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Nonlinear Response of Tilting Pad Journal Bearings to Harmonic Excitation

Department of Civil and Industrial Engineering, University of Pisa, Largo Lazzarino, 56122 Pisa, Italy
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This paper is an extended version of the paper published in Ciulli, E.; Forte, P. Nonlinear Effects in the Dynamic Characterization of Tilting Pad Journal Bearings. In the proceedings of the International Conference of IFToMM ITALY, Cassino, Italy, 29–30 November 2018.
Machines 2019, 7(2), 43; https://doi.org/10.3390/machines7020043
Received: 19 April 2019 / Revised: 25 May 2019 / Accepted: 14 June 2019 / Published: 17 June 2019
(This article belongs to the Special Issue Advances of Italian Machine Design)
In the experimental identification of dynamic bearing coefficients, usually small perturbations around the static equilibrium position are assumed and linear coefficients are considered. In the literature, studies on non-linear effects in plain journal bearings, especially from a numerical point of view, are reported. Few similar studies can be found on tilting pad journal bearings (TPJB). The present work reports some peculiar aspects observed during the experimental identification procedure of TPJB linear dynamic coefficients. The tests are performed on a test bench designed for large size journal bearings operating at high peripheral speeds and static loads. A quasi-static procedure is developed to quickly check the results obtained from the usually adopted dynamic excitation. It consists of applying a slowly rotating force to the floating stator and measuring the relative displacement of the stator from the rotating shaft. Different levels of static and dynamic load are applied to two different TPJBs with four and five pads. Deformed orbits have been observed increasing the ratio between dynamic load and static load, suggesting the presence of non-linearity. Similar results are obtained with simple analytical models assuming suitably tuned non-linear stiffness terms. View Full-Text
Keywords: tilting pad journal bearing; nonlinear behavior; experimental characterization tilting pad journal bearing; nonlinear behavior; experimental characterization
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Ciulli, E.; Forte, P. Nonlinear Response of Tilting Pad Journal Bearings to Harmonic Excitation. Machines 2019, 7, 43.

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