Recent development of ultrasonic actuators

Author

Ueha, Sandayuki

Author_Institution

Precision & Intelligence Lab., Tokyo Inst. of Technol., Yokohama, Japan

Volume

1

fYear

2001

fDate

2001

Firstpage

513

Abstract

A phenomenon of near-field acoustic levitation (NFAL) in air has been successfully applied to non-contact transportation where planar objects of several kilograms in weight are levitated and transported. The characteristics of NFAL in air was again studied, because some peculiar characteristics were found in underwater NFAL in which an attractive acoustic force acts on a planar object under certain conditions, and no attractive acoustic force had been observed in the frequency range of 17 to 30 kHz for the NFAL in air. However, an attractive force was proved to exist also in NFAL in air and the conditions for attractive force were determined. This acoustic attractive force is, however, successfully used for non-contact transportation of plates in liquids as well. In this paper, ultrasonic actuators based on NFAL are described together with the phenomena and the theory

Keywords

piezoelectric actuators; ultrasonic applications; ultrasonic transducers; 17 to 30 kHz; attractive acoustic force; near-field acoustic levitation; noncontact transportation; ultrasonic actuators; Actuators; Air transportation; Frequency; Levitation; Liquids; Underwater acoustics;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 2001 IEEE

Conference_Location

Atlanta, GA

Print_ISBN

0-7803-7177-1

Type

conf

DOI

10.1109/ULTSYM.2001.991675

Filename

991675