可模块化扩展的柔性机械手,支持长期软体机器人数据采集与强化学习。
1 Modular Parallel Manipulator for Long-Term Soft Robotic Data Collection
- 采用通用电机驱动可定制柔顺并联结构,灵活适配多种软体设计。
- 直接在硬件上完成策略梯度强化学习,实现2D抓取任务稳定训练。
- 支持多指扩展,提供兼容性设计约束,便于集成软传感器与执行器。
在软体机器人领域,长期实验或大规模数据采集面临硬件耐用性与实验灵活性的挑战。本文提出一种模块化并联机械操作平台,适用于大规模数据收集,兼容多种软体机器人制造方法。平台由一对现成电气电机驱动,通过可定制的柔性并联结构实现动作,该结构可简化为单个3D打印聚氨酯或模压硅胶块体,因电机能完全驱动被动结构。此设计灵活性支持对不同几何形状、本体属性及表面特性的软体机构进行实验。尽管并联机构无需额外电子元件或零件,但可集成,且可使用多功能软材料构建,以研究学习过程中兼容的软传感器与执行器。本文验证了该平台可在基准2D抓取任务中直接于硬件上进行策略梯度强化学习。同时展示了多指兼容性,并量化了可扩展设计的约束条件。
原文摘要 · Abstract (English)
Performing long-term experimentation or large-scale data collection for machine learning in the field of soft robotics is challenging, due to the hardware robustness and experimental flexibility required. In this work, we propose a modular parallel robotic manipulation platform suitable for such large-scale data collection and compatible with various soft-robotic fabrication methods. Considering the computational and theoretical difficulty of replicating the high-fidelity, faster-than-real-time simulations that enable large-scale data collection in rigid robotic systems, a robust soft-robotic hardware platform becomes a high priority development task for the field. The platform's modules consist of a pair of off-the-shelf electrical motors which actuate a customizable finger consisting of a compliant parallel structure. The parallel mechanism of the finger can be as simple as a single 3D-printed urethane or molded silicone bulk structure, due to the motors being able to fully actuate a passive structure. This design flexibility allows experimentation with soft mechanism varied geometries, bulk properties and surface properties. Additionally, while the parallel mechanism does not require separate electronics or additional parts, these can be included, and it can be constructed using multi-functional soft materials to study compatible soft sensors and actuators in the learning process. In this work, we validate the platform's ability to be used for policy gradient reinforcement learning directly on hardware in a benchmark 2D manipulation task. We additionally demonstrate compatibility with multiple fingers and characterize the design constraints for compatible extensions.
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