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Fei Dong
Beijing
Public Documents
1
A Deep Serial Model and Predictive Control for Piezo-actuated Positioning Stages
Fei Dong
and 4 more
September 18, 2024
The inherent hysteresis nonlinearity of piezoactuated positioning stages (piezo-stages) is very difficult to deal with due to the amplitude-and frequency-dependent characteristics, which severely limits the tracking accuracy for high speed trajectories. In this work, we first develop a deep serial model to describe the dynamics of the piezo-stage by using historical voltage-displacement data over a period of time. It achieves relative prediction errors less than 0.16% on sinusoidal trajectories with frequencies greater than 72% of the resonance frequency of the piezo-stage through an elaborately designed network structure that includes direct connections between the input layer and the output layer. Then, we design an integral model predictive control (iMPC) and build a feedforward neural network (FNN) to learn its optimal solution offline. This forms the proposed FNN-iMPC and ensures the feasibility of evaluating the control law within the sampling time of 0.1ms. It achieves a maximum positioning error of 0.02µm for a ±32µm staircase reference signal and a maximum tracking error of 0.19µm for a sinusoidal reference signal with a range of 10µm and a frequency of 500Hz in real experiments.