arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1709.09735cs.ROcs.AIstat.ML
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机器人辅助穿衣的深度触觉模型预测控制

Deep Haptic Model Predictive Control for Robot-Assisted Dressing

Georgia Institute of Technology(佐治亚理工学院)

Zackory Erickson, Henry M. Clever, Greg Turk, C. Karen Liu, Charles C. Kemp

摘要:

机器人辅助穿衣为许多残疾人(如一些老年人)的生活提供了一个机会。然而,机器人目前缺乏关于其行为对人类的物理影响的常识。非刚性服装使着装的物理含义变得复杂,这可能导致机器人间接地对人体施加很大的力。我们提出了一个深度循环模型,当机器人给出一个建议的动作时,预测服装将施加到人体上的力。我们还表明,机器人可以提供更好的穿衣援助,通过使用此模型与模型预测控制。我们的模型所作的预测只使用触觉和运动学观察机器人的末端执行器,这是很容易实现的。从真实世界的物理人机交互中收集训练数据可能是耗时的,昂贵的,并使人处于危险之中。相反,我们训练我们的预测模型,使用从基于物理的模拟中以完全自我监督的方式收集的数据。我们用PR2机器人评估了我们的方法,该机器人试图将医院的长袍拉到10名人类参与者的手臂上。在0.2秒的预测范围内,我们的控制器成功地以高速率和降低施加的力,同时在人的拳头和肘部周围导航服装而不会被抓住。较短的预测范围导致参与者的拳头和肘部的袖子明显减少,这证明了我们模型预测的价值。这些减轻捕获的行为来自我们的深度预测模型和控制器目标函数,该目标函数主要惩罚高力量。

英文摘要:

Robot-assisted dressing offers an opportunity to benefit the lives of many people with disabilities, such as some older adults. However, robots currently lack common sense about the physical implications of their actions on people. The physical implications of dressing are complicated by non-rigid garments, which can result in a robot indirectly applying high forces to a person's body. We present a deep recurrent model that, when given a proposed action by the robot, predicts the forces a garment will apply to a person's body. We also show that a robot can provide better dressing assistance by using this model with model predictive control. The predictions made by our model only use haptic and kinematic observations from the robot's end effector, which are readily attainable. Collecting training data from real world physical human-robot interaction can be time consuming, costly, and put people at risk. Instead, we train our predictive model using data collected in an entirely self-supervised fashion from a physics-based simulation. We evaluated our approach with a PR2 robot that attempted to pull a hospital gown onto the arms of 10 human participants. With a 0.2s prediction horizon, our controller succeeded at high rates and lowered applied force while navigating the garment around a persons fist and elbow without getting caught. Shorter prediction horizons resulted in significantly reduced performance with the sleeve catching on the participants' fists and elbows, demonstrating the value of our model's predictions. These behaviors of mitigating catches emerged from our deep predictive model and the controller objective function, which primarily penalizes high forces.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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