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arXiv 2311.01720cs.RO
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学习降阶软体机器人控制器

Learning Reduced-Order Soft Robot Controller

LightSpeed Studios, Tencent(腾讯光子工作室群);Department of Computer Science, Zhejiang University(浙江大学计算机科学与技术学院)

Chen Liang, Xifeng Gao, Kui Wu, Zherong Pan

AI总结:

针对软体机器人高维建模与控制难题,提出两阶段降阶方法识别仿真空间和任务相关控制空间,并用多保真度 Riemannian 贝叶斯双层优化实现维度低于10的低维 MPC 控制。

摘要:

可变形机器人因其高维构型空间而众所周知地难以建模或控制。直接轨迹优化会遭遇维数灾难并产生高昂的计算成本,而基于学习的控制器优化方法又对超参数调节十分敏感。为克服这些局限,我们假设高保真软体机器人可以通过限制在低维空间中而同时得到仿真和控制。在该假设下,我们提出一种两阶段算法来识别此类仿真空间与控制空间。该方法首先识别所谓的仿真空间,该空间捕捉显著变形模式,并将机器人的控制方程限制于其中;随后识别控制空间,并将控制信号限制于其中。我们提出一种多保真度 Riemannian 贝叶斯双层优化方法,用于识别特定任务的控制空间。结果表明,对于高自由度软体机器人完成行走和游动任务,控制空间维度可以低于10,从而使低维 MPC 控制器能够以可处理的计算复杂度应用于软体机器人。

英文摘要:

Deformable robots are notoriously difficult to model or control due to its high-dimensional configuration spaces. Direct trajectory optimization suffers from the curse-of-dimensionality and incurs a high computational cost, while learning-based controller optimization methods are sensitive to hyper-parameter tuning. To overcome these limitations, we hypothesize that high fidelity soft robots can be both simulated and controlled by restricting to low-dimensional spaces. Under such assumption, we propose a two-stage algorithm to identify such simulation- and control-spaces. Our method first identifies the so-called simulation-space that captures the salient deformation modes, to which the robot's governing equation is restricted. We then identify the control-space, to which control signals are restricted. We propose a multi-fidelity Riemannian Bayesian bilevel optimization to identify task-specific control spaces. We show that the dimension of control-space can be less than $10$ for a high-DOF soft robot to accomplish walking and swimming tasks, allowing low-dimensional MPC controllers to be applied to soft robots with tractable computational complexity.

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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