0
Research Papers: Hydrodynamic Lubrication

Acoustic Journal Bearing With Changeable Geometry and Built-in Flexibility

[+] Author and Article Information
T. A. Stolarski

Department of Mechanical
and Aerospace Engineering,
Brunel University London,
Kingston Lane,
Uxbridge UB8 3PH, Middlesex, UK
e-mail: mesttas@brunel.ac.uk

M. Miyatake

Department of Mechanical Engineering,
Tokyo University of Science,
6-3-1, Niijuku, Katsushika-ku,
Tokyo 125-8585, Japan
e-mail: m-miyatake@rs.tus.ac.jp

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received February 11, 2018; final manuscript received May 21, 2018; published online July 12, 2018. Assoc. Editor: Stephen Boedo.

J. Tribol 140(6), 061707 (Jul 12, 2018) (9 pages) Paper No: TRIB-18-1066; doi: 10.1115/1.4040416 History: Received February 11, 2018; Revised May 21, 2018

The influence of embodiment flexibility on the performance of an acoustic journal bearing is presented. Two completely different embodiments of the bearing were investigated using three criteria of performance assessment that is torque at the start-up, amount of separation due to squeeze film pressure, and motion stability of the shaft running at speed. The embodiment with built-in flexibility proved to perform far better than the bearing for which overall flexibility was much less. However, considerations pertinent to the easy of machining and fatigue endurance mitigate the ranking of performance of the two embodiments investigated.

Copyright © 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Wardle, F. , 2015, Ultra-Precision Bearings, Woodhead Publishing, London.
Mizumoto, H. , Arii, S. , Yabuta, Y. , Kami, Y. , and Tazoe, Y. , 2007, “ Active Aerostatic Bearings for Ultraprecision Applications,” 35th International MATADOR Conference, Taipei, Taiwan, pp. 289–292.
Matsumura, F. , Okada, Y. , Fujita, M. , and Namerikawa, T. , 1997, “ State of the Art of Magnetic Bearings: Overview of Magnetic Bearing Research and Applications,” JSME Int. J Ser. C, 40(4), pp. 553–560. [CrossRef]
Langois, W. , 1962, “ Isothermal Squeeze Films,” Q. Appl. Math., 20(2), pp. 131–150. [CrossRef]
Hashimoto, Y. , Yoshikazu, K. , and Sadayuki, U. , 1998, “ Transporting Objects Without Contact Using Flexural Traveling Waves,” J. Acoust. Soc. Am., 103(6), pp. 3230–3233. [CrossRef]
Matsuo, E. , 2000, “ Holding Characteristics of Planar Objects Suspended by Near-Field Acoustic Levitation,” Ultrasonics, 38(1–8), pp. 60–63. [CrossRef] [PubMed]
Ueha, S. , Yoshiki, H. , and K. Yoshikazu, K. , 2000, “ Non-Contact Transportation Using Near-Field Acoustic Levitation,” Ultrasonics, 38(1–8), pp. 26–32. [CrossRef] [PubMed]
Minikes, A. , and Izhak, B. , 2003, “ Coupled Dynamics of a Squeeze-Film Levitated Mass and a Vibrating Piezoelectric Disc: Numerical Analysis and Experimental Study,” J. Sound Vib., 263(2), pp. 241–268. [CrossRef]
Nomura, H. , and Kamakura, T. , 2002, “ Theoretical and Experimental Examination of Near-Field Acoustic Levitation,” J. Acoust. Soc. Am., 111(4), pp. 1578–1584. [CrossRef] [PubMed]
Hu, J. , Li, G. , Chan, H. L. W. , and Choy, C. L. , 2001, “ A Standing Wave-Type Noncontact Linear Ultrasonic Motor,” IEEE Trans. Ultrason., Ferroelectr., Freq. Control, 48(3), pp. 699–708. [CrossRef]
Foresti, D. , Nabavi, M. , Klingauf, M. , Ferrari, A. , and Poulikakos, D. , 2013, “ Acoustophoretic Contactless Transport and Handling of Matter in Air,” Proc. Natl. Acad. Sci. U. S. A., 110(31), pp. 12549–12554. [CrossRef] [PubMed]
Stolarski, T. A. , and Woolliscroft, C. , 2007, “ Use of Near-Field Acoustic Levitation in Experimental Sliding Contact,” ASME J. Appl. Mech., 74(4), pp. 816–820. [CrossRef]
Wang, Y. Z. , and Wei, B. , 2013, “ Mixed-Modal Disk Gas Squeeze Film Theoretical and Experimental Analysis,” Int. J. Mod. Phys., B, 27(25), pp. 1–20.
Ilssar, D. , Bucher, I. , and Cohen, N. , 2014, “ Structural Optimization for One Dimensional Acoustic Levitation Devices—Numerical and Experimental Study,” International Conference on Noise Vibration Engineering (ISMA), Leuven, Belgium, Sept. 15–17, pp. 317–329. http://past.isma-isaac.be/downloads/isma2014/papers/isma2014_0073.pdf
Ilssar, D. , and Bucher, I. , 2015, “ On the Slow Dynamics of Near-Field Acoustically Levitated Objects Under High Excitation Frequencies,” J. Sound Vib., 354, pp. 154–166. [CrossRef]
Chang, X. , Wei, B. , Atherton, M. , Mares, C. , Stolarski, T. A. , and Almurshedi, A. , 2016, “ NFAL Prototype Design and Feasibility Analysis for Self-Levitated Conveying,” Tribol. Trans., 59(5), pp. 957–968. [CrossRef]
Wei, B. , Shaham, R. , and Bucher, I. , 2018, “ Theoretical Investigation and Prototype Design for Non-Parallel Squeeze Film Movement Platform Driven by Standing Waves,” Tribol. Int., 119, pp. 539–548. [CrossRef]
Stolarski, T. A. , and Chai, W. , 2006, “ Load-Carrying Capacity Generation in Squeeze Film Action,” Int. J. Mech. Sci., 48(7), pp. 736–741. [CrossRef]

