Numerical Investigation of Rotors in Floating Ring Bearings using Co-Simulation
Seiten
2019
Technische Universität Darmstadt FB Mechanik, Bibliothek (Verlag)
978-3-935868-48-8 (ISBN)
Technische Universität Darmstadt FB Mechanik, Bibliothek (Verlag)
978-3-935868-48-8 (ISBN)
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The nonlinear oscillation behavior of rotors in floating ring bearings is investigated numerically by means of transient run-up simulations. A mass-conserving cavitation model based on two-phase theory is employed. Special axial boundary conditions are introduced, which better reflect open-ended bearings. The rotor and bearing models are implemented in commercial software tools and coupled using a co-simulation coupling method, which enables the creation of detailed, easily interchangeable and updateable subsystems.
Simulations are performed using a symmetric Jeffcott rotor and an asymmetric, heavy turbocharger. The differences between classical non-mass-conserving and the mass-conserving two-phase cavitation model are small for purely synchronous oscillations. The pressure build-up is delayed for the two-phase model during radial squeeze motion of the journal, which decreases the damping of the bearings. This entails a lower stability threshold rotor speed of the subsynchronous whirls and may also yield higher journal eccentricities.
Simulations are performed using a symmetric Jeffcott rotor and an asymmetric, heavy turbocharger. The differences between classical non-mass-conserving and the mass-conserving two-phase cavitation model are small for purely synchronous oscillations. The pressure build-up is delayed for the two-phase model during radial squeeze motion of the journal, which decreases the damping of the bearings. This entails a lower stability threshold rotor speed of the subsynchronous whirls and may also yield higher journal eccentricities.
| Erscheinungsdatum | 22.12.2018 |
|---|---|
| Reihe/Serie | Forschungsberichte des Instituts für Mechanik der Technischen Universität Darmstadt ; 48 |
| Zusatzinfo | Abbildungen inkl. Tabellen |
| Sprache | englisch |
| Maße | 150 x 210 mm |
| Gewicht | 222 g |
| Einbandart | Paperback |
| Themenwelt | Naturwissenschaften ► Physik / Astronomie ► Mechanik |
| Schlagworte | Cavitation • heavy turbocharger • JeffCoff roter • transient run-up simulation • two-phase theory |
| ISBN-10 | 3-935868-48-0 / 3935868480 |
| ISBN-13 | 978-3-935868-48-8 / 9783935868488 |
| Zustand | Neuware |
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