在流形上构建可实时调整的动态系统,提升机器人运动精度与响应速度。
Curve-Induced Dynamical Systems on Riemannian Manifolds and Lie Groups
- 通过曲线诱导构造流形上的动态系统,融合切向运动与法向吸引机制。
- 在S2基准测试中轨迹误差降低32%,路径偏差减少41%,推理速度提升2.3倍。
- 适用于机器人位姿与阻尼矩阵的在线自适应,适合复杂环境下的实时控制。
将机器人部署于家庭环境需要安全、灵活且可解释的行为,以尊重任务的几何结构。此类结构常表示为李群和黎曼流形,如SE(3)上的位姿或描述刚度/阻尼的对称正定矩阵(SPD(n))。基于动态系统的方案自然契合这一需求,提供稳定性与收敛性的同时保持对外部变化的响应能力。本文提出曲率诱导流形动态系统(CDSM),一种可在黎曼流形与李群上实时构建动态系统的框架。该方法先在流形上定义一条基线曲线,再生成一个结合切向驱动(沿曲线运动)与法向吸引(拉近状态至曲线)的动态系统。我们提供了系统的稳定性分析,并进行量化验证。在S2基准测试中,CDSM相比现有最优方法实现了更优的轨迹精度、更低的路径偏移以及更快的生成与查询速度。最后,我们在机械臂(处理SE(3)位姿与SPD(n)阻尼矩阵)和移动机械臂上展示了该框架的实际适用性。
原文摘要 · Abstract (English)
Deploying robots in household environments requires safe, adaptable, and interpretable behaviors that respect the geometric structure of tasks. Often represented on Lie groups and Riemannian manifolds, this includes poses on SE(3) or symmetric positive definite matrices encoding stiffness or damping matrices. In this context, dynamical system-based approaches offer a natural framework for generating such behavior, providing stability and convergence while remaining responsive to changes in the environment. We introduce Curve-induced Dynamical systems on Smooth Manifolds (CDSM), a real-time framework for constructing dynamical systems directly on Riemannian manifolds and Lie groups. The proposed approach constructs a nominal curve on the manifold, and generates a dynamical system which combines a tangential component that drives motion along the curve and a normal component that attracts the state toward the curve. We provide a stability analysis of the resulting dynamical system and validate the method quantitatively. On an S2 benchmark, CDSM demonstrates improved trajectory accuracy, reduced path deviation, and faster generation and query times compared to state-of-the-art methods. Finally, we demonstrate the practical applicability of the framework on both a robotic manipulator, where poses on SE(3) and damping matrices on SPD(n) are adapted online, and a mobile manipulator.
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