Human sit-to-stand transfer modeling towards intuitive and biologically-inspired robot assistance
Sit-to-stand (STS) transfers are a common human task which involves complex sensorimotor processes to control the highly nonlinear musculoskeletal system. In this paper, typical unassisted and assisted human STS transfers are formulated as optimal feedback control problem that finds a compromise bet...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2017
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| In: |
Autonomous robots
Year: 2016, Volume: 41, Issue: 3, Pages: 575-592 |
| ISSN: | 1573-7527 |
| DOI: | 10.1007/s10514-016-9553-5 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1007/s10514-016-9553-5 Verlag, Volltext: https://link.springer.com/article/10.1007/s10514-016-9553-5 
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| Author Notes: | Milad Geravand, Peter Zeno Korondi, Christian Werner, Klaus Hauer, Angelika Peer |
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| 520 | |a Sit-to-stand (STS) transfers are a common human task which involves complex sensorimotor processes to control the highly nonlinear musculoskeletal system. In this paper, typical unassisted and assisted human STS transfers are formulated as optimal feedback control problem that finds a compromise between task end-point accuracy, human balance, energy consumption, smoothness of motion and control and takes further human biomechanical control constraints into account. Differential dynamic programming is employed, which allows taking the full, nonlinear human dynamics into consideration. The biomechanical dynamics of the human is modeled by a six link rigid body including leg, trunk and arm segments. Accuracy of the proposed modelling approach is evaluated for different human healthy and patient/elderly subjects by comparing simulations and experimentally collected data. Acceptable model accuracy is achieved with a generic set of constant weights that prioritize the different criteria. Finally, the proposed STS model is used to determine optimal assistive strategies suitable for either a person with specific body segment weakness or a more general weakness. These strategies are implemented on a robotic mobility assistant and are intensively evaluated by 33 elderlies, mostly not able to perform unassisted STS transfers. The validation results show a promising STS transfer success rate and overall user satisfaction. | ||
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