An investigation of noncontact manipulation techniques based on acoustic levitation was undertaken in air. The standing wave acoustic levitation (SWAL) was observed when standing waves trap small objects at pressure nodes. In this paper, two ultrasonic bolt-clamped Langevin type transducers (BLTs) generating traveling waves by modulating parameters of the two traveling waves were used to manipulate a trapped object. Frequency, amplitude, and phase modulations of the two actuators were exploited. From simulation and experiments, the phase modulation was prominent among other methods due to its long range and smooth operation. It is also found that angles between two actuators affect the trajectory of the trapped object during the parameter modulations. Sinusoidal and elliptic paths of the object were observed experimentally through a combination of parameters at certain tilt angles.
Noncontact Manipulation of Light Objects Based on Parameter Modulations of Acoustic Pressure Nodes
Contributed by the Noise Control and Acoustics Division of ASME for publication in the Journal of Vibration and Acoustics. Manuscript received November 14, 2011; final manuscript received January 22, 2013; published online April 22, 2013. Assoc. Editor: Lonny Thompson.
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Park, J., and Ro, P. I. (April 22, 2013). "Noncontact Manipulation of Light Objects Based on Parameter Modulations of Acoustic Pressure Nodes." ASME. J. Vib. Acoust. June 2013; 135(3): 031011. https://doi.org/10.1115/1.4023816
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