Control of a 5-link biped robot for steady walking

Trajectory planning methods and control algorithms for biped robot steady walking are discussed. The model following plus variable structure systems technique is developed for the control of dynamic walking in the sagittal plane. The nonlinear feedback plus modified alpha -computed torque technique is introduced for walking in the frontal plane. simulation results are provided for level walking and ascending on staircases for a five-link biped robot. These results indicate that the proposed algorithms could achieve robust trajectory tracking even in the presence of system modeling errors. Specifically, simulation results show that, even in the presence of disturbances, gait stability can be achieved within two steps after the start of walking. In addition, the biped robot can walk with prespecified patterns.<>