Acoustic levitation of multi-wavelength spherical bodies using transducer arrays of non-specialized geometries
Journal article, 2022

Recently, acoustic levitation of a wavelength-sized spherical object using a general-purpose ultrasonic transducer array was demonstrated. In this article, the possibility of extending the capabilities of such arrays to levitate multi-wavelength-sized objects is explored. The driving signals for the elements in the array are determined via numerical optimization of a physics-based cost function that includes components for trap stabilization. The cost function is balanced with an improved approach, mimicking dynamical de-weighting of the included components to avoid over-optimization of each individual component. Sound fields are designed and analyzed for levitation of objects with diameters up to 50 mm for various general-purpose simulated array configurations. For a 16 x 16 element transducer array, simulations predict levitation of spheres with diameters up to 20 mm (2.3 wavelengths), which is verified experimentally.

Author

Carl Andersson

Chalmers, Architecture and Civil Engineering, Applied Acoustics

Journal of the Acoustical Society of America

0001-4966 (ISSN) 1520-8524 (eISSN)

Vol. 151 5 2999-3006

Subject Categories

Aerospace Engineering

Vehicle Engineering

Signal Processing

DOI

10.1121/10.0010358

PubMed

35649903

More information

Latest update

5/25/2022