中国机械工程 ›› 2025, Vol. 36 ›› Issue (11): 2563-2573.DOI: 10.3969/j.issn.1004-132X.2025.11.011

• 机械基础工程 • 上一篇    

基于扰动观测和摩擦补偿的气动摆角伺服系统滑模控制

魏琼, 白林勇, 陈子超, 张道德, 李奕()   

  1. 湖北工业大学机械工程学院, 武汉, 430068
  • 收稿日期:2024-06-02 出版日期:2025-11-25 发布日期:2025-12-09
  • 通讯作者: 李奕
  • 作者简介:魏琼,女,1980年生,副教授。研究方向为流体传动控制、机电伺服系统设计。E-mail:20140058@hbut,edu.cn。
  • 基金资助:
    国家自然科学基金(51905159);国家自然科学基金(52075152)

Sliding Mode Control for Pneumatic Swing Angle Servo Systems Based on Disturbance Observation and Friction Compensation

Qiong WEI, Linyong BAI, Zichao CHEN, Daode ZHANG, Yi LI()   

  1. School of Mechanical Engieering,Hubei University of Technology,Wuhan,430068
  • Received:2024-06-02 Online:2025-11-25 Published:2025-12-09
  • Contact: Yi LI

摘要:

外部不确定扰动与摩擦是影响气动摆角伺服系统控制性能的重要因素(分别引起局部波动与爬行现象)。提出了一种基于扰动观测和摩擦补偿的滑模控制策略,设计一种引入类双曲正切函数和角速度误差项的改进扩张状态观测器对外部不确定扰动进行观测,以提高系统抗扰能力。由于观测器不能有效地观测系统摩擦的静-动高阶突变,导致爬行现象不能有效改善,因此对摩擦力矩进行辨识以弥补观测不足。最后,针对系统存在鲁棒性较差的问题,设计一种非奇异快速滑模控制器,利用含积分特性的超螺旋算法平滑控制量来改善滑模控制中的固有抖振问题,并将扰动观测值和摩擦力矩辨识值进行反馈补偿。仿真与实验结果表明,与4种控制策略相比,所设计的控制方法有效增强了系统的抗扰能力,并提高了气动摆角伺服系统轨迹跟踪性能。

关键词: 气动摆角伺服系统, 摩擦补偿, 扰动观测, 非奇异快速滑模, 超螺旋算法

Abstract:

External uncertain disturbances and friction were important factors affecting the control performance of pneumatic swing angle servo systems(causing local fluctuations and creep phenomena). A sliding mode control strategy was proposed based on disturbance observation and friction compensation, an improved extended state observer was designed to observe external uncertain disturbances by introducing a hyperbolic tangent function and angular velocity error term to enhance the disturbance rejection ability of systems. Since the observer might not effectively observe the static-dynamic high-order jump of system friction, which leaded to ineffective improvement of the creep phenomenon, therefore the friction torques were identified to make up for the insufficient observation. Finally, aiming at the insufficient robustness and difficulty in tuning control parameters of the systems, a nonsingular fast sliding mode controller was designed. The controller outputs were smoothed by using the super-twisting algorithm with integral characteristics to improve the inherent chattering problems in sliding mode control, and the disturbance observation values and friction torque identification values were feedback compensated. Simulation and experimental results show that compared with four control strategies, the proposed control method effectively enhances the disturbance rejection ability of the systems and improves the trajectory tracking performance of the pneumatic swing angle servo systems.

Key words: pneumatic swing angle servo system, friction compensation, disturbance observation, nonsingular fast sliding mode, super-twisting algorithm

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