Experimental Study of Rotor-Stator Contact Cycles

E Chipato, AD Shaw, MI Friswell & RS Crespo (Swansea University)

Journal of Sound and Vibration, Vol. 502, 23 June 2021, paper 116097


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.

Paper Availability

This material has been published in the Journal of Sound and Vibration, Vol. 502, 23 June 2021, paper 116097. Unfortunately the copyright agreement with Elsevier does not allow for the PDF file of the paper to be available on this website. However the paper is available from ScienceDirect - see the link below.

Link to paper using doi: 10.1016/j.jsv.2021.116097

Journal of Sound and Vibration on ScienceDirect