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Optimal Trajectory Generation and Design of an 8-DoF Compliant Biped Robot for Walk on Inclined Ground

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Abstract

Robots with joint or link compliance are gaining importance due to their inherent safety. In this paper four different designs of compliant shanks of an 8 degrees of freedom (DoF) biped robot are compared to get the least energy consumed during walk. Different leg and pelvis trajectories of the biped during walk are generated by varying the gait parameters. The deflection of the compliant links during walk is modeled using a finite element method (FEM). Simulations are carried out in which the optimal walking trajectory that consumes least energy is found by using a genetic algorithm (GA). Balance is ensured during walk by ensuring that the trajectory always satisfies the zero moment point (ZMP) criteria. The optimal trajectories obtained from the simulations were then experimentally evaluated for a compliant link biped robot. The motion of the different joints of the biped during the experiment was tracked using a vision system and the performance of the rigid link and compliant link bipeds compared. The best compliant link design was finally chosen from the four different designs.

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  1. Mechanical Engineering Department, IIT Kanpur, Kanpur, India

    Abhishek Sarkar & Ashish Dutta

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  1. Abhishek Sarkar
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  2. Ashish Dutta
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Correspondence to Ashish Dutta.

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Sarkar, A., Dutta, A. Optimal Trajectory Generation and Design of an 8-DoF Compliant Biped Robot for Walk on Inclined Ground. J Intell Robot Syst 94, 583–602 (2019). https://doi.org/10.1007/s10846-018-0882-9

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