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Nonlinear rotordynamics of a MDOF rotor–stator contact system subjected to frictional and gravitational effects
Mechanical Systems and Signal Processing, Volume: 159, Start page: 107776
Swansea University Authors: Elijah Chipato, Alexander Shaw , Michael Friswell
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DOI (Published version): 10.1016/j.ymssp.2021.107776
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...
Published in: | Mechanical Systems and Signal Processing |
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ISSN: | 0888-3270 |
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Elsevier BV
2021
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URI: | https://cronfa.swan.ac.uk/Record/cronfa56689 |
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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 |
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Mechanical Systems and Signal Processing |
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107776 |
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10.1016/j.ymssp.2021.107776 |
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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 |
2021-10-01T04:11:50Z |
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1763753811172655104 |
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11.030737 |