New robot locomotion method for microgravity uses grasp-based dynamic movement

A new paper from researchers at the University of Illinois Urbana-Champaign introduces a framework for designing dynamic locomotion in microgravity using multi-limbed robots that grasp irregularly spaced anchors. Unlike traditional walking or hopping, which rely on continuous contact with a surface, this approach treats each limb as an independent manipulator that can establish temporary holds on any available anchor point. The authors—Chaerim Moon, Joohyung Kim, and Justin K. Yim—developed a parameterizable planning framework that lets engineers explore how gait pattern, stride length, locomotion speed, and nominal posture affect performance.

The key insight is that dynamic locomotion in microgravity must balance both kinematic and dynamic constraints simultaneously. The team tested their framework in simulation using two distinct quadruped robot morphologies. Results show that maximizing the feasible contact wrench space (the set of forces and torques each limb can generate at an anchor) while minimizing impulsive whole-body dynamics significantly improves stability and reduces the actuation power required. This suggests that future space robots—for repairing satellites, exploring asteroid surfaces, or moving inside spacecraft—could use these design principles to achieve fast, reliable movement without needing specialized rails or surfaces.