A1 Journal article (refereed), original research

Performance evaluation of touchdown bearing using model-based approach

Open Access hybrid publication

Publication Details
Authors: Neisi Neda, Heikkinen Janne, Sillanpää Teemu, Hartikainen Toni, Sopanen Jussi
Publisher: Springer Verlag (Germany)
Publication year: 2020
Language: English
Related Journal or Series Information: Nonlinear Dynamics
ISSN: 0924-090X
eISSN: 1573-269X
JUFO-Level of this publication: 2
Open Access: Open Access hybrid publication


In the active magnetic bearings (AMBs)supported rotating machinery,
touchdown bearings are considered as safety devices to support the rotor
in the deficiency of electromagnetic field. Generally, the industrial AMB
machines do not have force sensorsfor touchdown bearings and the system
is only equipped with the position sensors to monitor the rotor displacement that disables the opportunity to measure the forces during dropdown events that might be destructive for the safe operation of the rotor system. This study explores the relative severity of dropdowns that are evaluated from a computational motor model using the rotor displacement data recorded from the position sensors installed in the machine as an input. The model for double-row angular contact ball bearing type touchdown bearings is integrated with the rotor model. The simulation model is verified by comparing the simulated rotor orbits against measured orbits at four different dropdowns. The Fast Fourier transform (FFT) is used to observe the studied dropdown events in
frequency domain revealing from the rotor response the following details:
harmonics of the operation speed, rub-impact frequencies, pendulum motion of the rotor and the first two bending frequencies of the rotor settled on the touchdown bearings. The critical speed map also verifies the bending frequencies and identified support properties. The model-based
approach can be used to evaluate and compare a single dropdown event with respect to previous events providing an insight for decision making whether touchdown bearing should be replaced.

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Last updated on 2020-04-11 at 12:04

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