Bifurcations in the response of a Jeffcott rotor with rotor-to-stator rub

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

In the design of rotating machines the clearances between the rotating and stationary parts are often made smaller in order to increase their efficiency. Although the smaller clearance provides an advantage from the performance point of view, it is however not the case when viewed from the dynamics perspective as the possibility of rotor-to-stator rub to occur increases significantly. Rubbing in rotating machines is a highly nonlinear phenomenon and therefore it is very important to understand its dynamics. In this work the bifurcations in the response of a Jeffcott rotor subjected to rotor-to-stator rub is numerically investigated. In particular the influence of the rotor imbalance, contact stiffness and friction coefficient on the response of the rotor is examined for a range of operating speed. For the range of parameters investigated in this work, numerical results revealed the occurrence of sub-synchronous, quasi-periodic and chaotic vibrations in the response of the rotor. The range of operating speed where sub-synchronous and non-synchronous vibrations were found in the rotor's response was seen to increase as a result of increasing the magnitudes of the rotor imbalance and contact stiffness. The response of the rotor was generally found to be invariant to the variation of the friction coefficient magnitude except for the combination of the largest values of rotor eccentricity and contact stiffness, whereby the range of sub-synchronous and non-synchronous vibrations was observed to increase as the magnitude of the friction coefficient became larger. For these particular magnitudes of rotor eccentricity and contact stiffness, the rotor response exhibited hysteresis phenomena resulting in the presence of multiple attractors for the same set of parameter values.

Original languageEnglish
Title of host publicationASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010
Pages409-418
Number of pages10
DOIs
Publication statusPublished - 01 Dec 2010
EventASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010 - Istanbul, Turkey
Duration: 12 Jul 201014 Jul 2010

Publication series

NameASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010
Volume4

Other

OtherASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010
CountryTurkey
CityIstanbul
Period12/07/1014/07/10

Fingerprint

Stators
Rotors
Stiffness
Friction
Hysteresis

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Inayat Hussain, J. I. (2010). Bifurcations in the response of a Jeffcott rotor with rotor-to-stator rub. In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010 (pp. 409-418). (ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010; Vol. 4). https://doi.org/10.1115/ESDA2010-24453
Inayat Hussain, Jawaid Iqbal. / Bifurcations in the response of a Jeffcott rotor with rotor-to-stator rub. ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010. 2010. pp. 409-418 (ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010).
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abstract = "In the design of rotating machines the clearances between the rotating and stationary parts are often made smaller in order to increase their efficiency. Although the smaller clearance provides an advantage from the performance point of view, it is however not the case when viewed from the dynamics perspective as the possibility of rotor-to-stator rub to occur increases significantly. Rubbing in rotating machines is a highly nonlinear phenomenon and therefore it is very important to understand its dynamics. In this work the bifurcations in the response of a Jeffcott rotor subjected to rotor-to-stator rub is numerically investigated. In particular the influence of the rotor imbalance, contact stiffness and friction coefficient on the response of the rotor is examined for a range of operating speed. For the range of parameters investigated in this work, numerical results revealed the occurrence of sub-synchronous, quasi-periodic and chaotic vibrations in the response of the rotor. The range of operating speed where sub-synchronous and non-synchronous vibrations were found in the rotor's response was seen to increase as a result of increasing the magnitudes of the rotor imbalance and contact stiffness. The response of the rotor was generally found to be invariant to the variation of the friction coefficient magnitude except for the combination of the largest values of rotor eccentricity and contact stiffness, whereby the range of sub-synchronous and non-synchronous vibrations was observed to increase as the magnitude of the friction coefficient became larger. For these particular magnitudes of rotor eccentricity and contact stiffness, the rotor response exhibited hysteresis phenomena resulting in the presence of multiple attractors for the same set of parameter values.",
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Inayat Hussain, JI 2010, Bifurcations in the response of a Jeffcott rotor with rotor-to-stator rub. in ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010. ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010, vol. 4, pp. 409-418, ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010, Istanbul, Turkey, 12/07/10. https://doi.org/10.1115/ESDA2010-24453

Bifurcations in the response of a Jeffcott rotor with rotor-to-stator rub. / Inayat Hussain, Jawaid Iqbal.

ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010. 2010. p. 409-418 (ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010; Vol. 4).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Inayat Hussain JI. Bifurcations in the response of a Jeffcott rotor with rotor-to-stator rub. In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010. 2010. p. 409-418. (ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010). https://doi.org/10.1115/ESDA2010-24453