Abstract
Ball bearings are commonly used in high speed turbomachinery and have a critical influence on the rotordynamic behavior. Therefore, a simulation model of the bearing to predict the dynamic influence is essential. The presented model is a further step to develop an accurate and efficient characterization of the ball bearing’s rotor dynamic parameters such as stiffness and deflections as well as vibrational excitations induced by the discrete rolling elements. To make it applicable to high speed turbomachinery, the model considers centrifugal forces, gyroscopic effects and ball spinning. The consideration of an elastic outer ring makes the bearing model suitable for integrated lightweight bearing constructions used in modern aircraft turbines. In order to include transient rotordynamic behavior, the model is built as a full dynamic multibody simulation with time integration. To investigate the influence of the elasticity of the outer ring, a comparison with a rigid formulation for several rotational speeds and loads is presented.
Highlights
Used in common machinery, rolling element bearings permit a rotational motion between two components
A precise bearing model is essential for the following two reasons: first, it allows the calculation of typical rotordynamic coefficients like speed and load-dependent stiffness
Due to the large number of elastic degrees of freedom, the full finite element model can hardly be handled in a dynamic multibody simulation
Summary
Used in common machinery, rolling element bearings permit a rotational motion between two components. A precise bearing model is essential for the following two reasons: first, it allows the calculation of typical rotordynamic coefficients like speed and load-dependent stiffness. These parameters are important for the determination of the rotor’s critical speeds as well as for the definition of the operational ranges. A damaged bearing with faults at the raceways or the balls generates additional system excitations in frequency ranges, which can be calculated in the dynamic simulation. In high speed lightweight applications such as turbopumps or compressors, angular contact ball bearings are used. They are axially preloaded to avoid clearance
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
