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Volume 1 Issue 3
Dec.  2019
Article Contents

Shi M H, Feng K, Hu J H, Zhu J, Cui H L. Near-field acoustic levitation and applications to bearings: a critical review. Int. J. Extrem. Manuf. 1, 032002 (2019).
Citation: Shi M H, Feng K, Hu J H, Zhu J, Cui H L. Near-field acoustic levitation and applications to bearings: a critical review. Int. J. Extrem. Manuf. 1, 032002 (2019).

Near-field acoustic levitation and applications to bearings: a critical review


doi: 10.1088/2631-7990/ab3e54
More Information
  • Publish Date: 2019-12-07
  • The importance to industry of non-contact bearings is growing rapidly as the demand for high-speed and high-precision manufacturing equipment increases. As a recently developed non-contact technology, near-field acoustic levitation (NFAL) has drawn much attention for the advantages it offers, including no requirement for an external pressurized air supply, its compact structure, and its ability to adapt to its environment. In this paper, the working mechanism of NFAL is introduced in detail and compared to all existing non-contact technologies to demonstrate its versatility and potential for practical applications in industry. The fundamental theory of NFAL, including gas film lubrication theory and acoustic radiation pressure theory is presented. Then, the current state-of-the-art of the design and development of squeeze film air bearings (SFABs) based on NFAL is reviewed. Finally, future trends and obstacles to more widespread use are discussed.
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Near-field acoustic levitation and applications to bearings: a critical review

doi: 10.1088/2631-7990/ab3e54
  • 1 State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, People’s Republic of China;
  • 2 State Key Lab of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People’s Republic of China;
  • 3 Department of Mechanical Engineering, Tokyo Institute of Technology, Japan;
  • 4 Institute of Machinery Manufacturing Technology, China Academy of Engineering Physics, Mianyang, 621000, People’s Republic of China

Abstract: 

The importance to industry of non-contact bearings is growing rapidly as the demand for high-speed and high-precision manufacturing equipment increases. As a recently developed non-contact technology, near-field acoustic levitation (NFAL) has drawn much attention for the advantages it offers, including no requirement for an external pressurized air supply, its compact structure, and its ability to adapt to its environment. In this paper, the working mechanism of NFAL is introduced in detail and compared to all existing non-contact technologies to demonstrate its versatility and potential for practical applications in industry. The fundamental theory of NFAL, including gas film lubrication theory and acoustic radiation pressure theory is presented. Then, the current state-of-the-art of the design and development of squeeze film air bearings (SFABs) based on NFAL is reviewed. Finally, future trends and obstacles to more widespread use are discussed.

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