Abstract
The linear behaviour of the human leg was studied using a free oscillation method. The lower leg is represented by a simple mass, spring and dashpot model. Forty-five subjects underwent free vibration tests on their right legs. The force amplitude and the time period, for successive oscillations enabled calculation of the stiffness to mass ratio values. It was found that the time period of the second oscillation cycle was significantly lower than that of the first, implying a corresponding increase in stiffness. The experimental data consistently exhibits these non-linear characteristics, indicating that the use of non-linear models could be of benefit for future free oscillation studies.
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