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| Impedance control technology of assembly robot based on active disturbance rejection |
Shi-yu ZHANG( ),Dong-sheng CHEN*(),Ying-hui SONG |
| Institute of Mechanical Manufacturing Technology, China Academy of Engineering and Physics, Mianyang 621900, China |
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Abstract An improved active disturbance rejection impedance control strategy was proposed, in order to improve the accuracy and flexibility of robot assembly operations. In this strategy, the new expected force was generated by the active disturbance rejection controller to adjust the position of the robot's end tool coordinate system, and achieve the accurate force tracking. The environmental information was observed by the disturbance observer and the expected force of the control system was compensated to improve the adaptability of the control system to environmental parameters. The impedance model was introduced to improve the disturbance observer, which increased the response speed of the observer and improved the precision of force tracking. The experimental results of precision peg-in-hole assembly based on 6-DOF robot showed that the impedance control based on active disturbance rejection control (ADRC) could complete the assembly with less contact force error to traditional impedance control, and the force average error of the impedance control based on improved ADRC was reduced by 12.0% to 28.2% compared with that before the improvement.
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Received: 06 September 2021
Published: 28 September 2022
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Corresponding Authors:
Dong-sheng CHEN
E-mail: 13980692301@163.com;13518311304@163.com
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基于自抗干扰的装配机器人阻抗控制技术
为了提升机器人装配作业的精确性和柔顺性，提出改进型自抗扰阻抗控制策略. 该策略通过自抗扰控制器生成新期望力来调整机器人末端工具坐标系的位置，实现精确的力跟踪. 通过扰动观测器观测环境信息并补偿控制系统的期望力，提高控制系统对环境参数的适应性. 引入阻抗模型改进扰动观测器，使观测器的响应速度增大，力跟踪的精度提高. 基于六自由度机器人的精密轴孔装配实验结果表明，与传统阻抗控制相比，基于自抗扰控制（ADRC）的阻抗控制能够在较小的接触力误差下完成装配，且基于改进型自抗扰控制的阻抗控制的力平均误差比改进前自抗扰控制减小12.0%~28.2%.
关键词：
轴孔装配,
柔顺装配,
阻抗控制,
自抗扰控制(ADRC),
机器人
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