극 저주파 범위에서의 인체 머리부 6자유도 진동 측정 및 추정시의 문제점에 대한 연구

Study on Some Problems in the Measurement and Estimation of 6 Degree of Freedom Head Vibration in Very Low Frequency Range

Two problems in the measurement of 6-DOF head vibration in very low frequency range were investigated in this study. One is how much error was involved in the estimation of three rotational and three translational motion at any specified point from measured 6 translational accelerations. The other is quantitative and qualitative influence of gravity on DC and AC component of the estimated accelerations in 6 degree of freedom, which were derived from pick-ups fixed on a helmet. In the study the effect of nonlinear terms on the estimation of 6 degree of freedom accelerations was negligible but gravity effect must be considered carefully.