Abstract
We are developing a quasi-passive dynamic walking robot with swinging torso. Our experimental approach over several years to the real walking is really successful so far, and the robot walks not only on the horizontal plane but also on the gentle slope, yet the theoretical analysis of motion of this robot has been left unsolved. This time, we modeled the robot as underactuated mechanical links and formalized motion equations from the viewpoint of sagittal and lateral plane. We made discussions on the several assumptions in the modeling for the simulation experiments of the robot.
