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机器人柔性关节前馈力/位混合控制策略研究
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南方电网公司科技资助项目(GZHKJXM20180069)


Research on Feed Forward Force/Position Hybrid Control Strategy of Robot Flexible Joint
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    摘要:

    针对机器人关节柔性引起的轨迹跟踪误差问题和末端执行器残余振动现象,在PD反馈控制律基础上,提出一种基于柔体动力学模型的前馈力矩补偿控制算法和后置多模态自适应输入整形算法前馈力/位混合控制策略。建立六轴工业机器人柔体动力学简化模型,在不附加关节编码器和外设的情况下进行柔体动力学参数辨识,再将动力学模型改写为力矩计算方程,经计算得到前馈力矩并加入控制律中进行补偿;计算前馈力矩所用的期望轨迹需经过输入整形器处理,考虑机器人系统的时变性问题,采用后置多模态自适应输入整形算法对期望输入位移信号进行命令整形,从而抑制末端的残余振动现象。结果表明:所提出的前馈力/位混合控制策略能有效减少轨迹跟踪误差,抑制机器人末端的残余振动现象。

    Abstract:

    Aiming at the problem of trajectory tracking error and residual vibration of end effector caused by the robot joint flexibility,combined with the simplified dynamic model of industrial robot,a feed forward force/position hybrid control strategy was proposed based on PD feedback control law.The control strategy was based on the feed forward torque compensation control algorithm of the flexible body dynamics model and the post multimode adaptive input shaping algorithm.A simplified dynamic model of flexible body of six axis industrial robot was established,and the dynamic parameters of flexible body were identified without additional joint encoder and peripherals,the dynamic model was rewritten into the torque calculation equation,and the feed-forward torque was calculated and added into the control law for compensation;the desired trajectory used to calculate the feed-forward torque needed to be processed by input shaper,and considered the time-varying problem of industrial robot system,the post multimode adaptive input shaping algorithm was used to shape the desired input displacement signal,so the residual vibration of the end effector was suppressed.The results show that by using the proposed hybrid control strategy,the trajectory tracking error can be effectively reduced and the residual vibration of the robot end effector can be suppressed.

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尹旷,王红斌,钟连宏,张铁,叶建斌,喇元.机器人柔性关节前馈力/位混合控制策略研究[J].机床与液压,2022,50(11):25-34.
YIN Kuang, WANG Hongbin, ZHONG Lianhong, ZHANG Tie, YE Jianbin, LA Yuan. Research on Feed Forward Force/Position Hybrid Control Strategy of Robot Flexible Joint[J]. Machine Tool & Hydraulics,2022,50(11):25-34

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  • 在线发布日期: 2022-08-19
  • 出版日期: 2022-06-15