A modeling framework to investigate the radial component of the pushrim force in manual wheelchair propulsion
Nenhuma Miniatura disponível
Citações na Scopus
4
Tipo de produção
Artigo de evento
Data
2015-11-25
Autores
Marko Ackermann
COSTA, H. R.
Fabrizio Leonardi
COSTA, H. R.
Fabrizio Leonardi
Orientador
Periódico
MATEC Web of Conferences
Título da Revista
ISSN da Revista
Título de Volume
Citação
ACKERMANN, M.; COSTA, H. R.; LEORNARDI, F. A modeling framework to investigate the radial component of the pushrim force in manual wheelchair propulsion. MATEC Web of Conferences, v. 35, Nov. 2015.
Texto completo (DOI)
Palavras-chave
Resumo
© Owned by the authors, published by EDP Sciences, 2015.The ratio of tangential to total pushrim force, the so-called Fraction Effective Force (FEF), has been used to evaluate wheelchair propulsion efficiency based on the fact that only the tangential component of the force on the pushrim contributes to actual wheelchair propulsion. Experimental studies, however, consistently show low FEF values and recent experimental as well as modelling investigations have conclusively shown that a more tangential pushrim force direction can lead to a decrease and not increase in propulsion efficiency. This study aims at quantifying the contributions of active, inertial and gravitational forces to the normal pushrim component. In order to achieve this goal, an inverse dynamics-based framework is proposed to estimate individual contributions to the pushrim forces using a model of the wheelchair-user system. The results show that the radial pushrim force component arise to a great extent due to purely mechanical effects, including inertial and gravitational forces. These results corroborate previous findings according to which radial pushrim force components are not necessarily a result of inefficient propulsion strategies or hand-rim friction requirements. This study proposes a novel framework to quantify the individual contributions of active, inertial and gravitational forces to pushrim forces during wheelchair propulsion.