Cagran et al.: Dynamic force measurements for a high bar using 3D motion capturing

Cagran, C; Huber, P; Müller, W.
Dynamic force measurements for a high bar using 3D motion capturing.
J Biomech. 2010; 43(4): 767-770. [Fulltext] [PubMed]

Abstract:
The displacement of a calibrated horizontal bar is used as a measure for forces acting on the bar itself during dynamic performances in artistic gymnastics. The high bar is loaded with known forces and the displacement is monitored by means of a Vicon motion capturing system. The calibration results are fitted according to the Euler-Bernoulli beam theory. After calibration, forces can straightforwardly be measured by multiplication of the bar displacement with the determined fit parameter. This approach is also able to account for non-central force application (two hands on the bar) and the effect of the bar's inertia. Uncertainties in measured forces are assessed to be +/-25N plus an additional 1% for the unknown weight distribution between the two hands.


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