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arXiv 2602.14092eess.SYcs.ROcs.SY
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在软机器人系统中同时进行状态估计和在线模型学习

Simultaneous State Estimation and Online Model Learning in a Soft Robotic System

Department of Information Technology, Uppsala University(信息科技系,乌普萨拉大学);Vascular Surgery, Hannover Medical School(血管外科,汉诺威医学院)

Jan-Hendrik Ewering, Max Bartholdt, Simon F. G. Ehlers, Niklas Wahlström, Thomas B. Schön, Thomas Seel

AI总结:

本文提出一种方法,利用灰盒系统识别工具,在线学习软机器人的弯曲刚度模型并准确估计其姿态。

摘要:

操作复杂的真实世界系统,如软机器人,可以受益于需要准确状态和模型知识的精确预测控制方案。这种知识通常在实际环境中不可用,必须从噪声测量中推断。特别是,同时估计未知状态和在线学习模型具有挑战性。本文展示了一种最近提出的灰盒系统识别工具如何使软机器人当前姿态估计和弯曲刚度模型学习同时进行。对于估计和学习,只需一个名义上的恒定曲率机器人模型和机器人基座反应(如基座力)的测量。估计方案依赖于边际化的粒子滤波器,使我们能够方便地将名义上的恒定曲率方程与学习的高斯过程(GP)弯曲刚度模型对接。这与通过随机行走在刚度值上进行估计形成对比,使弯曲刚度预测成为可能,并提高整体模型质量。我们使用实际的软机器人证明了该方法能够在线学习弯曲刚度模型并准确估计机器人姿态。值得注意的是,多步前向预测中的误差减少表明,学习的弯曲刚度GP提高了整体模型质量。

英文摘要:

Operating complex real-world systems, such as soft robots, can benefit from precise predictive control schemes that require accurate state and model knowledge. This knowledge is typically not available in practical settings and must be inferred from noisy measurements. In particular, it is challenging to simultaneously estimate unknown states and learn a model online from sequentially arriving measurements. In this paper, we show how a recently proposed gray-box system identification tool enables the estimation of a soft robot's current pose while at the same time learning a bending stiffness model. For estimation and learning, we only need a nominal constant-curvature robot model and measurements of the robot's base reactions (e.g., base forces). The estimation scheme -- relying on a marginalized particle filter -- allows us to conveniently interface nominal constant-curvature equations with a Gaussian Process (GP) bending stiffness model to be learned. This, in contrast to estimation via a random walk over stiffness values, enables prediction of bending stiffness and improves overall model quality. We demonstrate, using a real-world soft robot, that the method learns a bending-stiffness model online while accurately estimating the robot's pose. Notably, reduced error in multi-step forward predictions indicates that the learned bending-stiffness GP improves overall model quality.

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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