Indian Journal of Engineering & Materials Sciences

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A Comparative Study of the Dynamic Stability of a Rotor Supported by an Air-Bearing and an Air-ring Bearing


Affiliations
1 Department of Mechanical Engineering, PSN College of Engineering and Technology, Tirunelveli 627 152, India
 

An exploration to justify the need for an air-ring around an air-bearing is done by comparing the dynamic stability plots of a rotor supported by air-bearings with and without an air-ring. Air-bearing with air-ring or air-ring bearing has pocketed feed-holes. The air-bearing without air-ring has plain feed-holes and it is referred to as air-bearing with a direct feeding system. A linearized free-vibration model rotor-bearing is used to analyze the dynamic stability. The dynamic coefficients of air-bearing with a direct feeding system and air-ring bearing are affected by whirl frequency due to the fluid compressibility effects. The stability threshold speed of the rotor air-ring bearing system is increased well above the threshold speed of the rotor air-bearing with a direct feeding system. The rotor critical mass of the rotor air-ring bearing system is smaller than that of the rotor air-bearing with a direct feeding system. The air-ring of air-ring bearing can prevent self-excited vibration in lightly loaded rotor-bearing systems.

Keywords

Dynamic coefficients, Gas-lubricated, Hydrostatic journal bearing, Self-excited vibration, Stability threshold speed.
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  • Pan C H T & Sternlicht B, Trans ASME J Basic Eng, 84 (1962) 152.

  • Gross W A, Trans ASME J Basic Eng, 84 (1962) 132.

  • Lund J W, Trans ASME J Appl Mech, 32 (1965) 911.

  • Chu T Y, McCabe J T & Elrod H G, Trans ASME J Lubr Technol, 90 (1968) 162.

  • Powell J W & Tempest M C, Trans ASME J Lubr Technol, 90 (1968) 701.

  • Fuller D D, Trans ASME J Lubr Technol, 91 (1969) 1.

  • Marsh H, Trans ASME J Lubr Technol, 91 (1969) 113.

  • Majumdar B C, Tribol Int, 8 (1975) 127.

  • Guha S K, Rao N S & Majumdar B C, Trans ASME J Tribol, 110 (1988) 139.

  • Otsu Y, Somaya K & Yoshimoto S, Tribol Int, 44 (2011) 9.

  • Bonello P & Pham H, Nonlinear dynamic analysis of a turbocharger on foil-air bearings with focus on stability and self-excited vibration (Proceedings of the ASME Turbo Expo: Power for Land, Sea, and Air: Turbine Technical Conference and Exposition, Dusseldorf, Germany), 2014, V07BT32A003.

  • Arghir M, Hassini M A, Balducchi F & Gauthier R, Trans ASME J Eng Gas Turbines Power, 138 (2016) 021602.

  • Xiao H, Li W, Zhou Z, Huang X & Ren Y, Tribol Int, 120 (2018) 476.

  • Gao Q, Chen W, Lu L, Huo D & Cheng K, Tribol Int, 135 (2019) 1.

  • Zeise P & Schweizer B, J Sound Vib, 521 (2022) 116392.

  • Brzeski L & Kazimierski Z, Trans ASME J Lubr Technol, 101 (1979) 520.

  • Kazimierski Z & Trojnarski J, Trans ASME J Lubr Technol, 102 (1980) 59.

  • Czołczyński K, Brzeski L & Kazimierski Z, Wear, 167 (1993) 49.

  • Czołczyński K, Wear, 201 (1996) 265.

  • Czołczyński K, Kapitaniak T & Marynowski K, Wear, 199 (1996) 100.

  • Czołczyński K, Wear, 210 (1997) 220.

  • Czołczyński K, Rotor dynamics of gas-lubricated journal bearing systems, (Springer-Verlag, New York) 1999.

  • Muthanandam M, Ramamurthy S & Nadarajan S, Design of air bearing for high speed micro gas turbine (Proceedings of the 5th National Seminar and Exhibition on Aerospace and related Mechanisms, ISRO Satellite Centre, Bangalore, India), 2005, 269.

  • Muthanandam M, Thyageswaran S, Aswin V & Rajakumaran T, Analysis of load-carrying abilities in rotor-bearing systems, paper presented at 13th International Conference on Vibration Problems, Indian Institute of Technology, Guwahati, India, 2017.

  • Muthanandam M & Thyageswaran S, J Vib Eng Technol, 9 (2021) 1.

  • https://ntrs.nasa.gov/api/citations/19780010517/downloads/19780010517.pdf (21 May 2021).

  • Al-Bender F, Colombo F, Reynaerts D, Villavicencio R & Waumans T, Adv Tribol, 2017 (2017) 1.

  • Muthanandam M, Self-excited vibration analysis of a rotor air-ring bearing via a two-degrees of freedom approach. Ph.D. Thesis, Anna University, Chennai, 2021.

  • Khonsari M M & Booser R E, Applied tribology, bearing design, and lubrication, (John Wiley and Sons, New York) 2001.

  • http://repository.tamu.edu/handle/1969.1/93197 (26 August 2015).


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  • A Comparative Study of the Dynamic Stability of a Rotor Supported by an Air-Bearing and an Air-ring Bearing

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Authors

Muruganandam Muthanandam
Department of Mechanical Engineering, PSN College of Engineering and Technology, Tirunelveli 627 152, India

Abstract


An exploration to justify the need for an air-ring around an air-bearing is done by comparing the dynamic stability plots of a rotor supported by air-bearings with and without an air-ring. Air-bearing with air-ring or air-ring bearing has pocketed feed-holes. The air-bearing without air-ring has plain feed-holes and it is referred to as air-bearing with a direct feeding system. A linearized free-vibration model rotor-bearing is used to analyze the dynamic stability. The dynamic coefficients of air-bearing with a direct feeding system and air-ring bearing are affected by whirl frequency due to the fluid compressibility effects. The stability threshold speed of the rotor air-ring bearing system is increased well above the threshold speed of the rotor air-bearing with a direct feeding system. The rotor critical mass of the rotor air-ring bearing system is smaller than that of the rotor air-bearing with a direct feeding system. The air-ring of air-ring bearing can prevent self-excited vibration in lightly loaded rotor-bearing systems.

Keywords


Dynamic coefficients, Gas-lubricated, Hydrostatic journal bearing, Self-excited vibration, Stability threshold speed.

References