Integrated Structure-Control Design of a Bipedal Robot Based on Passive Dynamic Walking

Mathematics

Josué Nathán Martínez-Castelán¹  Miguel Gabriel Villarreal-Cervantes¹ 

[1] Mecatronic Section, Postgraduate Department, Instituto Politécnico Nacional, CIDETEC, Mexico City 07700, Mexico;

关键词: structure-control design;    optimization;    passive bipedal walker;    bipedal robots;    differential evolution;   

DOI  :  10.3390/math9131482

来源: DOAJ

【 摘 要 】

The design of bipedal robots is generally fulfilled through considering a sequential design approach, where a synergistic relationship between its structure and control features is not promoted. Hence, a novel integrated structure-control design approach is proposed to simultaneously obtain the optimal structural description, the torque magnitudes, and the on/off time intervals for the control signal input of a semi-passive bipedal robot. The proposed approach takes advantage of the natural dynamics of the system and the control signal activation/deactivation for generating stable gait cycles with minimum energy consumption. Consequently, the passive features of the semi-passive bipedal robot are included in the integrated structure-control design process through evaluating the system behavior along consecutive passive and semi-passive walking stages. Then, the proposed design approach is formulated as a nonlinear discontinuous dynamic optimization problem, where the solution search is carried out using the differential evolution algorithm due to the discontinuities of the semi-passive bipedal robot dynamics. The results of the proposal are compared with those obtained by a sequential design process. The integrated structure-control design achieves a reduction of $63.55\%$ in the value of the performance function related to the synergy between the walking capability and energetic efficiency, with a reduction in the activation of the control and its magnitude of $95.41\%$.

【 授权许可】

Unknown