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arXiv 1407.2896cs.RO
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基于渐近最优采样的Kinodynamic规划

Asymptotically Optimal Sampling-based Kinodynamic Planning

Yanbo Li, Zakary Littlefield, Kostas E. Bekris

摘要:

基于采样的算法被视为高维运动规划的实用解决方案。最近的进展已经利用随机几何图论来展示如何用这些方法也可以实现渐近最优性。实现这一理想的属性的动态系统需要解决一个两点边值问题(BVP)的基础动力系统的状态空间。这是困难的,但是,如果不是不切实际的,生成一个边界元法求解器的各种重要的动态模型的机器人或物理模拟的。因此,一个开放的挑战是,当规划系统而不访问BVP求解器时,是否有可能实现最优性保证。这项工作解决了上述问题,并介绍了如何实现渐进最优的Kinodynamic规划增量采样为基础的规划器,通过引入一个新的严格的框架。两种新的方法,稳定稀疏RRT(SST)和SST*,结果从这个分析,这是渐近接近最优和最优的,分别。该技术被证明是快速收敛到高质量的路径,而他们只保持一个稀疏的样本集,这使得他们的计算效率。使用动态系统基准的实验结果,以及物理模拟机器人的规划者的良好性能得到证实。

英文摘要:

Sampling-based algorithms are viewed as practical solutions for high-dimensional motion planning. Recent progress has taken advantage of random geometric graph theory to show how asymptotic optimality can also be achieved with these methods. Achieving this desirable property for systems with dynamics requires solving a two-point boundary value problem (BVP) in the state space of the underlying dynamical system. It is difficult, however, if not impractical, to generate a BVP solver for a variety of important dynamical models of robots or physically simulated ones. Thus, an open challenge was whether it was even possible to achieve optimality guarantees when planning for systems without access to a BVP solver. This work resolves the above question and describes how to achieve asymptotic optimality for kinodynamic planning using incremental sampling-based planners by introducing a new rigorous framework. Two new methods, Stable Sparse-RRT (SST) and SST*, result from this analysis, which are asymptotically near-optimal and optimal, respectively. The techniques are shown to converge fast to high-quality paths, while they maintain only a sparse set of samples, which makes them computationally efficient. The good performance of the planners is confirmed by experimental results using dynamical systems benchmarks, as well as physically simulated robots.

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