Abstract
The purpose of this study is to investigate dynamic characteristics of the human body in a sitting position, by performing multidirectional excitation. Vibrational testing is performed using a three-axial shaking table on which a wooden seat is attached. Experiment participants sitting on the seat are subjected to excitation in three directions, i.e., fore-and-aft (x-axis), lateral (y-axis) and vertical (z-axis), in random order. The dynamics of the seated human body are characterized by transfer functions between the seat and the head. By measuring the vibration at the mouth and forehead, rotational transfer functions such as roll and pitch, as well as translational transfer functions, are obtained. In the results, two resonant peaks are observed between 0 Hz and 20 Hz in each translational direction. It is observed that the fore-and-aft motion and the vertical motion are coupled. It is experimentally confirmed that this dynamic coupling is caused by the pitch motion of the head.
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