Adaptive-Neural-Network-Based Terminal Sliding Mode Control for Six-Axis Robotic Manipulators

JIA Hua; LIU Yanjun; WANG Yu; XUE Gang

doi:10.7652/xjtuxb202211003

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Adaptive-Neural-Network-Based Terminal Sliding Mode Control for Six-Axis Robotic Manipulators

更新时间：2025-07-09

- Adaptive-Neural-Network-Based Terminal Sliding Mode Control for Six-Axis Robotic Manipulators
- Vol. 56, Issue 11, Pages: 21-30(2022)
- 作者机构：
  
  1. 山东大学机械工程学院,济南,250061
  2. 山东大学高效洁净机械制造教育部重点实验室,济南,250061
  3. 山东大学机械工程国家级实验教学示范中心,济南,250061
  4. 山东大学海洋研究院,山东,青岛,266237
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202211003
  CLC： TP241
- Online First：10 November 2022，
  
  Published：2022
- 稿件说明：
移动端阅览
JIA Hua, LIU Yanjun, WANG Yu, et al. Adaptive-Neural-Network-Based Terminal Sliding Mode Control for Six-Axis Robotic Manipulators[J]. 2022, 56(11): 21-30.
DOI：

JIA Hua, LIU Yanjun, WANG Yu, et al. Adaptive-Neural-Network-Based Terminal Sliding Mode Control for Six-Axis Robotic Manipulators[J]. 2022, 56(11): 21-30. DOI： 10.7652/xjtuxb202211003.

摘要

考虑模型不确定且存在外界干扰时六轴机械臂的轨迹跟踪控制问题

以快速、稳定地跟踪轨迹规划生成的各关节期望轨迹为控制目标

提出了一种基于机械臂动力学模型分块逼近的神经网络自适应终端滑模控制方法。为加快跟踪误差的收敛速度

避免传统终端滑模中存在的奇异值问题

采用了一种非奇异终端滑模面。针对系统模型不确定的情况

利用多组RBF神经网络分块逼近动力学模型参数

通过自适应律在线调整权值

实现模型的重构

并设计鲁棒项消除模型重构误差。在Simulink中开展仿真分析

结果表明:与RBF神经网络整体逼近算法相比

本文提出的控制策略可以使六轴机械臂的关节最大稳态误差减少83.7%; 当末端加入时变的负载后

关节最大稳态误差减少了85.6%

具有抵抗末端负载变化的能力。本文为六轴机械臂提供了一种有效、可行的轨迹跟踪控制方法。

Abstract

This paper proposes an adaptive-neural-network-based terminal sliding mode control algorithm based on partitional approximation of dynamic models of robot manipulators to realize tracking of the desired trajectory of each joint generated by trajectory planning of six-axis robot manipulators when models are unknown and there is external disturbance. In addition

a non-singular terminal sliding mode manifold is proposed to accelerate the convergence of the tracking error and avoid the singular problem in the control with the conventional terminal sliding mode. Since the system model is unknown

multi-group RBF neural networks are utilized to approximate the dynamic model parameters

and the model is reconstructed by an adaptive weight update law. The model reconstruction errors are compensated by the designed robust terms. Simulation analysis is carried out in Simulink. According to the analysis results

compared with the RBF neural network global approximation algorithm

the proposed control method can reduce the maximum steady-state error of the manipulator joints by 83.7%. When the time-varying load is added to the end effector

the maximum steady-state error of the joints is reduced by 85.6%. Therefore

the proposed control is an effective and feasible trajectory tracking method for the six-axis robot manipulator under the condition of load variation.

关键词

Keywords

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