ArXiv

Evaluation of an Actuated Spine in Agile Quadruped Locomotion

2026-05-08 · 16:45 UTC ·Nico Bohlinger, Piotr Kicki, Davide Tateo... ·1 min read
Authors
Nico Bohlinger, Piotr Kicki, Davide Tateo...
Categories
cs.RO
arXiv
https://arxiv.org/abs/2605.07988v1
PDF
https://arxiv.org/pdf/2605.07988v1

Brief

The paper investigates whether a single-DOF actuated sagittal spine improves learned agile locomotion for a quadruped. Using MuJoCo simulations of the Silver Badger robot, the authors evaluate high-speed running, stair and high-angle slope climbing, hurdling, and crawling. Results show the spine increases agility and enables traversing higher stairs, steeper slopes, taller obstacles, and narrower passages, suggesting spine actuation is a promising design extension for agile robots.

Why it matters

Bohlinger et al. (arXiv 2026-05-08) evaluate an actuated 1-DOF spine in the sagittal plane on MAB Robotics' Silver Badger in MuJoCo, finding that the spine provides increased agility and enables the robot to overcome higher stairs, steeper slopes, taller hurdles, and smaller passages versus the non-spined configuration.

Key details

  • The empirical simulation study covers multiple tasks—high-speed running, stair climbing, high-angle slope climbing, hurdling, and crawling—demonstrating consistent performance gains from adding a single-DOF spinal actuator for learned agile quadruped locomotion.
Source evidence

Abstract

The spine plays a crucial role in the dynamic locomotion of quadrupedal animals, improving the stability, speed, and efficiency of their gait, especially for fast-paced and highly agile movements. Therefore, the spine is also a promising and natural way to extend the capabilities of quadruped robots. This paper empirically investigates the benefits of an actuated spine for learning agile quadruped locomotion. We evaluate whether the use of the spine brings benefits in terms of high-speed running, climbing stairs, climbing high-angle slopes, hurdling, and crawling scenarios. We conducted an empirical study in MuJoCo simulation using the Silver Badger robot from MAB Robotics with an actuated 1-DOF spine in the sagittal plane. The obtained results show that the use of the spine provides the robot with increased agility and allows it to overcome higher stairs, steeper slopes, higher obstacles, and smaller passages.