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: This experimental study aimed at acquiring detailed data about the human transmission behaviour as a basis for an improved estimation of the strain, induced by whole body vibration (wbv). Four male subjects were exposed to vertical sinusoidal wbv (2-12 Hz 1.5 and 3.0 ms-2 RMS).The steady state force response was measured at the input interface, and accelerations were registered at the seat, head, shoulder, and upper trunk. Transmissibilities and apparent mass as quotients of RMS-values were determined. In addition, the corresponding quotients of peak values, as well as their accompanying phase angles were calculated separately for maximum acceleration or minimal acceleration, and for the extreme values of apparent mass in relation to the body mass.

Most research has investigated the seat-to-head transmissibility during single-axis excitations. Associations between head accelerations and discomfort or effects on vision were reported. Possible differences between the seatto-head transmissibility determined during different vibration magnitudes with a variable number of excitation axes have not been systematically examined. An experimental study was performed with 8 male subjects sitting on a rigid seat with hands on a support. They were exposed to random whole-body vibration (E1=0.45 ms -2 , E2=0.90 ms -2 , and E3=1.80 ms -2 ) to single-and three-axis vibration. All translational and rotational seat-to-head transmissibilities were calculated. The effects of the factors vibration magnitude and number of axes on the peak modulus and frequency of the seat-to-head transmissibilities were tested. In general the head motions follow constant pattern. These pattern of head motions comprise a combination of rotational and translational shares of transmissions, i.e. the curves show a dependence on the factors 'vibration magnitude' and 'number of vibration axes'. Mechanical properties of the soft tissue, relative motions of body parts, and muscle reactions were supposed to cause the nonlinearities of the head. Future research should consider effects of multi-axis vibration, if conclusions shall be drawn for the evaluation of possible health effects and model validations.

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