A touchdown bearing with surface waviness: A dynamic model using a multibody approach

作者：Halminen Oskari^*; Aceituno Javier F; Escalona Jose L; Sopanen Jussi; Mikkola Aki

来源：Proceedings of the Institution of Mechanical Engineers - Part K: Journal of Multi-body Dynamics , 2017, 231(4): 658-669.

DOI：10.1177/1464419317689946

• Multibody model
• elastic method
• touchdown bearing
• waviness
• orbits
• fast Fourier transform

The amount of vibration induced by surface waviness in a touchdown bearing can be modelled with a multibody approach. This study develops a multibody model that accounts for surface waviness in races of touchdown bearings and employs the model to define the dissimilarities of the rotor and inner ring movements, and to perform inner ring velocity analysis in the frequency domain. Model results are compared with measured and simulated outcomes in the literature. Large movements are found in the orbits and velocities in the frequency domain due to surface waviness. Inner race eccentricity and ellipticity seem to be the cause of the most damaging surface waviness. In the frequency domain, all the significant peaks were noticed to be multiplications of rotor pendulum frequency, and the frequency of the inner ring was traceable in cases with waviness in the bearing. The model proposed in this study enables waviness to be taken into account in design of touchdown bearings.

• 出版日期2017-12