Dynamic Walk Control of a Biped Robot with Potential Energy Conserving Orbit

摘要

In a study of the dynamic walk of a biped robot, it is required to extract the dominant dynamics of the walking machine by reducing the dimension of the motion equation in some way.As the dominant dynamics, the following properties are shown about inverted pendulum with expandable leg when an input force is provided to balance its vertical component with its own weight.1. The center of gravity moves horizontally.2. The horizontal movement of the center of gravity can be expressed by linear differential equation.It is confirmed that the same phenomenon is shown both at the inverted pendulum with torso both at the inverted pendulum made by 5 links. The orbit on which the center of gravity moves is named, the “Potential Energy Conserving Orbit.”Based on these properties, control laws were formulated for walk initiation, walk continuation, and walk termination. The walking speed is controlled through the leg exchanging condition. The possibility of dynamic walk of a biped robot has been confirmed by computer simulation. The manufactured walking machine has 4 DC motors in its torso, and has ostrichlike legs which have parallel link structure.Using this machine, we realized 5 stepsof dynamic walk, including walk initiation.