arXiv:2409.11144cs.ROcs.LG2024-09ICRA被引 4

让机器人运动轨迹实时感知受力,提升打磨装配等操作的精度与稳定性。

Use the Force, Bot! -- Force-Aware ProDMP with Event-Based Replanning

  • 基于力反馈动态重规划轨迹,融合位置与力的关联信息。
  • 在插销和电源插头任务中成功率显著高于传统方法。
  • 适用于多轴力控场景,适合工业装配等接触密集型任务。

运动基元(MPs)是表示和生成模块化机器人轨迹的成熟方法。本文提出FA-ProDMP,一种将力感知引入概率动态运动基元(ProDMP)的新方法。该方法在运行时根据实测和期望力自适应调整轨迹,生成平滑路径,并捕捉多条人类示范中的位置与力相关性。FA-ProDMP支持多轴力控制,因此不依赖于笛卡尔空间或关节空间的限制。这使其成为从示范学习高接触性操作任务(如抛光、切割、工业装配)的有力工具。为可靠评估,本文还构建了一个模块化3D打印任务套件POEMPEL,灵感源自乐高技术拼插件,模拟具有力要求的工业插销任务。该套件可调节位置、姿态及插件刚度,从而改变所需力的方向与大小。实验表明,在POEMPEL和电气插头插入任务中,由于基于实测力的重规划能力,FA-ProDMP优于其他基元模型,验证了其在接触密集型操作中的性能提升。

原文摘要 · Abstract (English)

Movement Primitives (MPs) are a well-established method for representing and generating modular robot trajectories. This work presents FA-ProDMP, a new approach which introduces force awareness to Probabilistic Dynamic Movement Primitives (ProDMP). FA-ProDMP adapts the trajectory during runtime to account for measured and desired forces. It offers smooth trajectories and captures position and force correlations over multiple trajectories, e.g. a set of human demonstrations. FA-ProDMP supports multiple axes of force and is thus agnostic to cartesian or joint space control. This makes FA-ProDMP a valuable tool for learning contact rich manipulation tasks such as polishing, cutting or industrial assembly from demonstration. In order to reliably evaluate FA-ProDMP, this work additionally introduces a modular, 3D printed task suite called POEMPEL, inspired by the popular Lego Technic pins. POEMPEL mimics industrial peg-in-hole assembly tasks with force requirements. It offers multiple parameters of adjustment, such as position, orientation and plug stiffness level, thus varying the direction and amount of required forces. Our experiments show that FA-ProDMP outperforms other MP formulations on the POEMPEL setup and a electrical power plug insertion task, due to its replanning capabilities based on the measured forces. These findings highlight how FA-ProDMP enhances the performance of robotic systems in contact-rich manipulation tasks.

力控运动基元机器人操作动态重规划

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