Abstract
It is known that when ultrasonic vibration is applied on the top of a stack of sheets, the friction between sheets reduces. This reduction of friction is thought to be due to the separation of sheets by vibration. However, the relationship between the vibration of sheets and the reduction of friction is still not fully understood. In this study, we have observed the physical change that occurs in a sheet along with vibration such as frictional force, levitation height and oscillatory waveform. When the load increased, the frictional force increased and the levitation height decreased. These results indicate that there is a direct correlation between levitation height and frictional force. It was suggested that acoustic levitation is caused on a sheet by vibrating the sheet.
