QU The journal speed of a 100mm diameter journal is 2500 rpm. The journal is supported by a short hydrodynamic bearing of length L = 0.6D, eccentricity ratio = 0.75 and a clearance ratio C/R = 0.001. The radial load on the bearing is 10 kN. The lubricant is SAE 30, and the operating temperature of the lubricant in the bearing is 700C. 1- Assume infinitely-short-bearing theory, find the min. and max. oil film thickness. 2- Derive the equation for the pressure wave around the bearing, at the center of the width (y=0). 3- Find the attitude angle, friction torque, and the friction power losses.
QU The journal speed of a 100mm diameter journal is 2500 rpm. The journal is supported by a short hydrodynamic bearing of length L = 0.6D, eccentricity ratio = 0.75 and a clearance ratio C/R = 0.001. The radial load on the bearing is 10 kN. The lubricant is SAE 30, and the operating temperature of the lubricant in the bearing is 700C. 1- Assume infinitely-short-bearing theory, find the min. and max. oil film thickness. 2- Derive the equation for the pressure wave around the bearing, at the center of the width (y=0). 3- Find the attitude angle, friction torque, and the friction power losses.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:QU The journal speed of a 100mm diameter journal is 2500 rpm. The journal is supported by
a short hydrodynamic bearing of length L 0.6D, eccentricity ratio &= 0. 75 and a clearance
ratio C/R = 0.001. The radial load on the bearing is 10 kN. The lubricant is SAE 30, and the
operating temperature of the lubricant in the bearing is 700C.
1- Assume infinitely-short-bearing theory, find the min. and max. oil film thickness.
2- Derive the equation for the pressure wave around the bearing, at the center of the width
(y-0).
3- Find the attitude angle, friction torque, and the friction power losses.
10
10
10L
80
Temperature T, (°C)
30
40
50
60
70
90
100
Viscosity u Ns/m
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