1990 Volume 52 Issue 4 Pages 37-43
A vibration-isolating handle grip which has a vibration node at its grip point was designed and equipped on a walking type tractor and a tea plucker.
Measurements of hand-transmitted vibration showed that redction of vibration level was achieved in X-and Z-direction, but no effects were observed for Y direction which coincides with the direction of the axis of handle grip.
To actualize the reduction of hand-transmitted vibration in three directions, another handle was designed. In this type two isolating mechanisms were incorporated for a single grip. The principle of each mechanism was the same as in the handle grip of above mentioned trial, but this handle was structured so that two mechanisms were placed in a nearly perpendicular position to each other (‘DI handle’). Specifications of these mechanisms were determined of modal analysis, finite element method and building block approach. Measurements of hand-transmitted vibration of a bush cleaner with ‘DI handle’ revealed that vibration reduction to the intended target in X-, Y-, and Z-direction was nearly attained in the range of engine speed, 6, 500-10, 000rpm.
