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Numerical and experimental investigation on dynamic performance of bump foil journal bearing based on journal orbit

Chinese journal of Aeronautics 2021年第2期34卷 586-600页

作者： Yu ZHOU Longtao SHAO Can ZHANG Fenzhu JI Jiang LIU Guo LI Shuiting DING Qi ZHANG Farong DU School of Transportation Science and Engineering Beijing Key Laboratory for High-efficient Power Transmission and System Control of New Energy Resource VehicleBeihang UniversityBeijing 100083China School of Energy ami Pow er Engineering Aircraft/Engine Integrated System Safety Beijing Key LaboratoryBeihang UniversityBeijing 100083China

Widespread usage of bump-type foil journal bearing(BFJB) in oil-free microturbomachinery requires accurate predictions of dynamic performance characteristics, although it remains a challenging issue because BFJB reflects nonlinear both structurally and *** paper presented a simple experimental method to semi-directly obtain the minimum film thickness and dynamic stiffness of BFJB using the journal orbit. Numerical calculations and simulations are conducted to validate the experimental method. The micro-deformation and interaction of various foils are taken into consideration to improve the model precision. The results from the numerical model regarding the BFJB dynamic characteristics are compared with the experimental results coming from a dedicated test rig, which shows that the experimental results fluctuate obviously and agree not well with the numerical results at the start stage due to the presence of dry friction at that time, nevertheless, they show fantastic agreement as soon as a gas film is gradually generated to separate the shaft from the top foil. Therefore, the proposed experimental method is effective to predict film thickness and dynamic characteristics during the period from the lift-off time to the land-off time. The dynamic characteristics, along with the journal orbits also can be used to rapidly predict the dynamics behavior of rotor-bearing systems.

关键词： Bump-type foil journal bearing Dynamic performance Experimental method journal orbit Numerical calculation

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