Abstract
Input torque is themain power to maintain bipedal walking of robot, and can be calculated from trajectory planning and dynamic modeling on biped robot. During bipedal walking, the input torque is usually required to be adjusted due to some uncertain parameters arising from objective or subjective factors in the dynamical model to maintain the pre-planned stable trajectory. Here, a planar 5-link biped robot is used as an illustrating example to investigate the effects of uncertain parameters on the input torques. Kinematic equations of the biped robot are firstly established by the third-order spline curves based on the trajectory planning method, and the dynamic modeling is accomplished by taking both the certain and uncertain parameters into account. Next, several evaluation indices on input torques are introduced to perform sensitivity analysis of the input torque with respect to the uncertain parameters. Finally, based on the Monte Carlo simulation, the values of evaluation indices on input torques are presented, from which all the robot parameters are classified into three categories, i.e., strongly sensitive, sensitive and almost insensitive parameters.
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The project was supported by the National Natural Science Foundation of China (11142013, 11172260 and 11072214), the Doctoral Fund of Ministry of Education of China (20110101110016), and the Fundamental Research Funds for the Central Universities of China (2011QNA4001).
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Ding, CT., Yang, SX. & Gan, CB. Input torque sensitivity to uncertain parameters in biped robot. Acta Mech Sin 29, 452–461 (2013). https://doi.org/10.1007/s10409-013-0025-2
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DOI: https://doi.org/10.1007/s10409-013-0025-2