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arXiv 2107.01259cs.ROcs.SYeess.SY
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通过减少重复性来加速Kinodynamic RRT *

Accelerating Kinodynamic RRT* Through Dimensionality Reduction

Georgia Institute of Technology(佐治亚理工学院)

Dongliang Zheng, Panagiotis Tsiotras

摘要:

基于采样的运动规划算法(如RRT*)因其快速找到初始解然后渐近收敛到最优解的能力而众所周知。然而,对于高维规划问题,特别是对于采样空间不仅是配置空间而且是完整状态空间的动态系统,收敛速度可能很慢。在本文中,我们介绍了使用部分最终状态自由(PFF)的最优控制器的Kinodynamic RRT* [1],以减少采样空间的维数的想法。建议的加速Kinodynamic RRT*,称为Kino-RRT*,而不是对整个状态空间进行采样,只对状态空间的一部分进行采样,而其余的状态由PFF最优控制器选择。我们还提出了一个延迟和间歇更新的RRT* 树中的所有边缘的最佳到达时间,以降低算法的计算复杂度。我们使用4-D和10-D状态空间线性系统测试了所提出的算法,并表明Kino-RRT* 比Kinodynamic RRT* 算法收敛得更快。

英文摘要:

Sampling-based motion planning algorithms such as RRT* are well-known for their ability to quickly find an initial solution and then converge to the optimal solution asymptotically. However, the convergence rate can be slow for highdimensional planning problems, particularly for dynamical systems where the sampling space is not just the configuration space but the full state space. In this paper, we introduce the idea of using a partial-final-state-free (PFF) optimal controller in kinodynamic RRT* [1] to reduce the dimensionality of the sampling space. Instead of sampling the full state space, the proposed accelerated kinodynamic RRT*, called Kino-RRT*, only samples part of the state space, while the rest of the states are selected by the PFF optimal controller. We also propose a delayed and intermittent update of the optimal arrival time of all the edges in the RRT* tree to decrease the computation complexity of the algorithm. We tested the proposed algorithm using 4-D and 10-D state-space linear systems and showed that Kino-RRT* converges much faster than the kinodynamic RRT* algorithm.

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