Abstract
This paper investigates a study of the simultaneous interaction between active magnetic bearing (AMB) and touchdown bearing (TDB) in an unbalanced and misaligned rotor system. Numerous practical importance of the working together of both bearings in high-speed rotating machinery, such as the turbines and pumps, can be explained by examining two cases depending upon the types of touchdown bearings. The first case is to consider a faulty rotor supported by active magnetic bearings and conventional touchdown bearings (rolling element bearings) as backup support, in which AMB is active but conventional touchdown bearing is inactive during operation. The second case is considering foil bearings as touchdown bearings, in which AMB and foil bearing both are in action during operation. The hydrodynamic principle of air in foil bearing while rotation of the rotor causes to make it in working condition. Mathematical modelling of the unbalanced and misaligned rigid rotor with a disc at middle supported on both bearings has been done for this investigation purpose. Misalignment has been considered between the rigid rotor and active magnetic bearings. The dynamic equations of motion are developed to numerically generate rotor displacement and current responses of the system. It has been found that simultaneous working of AMB and foil touchdown bearings helps in suppressing the vibration response of the rotor system, increasing the reliability of the machine and making more energy efficiently. It is also observed that current consumption is less in the second case than the first.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Tiwari R (2017) Rotor systems: analysis and identification. CRC Press, Boca Raton
Knospe CR, Hope RW, Fedigan SJ, Williams RD (1995) Experiments in the control of unbalance response using magnetic bearings. Mechatronics 5:385–400
De Queiroz M (2009) An active identification method of rotor unbalance parameters. J Vib Control 15:1365–1374
Sekhar AS, Prabhu B (1995) Effects of coupling misalignment on vibrations of rotating machinery. J Sound Vib 185:655–671
Patel TH, Darpe AK (2009) Experimental investigations on vibration response of misaligned rotors. Mech Syst Signal Process 23:2236–2252
Da Silva Tuckmantel FW, Cavalca KL (2019) Vibration signatures of a rotor-coupling-bearing system under angular misalignment. Mech Mach Theory 133:559–583
Bleuler H, Cole M, Keogh P, Larsonneur R, Maslen E, Okada Y et al (2009) Magnetic bearings: theory, design, and application to rotating machinery. Springer, Berlin, Heidelberg
Kärkkäinen A (2007) Dynamic simulations of rotors during drop on retainer bearings. In: Acta Universitatis Lappeenrantaensis
Kärkkäinen A, Helfert M, Aeschlimann B, Mikkola A (2008) Dynamic analysis of rotor system with misaligned retainer bearings. J Tribol 130:021102
San Andrés L, Kim TH (2005) Gas foil bearings: limits for high-speed operation. In: World tribology congress III, pp 71–72
Swanson E, Heshmat H (2002) Oil-free foil bearings as a reliable, high performance backup bearing for active magnetic bearings. In: ASME turbo expo 2002: power for land, sea, and air, pp 589–598
Peng JP, Carpino M (1993) Calculation of stiffness and damping coefficients for elastically supported gas foil bearings. J Tribol 115:20–27
Peng ZC, Khonsari MM (2004) Hydrodynamic analysis of compliant foil bearings with compressible air flow. J Tribol 126:542–546
Rubio D, San Andrés L (2006) Bump-type foil bearing structural stiffness: experiments and predictions. J Eng Gas Turbines Power 128:653–660
Acknowledgements
The first author acknowledges the members of Vibration Laboratory of IIT Guwahati, for their sublime support and help.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2021 Springer Nature Singapore Pte Ltd.
About this paper
Cite this paper
Kumar, P., Tiwari, R. (2021). Dynamic Response Analysis of an Unbalanced and Misaligned Rotor Supported on Active Magnetic Bearings and Touchdown Bearings. In: Rao, J.S., Arun Kumar, V., Jana, S. (eds) Proceedings of the 6th National Symposium on Rotor Dynamics. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-5701-9_33
Download citation
DOI: https://doi.org/10.1007/978-981-15-5701-9_33
Published:
Publisher Name: Springer, Singapore
Print ISBN: 978-981-15-5700-2
Online ISBN: 978-981-15-5701-9
eBook Packages: EngineeringEngineering (R0)