
Thinking Like an Engineer
4th Edition
ISBN: 9781269910989
Author: Elizabeth A. Stephan, David R. Bowman, William J. Park, Benjamin L. Sill, Matthew W. Ohland
Publisher: Pearson Learning Solutions
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Textbook Question
Chapter 17, Problem 2ICA
Without running these code segments in MATLAB, what will be the value stored in the specified variable after executing each program?
- a. What is stored in Dogs?
clear
clc
Greyhounds = 30;
G_Cost = 250;
Dalmatians = 10;
D_Cost = 150;
Dogs = Greyhounds * G_Cost + Dalmatians * D_Cost;
- b. What is stored in w?
clear
clc
X = 2;
y = 4;
z = 2;
W = (Y + Z/X + Z^1/2)
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5. The figure shows a gear train. There is no friction at the bearings except for the gear tooth forces.
The material of the milled gears is steel having a Brinell hardness of 170. The input shaft speed (n2)
is 800 rpm. The face width and the contact angle for all gears are 1 in and 20° respectively. In this
gear set, the endurance limit (Se) is 15 kpsi and nd (design factor) is 2.
(a) Find the revolution speed of gear 5.
(b) Determine whether each gear satisfies the design factor of 2.0 for bending fatigue.
(c) Determine whether each gear satisfies the design factor of 2.0 for surface fatigue (contact stress).
(d) According to the computation results of the questions (b) and (c), explain the possible failure
mechanisms for each gear.
N4=28
800rpm
N₁=43
N5=34
N₂=14
P(diameteral pitch)=8 for all gears
Coupled to 2.5hp motor
1. The rotating steel shaft is simply supported by bearings at points of B and C, and is driven by a spur
gear at D, which has a 6-in pitch diameter. The force F from the drive gear acts at a pressure angle of
20°. The shaft transmits a torque to point A of TA =3000 lbĘ in. The shaft is machined from steel with
Sy=60kpsi and Sut=80 kpsi.
(1) Draw a shear force diagram and a bending moment diagram by F. According to your analysis, where is
the point of interest to evaluate the safety factor among A, B, C, and D? Describe the reason. (Hint: To find
F, the torque Tд is generated by the tangential force of F (i.e. Ftangential-Fcos20°)
When n=2.5, K=1.8, and K₁ =1.3, determine the diameter of the shaft based on
(2) static analysis using DE theory (note that fatigue stress concentration factors need to be used for this
question because the loading condition is fatigue) and
(3) a fatigue analysis using modified Goodman.
Note) A standard diameter is not required for the questions.
10 in
D
3
N2=28
P(diametral pitch)=8 for all gears
Coupled to 25 hp motor
N3=34
Full depth spur gears with pressure angle=20°
N₂=2000 rpm
(1) Compute the circular pitch, the center-to-center distance, and base circle radii.
(2) Draw the free body diagram of gear 3 and show all the forces and the torque.
(3) In mounting gears, the center-to-center distance was reduced by 0.1 inch.
Calculate the new values of center-to-center distance, pressure angle, base circle radii,
and pitch circle diameters.
(4)What is the new tangential and radial forces for gear 3?
(5) Under the new center to center distance, is the contact ratio (mc) increasing or
decreasing?
Chapter 17 Solutions
Thinking Like an Engineer
Ch. 17.1 - Prob. 1CCCh. 17.2 - What is the output when you pass in the value 10...Ch. 17.2 - Write a function named RAC that will accept two...Ch. 17 - Which of the following are not valid...Ch. 17 - Without running these code segments in MATLAB,...Ch. 17 - Prob. 3ICACh. 17 - ICA 17-4
Write a program to store the following...Ch. 17 - Write a MATLAB program to evaluate the following...Ch. 17 - Write a MATLAB program to evaluate the following...Ch. 17 - Write a MATLAB program to evaluate the following...
Ch. 17 - Prob. 8ICACh. 17 - Prob. 9ICACh. 17 - The Shockley diode equation gives the relationship...Ch. 17 - For each MATLAB code segment shown, write the...Ch. 17 - Prob. 12ICACh. 17 - A member of your team gives you the following...Ch. 17 - Prob. 14ICACh. 17 - Consider the following MATLAB program and...Ch. 17 - A novice MATLAB user created the following code...Ch. 17 - The specific gravity of gold is 19.3. Write a...Ch. 17 - An unmanned X-43A scramjet test vehicle has...Ch. 17 - A rod on the surface of Jupiters moon Callisto has...Ch. 17 - The Eco-Marathon is an annual competition...Ch. 17 - Write a program to determine the mass of oxygen...Ch. 17 - Write a program to convert a temperature provided...Ch. 17 - Write a program to determine how long, in units of...Ch. 17 - A cylindrical tank filled to a height of 25 feet...Ch. 17 - Write a MATLAB program that implements the...Ch. 17 - Write a MATLAB program that implements the...Ch. 17 - The specific gravity of gold is 19.3. Write a...Ch. 17 - An unmanned X-43A scramjet test vehicle has...Ch. 17 - Prob. 13RQCh. 17 - A cylindrical tank filled to a height of 25 feet...Ch. 17 - Write a function that implements the quadratic...Ch. 17 - Write a function that implements the Pythagorean...Ch. 17 - As part of a team investigating the effect of mass...Ch. 17 - We have made many measurements of coffee cooling...Ch. 17 - In a factory, various metal pieces are forged and...Ch. 17 - Prob. 21RQCh. 17 - Prob. 22RQCh. 17 - You have been assigned to a new project at work....Ch. 17 - You have been assigned to a new project at work....Ch. 17 - You have been assigned to a new project at work....
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