This paper presents a novel finite element elastohydrodynamic lubrication analysis appropriate for gas journal bearings under dynamic conditions. The method employs gas pressure as a state variable, and structural sleeve deformation is represented by a linear combination of pre-selected mode shapes obtained from a related eigenvalue problem. The method takes into account temporal variation of journal position and velocity, and second-order slip flow boundary effects are included at no additional computational cost. The formulation is subsequently applied to a particular example (flexible large-aspect ratio, high-speed, MEMS-scale journal microbearing), where it is shown that a judicious choice of structural sleeve elasticity can significantly improve bearing performance (as measured by pressure distribution and load capacity) when compared with results obtained using rigid bearing surfaces.
- Tribology Division
Modal and Nodal EHD Analysis for Gas Journal Bearings
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Boedo, S, & Booker, JF. "Modal and Nodal EHD Analysis for Gas Journal Bearings." Proceedings of the ASME/STLE 2004 International Joint Tribology Conference. ASME/STLE 2004 International Joint Tribology Conference, Parts A and B. Long Beach, California, USA. October 24–27, 2004. pp. 569-579. ASME. https://doi.org/10.1115/TRIB2004-64140
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