船上における人体の応答とバランス判定関数について

抄録

The authors have studied about the relationship between ship motions and human balance and clarified the response characteristics of human body for ship oscillatory motions and the statistical discriminant method of human balance^<(1-4)>. In this paper, the authors estimated the frequency response of human body, particularly on the X-direction (anterior-posterior). In regard to the human balance for ship motions, we carried out the sufficient experiments and analyzed statistically. The following results are obtained : (1) Response characteristics for large ship motions that subject can't maintain his balance is almost the same as those for ordinal ship motions that subjects keep his balance stably. (2) As differences between the response characteristics of human body for all subject is very small, the response characteristics of human body for the ship motions indicate inherent value on frequency response. (3) Based on the first spectra moment M_1 of the ship accelerations which correspond to the facing direction of subject, it's estimated the discriminant function of human balance is T=M_<1X>+0.1167M_<1Y>+0.1530M_<1Z>, and the threshold value is 0.1958.