arXiv:2503.06736cs.RO2025-03被引 36

提出一种实时安全机械臂控制框架,兼顾避障与任务执行

Safe, Task-Consistent Manipulation with Operational Space Control Barrier Functions

  • 将操作空间控制与屏障函数结合,实现多约束协同
  • 支持数百个约束同时生效,保持毫秒级响应速度
  • 适合复杂动态场景下的高精度机械臂控制

在非结构化环境中对机械臂进行安全的实时控制,需处理大量安全约束而不影响任务性能。传统方法如人工势场法存在局部极小、振荡和可扩展性差的问题,模型预测控制则计算成本高。控制屏障函数(CBFs)因其高鲁棒性和低计算开销成为有前景的替代方案,但其安全滤波器设计不当会显著降低机械臂整体性能。本文提出操作空间控制屏障函数(OSCBF)框架,在保证任务一致性的同时集成安全约束。该方法可扩展至数百个并行约束,仍维持实时控制速率,确保在密集杂乱环境或动态运动中实现碰撞避免、奇异性预防和工作空间约束。通过在CBF目标中显式考虑任务层级,避免了在安全极限下关节空间与操作空间任务性能下降。我们在仿真与硬件上验证了性能,并开源高性能代码及演示视频,详见项目网页 https://stanfordasl.github.io/oscbf/

原文摘要 · Abstract (English)

Safe real-time control of robotic manipulators in unstructured environments requires handling numerous safety constraints without compromising task performance. Traditional approaches, such as artificial potential fields (APFs), suffer from local minima, oscillations, and limited scalability, while model predictive control (MPC) can be computationally expensive. Control barrier functions (CBFs) offer a promising alternative due to their high level of robustness and low computational cost, but these safety filters must be carefully designed to avoid significant reductions in the overall performance of the manipulator. In this work, we introduce an Operational Space Control Barrier Function (OSCBF) framework that integrates safety constraints while preserving task-consistent behavior. Our approach scales to hundreds of simultaneous constraints while retaining real-time control rates, ensuring collision avoidance, singularity prevention, and workspace containment even in highly cluttered settings or during dynamic motions. By explicitly accounting for the task hierarchy in the CBF objective, we prevent degraded performance across both joint-space and operational-space tasks, when at the limit of safety. We validate performance in both simulation and hardware, and release our open-source high-performance code and media on our project webpage, https://stanfordasl.github.io/oscbf/

机器人控制安全约束屏障函数实时系统

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