Dynamic force measurements for a high bar using 3D motion capturing.
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 +/-25 N plus an additional 1% for the unknown weight distribution between the two hands.
Cagran
C
C
Human Performance Research Graz, University of Graz, Max-Mell-Allee 11, 8010 Graz, Austria. claus.cagran@uni-graz.at
Huber
P
P
Müller
W
W
D003198:Computer Simulation; D055119:Elastic Modulus; D019544:Equipment Failure Analysis; D006173:Gymnastics / Q000502:physiology*; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008962:Models, Theoretical; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D019876:Sports Equipment; D013314:Stress, Mechanical