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arXiv 2103.14830cs.ROcs.SYeess.SY
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最小有向信息:柔顺机器人的设计原则

Minimum directed information: A design principle for compliant robots

Fraunhofer Institut für Produktionsanlagen und Konstruktionstechnik (IPK)(弗劳恩霍夫生产设备和设计技术研究所)

Kevin Haninger

摘要:

机器人的动力学--特别是顺从的程度和位置--可以显著影响性能和控制复杂性。被动动力学可以设计为具有良好的吸引区域或特定任务的极限环,但在一系列任务上实现灵活性需要控制的协同设计。本文从信息的角度出发:机器人动力学应该减少控制器在一系列任务中实现性能阈值所需的信息量。针对这一目标,提出了一种迭代法来最小化离散非线性系统从状态到控制的有向信息。iLQG用于找到控制器和信息值,然后优化动力学的设计参数(例如末端执行器或关节的刚度)以减少有向信息,同时保持性能的最小界限。该方法在仿真中得到了验证,在一个两个质量系统与一个不确定的墙壁位置和一个高自由度的开门任务接触,并显示出提高噪声鲁棒性和减少控制增益的时间方差。

英文摘要:

A robot's dynamics -- especially the degree and location of compliance -- can significantly affect performance and control complexity. Passive dynamics can be designed with good regions of attraction or limit cycles for a specific task, but achieving flexibility on a range of tasks requires co-design of control. This paper takes an information perspective: the robot dynamics should reduce the amount of information required for a controller to achieve a threshold of performance in a range of tasks. Towards this goal, an iterative method is proposed to minimize the directed information from state to control on discrete-time nonlinear systems. iLQG is used to find a controller and value of information, then the design parameters of the dynamics (e.g. stiffness of end-effector or joint) are optimized to reduce directed information while maintaining a minimum bound on performance. The approach is validated in simulation, on a two-mass system in contact with an uncertain wall position and a high-DOF door opening task, and shown to improve noise robustness and reduce time variance of control gains.

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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