Most common models of hand-arm systems describe the mechanical response by low accelerations and short movements. The focus of this paper is on impacts (over 4.000 m/s2) to the human hand-arm system, in this case caused by a bolt setting device. To develop an accurate model of the hand-arm system, the force needed to be measured without to influence the interaction. Because of the very short time period it is not possible to measure the reaction force directly. To investigate the effects of different operators on the behavior of the power tool, a two-degree-of-freedom model of hand-arm-systems is developed, to predict mechanical interactions of the hand-arm-system with the power tool. Inputs for this simulation model are movement, velocity and acceleration. The motion of the device in the heavy impact phase is tracked by a high-speed camera and time-synchronized acceleration sensors. Based on this data, a robust and easy model of a hand-arm system is presented.

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