Improving stability and operation of turbine rotors using adjustable journal bearings.
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| Title: | Improving stability and operation of turbine rotors using adjustable journal bearings. |
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| Authors: | Chasalevris, Athanasios1 athanasios.chasalevris@ge.com, Dohnal, Fadi2 fadi.dohnal@gmx.at |
| Source: | Tribology International. Dec2016, Vol. 104, p369-382. 14p. |
| Subjects: | Turbine blades, Rotors, Journal bearings, Stability (Mechanics), Stiffness (Mechanics), Damping (Mechanics) |
| Abstract: | A theoretical study on the application of parametric excitation through fluid film journal bearings in order to extend the stability margins is presented in this paper. The proposed 2-arc and 3-arc journal bearing configurations are able to provide periodical stiffness and damping variation in certain frequency and amplitude introducing parametric anti-resonances or resonances in the system, leading to stable or unstable operation respectively. Furthermore, the use of the proposed bearings as a mean for real time adjustment of the journal center and the shaft-line is highlighted for further investigation. The theoretical application of the proposed bearings to a medium size industrial steam turbine of higher speed demonstrates the extension of stability margins at rotating speeds even five times supercritical. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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