A comparison of acoustic levitation with microgravity processing for containerless solidification of ternary Al–Cu–Sn alloy

Niu, Y.; Hong, Zhenyu; Geng, D. L.; Wei, B.

doi:10.1007/s00339-015-9151-y

Cited by 17 publications

(7 citation statements)

References 23 publications

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“…Trapping of objects by means of acoustic forces is used in various areas such as chemistry [1], bioreactors [2,3], blood analysis [4], the study of organisms in microgravity [2,5], control of nanomaterial self-assembly [6], containerless processing [7][8][9], and to study droplet dynamics [10,11].…”

Section: Introductionmentioning

confidence: 99%

Contactless Picking of Objects Using an Acoustic Gripper

et al. 2021

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Acoustic levitation forces can be used to manipulate small objects and liquids without mechanical contact or contamination. This work presents analytical models based on which concepts for the controlled insertion of objects into the acoustic field are developed. This is essential for the use of acoustic levitators as contactless robotic grippers. Three prototypes of such grippers are implemented and used to experimentally verify the lifting of objects into an acoustic pressure field. Lifting of high-density objects (ρ > 7 g/cm3) from acoustically transparent surfaces is demonstrated using a double-sided acoustic gripper that generates standing acoustic waves with dynamically adjustable acoustic power. A combination of multiple acoustic traps is used to lift lower density objects (ρ≤0.25g/cm3) from acoustically reflective surfaces using a single-sided arrangement. Furthermore, a method that uses standing acoustic waves and thin reflectors to lift medium-density objects (ρ≤1g/cm3) from acoustically reflective surfaces is presented. The provided results open up new possibilities for using acoustic levitation in robotic grippers, which has the potential to be applied in a variety of industrial use cases.

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Section: Introductionmentioning

confidence: 99%

Contactless Picking of Objects Using an Acoustic Gripper

et al. 2021

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“…Trapping of objects by means of acoustic forces is used in various areas such as chemistry [1], bioreactors [2,3], blood analysis [4], study of organisms in microgravity [2,5], control of nano material self-assembly [6], containerless processing [7][8][9], and to study droplet dynamics [10,11]. The main advantages of acoustic levitation over other methods, such as magnetic levitation [12], are its independence of the material properties of the object and its passive stability.…”

Section: Introductionmentioning

confidence: 99%

Automated Insertion of Objects Into an Acoustic Robotic Gripper

Rothlisberger

Schuck

Kulmer

et al. 2020

The 1st International Electronic Conference on Actuator Technology: Materials, Devices and Applications

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Acoustic levitation forces can be used to manipulate small objects and liquid without mechanical contact or contamination. To use acoustic levitation for contactless robotic grippers, automated insertion of objects into the acoustic pressure field is necessary. This work presents analytical models based on which concepts for the controlled insertion of objects are developed. Two prototypes of acoustic grippers are implemented and used to experimentally verify the lifting of objects into the acoustic field. Using standing acoustic waves and by dynamically adjusting the acoustic power, the lifting of high-density objects (>7 g/cm3) from acoustically transparent surfaces is demonstrated. Moreover, a combination of different acoustic traps is used to lift lower-density objects from acoustically reflective surfaces. The provided results open up new possibilities for the implementation of acoustic levitation in robotic grippers, which have the potential to be used in a variety of industrial applications.

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“…The nonlinearity of acoustic wave propagation in liquid and gaseous media is known to generate acoustic radiation forces 1 which have been harnessed to create fluid flow 2 , microparticle manipulation in liquids 3 and to manipulate larger objects suspend in gases 4 – 6 . Using acoustic radiation forces to achieve levitation is of significant practical importance as it removes the need for the levitated object to be in contact with surfaces 7 and hence been used widely in containerless processing 8 – 10 , chemical analysis 11 , 12 , drop dynamics 13 , 14 and bioreactors 15 , 16 .…”

Section: Introductionmentioning

confidence: 99%

“…The pressure nodes correspond to minima in potential energy and are hence often referred to as potential-wells. For example, high-density media such as liquid mercury and solid iridium can be levitated 18 and high-temperature alloys can be containerlessly processed in these devices 10 . However, the acoustic field in single axis levitators produces relatively large axial acoustic radiation forces and relatively weaker lateral forces, leading to poor lateral trapping stability.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of levitated objects in acoustic vortex fields

Hong

Yin

Zhai

et al. 2017

Sci Rep

Self Cite

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Acoustic levitation in gaseous media provides a tool to process solid and liquid materials without the presence of surfaces such as container walls and hence has been used widely in chemical analysis, high-temperature processing, drop dynamics and bioreactors. To date high-density objects can only be acoustically levitated in simple standing-wave fields. Here we demonstrate the ability of a small number of peripherally placed sources to generate acoustic vortex fields and stably levitate a wide range of liquid and solid objects. The forces exerted by these acoustic vortex fields on a levitated water droplet are observed to cause a controllable deformation of the droplet and/or oscillation along the vortex axis. Orbital angular momentum transfer is also shown to rotate a levitated object rapidly and the rate of rotation can be controlled by the source amplitude. We expect this research can increase the diversity of acoustic levitation and expand the application of acoustic vortices.

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A comparison of acoustic levitation with microgravity processing for containerless solidification of ternary Al–Cu–Sn alloy

Cited by 17 publications

References 23 publications

Contactless Picking of Objects Using an Acoustic Gripper

Contactless Picking of Objects Using an Acoustic Gripper

Automated Insertion of Objects Into an Acoustic Robotic Gripper

Dynamics of levitated objects in acoustic vortex fields

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