Article | Proceedings of the 12th International Modelica Conference, Prague, Czech Republic, May 15-17, 2017 | Musculoskeletal Modeling of the Hand and Contact Object in Modelica
Göm menyn

Title:
Musculoskeletal Modeling of the Hand and Contact Object in Modelica
Author:
Shashank Swaminathan: Novi, Michigan, USA Johan Andreasson: Modelon KK, Japan
DOI:
10.3384/ecp17132745
Download:
Full text (pdf)
Year:
2017
Conference:
Proceedings of the 12th International Modelica Conference, Prague, Czech Republic, May 15-17, 2017
Issue:
132
Article no.:
081
Pages:
745-754
No. of pages:
10
Publication type:
Abstract and Fulltext
Published:
2017-07-04
ISBN:
978-91-7685-575-1
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press, Linköpings universitet


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The paper’s primary goal is to develop a mathematical model that could be used towards the development and improvement of orthotic assist gloves. The model is constructed using component based modeling in the object-oriented declarative language Modelica, specifically the MultiBody Modelica library. Multiple hand models currently do exist; however, they are mainly causal, and require separate development and validation of mathematical solvers before use. By using Modelica, the model is constructed from the system‚Äôs physical equations, thereby relieving issues regarding validity of the model‚Äôs computational equations; the acausality inherent in Modelica allows for more model development that more closely mirrors relations in the physical world. The model is scoped to be able to model the kinematics and dynamics of the hand when grasping a spherical object ‚Äď both bone structure and muscle geometry and actuation are simplifications based off anatomy literature. The contact model is developed as a separate component from the hand system. The main design goal of the contact model is to represent the characteristics of a relatively rigid object that still maintains a degree of friction and pliability on the surface layer. The main two grasps tested in the paper are the prehensile and precision grasps (powerful and dexterous grasps). The muscle actuation profiles per each finger are adjusted until the desired dynamic profile is achieved for each type of grasp. The main data points of interests are the joint angles and contact forces for each finger. Further validation of the model is done using the animation automatically generated by the tool. Testing results indicate that the model can successfully simulate contractions at all levels of abstraction of the hand‚Äôs components (basic bone-joint components, finger components, and the overall hand system). The results also indicate that both prehensile and precision grasps are possible, given appropriate muscle actuation and finger orientation parameter values.

Keywords: musculoskeletal model of the hand Modelica grasp model orthotic devices

Proceedings of the 12th International Modelica Conference, Prague, Czech Republic, May 15-17, 2017

Author:
Shashank Swaminathan, Johan Andreasson
Title:
Musculoskeletal Modeling of the Hand and Contact Object in Modelica
DOI:
http://dx.doi.org/10.3384/ecp17132745
References:
No references available

Proceedings of the 12th International Modelica Conference, Prague, Czech Republic, May 15-17, 2017

Author:
Shashank Swaminathan, Johan Andreasson
Title:
Musculoskeletal Modeling of the Hand and Contact Object in Modelica
DOI:
http://dx.doi.org/10.3384/ecp17132745
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Last updated: 2017-02-21