Abstract
It is necessary to examine comfortable vibrations and swinging motions used in the development of a human-machine interface. The author focused on the period fluctuations of rhythms produced by humans for their own enjoyment. The rhythms occurring when walking comfortably, hopping on a pogo stick, bouncing on an exercise ball, swinging on a swing, and dribbling a basketball were measured using a portable acceleration measurement system or a sound recording system. Then, periods of the rhythms were obtained, and the power spectra were examined. As a result, the power spectra showed a downward slope within a low-frequency range; that is, they are similar to the property of 1/f. In this study, the results of the frequency analysis were examined and compared. It was clarified that these power spectra have about the same magnitude, the periods are about the same, and the period fluctuations are not very large.
