# A journal bearing 4 inches in diameter and 4 inches long has a radial clearance of...

###### Question:

A journal bearing 4 inches in diameter and 4 inches long has a radial clearance of 0.002 inches. It rotates at 2000 rpm and is lubricated is SAE 10 oil at 200F. In the following, use an applied load of 225 lbs and neglect temperature rise.

a. Estimate the power loss and the friction torque using the Petrov equation. Calculate the coefficient of friction.
b. Calculate the minimum clearance, the power loss, friction torque and the coefficient of friction using the charts in section 12-8 of the text.

Figures in section 12-8:

I/d=00 (dimensionless) Minimum film thickness variable Eccentricity ratio e (dimensionless) 1.0 10 0.01 0.02 0.04 0.06 0.08 0.1 0.2 0.4 0.6 0.8 1.0 6 8 Bearing characteristic number, S=0 " Figure 12-15 Chart for minimum film thickness variable and eccentricity ratio. (Source: A A. Raimondi and John Boyd, “A Solution for the Finite Journal Bearing and Its Application to Analysis and Design, Parts I, II, and III," Trans. ASLE. vol. 1, no. 1, in Lubrication Science and Technology, Pergamon, New York, 1958, pp. 159-209.)
Page 642 (deg) Position of minimum film thickness 0.01 0.02 0.04 0.06 0.1 0.2 0.4 0.6 0.81.0 2 4 6 8 10 Bearing characteristic number, S=2 4 Figure 12-16 Chart for determining the position of the minimum film thickness ho. (Source: A A. Raimondi and John Boyd, “A Solution for the Finite Journal Bearing and Its Application to Analysis and Design, Parts I, II, and III,” Trans. ASLE. vol. 1, no. 1, in Lubrication Science and Technology, Pergamon, New York, 1958, pp. 159-209.)
f (dimensionless) X Coefficient-of-friction variable 0.01 0.02 0.04 0.06 0.1 0.2 0.4 0.6 0.8 1.0 2 4 6 8 10 Bearing characteristic number, S- Figure 12-17 Chart for coefficient-of-friction variable; note that Petroff's equation is the asymptote. (Source: A A. Raimondi and John Boyd, “A Solution for the Finite Journal Bearing and Its Application to Analysis and Design, Parts I, II, and III," Trans. ASLE. vol. 1, no. 1, in Lubrication Science and Technology, Pergamon, New York, 1958, pp. 159–209.)
Page 643 dimensionless) Flow variable 0.01 0.02 0.04 0.06 0.1 0.2 0.4 0.6 0.8 1.0 2 4 6 8 10 Bearing characteristic number, S = (5) N Figure 12-18 Chart for total flow variable. Note: Not for pressure-fed bearings. (Source: A A. Raimondi and John Boyd, "A Solution for the Finite Journal Bearing and Its Application to Analysis and Design, Parts I, II, and III," Trans. ASLE. vol. 1, no. 1, in Lubrication Science and Technology, Pergamon, New York, 1958, pp. 159-209.) d=114 How ratio 1/d=00 0 0.01 0.02 0.04 0.06 0.1 0.2 0.4 0.6 1.0 2 4 6 8 10 Bearing characteristic number, S=( Figure 12-19 Chart for determining the ratio of side flow to total flow. (Source: A A. Raimondi and John Boyd, "A Solution for the Finite Journal Bearing and Its Application to Analysis and Design, Parts I, II, and III," Trans. ASLE. vol. 1, no. 1, in Lubrication Science and Technology, Pergamon, New York, 1958, pp. 159-209.)
Page 644 Maximum-film-pressure ratio proposis) 0 0.01 0.02 0.04 0.06 0.1 0.2 0.4 0.6 0.8 1.0 2 4 6 8 10 Bearing characteristic number, S- Figure 12-20 Chart for determining the maximum film pressure. Note: Not for pressure-fed bearings. (Source: A A. Raimondi and John Boud. "A Solution for the finite Journal Bearing and Its Application to Analysis and Design, Parts I, II, and III," Trans. ASLE. vol. 1, no. 1, in Lubrication Science and Technology, Pergamon, New York, 1958, pp. 159-209.)
(deg) , (deg) Terminating position of film Position of maximum film pressure 10 0.01 0.02 0.04 0.06 0.08 0.1 0.2 0.4 0.6 0.8 10 4 6 8 Bearing characteristic number, S= 2 . Figure 12-21 Chart for finding the terminating position of the lubricant film and the position of maximum film pressure. (Source: A A. Raimondi and John Boyd, "A Solution for the Finite Journal Bearing and Its Application to Analysis and Design. Parts I, II and III," Trans. ASLE. vol. 1, 110.1, in Lubrication Science and Technology, Pergamon, New York, 1958, pp. 159-209.)

#### Similar Solved Questions

##### 2. Joe Smith, a 67-year-old man, is admitted with the diagnosis of adenocarcinoma of the penis....
2. Joe Smith, a 67-year-old man, is admitted with the diagnosis of adenocarcinoma of the penis. He presents with painless wartlike growth on the skin of the glans of the penis. (Learning Objective #7) Explain the pathophysiology of cancer of the penis. What are the early and late manifestations of c...
##### Which precursors can be used to make glucose in gluconeogenesis? amino acids, pyruvate, lactic acid, and...
Which precursors can be used to make glucose in gluconeogenesis? amino acids, pyruvate, lactic acid, and fatty acids b. amino acids, pyruvate, and fatty acids amino acids, pyruvate, lactic acid, and glycerol d. pyruvate, lactic acid, glycerol, and fatty acids & a. C. is the biosynthetic pathway ...
##### How to calculate r_over-bar for a semicylindrical shell?
"Specify the x- and z- coordinates of the center of mass of the semicylindrical shell."I understand how to find the x- coordinate and understand the idea behind getting the z- coordinate however I want to know how to find the values of the componentsof the z- coordinate.Ex.: The z- coordinat...
##### Provide the reactant that would give the following adol condensation Eco What is the major organic...
Provide the reactant that would give the following adol condensation Eco What is the major organic product ILDA loch Lock3 Ph OcH3 2) H₃ ot...
##### You are given four capacitors of capacitance 1?F each. How many different effective capacitors can you...
You are given four capacitors of capacitance 1?F each. How many different effective capacitors can you make with them, using one, two, three, or all four in different configurations (in series and/or in parallel), and what are their capacitances?...
##### Find the impulse response of the system shown in Figure 1. Assume that h(n) = h...
Find the impulse response of the system shown in Figure 1. Assume that h(n) = h (n) = /1n un) h3(n) = u(n) 11n haln) = (3) "un) mon) - mm hi(n) h2(n) x(n) y(n) ☺ - Helm von h₃ (n) han) Figure 1. The system....
##### An auto insurance company wants to know the proportion of drivers who always buckle their seat belts when driving. They...
An auto insurance company wants to know the proportion of drivers who always buckle their seat belts when driving. They randomly survey 400 drivers and find that 320 always buckle up. What is the 99% confidence interval for the population proportion of drivers who always buckle their seat belt? Roun...