让机器人皮肤动态调整灵敏度,既安全又提高工作效率。
Adaptive Electronic Skin Sensitivity for Safe Human-Robot Interaction
- 根据机器人各部位速度和有效质量动态调节触觉阈值
- 实测显示最自适应方案使作业效率显著提升
- 适合需要安全人机协作的工业与服务机器人场景
覆盖整个机器人的仿生电子皮肤可实现安全的人机协同。根据协作机器人标准(如ISO/TS 15066),接触时的允许力和压力取决于碰撞速度与机器人的有效质量。为在满足力控安全要求的同时最大化生产效率,保护性皮肤的阈值应针对不同机器人部位个性化设置,并实时动态调整。本文实证评估了四种方案:(a) 静态统一阈值,(b) 静态分区域阈值,(c) 基于各关节速度动态设定,(d) 基于各关节有效质量动态设定。在完全覆盖电子皮肤(AIRSKIN)的6轴协作机械臂(UR10e)上,通过模拟抓取-放置任务中的瞬时碰撞及“停止”或“避让”反应进行测试。结果表明,从最保守的静态统一设置(a)过渡到最自适应的基于有效质量的动态设置(d),显著提升了作业效率。每个皮肤垫的阈值以25 Hz频率更新。该方法可扩展至更多自由度平台和更大覆盖面积(如人形机器人),也适用于以触碰为交互方式的社会化人机协作场景。
原文摘要 · Abstract (English)
Artificial electronic skins covering complete robot bodies can make physical human-robot collaboration safe and hence possible. Standards for collaborative robots (e.g., ISO/TS 15066) prescribe permissible forces and pressures during contacts with the human body. These characteristics of the collision depend on the speed of the colliding robot link but also on its effective mass. Thus, to warrant contacts complying with the Power and Force Limiting (PFL) collaborative regime but at the same time maximizing productivity, protective skin thresholds should be set individually for different parts of the robot bodies and dynamically on the run. Here we present and empirically evaluate four scenarios: (a) static and uniform - fixed thresholds for the whole skin, (b) static but different settings for robot body parts, (c) dynamically set based on every link velocity, (d) dynamically set based on effective mass of every robot link. We perform experiments in simulation and on a real 6-axis collaborative robot arm (UR10e) completely covered with sensitive skin (AIRSKIN) comprising eleven individual pads. On a mock pick-and-place scenario with transient collisions with the robot body parts and two collision reactions (stop and avoid), we demonstrate the boost in productivity in going from the most conservative setting of the skin thresholds (a) to the most adaptive setting (d). The threshold settings for every skin pad are adapted with a frequency of 25 Hz. This work can be easily extended for platforms with more degrees of freedom and larger skin coverage (humanoids) and to social human-robot interaction scenarios where contacts with the robot will be used for communication.
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