Figures

Grahic Jump Location
Fig. 1

Essence of the squeeze film mechanism

Grahic Jump Location
Fig. 2

Schematic showing geometry of elastically deformed bearing

Grahic Jump Location
Fig. 3

Bearing in deformed state. (1) housing, (2) bearing shell, (3) PZT, and (4) oscillating “half-moon” gap.

Grahic Jump Location
Fig. 4

Diagram of bearing system for its analytical model

Grahic Jump Location
Fig. 5

Photograph showing the first embodiment of the bearing: (1) PZT (there are three PZTs spaced by 120 deg); (2) supporting and constraining arm fixing the bearing to its housing; and (3) inner surface of the bearing shell

Grahic Jump Location
Fig. 6

Image of the bearing (first embodiment) showing its deformation when applied offset voltage to PZTs was 60 V

Grahic Jump Location
Fig. 7

Photograph of the bearing in its second embodiment: (1) “elastic hinge”; (2) inner surface; (3) outer surface totally constrained in the housing; and (4) slot for PZT

Grahic Jump Location
Fig. 8

Image of the bearing (second embodiment) showing its deformation when applied offset voltage to PZTs was 95 V

Grahic Jump Location
Fig. 9

(a) Schematic of experimental apparatus; (b) photograph showing experimental setup; (c) photographs showing top part of the apparatus: PZTs (rod type), shaft, and tested bearing are all visible; and (d) photograph showing aerostatic thrust bearing of the apparatus together with displacement probes to monitor shaft's motion

Grahic Jump Location
Fig. 10

Schematic illustrating orientation of X and Y axes relative to the position of PZTs. The load on the bearing acts along y-axis that is between two adjacent PZTs.

Grahic Jump Location
Fig. 11

Separation of the shaft from inner bearing surface as a function of applied load: series 1, calculated separation for the second embodiment; series 2, calculated separation for the first embodiment; series 3, measured separation for the first embodiment; series 4, measured separation for the second embodiment

Grahic Jump Location
Fig. 12

Torque required to start-up motion of the shaft for different loads (first embodiment)

Grahic Jump Location
Fig. 13

Torque required to start-up motion of the shaft for different loads (second embodiment)

Grahic Jump Location
Fig. 14

Change in the magnitude of stability coefficient, S, as a function of load on the bearing in its first embodiment

Grahic Jump Location
Fig. 15

Change in the magnitude of stability coefficient, S, as a function of load on the bearing in its second embodiment

Tables

Errata

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In