应用科学学报 ›› 2016, Vol. 34 ›› Issue (6): 789-798.doi: 10.3969/j.issn.0255-8297.2016.06.014

• 控制与系统 • 上一篇    

基于力矩变换的PAA型欠驱动机器人鲁棒镇定控制

潘昌忠, 周兰, 周少武, 肖小石   

  1. 湖南科技大学信息与电气工程学院, 湖南 湘潭 411201
  • 收稿日期:2016-03-21 修回日期:2016-07-30 出版日期:2016-11-30 发布日期:2016-11-30
  • 作者简介:潘昌忠,博士,讲师,研究方向:机器人控制、非线性系统控制,E-mail:cpan@hnust.edu.cn
  • 基金资助:

    国家自然科学基金(No.61403135,No.51577057,No.61403134);湖南省教育厅资助项目基金(No.14C0440)资助

Robust Stabilization Control of Underactuated PAA Robot Based on Torque Transformation

PAN Chang-zhong, ZHOU Lan, ZHOU Shao-wu, XIAO Xiao-shi   

  1. School of Information and Electrical Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan Province, China
  • Received:2016-03-21 Revised:2016-07-30 Online:2016-11-30 Published:2016-11-30

摘要:

针对在第2 关节和第3 关节仅有两个驱动器的PAA(passive-active-active)型欠驱动三连杆机器人,提出一种基于力矩变换的鲁棒镇定控制方法. 首先对第3 关节的控制输入引入一种与第2 关节控制输入和机器人状态相关的力矩变换,以消除第3 关节控制输入对系统的影响,将机器人动力学方程化为更简单的形式,然后基于能量进行摇起控制设计. 在平衡区,将机器人第1 连杆和第2 连杆的角速度看成一种不确定性,得到机器人在不稳定平衡点附近的不确定模型;然后基于线性矩阵不等式推导鲁棒镇定状态反馈控制律,达到较大范围的平衡控制. 仿真结果表明,该控制方法具有稳定时间短和控制力矩小等优点.

关键词: 欠驱动机器人, 鲁棒控制, 摇起控制, 线性矩阵不等式

Abstract:

Robust stabilization control based on torque transform is proposed for an underactuated three-link manipulator, named a passive-active-active (PAA) robot. It is equipped with only two actuators on the second and third joints. A torque transform,as a function of control input of the second joint and state of the robot,is used for the control input of the third joint. The robot dynamics is transformed to a simpler form,where the influence of control input of the third joint is explicitly eliminated. An energy-based swingup control law is then designed. In the balancing area,an uncertain model is obtained by treating velocities of the first and second links around the unstable equilibrium as uncertainties. A robust stabilizing state feedback control law is derived to reach a large balancing region based on a technique of linear matrix inequality (LMI). Simulation results show that the proposed approach has advantages of short settling time and small control torques.

Key words: swing-up control, linear matrix inequality (LMI), underactuated manipulator, robust control

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