Evaluation of Static and Dynamic Characteristics of Bump Metal Mesh Foil Bearing

Gas foil bearings, which are oil-free and exhibit low energy losses, are used in high-speed rotating machinery. Because gas is used as the working fluid, there is a need to improve damping performance using support structures. Additionally, the support structure, which becomes increasingly complex s...

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Bibliographic Details
Published in:Tribology Online 2024/07/07, Vol.19(4), pp.345-351
Main Authors: Kuwata, Yuki, Ochiai, Masayuki
Format: Article
Language:English
Subjects:
bump foil
damping
Dynamic characteristics
Foil bearings
gas foil bearing
High speed
journal bearing
metal mesh
Performance evaluation
Rotating fluids
Rotating machinery
Static characteristics
Static loads
vibration characteristics
Vibration control
Vibration damping
Vibration measurement
Working fluids
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Summary:Gas foil bearings, which are oil-free and exhibit low energy losses, are used in high-speed rotating machinery. Because gas is used as the working fluid, there is a need to improve damping performance using support structures. Additionally, the support structure, which becomes increasingly complex shaft performance, needs to be simplified. This study proposes a new bump mesh foil bearing focusing on the support structure and experimentally verifies its static and dynamic characteristics. The bump metal mesh foil bearing is a simple structure that combines a bump shape and metal mesh. Static load and hammering tests were conducted to evaluate the static characteristics, and the frictional torque and vibration at high-speed rotation were measured to evaluate the dynamic characteristics. The bump metal mesh foil bearing exhibited excellent damping performance owing to the friction damping caused by the bump shape and metal mesh; however, the rigidity of the bump metal mesh foil bearing was reduced. The bump metal mesh foil bearing exhibited the same level of lifting performance as the bump foil bearing, and vibration reduction at high-speed rotation was confirmed. Thus, the combination of the bump foil and metal mesh bearings yielded good results in terms of vibration characteristics.
ISSN:1881-2198
1881-218X
1881-2198
DOI:10.2474/trol.19.345