Development of a biped walking robot adapting to a horizontally uneven surface

In this paper, as the first stage of biped walking adapting to an uneven surface using an anthropomorphic biped walking robot, the authors introduce a biped walking control method for adapting to a surface that is called a horizontally composed (HC) plane whose step height is unknown, and a special foot mechanism which is capable of shock absorbtion. The authors developed an anthropomorphic biped walking robot with a foot mechanism and performed walking experiments with the robot using the control method. As a result, adaptive dynamic biped walking over a step of unknown height was realized. The maximum walking speed was 0.96 sec per step with a 0.3 m step length, and the greatest step height was 12 mm. The authors believe that the adaptability is integral to an anthropomorphic robot that will support human living in the near future. The authors call the robot Humanoid.<<ETX>>