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2 results on '"Wu, HongTao"'

1. Discrete-Time Predictive Sliding Mode Control for a Constrained Parallel Micropositioning Piezostage.

Author

Kang, Shengzheng, Wu, Hongtao, Yang, Xiaolong, Li, Yao, Yao, Jiafeng, Chen, Bai, and Lu, Huimin

Subjects
*SLIDING mode control, *PIEZOELECTRIC actuators, *CLOSED loop systems
Abstract

This article proposes a new discrete-time predictive sliding mode control (DPSMC) for a parallel micropositioning piezostage to improve the motion accuracy in the presence of cross-coupling hysteresis nonlinearities and input constraints. Unlike the traditional linear discrete-time sliding mode control (DSMC), the proposed DPSMC is chattering free and has a faster convergence rate thanks to the design of a nonlinear discrete-time fast integral terminal sliding mode surface. Moreover, by combining with the receding horizon optimization, the sliding mode state is predicted to follow the expected trajectory of a predefined continuous sliding mode reaching law, which also allows the proposed controller to explicitly deal with constraints. The stability of the closed-loop system is analyzed under the model disturbances and constraints, and proves that the proposed DPSMC can offer a smaller quasi-sliding mode bandwidth than the traditional DSMC. The effectiveness of the proposed controller is validated by a series of numerical simulations and experiments. Results demonstrate the advantages of proposed DPSMC over the traditional DSMC method. [ABSTRACT FROM AUTHOR]

Published
2022
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2. Improved Sliding Mode Control With Time Delay Estimation for Motion Tracking of Cell Puncture Mechanism.

Author

Xie, Mingyang, Yu, Shengdong, Lin, Haiping, Ma, Jinyu, and Wu, Hongtao

Subjects
TIME delay estimation, TIME delay systems, SLIDING mode control, MOTION control devices, PARAMETER identification, PIEZOELECTRIC ceramics, PID controllers
Abstract

In this study, a cell puncture mechanism driven by a piezoelectric ceramic (PEA) is fabricated, and a novel precision robust motion controller is proposed to complete the cell puncture. A system dynamics model of the cell puncture mechanism is simplified by considering the hysteresis and disturbance as unknown terms to avoid the parameter identification of nonlinear dynamics in engineering applications. A sliding mode control (SMC) strategy with fast reaching law and proportional-integral- differential (PID)-type sliding surface, denoted as FPIDSMC, based on the simplified Bouc–Wen model is combined with time delay estimation (TDE) technology to form a novel controller, called FPID-TDE controller in this study. The stability of the controller is proven based on the Lyapunov theory. Computer simulation and semi-physical simulation experiments show the TDE technology can estimate and compensate accurately the unknown terms and does not require prior knowledge of unknown disturbance boundaries, thereby reducing controller gain. SMC can realize fast response speed, few steady-state errors, continuous output, and avoid chattering. Through a micropuncture experiment of a zebrafish embryo, the proposed FPID-TDE controller is shown to have high efficiency, high precision, and strong robustness. Therefore, the proposed FPID-TDE controller can be applied effectively to other micro nano-positioning systems driven by PEA. [ABSTRACT FROM AUTHOR]

Published
2020
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