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Dynamic Stiffness And Damping Characteristics Of A High-temperature Air Foil Journal Bearing

by Nasa Technical Reports Server (ntrs)

2021-01-13 21:11:38

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Using a high-temperature optically based displacement measurement system, a foil air bearing's stiffness and damping characteristics were experimentally determined. Results were obtained over a range of modified Sommerfeld Number from 1.5E6 to 1.5E7,... Read more
Using a high-temperature optically based displacement measurement system, a foil air bearing's stiffness and damping characteristics were experimentally determined. Results were obtained over a range of modified Sommerfeld Number from 1.5E6 to 1.5E7, and at temperatures from 25 to 538 C. An Experimental procedure was developed comparing the error in two curve fitting functions to reveal different modes of physical behavior throughout the operating domain. The maximum change in dimensionless stiffness was 3.0E-2 to 6.5E-2 over the Sommerfeld Number range tested. Stiffness decreased with temperature by as much as a factor of two from 25 to 538 C. Dimensionless damping was a stronger function of Sommerfeld Number ranging from 20 to 300. The temperature effect on damping being more qualitative, showed the damping mechanism shifted from viscous type damping to frictional type as temperature increased. Less

Book Details

File size9.69 X 7.44 X 0.05 in
Print pages26
PublisherBiblioGov
Publication date August 7, 2013
LanguageEnglish
ISBN9781289288853
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Nasa Technical Reports Server (ntrs)
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