Influence of Hand Dynamics on the Vibration Transmissibility Characteristics of a Suspended Handle

摘要

The influence of the hand-arm system dynamics on the acceleration vibration transmissibility characteristics of a suspended handle subjected to a random acceleration excitation in the 10 to 500 Hz frequency range is investigated under different values of grip and push forces. Increasing the push force over the range 0 to 80 N is observed to result into increased damping within the suspended handle acceleration transmissibility response function, while increasing the grip force over a similar range results in both increased damping and stiffness of the system combining the handle and the hand-arm. By representing the handle with a mass-spring system and the hand-arm with a four degree-of-freedom free impedance model as defined in the ISO 10068 standard, the results of the simulation are observed to provide a good agreement with the acceleration transmissibility response function measured while using a 50 N push force and a 50 N grip force.