具有预设性能的板球系统神经超扭曲滑模控制
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作者单位:

1.昆明理工大学;2.昆明理工大学 信息工程与自动化学院

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中图分类号:

TP273?????

基金项目:

国家自然科学基金(61163051)


Neural super-twisting sliding mode control of the ball and plate system with prescribed performance
Author:
Affiliation:

1.Kunming University of Science and Technology;2.Faculty of Information Engineering and Automation,Kunming University of Science and Technology

Fund Project:

National Natural Science Foundation of China(61163051)

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    摘要:

    提出了一种新的具有预设性能的自回归小波神经网络(self-recurrent wavelet neural network,SRWNN)超扭曲非奇异快速终端滑模(STNFTSM)控制方法(SRWNN_STNFTSM),在存在动力学不确定性和未知扰动的情况下提高板球系统的跟踪控制性能。利用预设性能函数(PPF),将板球系统原本受约束的位置误差转换为无约束的误差模型。引入NFTSM滑模面来消除常规终端滑模控制存在的奇异问题,并加入一个tanh函数的补偿项改进NFTSM滑模面,以调节轨迹跟踪的收敛速度和跟踪精度,同时结合超扭曲算法(super-twisting algorithm,STA)设计STNFTSM控制器,以削弱抖振和集总扰动的影响。针对系统存在的集总扰动,为了保证高跟踪精度,结合STNFTSM设计了自适应SRWNN补偿器来消除扰动保证了鲁棒性。通过与现有常规滑模控制相比,仿真验证了SRWNN_STNFTSM具有良好的跟踪性能和鲁棒性,能够对集总扰动下的板球系统进行准确跟踪。

    Abstract:

    A novel self-recurrent wavelet neural network(SRWNN) super-twisting non-singular fast terminal sliding mode (SRWNN_STNFTSM) control method with prescribed performance is proposed to improve the tracking control performance of ball and plate system in the presence of dynamic uncertainties and unknown perturbations. The prescribed performance function (PPF) is used to convert the originally constrained position error of the ball and plate system into an unconstrained error model. The NFTSMC sliding mode surface is introduced to eliminate the singular problem of conventional terminal sliding mode control, and a compensation term of the tanh function is added to improve the NFTSM sliding mode surface to adjust the convergence speed and tracking accuracy of trajectory tracking. Meanwhile the STNFTSM controller is designed in combination with the super-distortion algorithm (STA) to weaken the influence of chattering and lumped disturbance. Aiming at the lumped disturbance of the system, in order to ensure high tracking accuracy, combined with STNFTSM to design an adaptive SRWNN compensator to eliminate disturbances and ensure robustness. Compared with existing conventional sliding mode control, the simulation verifies that SRWNN_STNFTSM has good performance, and can accurately track the ball and plate system under the lumped disturbance.

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历史
  • 收稿日期:2022-05-08
  • 最后修改日期:2022-06-16
  • 录用日期:2022-06-17
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