Dynamic stability of rotating systems in turbomachinery under API standards

• Autorzy: Kozanecki Zbigniew , Tkacz Eliza , Łagodziński Jakub , Gizelska Małgorzata
• Języki publikacji: EN

Abstrakty

EN

The stability of rotating systems in turbomachinery has to account for the structure design, the actual geometry of bearings and all of the remaining forces, including operational data as well as temperature of the bearing lubricating oil. Thus, a study of the dynamic stability of rotating machines is complex and time consuming in terms of modelling and calculations. Even though it is recognized that other methods of analysis and acceptance criteria have been used to evaluate stability, API standardization procedures ensure appropriate notification and participation in the development process. According to these procedures, firstly we prepare a rotor technical documentation based on geometry measurements, frequently with optical scanning. Secondly, a theoretical analysis consisting of calculations with the finite element method based on the program that allows us to build a numerical model of rotor dynamics, is carried out. Then, the so-called “bump test” is performed to measure natural frequencies of a freely suspended rotor, which makes it possible to “tune” the theoretical model, making it compatible with the real object not only in terms of geometric dimensions and mass, but also from the point of view of the form and frequency of free vibrations. Thus, we obtain an experimentally verified numerical model which can be used for future machine diagnostics and other needs.

Słowa kluczowe

EN

turbomachinery; rotating system stability; model tuning; API standards

PL

maszyny przepływowe; stabilność układu wirującego; strojenie modelu

• Wydawca: Poznan University of Technology. Institute of Applied Mechanics
• Czasopismo: Vibrations in Physical Systems
• Rocznik: 2019
• Tom: Vol. 30, nr 2
• Strony: art. no. 2019202
• Opis fizyczny: Bibliogr. 7 poz., 1 fot. kolor., rys., 1 wykr.

Twórcy

autor

Kozanecki Zbigniew

• Lodz University of Technology, 90-924 Łódź, 219/223 Wólczańska Street

autor

Tkacz Eliza

• Lodz University of Technology, 90-924 Łódź, 219/223 Wólczańska Street

autor

Łagodziński Jakub

• Lodz University of Technology, 90-924 Łódź, 219/223 Wólczańska Street

autor

Gizelska Małgorzata

• Lodz University of Technology, 90-924 Łódź, 219/223 Wólczańska Street

Bibliografia

• 1. D. W. Childs, Dynamic Analysis of Turbulent Annular Seals Based on Hirs Lubrication Equation, J. of Lubr. Techn., 105 (1983) 429 - 436.
• 2. W. J. Chen, E. J. Gunter, Introduction to Dynamics of Rotor-Bearing Systems, Trafford Publishing, Eigen Technologies Inc., 2005.
• 3. D. Kozanecka, Dynamics of the Flexible Rotor with an Additional Active Magnetic Bearing, Machine Dyn. Probl., 25(2) (2001) 21 - 38.
• 4. Z. Kozanecki, Rotating Systems of the Low and Medium Power Turbomachinery (in Polish), ITE Publishing House, 2008, ISBN 978-83-7204-693-2.
• 5. Z. Kozanecki et al., Application of Active Magnetic Bearings for Identification of the Force Generated in the Labyrinth Seal, Journal of Theoretical and Applied. Mech., 45(1) (2007) 53 - 60K.
• 6. API Standard 617, Axial and Centrifugal Compressors and Expander-compressors - eighth edition, September 2014, errata 1, August 2016.
• 7. API Standard 684, Tutorial on the API Standard Paragraphs Covering Rotor Dynamics and Balancing: An Introduction to Lateral Critical and Train Torsional Analysis and Rotor Balancing.

Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).