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arXiv 2208.01547cs.ROcs.SYeess.SY
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软体机器人执行机构的安全监控

Safe Supervisory Control of Soft Robot Actuators

Boston University(波士顿大学);Carnegie Mellon University(卡内基梅隆大学)

Andrew P. Sabelhaus, Zach J. Patterson, Anthony T. Wertz, Carmel Majidi

摘要:

尽管软体机器人与环境的交互比传统机器人更安全,但软体机构和致动器仍有很大的损坏或退化潜力,特别是在未建模接触期间。介绍了一种在软体机器人控制过程中实现软体执行器安全操作的反馈策略。为此,监督控制器监视致动器状态并动态地使控制输入饱和以避免可能导致物理损坏的条件。我们证明了,在一定的条件下,监督控制器是稳定的和可验证的安全。然后,我们展示了完全板载操作的监督控制器使用软热驱动的机器人肢体嵌入式形状记忆合金(SMA)致动器和传感。与主管一起进行的测试验证了其理论特性,并显示了机器人肢体在自由空间中的姿态稳定性。最后,实验表明,我们的方法可以防止过热接触(包括环境约束和人体接触)或不可行的运动时,命令。这种监督控制器,以及它的能力,以执行完全板载传感,有可能使软体机器人执行器足够可靠的实际使用。

英文摘要:

Although soft robots show safer interactions with their environment than traditional robots, soft mechanisms and actuators still have significant potential for damage or degradation particularly during unmodeled contact. This article introduces a feedback strategy for safe soft actuator operation during control of a soft robot. To do so, a supervisory controller monitors actuator state and dynamically saturates control inputs to avoid conditions that could lead to physical damage. We prove that, under certain conditions, the supervisory controller is stable and verifiably safe. We then demonstrate completely onboard operation of the supervisory controller using a soft thermally-actuated robot limb with embedded shape memory alloy (SMA) actuators and sensing. Tests performed with the supervisor verify its theoretical properties and show stabilization of the robot limb's pose in free space. Finally, experiments show that our approach prevents overheating during contact (including environmental constraints and human contact) or when infeasible motions are commanded. This supervisory controller, and its ability to be executed with completely onboard sensing, has the potential to make soft robot actuators reliable enough for practical use.

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