Abstract
Unbalance is the main cause of increase of time varying forces transmitted between the rotor and its frame. A flexible suspension with added damping devices is a frequently used technological solution making it possible to reduce their magnitudes. To achieve optimum performance of the damping elements, their damping effect must be controllable. This is offered by magnetorheological squeeze film dampers. Magnetorheological oils are suspensions that under influence of magnetic field behave as liquids with a yielding shear stress. This is caused by forming a chain structure of particles dispersed in carrying liquid induced by magnetic field. Even if this process is rapid, it is not instantaneous. To investigate this phenomenon and its influence on performance of the damping devices a new enhanced mathematical model of a short magnetorheological squeeze film damper has been established. The magnetorheological oil is represented by Bingham material. The steady state yielding shear stress of the magnetorheological liquid is approximated by a power function of magnetic induction. Its dependence on time is described by a differential equation of the first order. The developed mathematical model has been implemented in the computational model of a flexibly supported rigid rotor. In accordance with the theory predictions, the results of the computational simulations showed a strong influence of the delayed yielding effect on performance of the studied damping devices.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Mu C, Darling J, Burrows CR (1991) An appraisal of a proposed active squeeze film damper. ASME J Tribol 113:750–754
El-Shafei A, El-Hakim M (2000) Experimental investigation of adaptive control applied to HSFD supported rotors. ASME J Eng Gas Turbines Power 122:685–692
Tao R (2001) Super-strong magnetorheological fluids. J Phys: Condens Matter 13:R979–R999
Sahin H, Wang X, Miller M, Liu Y, Gordaninejad RF (2009) Response time of magnetorheological (MR) fluid and MR valves under various flow conditions. In: Proceedings of the ASME 2009 conference on smart materials, adaptive structures and intelligent systems. Oxnard, California, USA, pp 369–376
Goncalves FD, Carlson JD (2007) Investigating the time dependence of the MR effect. Int J Mod Phys B 21:4832–4840
Zapoměl J, Ferfecki P, Forte P (2012) A computational investigation of the transient response of an unbalanced rigid rotor flexibly supported and damped by short magnetorheological squeeze film dampers. Smart Mater Struct 21:105011
Krämer E (1993) Dynamics of rotors and foundations. Springer, Berlin
Zapoměl J, Ferfecki P (2010) A numerical procedure for investigation of efficiency of short magnetorheological dampers used for attenuation of lateral vibration of rotors passing the critical speeds. In: Proceedings of the 8th IFToMM international conference on rotordynamics. KIST, Seoul, Korea, pp 1–8
Acknowledgments
This work has been done with the research projects GACR 15-06621S, CZ.1.05/1.1.00/02.0070 and the institutional support RVO:61388998.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2015 Springer International Publishing Switzerland
About this paper
Cite this paper
Zapoměl, J., Ferfecki, P. (2015). Influence of Delayed Yielding of Magnetorheological Oils in Squeeze Film Dampers on the Vibration Attenuation of Rotors. In: Pennacchi, P. (eds) Proceedings of the 9th IFToMM International Conference on Rotor Dynamics. Mechanisms and Machine Science, vol 21. Springer, Cham. https://doi.org/10.1007/978-3-319-06590-8_83
Download citation
DOI: https://doi.org/10.1007/978-3-319-06590-8_83
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-06589-2
Online ISBN: 978-3-319-06590-8
eBook Packages: EngineeringEngineering (R0)