arXiv:2502.13286cs.RO2025-02被引 6

提出基于凸集的机器人轨迹规划方法,实时避障且满足机械臂运动约束。

BoundPlanner: A convex-set-based approach to bounded manipulator trajectory planning

  • 用凸集表示无碰撞空间,生成带边界的参考路径
  • 在7自由度机械臂上实现快速在线规划,优于现有方法
  • 适用于复杂场景下需严格遵守机械臂限制的工业应用

在线轨迹规划使机械臂能快速响应环境或任务变化。尽管已有多种针对已知环境的轨迹规划方法,但多数难以满足在线计算需求。现有在线规划方法在复杂场景中常无法找到符合机械臂极限并规避碰撞的可行轨迹。本文提出一种包含新型基于凸集的笛卡尔路径规划器BoundPlanner和在线轨迹规划器BoundMPC的规划框架。BoundPlanner利用凸集探索并映射无碰撞空间,生成带有边界的参考路径;BoundMPC被扩展以处理凸集形式的路径偏差,使机械臂能在约束范围内最优跟踪路径,同时考虑运动学特性。通过一种与障碍物数量无关的新型凸集碰撞避免公式,考虑了机械臂运动链的碰撞。在7-DoF机械臂上的仿真与实验表明,该方法性能优于当前先进方法。源代码可在github.com/TU-Wien-ACIN-CDS/BoundPlanner获取,实验视频见www.acin.tuwien.ac.at/42d4。

原文摘要 · Abstract (English)

Online trajectory planning enables robot manipulators to react quickly to changing environments or tasks. Many robot trajectory planners exist for known environments but are often too slow for online computations. Current methods in online trajectory planning do not find suitable trajectories in challenging scenarios that respect the limits of the robot and account for collisions. This work proposes a trajectory planning framework consisting of the novel Cartesian path planner based on convex sets, called BoundPlanner, and the online trajectory planner BoundMPC. BoundPlanner explores and maps the collision-free space using convex sets to compute a reference path with bounds. BoundMPC is extended in this work to handle convex sets for path deviations, which allows the robot to optimally follow the path within the bounds while accounting for the robot's kinematics. Collisions of the robot's kinematic chain are considered by a novel convex-set-based collision avoidance formulation independent on the number of obstacles. Simulations and experiments with a 7-DoF manipulator show the performance of the proposed planner compared to state-of-the-art methods. The source code is available at github.com/TU-Wien-ACIN-CDS/BoundPlanner and videos of the experiments can be found at www.acin.tuwien.ac.at/42d4.

轨迹规划凸集机械臂在线控制

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