Dynamic analysis of impact in swing-through crutch gait using impulsive and continuous contact models
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Tipus de documentArticle
Data publicació2012-09-01
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Abstract
The dynamics associated with the impact of the crutch with the ground is an important
topic of research, since this is known to be the main cause of mechanical energy
loss during swing-through gait. In this work, a multibody system representing a subject
walking with crutches is used to investigate the behavior of two different contact models,
impulsive and continuous, used for impact analysis. In the impulsive (discrete) approach,
the impact interval is considered to be negligible and, therefore, the system configuration
is constant. The postimpact state is directly obtained from the preimpact one through algebraic
equations. In the continuous approach, the stiffness and dissipation characteristics of
the contact surfaces are modeled through nonlinear springs and dampers. The equations of
motion are integrated during the impact time interval to obtain the postimpact state, which,
in principle, can differ from that obtained by means of the impulsive approach. Although
both approaches have been widely used in the field of biomechanics, we have not found any
comparative study in the existing literature justifying the model chosen for impact analysis.
In this work, we present detailed numerical results and discussions to investigate several
dynamic and energetic features associated with crutch impact. Based on the results, we compare
the implications of using one contact model or the other.
CitacióFont-Llagunes, J.M. [et al.]. Dynamic analysis of impact in swing-through crutch gait using impulsive and continuous contact models. "Multibody system dynamics", 01 Setembre 2012, vol. 28, núm. 3, p. 257-282.
ISSN1384-5640
Versió de l'editorhttp://www.springerlink.com/content/d05j2x48l5143547/
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