提出新型自适应滑模控制,让微型无人机更稳更快地完成高难度飞行。
Robust and Agile Quadrotor Flight via Adaptive Unwinding-Free Quaternion Sliding Mode Control
- 基于四元数设计无缠绕滑模控制,解决传统方法收敛慢、不稳定问题
- 硬件实测达250Hz位置控制、500Hz姿态控制,32克无人机实现3g加速度
- 适合资源受限的微型无人机,尤其在强干扰下仍保持高精度飞行
本文提出一种新型自适应滑模控制框架,用于多旋翼无人机在严苛计算约束下的鲁棒与敏捷飞行。该控制器克服了以往滑模控制方法的多项缺陷:(i) SO(3)方法收敛慢且几乎全局稳定,(ii) 欧拉角控制器过度简化旋转动力学,(iii) 四元数方法存在缠绕现象,(iv) 自适应滑模中增益过增长问题。通过非光滑稳定性分析,我们为定义在S³上的非光滑姿态滑模动态和位置滑模动态提供了严格的全局稳定性证明。控制器计算高效,在资源受限的纳米级四轴飞行器上稳定运行,位置控制刷新率达250 Hz,姿态控制达500 Hz。在超过130次硬件实验中,其轨迹跟踪精度和鲁棒性显著优于三种基准方法,且控制能耗较低。该控制器可实现动态投掷起飞、翻滚机动及超过3g的加速度,对仅32克的微型无人机而言尤为突出。结果表明,该方法在需应对强外部扰动和严苛计算约束的实际场景中具有广阔应用前景。
原文摘要 · Abstract (English)
This paper presents a new adaptive sliding mode control (SMC) framework for quadrotors that achieves robust and agile flight under tight computational constraints. The proposed controller addresses key limitations of prior SMC formulations, including (i) the slow convergence and almost-global stability of $\mathrm{SO(3)}$-based methods, (ii) the oversimplification of rotational dynamics in Euler-based controllers, (iii) the unwinding phenomenon in quaternion-based formulations, and (iv) the gain overgrowth problem in adaptive SMC schemes. Leveraging nonsmooth stability analysis, we provide rigorous global stability proofs for both the nonsmooth attitude sliding dynamics defined on $\mathbb{S}^3$ and the position sliding dynamics. Our controller is computationally efficient and runs reliably on a resource-constrained nano quadrotor, achieving 250 Hz and 500 Hz refresh rates for position and attitude control, respectively. In an extensive set of hardware experiments with over 130 flight trials, the proposed controller consistently outperforms three benchmark methods, demonstrating superior trajectory tracking accuracy and robustness with relatively low control effort. The controller enables aggressive maneuvers such as dynamic throw launches, flip maneuvers, and accelerations exceeding 3g, which is remarkable for a 32-gram nano quadrotor. These results highlight promising potential for real-world applications, particularly in scenarios requiring robust, high-performance flight control under significant external disturbances and tight computational constraints.
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