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Experimental Study of Rotor-Stator Contact Cycles

Elijah Chipato, Alexander Shaw Orcid Logo, Michael Friswell, Rafael Sanchez Crespo

Journal of Sound and Vibration, Volume: 502

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

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DOI (Published version): 10.1016/j.jsv.2021.116097

Abstract

A rotor can contact a stator thereby inducing some very strong non-linearities that can result in a plethora of vibration phenomena. Synchronous motions, chaotic motion, backward whirl, forward whirl are some of the reported phenomena in the literature. This article presents an experimental approach...

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Published in: Journal of Sound and Vibration
ISSN: 0022-460X
Published: Elsevier BV 2021
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa56551
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Abstract: A rotor can contact a stator thereby inducing some very strong non-linearities that can result in a plethora of vibration phenomena. Synchronous motions, chaotic motion, backward whirl, forward whirl are some of the reported phenomena in the literature. This article presents an experimental approach based on a very flexible rotor rig designed with drill string dynamics in mind for rotordynamic experiments. A non-contact technique was used for data acquisition using a consumer-grade Go-Pro Hero 6 Black camera which captures a series of images(video) which are then post-processed using MATLAB’s image processing toolbox to understand the nature of dynamics involved. A mathematical model of the experimental rig was used for comparison with the actual experiment to assess the effectiveness of the data acquisition procedure used and validity of the model. The model is able to a good extent to reproduce the behaviour of the test rig. The fundamental phenomena exhibited by the system is analysed and discussed based on bifurcation plots, spectral intensity plots and orbit plots visualised in both rotating and stationary frame.
Keywords: Nonlinear, Rotordynamics, Periodic contacts, Backward whirl, Video
College: Faculty of Science and Engineering

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