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arXiv 2011.04684cs.ROcs.SYeess.SY
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基于风险敏感最优控制的不确定接触相互作用阻抗优化

Impedance Optimization for Uncertain Contact Interactions Through Risk Sensitive Optimal Control

Tandon School of Engineering, New York University(纽约大学坦登工程学院);Max Planck Institute for Intelligent Systems(马克斯·普朗克智能系统研究所)

Bilal Hammoud, Majid Khadiv, Ludovic Righetti

摘要:

本文讨论的问题,计算最佳阻抗的腿运动任务涉及复杂的接触相互作用的时间表。我们制定的问题阻抗调节作为干扰抑制和测量不确定性之间的权衡。我们扩展了随机最优控制算法称为风险敏感控制,考虑到测量的不确定性,并提出了一个正式的方法,包括未知的接触位置的不确定性。该方法可以有效地生成最优状态和控制轨迹以及局部反馈控制增益,即阻抗时间表。大量的模拟表明,该方法在产生有意义的刚度和阻尼调制模式之前和之后的接触相互作用的能力。例如,接触力在早期接触期间减小,阻尼增加以预期高冲击事件,并且跟踪自动地权衡以增加稳定性。特别是,我们表现出一个显着的性能改善,在跳跃和小跑任务与模拟四足机器人。

英文摘要:

This paper addresses the problem of computing optimal impedance schedules for legged locomotion tasks involving complex contact interactions. We formulate the problem of impedance regulation as a trade-off between disturbance rejection and measurement uncertainty. We extend a stochastic optimal control algorithm known as Risk Sensitive Control to take into account measurement uncertainty and propose a formal way to include such uncertainty for unknown contact locations. The approach can efficiently generate optimal state and control trajectories along with local feedback control gains, i.e. impedance schedules. Extensive simulations demonstrate the capabilities of the approach in generating meaningful stiffness and damping modulation patterns before and after contact interaction. For example, contact forces are reduced during early contacts, damping increases to anticipate a high impact event and tracking is automatically traded-off for increased stability. In particular, we show a significant improvement in performance during jumping and trotting tasks with a simulated quadruped robot.

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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