Thinking Like an Engineer: An Active Learning Approach (3rd Edition)
3rd Edition
ISBN: 9780133593211
Author: Elizabeth A. Stephan, David R. Bowman, William J. Park, Benjamin L. Sill, Matthew W. Ohland
Publisher: PEARSON
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Textbook Question
Chapter 16.7, Problem 15CC
Create a structure array named Resistors containing data on three resistors, including fields for Value, Power, Composition, and Tolerance. The three resistors should have the following specifications (enter numeric values only for Value, Power, and Tolerance, not the units):
• 100,000 ohms, ¼ watt, Metal Film, 0.1%
• 2,200,000 ohms, ½ watt, Carbon, 5%
• 15 ohms, 50 watts, Wire Wound, 10%
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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?
2. A flat belt drive consists of two 4-ft diameter cast-iron pulleys spaced 16 ft apart.
A power of 60 hp is transmitted by a pulley whose speed is 380 rev/min. Use a
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belt is 6 in. Use CD=1. Answer the following questions.
(1) What is the total length of the belt according to the given geometry?
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(4) Using the allowable tension, find the force (F₁) on the tight side. What is the
tension at the loose side (F2) and the initial tension (F.)?
(5) Using the forces, estimate the developed friction coefficient (f)
(6) Based on the forces and the given rotational speed, rate the pulley set. In other
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Chapter 16 Solutions
Thinking Like an Engineer: An Active Learning Approach (3rd Edition)
Ch. 16.1 - Prob. 1CCCh. 16.1 - Which of the following assignment statements are...Ch. 16.2 - Write MATLAB code to complete the following...Ch. 16.2 - Prob. 4CCCh. 16.3 - Each problem should be done with a single MATLAB...Ch. 16.3 - Assume a row vector named vals has already been...Ch. 16.3 - Comprehension Check 15-1 0 a. Assume you have four...Ch. 16.3 - a. Write a single MATLAB command that will create...Ch. 16.4 - a. Create the matrix CCM1=[180.34.11017] using a...Ch. 16.4 - Prob. 10CC
Ch. 16.5 - a. Create a variable named MTS containing the text...Ch. 16.6 - Assume a cell array named CA has three cells in a...Ch. 16.6 - Prob. 14CCCh. 16.7 - Create a structure array named Resistors...Ch. 16.7 - Use the data stored in MetalData to answer the...Ch. 16.8 - a. Store all workspace variables in the file...Ch. 16 - Which of the following are not valid MATLAB...Ch. 16 - Prob. 2ICACh. 16 - Write the MATLAB code necessary to create the...Ch. 16 - Assuming t = [9 10; 11 12] and v = [2 4;6 8;10 12]...Ch. 16 - Prob. 5ICACh. 16 - For each of the following problems, write a single...Ch. 16 - For each of the following problems, write a single...Ch. 16 - Prob. 9ICACh. 16 - Assume four row vectors named Prod10, Prod11,...Ch. 16 - Assume a matrix named Prod contains data on...Ch. 16 - Prob. 5RQCh. 16 - Refer to the specifications for Review Questions...
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- The tooth numbers for the gear train illustrated are N₂ = 24, N3 = 18, №4 = 30, №6 = 36, and N₁ = 54. Gear 7 is fixed. If shaft b is turned through 5 revolutions, how many turns will shaft a make? a 5 [6] barrow_forwardCE-112 please solve this problem step by step and give me the correct answerarrow_forwardCE-112 please solve this problem step by step and give me the correct answerarrow_forward
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