• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2022, Vol. 58 ›› Issue (19): 68-76.doi: 10.3901/JME.2022.19.068

• 机器人及机构学 • 上一篇    下一篇

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一种6R非球型手腕机器人逆运动学算法研究

罗任峰1,2, 王旭浩3, 张大卫1, 张培伦1, 赵臣1   

  1. 1. 天津大学机械工程学院 天津 300072;
    2. 天津航天机电设备研究所 天津 300301;
    3. 中国民航大学航空工程学院 天津 300300
  • 收稿日期:2021-11-18 修回日期:2022-07-15 出版日期:2022-10-05 发布日期:2023-01-05
  • 通讯作者: 王旭浩(通信作者),男,1989年出生,讲师,硕士研究生导师。主要研究方向为工业喷涂机器人设计与应用技术,民航特种设备。E-mail:xh_wang@cauc.edu.cn
  • 作者简介:罗任峰,男,1988年出生。主要研究方向为工业喷涂机器人。E-mail:1204110172@qq.com;张大卫,男,1962年出生,教授,博士研究生导师。主要研究方向为喷涂机器人设计理论与应用技术,高挡数控机床精度设计与补偿技术、热误差主动控制技术,微纳制造技术。E-mail:medzhang1101@tju.edu.cn
  • 基金资助:
    中央高校基本科研业务费专项资金(3122020030)和天津市智能制造科技重大专项(15ZXZNGX00200)资助项目。

Inverse Kinematics Solution Algorithm of a 6R Robot with Non-spherical Wrist

LUO Renfeng1,2, WANG Xuhao3, ZHANG Dawei1, ZHANG Peilun1, ZHAO Chen1   

  1. 1. School of Mechanical Engineering, Tianjin University, Tianjin 300072;
    2. Tianjin Aerospace Electromechanical Equipment Research Institute, Tianjin 300301;
    3. Aeronautical Engineering College, Civil Aviation University of China, Tianjin 300300
  • Received:2021-11-18 Revised:2022-07-15 Online:2022-10-05 Published:2023-01-05

摘要: 6R非球型手腕喷涂机器人得到了越来越广泛的应用,然而这种机器人的结构不满足Pieper准则,导致该机器人的逆运动学求解困难。对此,提出了一种近似解析法和数值迭代法相结合的6R非球型手腕机器人逆运动学组合算法。首先,根据6R非球型手腕机器人的结构特点近似转化为6R球型手腕机器人,并以等效球型手腕机器人的逆运动学解析解作为近似解,采用基于运动学雅可比矩阵的数值迭代法求解6R非球型手腕机器人的逆运动学精确解。其次,针对等效变换引起机器人有效工作空间减小,从而导致算法失败的问题进行了分析,提出了基于目标位姿偏置的方法提高逆运动学算法的鲁棒性。最后,通过数值仿真验证了所提出的6R非球型手腕机器人逆运动学算法的可靠性和时实性。

关键词: 6R机器人, 非球型手腕, 喷涂机器人, 逆运动学

Abstract: The 6R spray painting robot with non-spherical wrist has been widely used. However, structure of this kind of robot does not satisfy Pieper-Criterion, leading to the inverse kinematics of this robot a very difficult problem. Then, an inverse kinematic algorithm for the 6R robot with non-spherical wrist is proposed by combining the approximate analytical solution and the numerical iterative method. Firstly, according to structure characteristics, the 6R robot with non-spherical wrist is transformed to a 6R robot with spherical wrist. By taking analytical solutions of the spherical wrist robot as approximate solutions, the Jacobian based iterative method is employed to derive the exact solutions of the 6R robot with non-spherical wrist. Secondly, failure of the proposed method caused by the reduction of the workspace due to structure transformation is analyzed. A target end configuration offsetting method is presented to improve the robustness of the proposed inverse kinematics algorithm. Finally, numerical simulations are carried out to prove the effectiveness and efficiency of the proposed inverse kinematic method for the 6R robot with non-spherical wrist.

Key words: 6R robot, non-spherical wrist, spray painting robot, inverse kinematics

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