• Electronics Optics & Control
  • Vol. 28, Issue 1, 108 (2021)
WU Haitao and LAI Leijie*
Author Affiliations
  • [in Chinese]
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    DOI: 10.3969/j.issn.1671-637x.2021.01.024 Cite this Article
    WU Haitao, LAI Leijie. A Compound Dynamic Feedforward Control Method for New Flexible Amplification Mechanism[J]. Electronics Optics & Control, 2021, 28(1): 108 Copy Citation Text show less

    Abstract

    Micro-displacement driving and control with nano-scale precision are usually achieved by using the piezoelectric ceramic driver to drive the flexible mechanism.However, the travel distance of the piezoelectric ceramic driver is so small that a flexible amplification mechanism is needed to amplify its displacement.The nonlinear characteristics of the piezoelectric ceramic driver such as creeping and hysteresis greatly affect the motion accuracy of the output displacement after being amplified by the amplification mechanism.To solve the above two problems, a new type of flexible amplification mechanism is designed by replacing the four bridge arms of the traditional bridge mechanism with the Scott-Russell mechanism.At the same time, a compound control strategy which combines feedforward control based on the dynamic inverse model with PID feedback control is adopted to improve the control bandwidth and motion accuracy of the amplification mechanism.The experimental results show that, compared with that of the traditional PID feedback control, the RMS tracking error of the compound control strategy is reduced by 33% at 1 Hz input frequency and by 73% at 10 Hz.The compound control strategy which combines feedforward control based on dynamic inverse model with PID feedback control greatly improves the tracking accuracy of the amplification mechanism.
    WU Haitao, LAI Leijie. A Compound Dynamic Feedforward Control Method for New Flexible Amplification Mechanism[J]. Electronics Optics & Control, 2021, 28(1): 108
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