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华中科技大学 机械科学与工程学院, 武汉 430074
肖浩扬,男,1998年生,广东珠海人,硕士研究生;主要研究方向为足式机器人控制;15367491983@163.com。
罗欣(通信作者),男,1968年生,湖北咸宁人,教授,博士研究生导师;主要研究方向为复杂机电系统智能控制、智能移动机器人、高性能足式机器人仿生设计与智能控制等;mexinluo@hust.edu.cn。
收稿日期:2024-02-09,
纸质出版日期:2025-06-15
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肖浩扬,钱乐天,罗欣. 考虑关节摩擦特性的足式机器人单腿模型动态参数辨识及控制[J]. 机械传动,2025,49(6):10-18.
XIAO Haoyang,QIAN Letian,LUO Xin. Dynamic parameter identification and control of legged robots’ single-leg model considering joint friction characteristics[J]. Journal of Mechanical Transmission,2025,49(6):10-18.
肖浩扬,钱乐天,罗欣. 考虑关节摩擦特性的足式机器人单腿模型动态参数辨识及控制[J]. 机械传动,2025,49(6):10-18. DOI: 10.16578/j.issn.1004.2539.2025.06.002.
XIAO Haoyang,QIAN Letian,LUO Xin. Dynamic parameter identification and control of legged robots’ single-leg model considering joint friction characteristics[J]. Journal of Mechanical Transmission,2025,49(6):10-18. DOI: 10.16578/j.issn.1004.2539.2025.06.002.
目的
2
足式机器人移动速度和机动性的提升对关节运动跟踪精度提出了高要求。足式机器人关节常在低速段工作,行程较小且换向频繁,传动摩擦的存在给关节控制带来了极大的非线性影响。准确辨识其关节非线性摩擦对提高足式机器人的关节跟踪精度十分重要。
方法
2
针对关节低速运动工况,利用驱动器记录重载四足机器人单腿运动数据,并在个人计算机上对数据进行处理;基于关节实测摩擦特性,建立了关节摩擦分段拟合模型,分步辨识足式机器人的单腿关节摩擦及动力学参数;基于辨识模型,设计了单腿动力学前馈-反馈控制器。
结果
2
在重载四足机器人平台上进行的试验表明,与基于线性摩擦模型的参数辨识法相比,该方法各关节力矩预测误差减小约40%,动力学前馈下的轨迹跟踪精度提升大于60%。
Objective
2
The increasing of the motion speed and the manoeuvrability of legged robots poses high level requirements for joint tracking accuracy. The joints of legged robots often work in the conditions of low speed
small stroke and frequent direction switching. The presence of transmission friction has a strong nonlinear influence on the joint control. Accurately identifying the nonlinear friction of its joints is very important for improving the joint tracking accuracy of legged robots.
Methods
2
For the low-speed motion conditions of joints
the motion data of a single leg of the heavy-load quadruped robot was recorded by the driver
and the data was processed on a personal computer. A segmented fitting model of joint friction was built based on the measured friction characteristics of joints under low-speed motion conditions
and the joint friction and dynamic parameters of single leg of legged robots were identified. Based on the identification results
a feedforward-feedback control strategy was carried out.
Results
2
Tests on a heavy-duty quadruped robot indicate that the prediction error of joint torques utilizing the proposed method is reduced by about 40%
and the trajectory tracking accuracy is improved by more than 60%
comparing to those obtained by the existing identification and control method based on the linear friction model.
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