Geometric conditions of a two-link-and-six muscle structure based on internal force stability

Abstract In a musculoskeletal system, internal tensile forces are generated among the muscles because it is a redundant system. The balancing of the internal tensile forces for a given posture generates a potential field in the system. Therefore, the potential field is utilized for the sensorless fe...

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Main Authors: Hiroaki Ochi, Hitoshi Kino, Kenji Tahara, Yuki Matsutani
Format: Article
Language:English
Published: SpringerOpen 2020-03-01
Series:ROBOMECH Journal
Subjects:
Online Access:http://link.springer.com/article/10.1186/s40648-020-00164-3
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spelling doaj-571641d1cb454aaf9c03685985e3fb2a2020-11-25T03:14:13ZengSpringerOpenROBOMECH Journal2197-42252020-03-017111610.1186/s40648-020-00164-3Geometric conditions of a two-link-and-six muscle structure based on internal force stabilityHiroaki Ochi0Hitoshi Kino1Kenji Tahara2Yuki Matsutani3Department of Mechanical Engineering, Faculty of Engineering, Sanyo-Onoda City UniversityDepartment of Intelligent Mechanical Engineering, Faculty of Engineering, Fukuoka Institute of TechnologyDepartment of Mechanical Engineering, Faculty of Engineering, Kyushu UniversityDepartment of Robotics, Faculty of Engineering, Kindai UniversityAbstract In a musculoskeletal system, internal tensile forces are generated among the muscles because it is a redundant system. The balancing of the internal tensile forces for a given posture generates a potential field in the system. Therefore, the potential field is utilized for the sensorless feedforward position control and improvement of stability based on the feedback method. However, the stability of the internal tensile forces is strongly influenced by the muscular arrangement. Previous studies showed that a stable condition can be identified through the minimization of the potential at a desired posture, and the sufficient condition has been theoretically established; however, the geometric condition of the muscular arrangement has not been determined. To effectively exploit the characteristics of the internal tensile forces, the geometric condition must be elucidated in the design of a musculoskeletal system. This paper aims to clarify the geometric condition to generate stable internal tensile forces. Based on the conditions generating the potential that is minimum at the desired posture, the paper analyzes that the geometric condition on a musculoskeletal structure with two-link and six-muscle. Additionally, the identified condition is assessed based on simulations. As a result, we revealed the geometric condition of the muscular arrangement to generate stable internal tensile forces. By designing the muscular arrangement to satisfy the condition, the stability of the internal tensile forces is ensured, and consequently, a control method utilizing the characteristics of the internal tensile force is stably implemented.http://link.springer.com/article/10.1186/s40648-020-00164-3Musculoskeletal structureInternal tensile forceStabilityMuscular arrangementDesign
collection DOAJ
language English
format Article
sources DOAJ
author Hiroaki Ochi
Hitoshi Kino
Kenji Tahara
Yuki Matsutani
spellingShingle Hiroaki Ochi
Hitoshi Kino
Kenji Tahara
Yuki Matsutani
Geometric conditions of a two-link-and-six muscle structure based on internal force stability
ROBOMECH Journal
Musculoskeletal structure
Internal tensile force
Stability
Muscular arrangement
Design
author_facet Hiroaki Ochi
Hitoshi Kino
Kenji Tahara
Yuki Matsutani
author_sort Hiroaki Ochi
title Geometric conditions of a two-link-and-six muscle structure based on internal force stability
title_short Geometric conditions of a two-link-and-six muscle structure based on internal force stability
title_full Geometric conditions of a two-link-and-six muscle structure based on internal force stability
title_fullStr Geometric conditions of a two-link-and-six muscle structure based on internal force stability
title_full_unstemmed Geometric conditions of a two-link-and-six muscle structure based on internal force stability
title_sort geometric conditions of a two-link-and-six muscle structure based on internal force stability
publisher SpringerOpen
series ROBOMECH Journal
issn 2197-4225
publishDate 2020-03-01
description Abstract In a musculoskeletal system, internal tensile forces are generated among the muscles because it is a redundant system. The balancing of the internal tensile forces for a given posture generates a potential field in the system. Therefore, the potential field is utilized for the sensorless feedforward position control and improvement of stability based on the feedback method. However, the stability of the internal tensile forces is strongly influenced by the muscular arrangement. Previous studies showed that a stable condition can be identified through the minimization of the potential at a desired posture, and the sufficient condition has been theoretically established; however, the geometric condition of the muscular arrangement has not been determined. To effectively exploit the characteristics of the internal tensile forces, the geometric condition must be elucidated in the design of a musculoskeletal system. This paper aims to clarify the geometric condition to generate stable internal tensile forces. Based on the conditions generating the potential that is minimum at the desired posture, the paper analyzes that the geometric condition on a musculoskeletal structure with two-link and six-muscle. Additionally, the identified condition is assessed based on simulations. As a result, we revealed the geometric condition of the muscular arrangement to generate stable internal tensile forces. By designing the muscular arrangement to satisfy the condition, the stability of the internal tensile forces is ensured, and consequently, a control method utilizing the characteristics of the internal tensile force is stably implemented.
topic Musculoskeletal structure
Internal tensile force
Stability
Muscular arrangement
Design
url http://link.springer.com/article/10.1186/s40648-020-00164-3
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AT kenjitahara geometricconditionsofatwolinkandsixmusclestructurebasedoninternalforcestability
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