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arXiv 2103.11178cs.RO
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四旋翼机抗外力安全运动规划

External Forces Resilient Safe Motion Planning for Quadrotor

Zhejiang University(浙江大学);University of Pennsylvania(宾夕法尼亚大学);Huzhou Institute of Zhejiang University(浙江大学湖州研究院)

Yuwei Wu, Ziming Ding, Chao Xu, Fei Gao

摘要:

对于复杂未知环境中的四旋翼飞行器,在不需要外界干扰先验知识的情况下进行自适应自主导航具有重要意义。考虑外部干扰的主流方法是实现干扰抑制控制和路径跟踪。然而,鲁棒控制,以补偿跟踪偏差没有很好地考虑到能源消耗,甚至参考路径将成为危险和棘手的干扰。随着最近外力估计的发展,可以结合实时力估计器来开发更强大和安全的规划框架。本文提出了一个系统的(重新)规划框架,可以弹性地产生安全的轨迹在动荡的条件下。首先,前端Kinodynamic路径搜索力偏置运动基元。然后,我们开发了一个非线性模型预测控制(NMPC)作为一个本地规划器与哈密尔顿-雅可比(HJ)前向可达性分析的误差动态外力。它保证避免碰撞的约束椭球的四旋翼机构扩展的前向可达集(FRS)内的安全凸多面体。我们的方法在模拟和现实世界的实验与不同的外力来源进行了验证。

英文摘要:

Adaptive autonomous navigation with no prior knowledge of extraneous disturbance is of great significance for quadrotors in a complex and unknown environment. The mainstream that considers external disturbance is to implement disturbance-rejected control and path tracking. However, the robust control to compensate for tracking deviations is not well-considered regarding energy consumption, and even the reference path will become risky and intractable with disturbance. As recent external forces estimation advances, it is possible to incorporate a real-time force estimator to develop more robust and safe planning frameworks. This paper proposes a systematic (re)planning framework that can resiliently generate safe trajectories under volatile conditions. Firstly, a front-end kinodynamic path is searched with force-biased motion primitives. Then we develop a nonlinear model predictive control (NMPC) as a local planner with Hamilton-Jacobi (HJ) forward reachability analysis for error dynamics caused by external forces. It guarantees collision avoidance by constraining the ellipsoid of the quadrotor body expanded with the forward reachable sets (FRSs) within safe convex polytopes. Our method is validated in simulations and real-world experiments with different sources of external forces.

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。

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