Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
10th Edition
ISBN: 9780073398204
Author: Richard G Budynas, Keith J Nisbett
Publisher: McGraw-Hill Education
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Chapter 1, Problem 17P
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A beginner reliability engineer did not realize that the failures of the system should be grouped by type instead of having them in one group. The system was observed to fail because of two types of failures: electrical (E) and mechanical (M). The failure data for E are 316, 138, 87, 923, 921, 1113, 1152, 577, 480, 1401
The data for M are 746, 1281, 1304, 1576, 1386, 671, 2106, 660, 1149, 425
The true data for E comes from an exponential distribution with mean = 1000 h, and the data for M comes from Weibull with γ = 2 and θ = 1000.
a. What is the reliability expression for the true distribution?
b. What is the reliability expression for the combined failures?
c. Is the analysis of the engineer correct? Why?
(a) A very important component of a system has a mean time between failures of 100 hr and a mean time to repair of 10 hr. Determine the inherent availability of the system.
(b) If the equipment in Q7 (c i) above is required to meet an inherent availability requirement of 0.985 and a mean time between failures of 100 hr. Calculate the permissible mean time to repair and if the system as a mean of the time intervals between corrective maintenance actions of 900 hrs and the sum of the mean corrective maintenance time intervals including supply downtime and administrative down time of 10 hrs Determine the operational availability of the system
Q.1
a. Repeatability and reproducibility are ways of measuring precision, particularly in the field of
engineering.
i.
What is an engineer's expectation when performing repeatability or reproducibility?
ii.
State a difference between repeatability and reproducibility in an experiment?
b. Figure Q.1 shows the measurement data of two types of thermal transducers namely thermocouple.
Турe E
Туре К
6.8
4.2
20
40
60
80
100
Temperature Difference (°C)
Voltage Output (mV)
Chapter 1 Solutions
Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
Ch. 1 - Select a mechanical component from Part 3 of this...Ch. 1 - Select a mechanical component from Part 3 of this...Ch. 1 - Select an organization listed in Sec. 16, go to...Ch. 1 - Go to the Internet and connect to the NSPE website...Ch. 1 - Go to the Internet and connect to the NSPE website...Ch. 1 - Estimate how many times more expensive it is to...Ch. 1 - The costs to manufacture a part using methods A...Ch. 1 - A cylindrical part of diameter d is loaded by an...Ch. 1 - When one knows the true values x1 and x2 and has...Ch. 1 - Use the true values x1 = 7 and x2 = 8 (a)...
Ch. 1 - A solid circular rod of diameter d undergoes a...Ch. 1 - A fatigue test is performed on rotating beam...Ch. 1 - Determinations of the ultimate tensile strength...Ch. 1 - The lives of parts are often expressed as the...Ch. 1 - The tensile 0.2 percent offset yield strength of...Ch. 1 - A mechanical system comprises three subsystems in...Ch. 1 - From See. 3-12, the maximum shear stress in a...Ch. 1 - A round cold-drawn 1045 steel rod has a mean...Ch. 1 - A beam subjected to axial loading will experience...Ch. 1 - Three blocks A, B, and C and a grooved block D...Ch. 1 - The volume of a rectangular parallelepiped is...Ch. 1 - A pivot in a linkage has a pin in the figure whose...Ch. 1 - A circular cross section O ring has the dimensions...Ch. 1 - Prob. 25PCh. 1 - Prob. 26PCh. 1 - Prob. 27PCh. 1 - Prob. 28PCh. 1 - Convert the following to appropriate ips units:...Ch. 1 - Convert the following to appropriate SI units: (a)...Ch. 1 - Generally, final design results are rounded to or...Ch. 1 - Repeal Prob. 1-31 for the following: (a) = F/wt,...Ch. 1 - Repeat Prob. 131 for: (a) = F/A, where A = d2/4, F...
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