フィードバック変調による四足歩行の調和ポリシー
Feedback-Modulated Harmonic Policies for Quadruped Locomotion
各関節軌道をコマンド条件付きフーリエ級数で表現し、フィードバックでオンライン修正する四足歩行制御を提案。シミュレーションとUnitree Go2実機で高速歩行と積載を実証。
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著者: Yixuan Jia, Steven Roche, Jonathan P. How
分類: cs.RO
原文アブストラクト
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.