Whole-Body Control on Uneven Terrain

From the ApexX Blog · Autonomous Robotics for the Physical World

Early mobile robots decoupled the problem: a base that moves and an arm that manipulates, each controlled in isolation. On flat floors that works. On slopes, gravel, and stairs it falls apart.

Whole-body control treats the machine as one coupled system. The position of an arm changes the center of mass, which changes traction, which changes what the base can safely do. Ignoring those couplings is how robots tip over.

Our controllers solve for the whole configuration at once, respecting joint limits, contact forces, and stability margins simultaneously. The result is a machine that stays planted while doing useful work, not just while standing still.

This is the difference between a demo on a clean stage and a robot that survives a real worksite for months.