Comparison of the steady-state and dynamic performance of two fixed-geometry journal bearings

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Proceedings titleProceedings of the ASME Turbo Expo
ConferenceASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011, 6 June 2011 through 10 June 2011, Vancouver, BC
Pages685694; # of pages: 10
SubjectCylindrical bore; Dynamic coefficient; Dynamic performance; Dynamic property; Excitation frequency; Mass-spring-damper system; Operating condition; Operating temperature; Plain journal bearings; Power-losses; Rotational speed; Rotor dynamic coefficients; Specific loads; Steady state performance; Aspect ratio; Exhibitions; Frequency domain analysis; Journal bearings; Shaft displacement; Turbines; Landforms
AbstractThis paper evaluates two different journal bearings: a cylindrical bore plain journal bearing and a tri-lobe taper land bearing. Each bearing has the same nominal diameter (89 mm) and aspect ratio (L/D = 0.7). The shaft rotational speed ranged from 6krpm to 14krpm and the bearing specific load from 700kPa to 2800kPa. The bearings' steady-state performance is evaluated according to relative bearing and shaft displacement, bearing operating temperature and power loss. A frequency-domain analysis is used to determine bearing rotordynamic coefficients - it treats the bearing as a mass-spring-damper system. Excitation frequencies range between 20Hz and 350Hz. Ultimately, the tri-lobe taper land bearing offers better stability whereas the cylindrical bore plain journal bearing has a lower eccentricity and runs cooler for a given operating condition. The dynamic properties of the two bearings are found to be similar, although the higher stability of the tri-lobe taper land bearing is also reflected in the dynamic coefficients. Copyright © 2011 by ASME.
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AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21271611
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Record identifier3d595460-ed00-47df-8849-13ac617412e5
Record created2014-03-24
Record modified2016-05-09
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