Damping Induced by Bobbing or Jumping Persons

摘要

The human body forms a complex non-linear dynamic system which for engineering purposes usually is simplified as a linear single or two degree of freedom system. For passive persons, a corresponding probabilistic model exists for the basic dynamic parameters of the human body [1]. A similar refined approach for persons performing rhythmic activities is missing. However, the IstructE-guideline [3] specifies for the activity bobbing dynamic parameters of the human body which can be understood as mean values for larger groups. The paper aims in analyzing the random inter-subject scatter in the dynamic parameters of the human body, applying the theoretical approach which has been used for the IstructE-guideline. Furthermore, field tests are performed to study the influence of the frequency of the activity. The analysis is extended to jumping as well. The results suggest that the frequency of the activity influences the dynamic parameters of the human body. The inter-subject scatter is large enough to doubt that a mean value forms an appropriate design value even for larger groups.