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arXiv 2303.02574cs.ROphysics.app-ph
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用于可变形线性物体基于物理的机器人部署的 Sim2Real 神经控制器

Sim2Real Neural Controllers for Physics-based Robotic Deployment of Deformable Linear Objects

University of California, Los Angeles(加利福尼亚大学洛杉矶分校);NVIDIA Corporation(英伟达公司);Southeast University(东南大学)

Dezhong Tong, Andrew Choi, Longhui Qin, Weicheng Huang, Jungseock Joo, M. Khalid Jawed

AI总结:

本文提出融合机器学习、尺度分析与物理仿真的 Sim2Real 神经控制器,利用三个无量纲参数实现弹性杆在刚性基底上的鲁棒高效图案化部署,并验证于手写、布线和打结任务。

摘要:

可变形线性物体(DLO),例如杆、缆线和绳索,在日常生活中发挥着重要作用。然而,DLO 的操控具有挑战性,因为在操控过程中可能发生较大的几何非线性变形。由于不同的变形模式(例如拉伸、弯曲和扭转)可能在操控过程中导致弹性不稳定性,这一问题变得更加困难。本文中,我们构建了一种物理引导的数据驱动方法,以解决一项具有挑战性的操控任务——将 DLO(弹性杆)按照各种规定图案准确部署到刚性基底上。我们的框架结合机器学习、尺度分析和物理仿真,开发用于部署的基于物理的神经控制器。我们探究被操控 DLO 的重力能与弹性能之间复杂的相互作用,并获得一种对摩擦和材料属性具有鲁棒性的 DLO 部署控制方法。在杆和基底的众多几何与材料属性中,我们通过物理分析表明,只需三个无量纲参数即可描述部署过程。因此,该操控任务控制规律的本质可以用低维模型构建,从而大幅提高计算速度。我们通过一项全面的机器人案例研究,针对多种多样的图案比较用于杆部署的启发式控制方法,展示了最优控制方案的有效性。除此之外,我们还通过让机器人完成模仿人类手写、缆线布置和打结等具有挑战性的高层任务,展示了该控制方案的实用性。

英文摘要:

Deformable linear objects (DLOs), such as rods, cables, and ropes, play important roles in daily life. However, manipulation of DLOs is challenging as large geometrically nonlinear deformations may occur during the manipulation process. This problem is made even more difficult as the different deformation modes (e.g., stretching, bending, and twisting) may result in elastic instabilities during manipulation. In this paper, we formulate a physics-guided data-driven method to solve a challenging manipulation task -- accurately deploying a DLO (an elastic rod) onto a rigid substrate along various prescribed patterns. Our framework combines machine learning, scaling analysis, and physical simulations to develop a physics-based neural controller for deployment. We explore the complex interplay between the gravitational and elastic energies of the manipulated DLO and obtain a control method for DLO deployment that is robust against friction and material properties. Out of the numerous geometrical and material properties of the rod and substrate, we show that only three non-dimensional parameters are needed to describe the deployment process with physical analysis. Therefore, the essence of the controlling law for the manipulation task can be constructed with a low-dimensional model, drastically increasing the computation speed. The effectiveness of our optimal control scheme is shown through a comprehensive robotic case study comparing against a heuristic control method for deploying rods for a wide variety of patterns. In addition to this, we also showcase the practicality of our control scheme by having a robot accomplish challenging high-level tasks such as mimicking human handwriting, cable placement, and tying knots.

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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