论文标题

基于能量罐的政策,用于与移动物体的强大空中互动

Energy Tank-Based Policies for Robust Aerial Physical Interaction with Moving Objects

论文作者

Brunner, Maximilian, Giacomini, Livio, Siegwart, Roland, Tognon, Marco

论文摘要

尽管在过去的十年中,空中机器人的操纵能力得到了极大的改善,但只有很少的作品解决了与动态环境的空中物理互动问题,提出了强烈的基于模型的方法。但是,在实际情况下,通常不可能以高精度对环境进行建模。在这项工作中,我们旨在为OMAV为可靠的物理互动任务开发一个控制框架,该任务在可能存在不可预见的干扰的情况下与铰接和可移动的对象一起,而不依赖于准确的环境模型。受基于能量控制器在物理交互的应用程序的启发,我们提出了一种基于被动性的阻抗和扳手跟踪控制器,并结合基于动量的扳手估计器。这与能量坦克框架相结合,以确保系统的稳定性,而基于能量和功率的适应性策略则被部署以实现与任何类型的被动环境的安全互动。控制框架提供了稳定性的正式保证,在实践中,考虑到推动未知质量的艰巨任务,在未知的摩擦表面上移动并受到未知的干扰。对于这种情况,我们介绍,评估和讨论三种不同的政策。

Although manipulation capabilities of aerial robots greatly improved in the last decade, only few works addressed the problem of aerial physical interaction with dynamic environments, proposing strongly model-based approaches. However, in real scenarios, modeling the environment with high accuracy is often impossible. In this work we aim at developing a control framework for OMAVs for reliable physical interaction tasks with articulated and movable objects in the presence of possibly unforeseen disturbances, and without relying on an accurate model of the environment. Inspired by previous applications of energy-based controllers for physical interaction, we propose a passivity-based impedance and wrench tracking controller in combination with a momentum-based wrench estimator. This is combined with an energy-tank framework to guarantee the stability of the system, while energy and power flow-based adaptation policies are deployed to enable safe interaction with any type of passive environment. The control framework provides formal guarantees of stability, which is validated in practice considering the challenging task of pushing a cart of unknown mass, moving on a surface of unknown friction, as well as subjected to unknown disturbances. For this scenario, we present, evaluate and discuss three different policies.

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