Analyses of distributed absorbed power responses of the human hand-arm system in the bent- and extended-arm postures
Keywords:Biomechanics, Absorbed power, Arm posture, Biomechanical model, Driving point impedances, Energy distributions, Hand-arm system, Random excitations, Total power
AbstractBiomechanical models of the hand-arm system in the bent- and extended-arm postures subject to zh-axis vibration were applied to derive the energy distribution within different substructures of the hand-arm system. The parameters of the models were derived on the basis of both the driving-point impedance and vibration transmitted to different segments of the hand-arm measured, using six subjects under broadband random excitation. The distributed and total power responses of the hand-arm system models under random excitations for both the postures were described. Significant effect of excitation and posture on the absorbed power is observed. Despite similarities in trends shown by segmental absorbed power, the values of absorbed power in the extended arm posture are significantly greater than those in the bent-arm posture for the same overall frequency-weighted vibration.
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