In safety-critical human-robot collaboration, what capability does impedance control mainly provide?

• A. Rigid position tracking
• B. Higher speed
• C. Compliant interaction
• D. Deterministic timing

Answer: (C)

Impedance control tunes how the robot’s motion responds to forces, effectively creating a controllable impedance at the end-effector. In safety-critical human-robot collaboration, the goal is to interact with humans and objects safely, so the robot should yield under contact rather than rigidly resist. By setting stiffness and damping, the robot behaves like a compliant connection, allowing gentle guidance and safe interaction when a human pushes or guides the arm. This compliant interaction is what impedance control provides most directly. Rigid position tracking would require high stiffness and can be unsafe on contact; higher speed depends on actuation and planning rather than impedance behavior; deterministic timing comes from the control architecture and scheduling, not the impedance model itself.