The ostrich-like robot has propellers to jump high

A research team from Shandong University developed the ostrich-like bipedal robot KOU-III with supporting propellers to increase mobility, Interesting Engineering reported on January 8. The name KOU comes from the ancient Chinese mythological character Lie Yukou with the ability to ride the wind, according to study co-author Xianwu Zeng.

To enhance force distribution and reduce transmission deflection, the team of experts modified the robot’s knee actuator, replacing the cantilever output mechanism with a bridge design. The transmission, using a cycloid gear box integrated into the thigh, enhances stability and minimizes deformation upon impact.

The robot’s body is made of carbon fiber, which reduces weight, maximizes rotor torque, and allows 160-degree tilting motion. An independent 24V power system powers the actuators and propellers, while a 5V module powers the controller.

The research team performed many experiments to test KOU-III’s ability to stand, walk and jump. In the standing test, the support of the propeller allowed the robot to effectively resist external disturbances, maintain its posture with minimal tilt angle fluctuation (3 degrees), and quickly stabilize its center of gravity within 0.6 seconds.

Walking tests showed that the propeller significantly reduced fluctuations in posture and velocity, improving stability. With the propeller system, the robot moves smoother, reduces tilt fluctuations (from -3 degrees to 1 degree) and has a maximum speed of 1.1 meters per second, superior to without propeller support.

In the jump test, KOU-III successfully jumped onto the 18 cm high ladder and landed gently, maintaining balance. Although only 32 cm tall, the robot can jump up to 35.2 cm high. These results emphasize the importance of the propeller system in enhancing robot mobility and stability.

The research team said that integrating auxiliary mechanisms could be a crucial step, along with optimal control methods, to improve the mobility performance of legged robots. Thanks to that, they can move more flexibly on many types of terrain, increasing practical application.