Boundary condition relaxation method for stepwise pedipulation planning of biped robots

  • Authors:
  • Tomomichi Sugihara;Yoshihiko Nakamura

  • Affiliations:
  • School of Information Science and Electrical Engineering, Kyushu University, Fukuoka, Japan;Department of Mechano-Informatics, University of Tokyo, Tokyo, Japan

  • Venue:
  • IEEE Transactions on Robotics - Special issue on rehabilitation robotics
  • Year:
  • 2009

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Abstract

A completely stepwise online pedipulation planning method is proposed. It is an analytical approach based on the general solution of the equation of motion of an approximate dynamical biped model whose mass is concentrated at the center of mass. A physically feasible referential trajectory with a constraint about the reaction force taken into account is planned only in one interval by relaxing the boundary condition, namely, by admitting a certain level of error between the desired and actually reached states, and discontinuity of zero-moment point at each end of the interval. It potentially creates responsivemotions that require strong instantaneous acceleration. A semiautomatic continual pedipulation planning method is also presented. It generates a referential trajectory of the whole body only from the next desired foot placement. The validity of the proposed method is ensured through experiments with a small anthropomorphic robot.