Feedback-Modulated Harmonic Policies for Quadruped Locomotion

2026-09-15

AI Summary

研究通过使用基于反馈调节的傅里叶级数表示关节轨迹的方法，改进了四足机器人运动策略，提高了速度和负载能力。

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.

Problem

• quadruped locomotion
• joint-level actions
• periodic structure
• Fourier series
• feedback

Innovation

• command-conditioned Fourier series
• feedback modulation
• harmonic policies
• dynamic mode decomposition