Acrobots Apr 2026

The robot must learn to oscillate back and forth, increasing its arc until it has enough speed to reach the top.

Whether it's a digital model in a physics simulator or a physical machine in a robotics lab, the Acrobot continues to be a vital tool for teaching machines how to move with the grace and intelligence of a human performer. Dynamics Showing Perfection in Acrobats- Robots by Boston Acrobots

Unlike a standard robotic arm where every joint has its own motor, the Acrobot has only one powered joint. It consists of two links and two joints: The robot must learn to oscillate back and

This joint is unpowered (passive). It hangs freely from a fixed pivot point, much like a gymnast's hands on a bar. It consists of two links and two joints:

Once at the peak, the Acrobot must perform a "handstand" on its passive joint. This requires constant, minute adjustments at the elbow to maintain a precarious equilibrium. Why Do We Build Them?

Because the first joint has no motor, the robot is . It cannot simply "lift" itself; it must use precisely timed "kicks" at the elbow to build up energy, eventually swinging into an inverted vertical position—a feat known as the "swing-up" task. The Challenge of Control