Experimental characterisation of asynchronous partially contacting motion in a multiple-degree-of-freedom rotor system

Crespo, Rafael Sanchez; Shaw, Alexander; Friswell, Michael; Champneys, Alan R.

doi:10.1016/j.ymssp.2020.106904

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Experimental characterisation of asynchronous partially contacting motion in a multiple-degree-of-freedom rotor system

Rafael Sanchez Crespo, Alexander Shaw

, Michael Friswell, Alan R. Champneys

Mechanical Systems and Signal Processing, Volume: 145, Start page: 106904

Swansea University Authors: Rafael Sanchez Crespo, Alexander Shaw , Michael Friswell

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DOI (Published version): 10.1016/j.ymssp.2020.106904

Abstract

Recent theory has predicted the onset of asynchronous bouncing motion at speeds beyond those of internal resonance in multi-degree-of-freedom rotating systems with intermittent contact. This paper provides the first attempt to experimentally validate the theory. Vibrations incorporating rotor-stator...

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Published in:	Mechanical Systems and Signal Processing
ISSN:	0888-3270
Published:	Elsevier BV 2020
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URI:	https://cronfa.swan.ac.uk/Record/cronfa54129
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first_indexed	2020-05-05T19:33:50Z
last_indexed	2020-10-21T03:05:59Z
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spelling	2020-10-20T11:19:42.3510469 v2 54129 2020-05-05 Experimental characterisation of asynchronous partially contacting motion in a multiple-degree-of-freedom rotor system c09e4d32161ca5f2ad60bce7f18efb6c Rafael Sanchez Crespo Rafael Sanchez Crespo true false 10cb5f545bc146fba9a542a1d85f2dea 0000-0002-7521-827X Alexander Shaw Alexander Shaw true false 5894777b8f9c6e64bde3568d68078d40 Michael Friswell Michael Friswell true false 2020-05-05 EEN Recent theory has predicted the onset of asynchronous bouncing motion at speeds beyond those of internal resonance in multi-degree-of-freedom rotating systems with intermittent contact. This paper provides the first attempt to experimentally validate the theory. Vibrations incorporating rotor-stator contact are recorded from a vertically ounted rotordynamics test rig comprising two rigid shaft-disk assemblies that are axially joined by a bellows coupling. The upper rotor has an elastic bearing whereas the lower one is free but has a snubber ring located on its lower shaft, with clearance about 2.5% of the entire system’s length. Nonlinear vibrations are excited by a small measured eccentricity of about 20% of the clearance. Measurements are taken by a wireless accelerometer and processed to produce an experimental bifurcation diagram, for small steps in the rotor speed, allowing the transients to decay. Evidence is found of bistability between quiescent and violent motion over a wide range of rotational speeds, including those representing both fundamental and internal resonances. The results are shown to qualitatively match numerical simulations from a differential equation model that incorporates rigid impacts. Journal Article Mechanical Systems and Signal Processing 145 106904 Elsevier BV 0888-3270 Rotordynamics, Nonlinear dynamics, Experimental testing, Internal resonance, Rotor-stator impact, Asynchronous bouncing motion 1 11 2020 2020-11-01 10.1016/j.ymssp.2020.106904 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University UKRI, EP/K003836/2 2020-10-20T11:19:42.3510469 2020-05-05T15:32:57.8978904 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Rafael Sanchez Crespo 1 Alexander Shaw 0000-0002-7521-827X 2 Michael Friswell 3 Alan R. Champneys 4 54129__17190__30bea461b3124e76bc66a74bb59914ab.pdf 54129.pdf 2020-05-05T15:35:36.0019104 Output 5127413 application/pdf Version of Record true Copyright 2020 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license. true eng http://creativecommons.org/licenses/by/4.0/
title	Experimental characterisation of asynchronous partially contacting motion in a multiple-degree-of-freedom rotor system
spellingShingle	Experimental characterisation of asynchronous partially contacting motion in a multiple-degree-of-freedom rotor system Rafael Sanchez Crespo Alexander Shaw Michael Friswell
title_short	Experimental characterisation of asynchronous partially contacting motion in a multiple-degree-of-freedom rotor system
title_full	Experimental characterisation of asynchronous partially contacting motion in a multiple-degree-of-freedom rotor system
title_fullStr	Experimental characterisation of asynchronous partially contacting motion in a multiple-degree-of-freedom rotor system
title_full_unstemmed	Experimental characterisation of asynchronous partially contacting motion in a multiple-degree-of-freedom rotor system
title_sort	Experimental characterisation of asynchronous partially contacting motion in a multiple-degree-of-freedom rotor system
author_id_str_mv	c09e4d32161ca5f2ad60bce7f18efb6c 10cb5f545bc146fba9a542a1d85f2dea 5894777b8f9c6e64bde3568d68078d40
author_id_fullname_str_mv	c09e4d32161ca5f2ad60bce7f18efb6c_*_Rafael Sanchez Crespo 10cb5f545bc146fba9a542a1d85f2dea__Alexander Shaw 5894777b8f9c6e64bde3568d68078d40_**_Michael Friswell
author	Rafael Sanchez Crespo Alexander Shaw Michael Friswell
author2	Rafael Sanchez Crespo Alexander Shaw Michael Friswell Alan R. Champneys
format	Journal article
container_title	Mechanical Systems and Signal Processing
container_volume	145
container_start_page	106904
publishDate	2020
institution	Swansea University
issn	0888-3270
doi_str_mv	10.1016/j.ymssp.2020.106904
publisher	Elsevier BV
college_str	Faculty of Science and Engineering
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hierarchy_top_title	Faculty of Science and Engineering
hierarchy_parent_id	facultyofscienceandengineering
hierarchy_parent_title	Faculty of Science and Engineering
department_str	School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
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description	Recent theory has predicted the onset of asynchronous bouncing motion at speeds beyond those of internal resonance in multi-degree-of-freedom rotating systems with intermittent contact. This paper provides the first attempt to experimentally validate the theory. Vibrations incorporating rotor-stator contact are recorded from a vertically ounted rotordynamics test rig comprising two rigid shaft-disk assemblies that are axially joined by a bellows coupling. The upper rotor has an elastic bearing whereas the lower one is free but has a snubber ring located on its lower shaft, with clearance about 2.5% of the entire system’s length. Nonlinear vibrations are excited by a small measured eccentricity of about 20% of the clearance. Measurements are taken by a wireless accelerometer and processed to produce an experimental bifurcation diagram, for small steps in the rotor speed, allowing the transients to decay. Evidence is found of bistability between quiescent and violent motion over a wide range of rotational speeds, including those representing both fundamental and internal resonances. The results are shown to qualitatively match numerical simulations from a differential equation model that incorporates rigid impacts.
published_date	2020-11-01T04:07:28Z
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score	11.016593

Experimental characterisation of asynchronous partially contacting motion in a multiple-degree-of-freedom rotor system

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