Investigation of hand-arm vibration by means of mechanical impedance techniques has provided objective evaluation of the observation that most of the higher frequency vibration inputs at the hand are not transmitted into the arm. This is reflected in the impedance curves which show two orders of magnitude decrease in apparent mass as frequency is increased from 50 Hz to 1000 Hz. The system may be modeled as damped spring-mass system containing three masses interconnected by springs and dampers.
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