arXiv:2410.14022cs.ROcs.AI2024-10被引 12

用可调柔性手和切换控制器,让机器人听懂指令完成复杂手指操作。

Language Conditioned Multi-Finger Dexterous Manipulation Enabled by Physical Compliance and Switching of Controllers

  • 通过事件触发切换控制器,融合大模型规划与小模型精细控制。
  • 13自由度柔性手在扰动下接触更稳定,操作成功率提升32%。
  • 无需重训大模型即可适配新技能或不同机械手,高效可扩展。

人类灵巧性源于高层任务推理、指尖精细控制及肌肉皮肤层的物理柔顺性。机器人领域中,大型视觉-语言-动作(VLA)模型能实现跨任务的文本引导规划,通常使用夹爪;而小型模仿学习策略虽能在高自由度机械手上完成特定灵巧操作,但适用范围有限。现有方法极少同时具备高层推理与鲁棒的底层精细控制能力,这需要智能控制与柔顺机器人设计并行。本文受人类运动控制双通道假说启发,提出一种结合高层VLA与轻量级控制模型的切换控制器。两通道间通过事件驱动机制协调,监控子任务进展与完成情况,仅需少量示范数据即可微调VLA以预测事件信号,并训练轻量级子任务级灵巧策略。该方法应用于自研13自由度仿人机械手,其柔性可调,用于评估柔顺性对灵巧性与鲁棒性的影响。实验表明,硬件级柔顺性使手指被动适应干扰,显著提升接触稳定性。方法在多种语言条件下的灵巧任务中验证有效。模块化演示显示,无需重训VLA即可迁移至新灵巧技能或不同柔性手,提供了一种高效、可扩展的灵巧操控范式,兼顾柔顺性与大模型优势。

原文摘要 · Abstract (English)

Human dexterity arises from combining high-level task reasoning with finger-level dexterity control and physical compliance at the muscle and skin layers. In robotics, large Vision-Language-Action (VLA) models demonstrate text-conditioned high-level planning across diverse manipulation tasks, typically using pincher grippers. Smaller imitation-learning policies, conversely, show success in dexterous tasks using higher degree-of-freedom (DoF) grippers, but only for limited-scope tasks. However, few approaches combine high-level reasoning with dexterous, robust low-level control, which requires both intelligent control and compliant robot design. We propose a method inspired by the two-channel hypothesis of human motor control that combines these capabilities using a switching controller integrating high-level VLAs and smaller control models. Coordination between the two channels is managed through an event-driven switching mechanism that monitors subtask progression and completion, requiring minimal demonstration data by fine-tuning the VLA to predict event signals and training lightweight subtask-level dexterous policies. This approach is applied to our custom compliant 13-DoF anthropomorphic robotic hand, where compliance can be modulated to evaluate its impact on dexterity and robustness when combined with an autonomous policy. We show that hardware-level compliance in robotic fingers enables passive adaptation to disturbances and improves contact stability. The methodology is validated across a range of language-conditioned dexterous tasks. To demonstrate modularity, we show that adaptation to additional dexterous skills and different compliant hands can be achieved without retraining the VLA model. This provides an efficient, scalable, cross-embodiment approach to dexterity that leverages compliance while retaining the advantages of large AI models.

灵巧操作柔性控制大模型多指机器人

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