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论文arXiv 2609.179461 个月前

反馈调制谐波策略实现Go2四足3.67m/s高速运动 ​

本文由 AI 根据公开内容整理,可能有误,请以原文为准:Feedback-Modulated Harmonic Policies for Quadruped Locomotion(arXiv 2609.17946)

核心内容 ​

针对四足机器人运动策略中周期结构隐式学习的问题,该研究提出一种反馈调制谐波策略(Feedback-Modulated Harmonic Policies)。该方法将关节轨迹建模为指令条件傅里叶级数,并通过上下文网络生成系数与反馈权重,在执行阶段实时调整关节偏移、谐波增益、频率及相位。相比直接输出关节目标的MLP策略,该架构显式引入了运动的频率结构先验。

仿真分析表明,MLP策略的隐藏层激活经动态模态分解后,仍呈现出接近足部高度振荡频率及其二次谐波的周期性模式,证实了隐式周期结构的存在。在Unitree Go2实机部署中,该谐波控制器实现了3.67m/s的板载估算峰值速度,并在独立测试中成功承载5.883kg额外负载,验证了算法在高速动态运动与负载扰动下的鲁棒性。

关键看点 ​

  • 谐波策略架构:采用指令条件傅里叶级数表征关节轨迹,通过上下文网络动态调节频率、相位及谐波增益等参数
  • 隐式周期验证:对MLP策略进行动态模态分解,发现其激活模式包含足部振荡基频与二次谐波分量
  • Go2实机性能:在Unitree Go2上实现3.67m/s板载估算峰值速度,并在单独试验中稳定承载5.883kg负载

工程与产业观察 ​

该工作证明了在强化学习策略中注入显式物理先验(如傅里叶谐波结构)可有效提升四足机器人的高速运动上限与负载能力。对于具身智能算法工程师而言,这种结合信号处理与控制理论的混合表征方法,为解决纯端到端策略在极端工况下泛化性不足提供了可复现的工程范式。

英文摘要 (Abstract) ​

Learned quadruped locomotion policies commonly map observations directly to joint-level actions, leaving the periodic structure of locomotion implicit in the policy. We investigate an alternative representation in which each joint trajectory is expressed as a command-conditioned Fourier series and modified online using feedback from the robot state. A context network generates the Fourier coefficients and the weights of a per-step feedback network, whose outputs adjust joint offsets, harmonic gains, frequency, and phase during execution. In simulation, we examine this explicit frequency structure alongside the hidden activations of an MLP policy that directly outputs joint targets. The harmonic waveforms change frequency and shape with commanded speed. Dynamic mode decomposition of selected MLP rollouts reveals dominant activation modes near the foot-height oscillation frequency and its second harmonic, showing periodic structure without an explicit Fourier generator. On a Unitree Go2, the simulation-trained harmonic controller records a provisional onboard-estimated peak speed of 3.67 meter per second and carries added loads up to 5.883 kilogram in separate trials.

作者:Yixuan Jia, Steven Roche, Jonathan P. How

来源

本页事实对应的公开页面,以原文为准。

  1. arXiv 2609.17946:Feedback-Modulated Harmonic Policies for Quadruped Locomotion访问 2026-10-12