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Nonlinear rotordynamics of a MDOF rotor–stator contact system subjected to frictional and gravitational effects

Elijah Chipato, Alexander Shaw Orcid Logo, Michael Friswell

Mechanical Systems and Signal Processing, Volume: 159, Start page: 107776

Swansea University Authors: Elijah Chipato, Alexander Shaw Orcid Logo, Michael Friswell

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Abstract

Rotating machines are intrinsically susceptible to expensive and high-risk faults such as rotor–stator rub. During a rub event normal and tangential forces are generated by the contact and friction that cause wear at the contacting interfaces. In the present work, such forces are computed by assumin...

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Published in: Mechanical Systems and Signal Processing
ISSN: 0888-3270
Published: Elsevier BV 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa56689
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spelling 2021-05-21T12:14:28.4310500 v2 56689 2021-04-19 Nonlinear rotordynamics of a MDOF rotor–stator contact system subjected to frictional and gravitational effects e94c235327abd4da98a6407a1d924ad8 Elijah Chipato Elijah Chipato true false 10cb5f545bc146fba9a542a1d85f2dea 0000-0002-7521-827X Alexander Shaw Alexander Shaw true false 5894777b8f9c6e64bde3568d68078d40 Michael Friswell Michael Friswell true false 2021-04-19 FGSEN Rotating machines are intrinsically susceptible to expensive and high-risk faults such as rotor–stator rub. During a rub event normal and tangential forces are generated by the contact and friction that cause wear at the contacting interfaces. In the present work, such forces are computed by assuming linear elastic contact and Coulomb friction at multiple interface locations. A finite element shaft-line model of a horizontally mounted rotor is used to demonstrate the approach and the model is reduced for computational efficiency. The modal assurance criterion is used to identify the linear modes that contribute to a given solution. It is observed that bouncing solutions exist with rotor–stator contact in complex machines that can be viewed as internal resonances involving a small number of modes. The responses can become complex because different modes can combine to give the internal resonance (and hence a larger range of frequency ratios) and because of asymmetries, such as gravity. One design goal is to avoid any contact in the system and the analysis in this paper identifies the conditions for internal resonance that should be avoided in a real machine. The complicated dynamics shown here reveal some of the distinct features of contacting solutions and could also be used in condition monitoring to characterise faults. Journal Article Mechanical Systems and Signal Processing 159 107776 Elsevier BV 0888-3270 Friction, Gravity, Internal resonance, Backward whirl, Modal assurance criterion 1 10 2021 2021-10-01 10.1016/j.ymssp.2021.107776 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2021-05-21T12:14:28.4310500 2021-04-19T12:08:07.2430976 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Elijah Chipato 1 Alexander Shaw 0000-0002-7521-827X 2 Michael Friswell 3 56689__19723__3d63e3e102a94ae3a0cdcad9fa95a422.pdf 56689(2).pdf 2021-04-21T09:14:31.9251265 Output 8129913 application/pdf Accepted Manuscript true 2022-03-25T00:00:00.0000000 ©2021 All rights reserved. All article content, except where otherwise noted, is licensed under a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND) true eng http://creativecommons.org/licenses/by-nc-nd/4.0/
title Nonlinear rotordynamics of a MDOF rotor–stator contact system subjected to frictional and gravitational effects
spellingShingle Nonlinear rotordynamics of a MDOF rotor–stator contact system subjected to frictional and gravitational effects
Elijah Chipato
Alexander Shaw
Michael Friswell
title_short Nonlinear rotordynamics of a MDOF rotor–stator contact system subjected to frictional and gravitational effects
title_full Nonlinear rotordynamics of a MDOF rotor–stator contact system subjected to frictional and gravitational effects
title_fullStr Nonlinear rotordynamics of a MDOF rotor–stator contact system subjected to frictional and gravitational effects
title_full_unstemmed Nonlinear rotordynamics of a MDOF rotor–stator contact system subjected to frictional and gravitational effects
title_sort Nonlinear rotordynamics of a MDOF rotor–stator contact system subjected to frictional and gravitational effects
author_id_str_mv e94c235327abd4da98a6407a1d924ad8
10cb5f545bc146fba9a542a1d85f2dea
5894777b8f9c6e64bde3568d68078d40
author_id_fullname_str_mv e94c235327abd4da98a6407a1d924ad8_***_Elijah Chipato
10cb5f545bc146fba9a542a1d85f2dea_***_Alexander Shaw
5894777b8f9c6e64bde3568d68078d40_***_Michael Friswell
author Elijah Chipato
Alexander Shaw
Michael Friswell
author2 Elijah Chipato
Alexander Shaw
Michael Friswell
format Journal article
container_title Mechanical Systems and Signal Processing
container_volume 159
container_start_page 107776
publishDate 2021
institution Swansea University
issn 0888-3270
doi_str_mv 10.1016/j.ymssp.2021.107776
publisher Elsevier BV
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description Rotating machines are intrinsically susceptible to expensive and high-risk faults such as rotor–stator rub. During a rub event normal and tangential forces are generated by the contact and friction that cause wear at the contacting interfaces. In the present work, such forces are computed by assuming linear elastic contact and Coulomb friction at multiple interface locations. A finite element shaft-line model of a horizontally mounted rotor is used to demonstrate the approach and the model is reduced for computational efficiency. The modal assurance criterion is used to identify the linear modes that contribute to a given solution. It is observed that bouncing solutions exist with rotor–stator contact in complex machines that can be viewed as internal resonances involving a small number of modes. The responses can become complex because different modes can combine to give the internal resonance (and hence a larger range of frequency ratios) and because of asymmetries, such as gravity. One design goal is to avoid any contact in the system and the analysis in this paper identifies the conditions for internal resonance that should be avoided in a real machine. The complicated dynamics shown here reveal some of the distinct features of contacting solutions and could also be used in condition monitoring to characterise faults.
published_date 2021-10-01T04:08:11Z
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