An acoustic levitation test bench was built to successfully suspend a small ball of a certain density. It was found that the smaller the diameter and density of the suspended sample, the easier it is to suspend. The diameter of the sample should not be larger than 1/4 - 1/3 of the wavelength of the acoustic wave. In addition, as the sound pressure increases, the sound flow also affects the stability of the acoustic levitation. Comsol was used to nu-merical simulation the spatial sound field, pressure field and particle ve-locity distribution of different suspension cavity heights, and the factors affecting the acoustic levitation capacity were analyzed.
Shaw, E.A. (1974) Transformation of Sound Pressure Level from the Free Field to the Eardrum in the Horizontal Plane. Journal of the Acoustical Society of America, 56, 1848-1861. https://doi.org/10.1121/1.1903522