Bipedal (two-legged) robots are sophisticated machines, but they are not the most graceful when things go wrong. A simple push, fall or an obstacle can send them crashing to the ground, often resulting in expensive damage to sensitive components such as cameras.

To solve this problem, researchers at Disney Research in Zurich, Switzerland, have developed a new system that ensures that when gravity brings a robot tumbling down, it falls softly and gracefully.

Existing techniques to protect robots when they topple over do not offer control or effectively minimize impact. Actuators might freeze, causing the robot to stiffen and hit the ground hard, or they might go limp, leaving the robot to tumble chaotically. Other methods rely on pre-programmed falling motions, but these only work for slow movements or simple falls.