Biped Stabilization by Linear Feedback of the Variable-Height Inverted Pendulum Model

Stéphane Caron (1)

1 IDH - Interactive Digital Humans

The variable-height inverted pendulum (VHIP) model enables a new balancing strategy by height variations of the center of mass, in addition to the well-known ankle strategy. We propose a biped stabilizer based on linear feedback of the VHIP that is simple to implement, coincides with the state-of-the-art for small perturbations and is able to recover from larger perturbations thanks to this new strategy. This solution is based on "best-effort" pole placement of a 4D divergent component of motion for the VHIP under input feasibility and state viability constraints. We complement it with a suitable whole-body admittance control law and test the resulting stabilizer on the HRP-4 humanoid robot.

Domaines: Robotique [cs.RO]

Stéphane Caron. Biped Stabilization by Linear Feedback of the Variable-Height Inverted Pendulum Model. 2020. ⟨hal-02289919v2⟩