Operations and Supply Chain Management, 9th Edition WileyPLUS Registration Card + Loose-leaf Print Companion
9th Edition
ISBN: 9781119371618
Author: Roberta S. Russell
Publisher: Wiley (WileyPLUS Products)
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Question
Chapter 4, Problem 9P
a)
Summary Introduction
To determine: Calculate the reliability of each system. Which system would you recommend?
b)
Summary Introduction
To determine: Each system described above can also be purchased in a Plus configuration, where each component has an identical backup, for double the original cost. Which system would you recommend now?
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Rick Wing, salesperson for Wave SolderingSystems, Inc. (WSSI), has provided you with a proposal forimproving the temperature control on your present machine.The machine uses a hot-air knife to cleanly remove excess solder from printed circuit boards; this is a great concept, butthe hot-air temperature control lacks reliability. According toWing, engineers at WSSI have improved the reliability of thecritical temperature controls. The new system still has the foursensitive integrated circuits controlling the temperature, butthe new machine has a backup for each. The four integratedcircuits have reliabilities of .90, .92, .94, and .96. The fourbackup circuits all have a reliability of .90.a) What is the reliability of the new temperature controller?b) If you pay a premium, Wing says he can improve all fourof the backup units to .93. What is the reliability of thisoption?
A floor cleaning robot contains 4 modules that are critical to its operation.
The modules and their individual reliabilities are listed below.
Movement module
0.98
Data Storage Module
0.999
Learning Module
0.99
Vision Module
0.94
What is the probability that the system will be up and running?
Suppose this number is too low and it is desired to improve the reliability
through redundant elements.
What would be the new reliability from each one of these changes?
a. back up the Vision module with an identical module.
b. back up the movement module with an identical module, but not the vision module.
Rick Wing, salesperson for Wave Soldering Systems, Inc. (WSSI), has provided you with a proposal for improving the temperature control on your present machine. The machine uses a hot-air knife to cleanly remove excess solder from printed circuit boards; this is a great concept, but the hot-air temperature control lacks reliability. According to Wing, engineers at WSSI have improved the reliability of the critical temperature controls. The new system still has the four sensitive integrated circuits controlling the temperature, but the new machine has a backup for each. The four integrated circuits have reliabilities of
0.840.84,
0.860.86,
0.880.88,
and
0.900.90.
The four backup circuits all have a reliability of
0.840.84.
Part 2
a) The overall reliability of the new temperature controller =
92.2592.25%
(enter your response as a percentage rounded to two decimal places).
Part 3
b) If you pay a premium, Wing says he can improve all four of the backup units to
0.870.87.…
Chapter 4 Solutions
Operations and Supply Chain Management, 9th Edition WileyPLUS Registration Card + Loose-leaf Print Companion
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