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Journal Articles IEEE Robotics and Automation Letters Year : 2022

On-line feasible wrench polytope evaluation based on human musculoskeletal models: an iterative convex hull method

Abstract

Many recent human-robot collaboration strategies, such as Assist-As-Needed (AAN), are promoting humancentered robot control, where the robot continuously adapts its assistance level based on the real-time need of its human counterpart. One of the fundamental assumptions of these approaches is the ability to measure or estimate the physical capacity of humans in real-time. In this work, we propose an algorithm for the feasibility set analysis of a generic class of linear algebra problems. This novel iterative convex-hull method is applied to the determination of the feasible Cartesian wrench polytope associated to a musculoskeletal model of the human upper limb. The method is capable of running in real-time and allows the user to define the desired estimation accuracy. The algorithm performance analysis shows that the execution time has near-linear relationship to the considered number of muscles, as opposed to the exponential relationship of the conventional methods. Finally, real-time robot control application of the algorithm is demonstrated in a Collaborative carrying experiment, where a human operator and a Franka Emika Panda robot jointly carry a 7kg object. The robot is controlled in accordance to the AAN paradigm maintaining the load carried by the human operator at 30% of its carrying capacity.
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Dates and versions

hal-03369576 , version 1 (13-10-2021)
hal-03369576 , version 2 (03-03-2022)

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Antun Skuric, Vincent Padois, Nasser Rezzoug, David Daney. On-line feasible wrench polytope evaluation based on human musculoskeletal models: an iterative convex hull method. IEEE Robotics and Automation Letters, inPress, ⟨10.1109/LRA.2022.3155374⟩. ⟨hal-03369576v2⟩
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