Abstract
The purpose of this research is to develop a synchronous vibration mechanism in order to reduce the hand-transmitted vibration. In this paper, we target an electric hammer and devise the impact model with two oscillators (Model 2). This model is examined analytically and is confirmed that the synchronized vibration for achieving a good balance between vibration control and excitation can be occurred. Also the impact model with one oscillator (Model 1) based on a common tool mechanism is devised as a target for comparison and the two models are examined analytically. As the result, the objective synchronized vibration exists in larger area in Model 2 than in Model 1 in the case that upper block is applied by static load and that the stiffness of constant of piecewise-linear spring which imitates crushed objects changes.
