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Classification of periodic and chaotic passive limit cycles for a compass-gait biped with gait asymmetries
Jae-Sung Moon, Mark W. Spong
Journal:

Robotica / Volume 29 / Issue 7 / December 2011

Published online by Cambridge University Press:

23 March 2011, pp. 967-974
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In this paper we study the problem of passive walking for a compass-gait biped with gait asymmetries. In particular, we identify and classify bifurcations leading to chaos caused by the gait asymmetries because of unequal leg masses. We present bifurcation diagrams showing step period versus the ratio of leg masses at various walking slopes. The cell mapping method is used to find stable limit cycles as the parameters are varied. It is found that a variety of bifurcation diagrams can be grouped into six stages that consist of three expanding and three contracting stages. The analysis of each stage shows that marginally stable limit cycles exhibit period-doubling, period-remerging, and saddle-node bifurcations. We also show qualitative changes regarding chaos, i.e., generation and extinction of chaos follow cyclic patterns in passive dynamic walking.