arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2303.13630cs.ROmath.OC
收藏

基于控制屏障函数的协作式足式运动安全关键协调方法

Safety-Critical Coordination for Cooperative Legged Locomotion via Control Barrier Functions

California Institute of Technology(加州理工学院)

Jeeseop Kim, Jaemin Lee, Aaron D. Ames

AI总结:

针对存在固定约束的协作足式机器人运动协调问题,提出基于控制屏障函数的三层安全关键控制架构,经仿真与四足机器人实验验证可保障安全协作与轨迹跟踪。

摘要:

本文提出了一种安全关键方法,用于在存在固定(完整)约束的情况下对协作机器人的运动进行协调控制。为此,我们利用控制屏障函数(control barrier functions, CBFs)确保机器人安全协作,同时维持期望队形并规避障碍物。顶层规划器生成一组可行轨迹,同时考虑机器人之间的运动学约束与环境物理约束,该规划器借助CBFs实现安全关键协调控制,即保障协作机器人运动过程中的安全性。中层轨迹规划器结合互连的单刚体(single rigid body, SRB)动力学,生成最优地面反作用力(ground reaction forces, GRFs),以跟踪顶层规划器输出的安全保障轨迹,同时处理智能体间的互连动力学。分布式底层控制器生成全身运动以跟踪指定的最优GRFs,同时确保各支撑腿末端满足摩擦锥条件。通过数值仿真以及在两台四足机器人上的实验,验证了该方法的有效性。

英文摘要:

This paper presents a safety-critical approach to the coordinated control of cooperative robots locomoting in the presence of fixed (holonomic) constraints. To this end, we leverage control barrier functions (CBFs) to ensure the safe cooperation of the robots while maintaining a desired formation and avoiding obstacles. The top-level planner generates a set of feasible trajectories, accounting for both kinematic constraints between the robots and physical constraints of the environment. This planner leverages CBFs to ensure safety-critical coordination control, i.e., guarantee safety of the collaborative robots during locomotion. The middle-level trajectory planner incorporates interconnected single rigid body (SRB) dynamics to generate optimal ground reaction forces (GRFs) to track the safety-ensured trajectories from the top-level planner while addressing the interconnection dynamics between agents. Distributed low-level controllers generate whole-body motion to follow the prescribed optimal GRFs while ensuring the friction cone condition at each end of the stance legs. The effectiveness of the approach is demonstrated through numerical simulations and experimentally on a pair of quadrupedal robots.

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。

↑