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Research Papers

Noncontact Manipulation of Light Objects Based on Parameter Modulations of Acoustic Pressure Nodes

[+] Author and Article Information
Joong-kyoo Park

e-mail: jpark15@ncsu.edu

Paul I. Ro

e-mail: ro@ncsu.edu
Department of Mechanical and Aerospace
Engineering,
North Carolina State University,
Raleigh, NC 27695-7910

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.

J. Vib. Acoust 135(3), 031011 (Apr 22, 2013) (7 pages) Paper No: VIB-11-1275; doi: 10.1115/1.4023816 History: Received November 14, 2011; Revised January 22, 2013

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.

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Figures

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Fig. 1

Standing wave acoustic levitation (SWAL): (a) a conventional design with reflector and (b) a proposed design in two different tilt angles

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Fig. 2

Near-field pressure of a circular piston (amplitude of the particle speed = 1 m/s)

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Fig. 3

Parameter modulation simulations: (a) frequency modulation, (b) amplitude modulation, and (c) phase modulation

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Fig. 4

Combination of parameter modulation simulations. Left: effective pressure and right: normalized local velocity.

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Fig. 6

Frequency and amplitude modulation: (a) upper: 49.6 kHz and lower: 49.6 kHz V, (b) upper: 38.1 kHz and lower: 49.6 kHz, (c) upper: 26.7 kHz and lower: 49.6 kHz, (d) upper: 10 V and lower: 300 V, (e) upper: 300 V and lower: 300 V, and (f) upper: 300 V and lower: 10 V)

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Fig. 7

Phase modulation and 150 deg tilt angle: (a), (b), and (c): upper actuator from 360 deg to 0 deg phase change; (d), (e), and (f): lower actuator from 0 deg to 360 deg phase change

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Fig. 8

Phase and amplitude modulation at 150 deg tilt angle (amplitude for the upper actuator at 400 V and the lower actuator at 200 V)

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