抄録
It is experimentally known that a flat surface vibrating at ultrasonic frequencies generates forces acting to a floating object in both the vertical and parallel directions to a vibrating surface, and these forces can hold a floating object at an equilibrium position without any contact. In addition, it was found in this paper that a vibrating surface can generate a pull force to an object even if there is no contact. Therefore, in this paper, the cause of the pull force of the vibrating surface is investigated, experimentally and numerically. It is consequently confirmed that the pull force is generated by the effect of in- and out-flows at the vibrating surface edge.
