Abstract
It is necessary to examine what kind of vibration and swinging motion is comfortable, in order to develop the comfortable human-machine interface using vibration or swinging motion. This study focused on the fluctuation in periods of rhythms produced by humans; especially a body swing in walking for enjoyment was examined. First, a portable measurement system for measuring the three-axial acceleration near examinee's ear was developed. Batteries for the acceleration sensors and a battery driven portable data recorder were put in a knapsack which the walker wore. Then, the accelerations in the walking were measured, and the power spectrum of the period fluctuation was examined. As the result, it was clarified that the power spectrum showed the tendency of downward-sloping in the low frequency range, and it showed the relation of "1/f" almost averagely.
