Characteristics of Ultrasonic Suspension Actuation Force
M. Takasaki, S. Chino, R. Chida, Y. Ishino, T. Mizuno
Saitama University, Saitama-shi, Japan
In ultrasonic levitation, an object can be levitated vertically upward above vibrating surface of an ultrasonic transducer. On the other hand, it has been reported that an object can be suspended vertically downward under the vibrating surface in the air. We call this phenomenon ultrasonic suspension. When an object is suspended, there is restoring force, which attracts the object horizontally to the center of the vibrating surface. Characteristics of the forces acting vertically and horizontally were investigated experimentally. For this purpose, a servo type measuring mechanism was fabricated. The mechanism consisted of a base suspended by thin wires and three voice coils to stabilize the base in x axis, z axis and roll axis. The suspended object, which was a disk, was fixed on the base vertically. Ultrasonic transducer with a horn equipped with a replaceable cap
to change its diameter was fixed horizontally and approached against the fixed object. While ultrasonic vibration was being excited, actuation forces acting on the object were measured as coil currents under PID control of the base. By this mechanism, relative position between the object and the cap could be arranged. Relationships between actuation forces and suspended object conditions like vibration amplitude, relative position of the object and diameters of the object / vibrating surface were investigated experimentally. Vertical attractive force can be generated if the diameter of the object and surface is smaller than 8 mm. Horizontal restoring force was obtained, but not strong as vertical one.
ACTUATOR 2016 Manuscript A1.8
Publication date: 01/06/2016
Manuscript A1.8 published in Conference Proceedings ACTUATOR 2016
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