A non-contact linear bearing and actuator via ultrasonic levitation

Ide, Takeshi; Friend, James; Nakamura, Kentaro; Ueha, Sadayuki

doi:10.1016/j.sna.2006.08.005

Cited by 59 publications

(28 citation statements)

References 31 publications

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“…In order to achieve large displacement levels, the operating frequency should be maintained close to the resonant frequency. Working with resonant systems results in a mechanical magnification inducing both large displacements and stresses [10][11][12][13][14]. In addition, high mechanical levels give rise to mechanical nonlinearities, even for excitation at low voltage levels.…”

Section: Introductionmentioning

confidence: 99%

High nonlinearities in Langevin transducer: A comprehensive model

2011

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Section: Introductionmentioning

confidence: 99%

High nonlinearities in Langevin transducer: A comprehensive model

2011

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“…If acoustic levitation were causing rotations, the rotors would be expected to rotate in the same direction as the SAW propagation, and at higher rotation speeds to what is observed. 8,9 The rotor direction therefore indicates the rotor is in frictional contact with the LN substrate. The retrograde motion of the substrate as the Rayleigh SAW propagates along it would cause a surface in frictional contact with it to move in a direction opposing the SAW propagation.…”

Section: Results Discussion and Conclusionmentioning

confidence: 99%

On-chip surface acoustic-wave driven microfluidic motors

et al. 2011

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We report on the design of two different surface acoustic wave (SAW) driven rotary motors. Both designs use 20-30 MHz transducers patterned onto Lithium Niobate (LN), geometrically tailored to generate Rayleigh waves that are incident on opposing sides of each rotor. The first design exploits the efficient coupling between SAWs and fluids by use of a fluid coupling layer between the rotor and substrate, leading to rotations of a 5 mm disc shaped rotor over 2,500 rpm with a start-up torque of 60 nN m. The second design exploits a dry friction contact between the surface and rotors for further miniaturisation. In the latter design 1 mm steel rotors are driven up to 6,000 rpm with no external preload required.

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“…As a promising alternative solution, the ultrasonic levitating bearing based on near-field acoustic levitation (NFAL) was proposed [9,10]. This kind of bearing carries a load using acoustic radiation force excited by piezoelectric ceramics.…”

Section: Introductionmentioning

confidence: 99%

A Novel Noncontact Ultrasonic Levitating Bearing Excited by Piezoelectric Ceramics

Quan

Deng

et al. 2016

Applied Sciences

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A novel ultrasonic levitating bearing excited by three piezoelectric transducers is presented in this work. The transducers are circumferentially equispaced in a housing, with their center lines going through the rotation center of a spindle. This noncontact bearing has the ability to self-align and carry radical and axial loads simultaneously. A finite element model of the bearing is built in ANSYS, and modal analysis and harmonious response analysis are conducted to investigate its characteristics and driving parameters. Based on nonlinear acoustic theory and a thermodynamic theory of ideal gas, the radical and lateral load-carrying models are built to predict the bearing's carrying capacity. In order to validate the bearing's levitation force, a test system is established and levitating experiments are conducted. The experimental data match well with the theoretical results. The experiments reveal that the maximum radical and axial levitating loads of the proposed bearing are about 15 N and 6 N, respectively, when the piezoelectric transducers operate at a working frequency of 16.11 kHz and a voltage of 150 V p-p .

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A non-contact linear bearing and actuator via ultrasonic levitation

Cited by 59 publications

References 31 publications

High nonlinearities in Langevin transducer: A comprehensive model

High nonlinearities in Langevin transducer: A comprehensive model

On-chip surface acoustic-wave driven microfluidic motors

A Novel Noncontact Ultrasonic Levitating Bearing Excited by Piezoelectric Ceramics

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