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An improved approach of task-parameterized learning from demonstrations for cobots in dynamic manufacturing
Journal of Intelligent Manufacturing ( IF 8.3 ) Pub Date : 2021-02-06 , DOI: 10.1007/s10845-021-01743-w
Shirine El Zaatari , Yuqi Wang , Yudie Hu , Weidong Li

Task-Parameterized Learning from Demonstrations (TP-LfD) is an intelligent intuitive approach to support collaborative robots (cobots) for various industrial applications. Using TP-LfD, human’s demonstrated paths can be learnt by a cobot for reproducing new paths for the cobot to move along in dynamic situations intelligently. One of the challenges to applying TP-LfD in industrial scenarios is how to identify and optimize critical task parameters of TP-LfD, i.e., frames in demonstrations. To overcome the challenge and enhance the performance of TP-LfD in complex manufacturing applications, in this paper, an improved TP-LfD approach is presented. In the approach, frames in demonstrations are autonomously chosen from a pool of generic visual features. To strengthen computational convergence, a statistical algorithm and a reinforcement learning algorithm are designed to eliminate redundant frames and irrelevant frames respectively. Meanwhile, a B-Spline cut-in algorithm is integrated in the improved TP-LfD approach to enhance the path reproducing process in dynamic manufacturing situations. Case studies were conducted to validate the improved TP-LfD approach and to showcase the advantage of the approach. Owing to the robust and generic capabilities, the improved TP-LfD approach enables teaching a cobot to behavior in a more intuitive and intelligent means to support dynamic manufacturing applications.



中文翻译:

动态制造中协作机器人演示的任务参数化学习的一种改进方法

任务参数化的演示学习(TP-LfD)是一种智能的直观方法,可为各种工业应用程序支持协作机器人(cobot)。使用TP-LfD,协作机器人可以学习人类演示的路径,从而为协作机器人在动态情况下智能移动提供新的路径。在工业场景中应用TP-LfD的挑战之一是如何识别和优化TP-LfD的关键任务参数,即演示中的帧。为了克服挑战并提高TP-LfD在复杂制造应用中的性能,本文提出了一种改进的TP-LfD方法。在这种方法中,演示中的帧是从一组通用的视觉特征中自主选择的。为了加强计算收敛,设计了统计算法和强化学习算法分别消除冗余帧和无关帧。同时,在改进的TP-LfD方法中集成了B样条插入算法,以增强动态制造情况下的路径重现过程。进行了案例研究,以验证改进的TP-LfD方法并展示该方法的优势。由于具有强大的通用功能,经过改进的TP-LfD方法可以使协作机器人以更直观,更智能的方式教导行为,以支持动态制造应用。在改进的TP-LfD方法中集成了B样条插入算法,以增强动态制造情况下的路径再现过程。进行了案例研究,以验证改进的TP-LfD方法并展示该方法的优势。由于具有强大的通用功能,经过改进的TP-LfD方法可以使协作机器人以更直观,更智能的方式教导行为,以支持动态制造应用。在改进的TP-LfD方法中集成了B样条插入算法,以增强动态制造情况下的路径再现过程。进行了案例研究,以验证改进的TP-LfD方法并展示该方法的优势。由于具有强大的通用功能,经过改进的TP-LfD方法可以使协作机器人以更直观,更智能的方式教导行为,以支持动态制造应用。

更新日期:2021-02-07
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