arXiv:2410.01038cs.ROcs.SY2024-10被引 10

用自适应控制与可达性分析,让无人船在扰动下仍能安全自主航行。

Safe Autonomy for Uncrewed Surface Vehicles Using Adaptive Control and Reachability Analysis

  • 采用模型参考自适应控制器稳定航迹,实时应对扰动。
  • 相比传统PID,位置误差降低45%至81%,实测验证有效。
  • 结合移动时域估计算法,实现动态安全认证,适合海洋任务场景。

海上机器人在执行海洋监测等任务时,需在遭遇不可预测扰动的情况下保持精确控制并确保安全。无人水面艇(USV)的算法设计必须考虑这些扰动以实现控制与避障。尽管自适应控制已解决部分控制问题,但实际应用受限,且在突发扰动下的安全性难以认证。为此,本文采用模型参考自适应控制器(MRAC)使USV沿期望轨迹稳定运行,并构建基于移动时域估计器(MHE)的可达性模块,实时估计扰动并传播至前向可达集,预测未来状态,实现在线安全认证。我们在麻省理工学院附近的查尔斯河对Clearpath Heron USV进行了测试。实验表明,该系统可有效应对推进器故障和阻力变化等扰动,相比传统PID控制器,位置均方根误差降低45%–81%。此外,可达性模块实现了实时安全认证。我们还在动态补给和运河场景中进一步验证了该系统的有效性,模拟了相关海事任务。

原文摘要 · Abstract (English)

Marine robots must maintain precise control and ensure safety during tasks like ocean monitoring, even when encountering unpredictable disturbances that affect performance. Designing algorithms for uncrewed surface vehicles (USVs) requires accounting for these disturbances to control the vehicle and ensure it avoids obstacles. While adaptive control has addressed USV control challenges, real-world applications are limited, and certifying USV safety amidst unexpected disturbances remains difficult. To tackle control issues, we employ a model reference adaptive controller (MRAC) to stabilize the USV along a desired trajectory. For safety certification, we developed a reachability module with a moving horizon estimator (MHE) to estimate disturbances affecting the USV. This estimate is propagated through a forward reachable set calculation, predicting future states and enabling real-time safety certification. We tested our safe autonomy pipeline on a Clearpath Heron USV in the Charles River, near MIT. Our experiments demonstrated that the USV's MRAC controller and reachability module could adapt to disturbances like thruster failures and drag forces. The MRAC controller outperformed a PID baseline, showing a 45%-81% reduction in RMSE position error. Additionally, the reachability module provided real-time safety certification, ensuring the USV's safety. We further validated our pipeline's effectiveness in underway replenishment and canal scenarios, simulating relevant marine tasks.

无人船自适应控制安全认证可达性分析

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