chen, S.
Teo, C.S.
Lee, T.H. 
Keywords: Discrete composite control
Dynamic hysteresis
Model-based inversion
Piezoelectric actuator
Issue Date: May-2013
Source: Liu, L., Tan, K.K., Chen, S., Teo, C.S., Lee, T.H. (2013-05). Discrete composite control of piezoelectric actuators for high-speed and precision scanning. IEEE Transactions on Industrial Informatics 9 (2) : 859-868. ScholarBank@NUS Repository.
Abstract: 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. © 2012 IEEE.
Source Title: IEEE Transactions on Industrial Informatics
ISSN: 15513203
DOI: 10.1109/TII.2012.2221468
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