The predicted performunce of a three-lobe journal bearing with a and slope of the coeflcients vs. Sommerfeld number match well. D k preload factor of 0.75 is compared with the measured performance. agreement in coeflcient magnitude by as much as 100% is seen at Operating eccentricity and dynamic coeflcients versus Sommerfeld high Sommerfeld numbers, although there is general agreement in the number are compared for three shaft speeds and various steady loads. trend for predicted coeflcients vs. Sommerfeld number. Numerical results are based on a model which solves the Rtynoldc equation and allows for a variety of thermal effects including cir-WORDS cumferential and mss-~ilm viscosity and temperature variation. The linearized coeflciats are experimentally determined by an average Hydrodynamic Bearings, Journal Bearings, ~u l t i -k b e magnitude and phase method using synchronous, sinusoidal exciBearings, Hydrodynamic Lubrication tations. Comparisons of journal position show good agreement (within 9.5 %) for Somme$eld numbers below 0.7 and increasing disagreement (30 % or greater) at higher Sommerfeld numbers. Agreement in journal position improves as load and shaft speed increase. At Sommerfeld numbers less than 0.4 to 0.7, agreement between the numm'cal and experimental dynamic coeflcients is very good, typically within the uncertainty of the measured data. The magnitude
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