The model of a legged locomotory system is optimized to ensure stable
motion, reliable with respect to different initial conditions. The cos
t function suggested is based on the frequency of the model's loss of
stability evaluated for randomly chosen initial leg positions. The opt
imized model can start from the majority of allowed leg configurations
, demonstrating stable walking at low and moderate speeds. Furthermore
, an acceleration procedure is designed to permit the model to pick up
practically every speed and then walk successfully. (C) 1998 Elsevier
Science Ltd. All rights reserved.