Robust Nonsingular Terminal Sliding-Mode Control for Nonlinear Magnetic Bearing System
Robust Nonsingular Terminal Sliding-Mode Control for Nonlinear Magnetic Bearing System
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DOI：
10.1109/tcst.2010.2050484
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发表时间：
2011-05
影响因子：
4.8
通讯作者：
Syuan-Yi Chen;F. Lin
中科院分区：
文献类型：
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作者：
Syuan-Yi Chen;F. Lin
提出了一种鲁棒非奇异终端滑模控制（RNTSMC）系统，用于实现非线性推力主动磁轴承（TAMB）系统转子轴向位置的有限时间跟踪控制（FTTC）。与传统的线性滑模控制相比，非线性终端滑模控制具有更快的有限时间收敛性和更高的控制精度。在这项研究中，首先，TAMB系统的工作原理和动态模型，使用线性化的电磁力模型进行了介绍。然后，为TAMB设计了TSMC系统，以实现FTTC。此外，为了克服TSMC的奇异性问题，非奇异终端滑模控制（NTSMC）系统的建议。此外，由于TAMB的控制特性是高度非线性和时变的，RNTSMC系统与递归Hermite神经网络（RHNN）的不确定性估计器的建议，以改善控制性能，增加TAMB控制系统的鲁棒性。使用建议的RNTSMC系统，TAMB的集总不确定度的界不需要事先知道。最后，对各种参考轨迹的跟踪实验结果表明，所提出的RNTSMC实际TAMB应用的有效性。
This study presents a robust nonsingular terminal sliding-mode control (RNTSMC) system to achieve finite time tracking control (FTTC) for the rotor position in the axial direction of a nonlinear thrust active magnetic bearing (TAMB) system. Compared with conventional sliding-mode control (SMC) with linear sliding surface, terminal sliding-mode control (TSMC) with nonlinear terminal sliding surface provides faster, finite time convergence, and higher control precision. In this study, first, the operating principles and dynamic model of the TAMB system using a linearized electromagnetic force model are introduced. Then, the TSMC system is designed for the TAMB to achieve FTTC. Moreover, in order to overcome the singularity problem of the TSMC, a nonsingular terminal sliding-mode control (NTSMC) system is proposed. Furthermore, since the control characteristics of the TAMB are highly nonlinear and time-varying, the RNTSMC system with a recurrent Hermite neural network (RHNN) uncertainty estimator is proposed to improve the control performance and increase the robustness of the TAMB control system. Using the proposed RNTSMC system, the bound of the lumped uncertainty of the TAMB is not required to be known in advance. Finally, some experimental results for the tracking of various reference trajectories demonstrate the validity of the proposed RNTSMC for practical TAMB applications.