ENGINEERING DESIGN PROCESS
3rd Edition
ISBN: 9781305253285
Author: HAIK
Publisher: CENGAGE L
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Textbook Question
Chapter 7.9, Problem 1P
A set of measurable parameters with values specific to the product that together define the product is called the specifications. These parameters are either physical properties of the product or the capabilities of the product. Log on to the Internet to extract the specifications of a product and to identify these two classes of specifications.
Expert Solution & Answer
To determine
The specifications of a product and to identify the two classes of specifications
Explanation of Solution
Product Specification is a document which provides critical defining information about a product and it includes the identification of the manufacturer. The designer of the product should take care that the product meets its specifications. Product specification contains a product identification and detailed description of the product.
Physical properties of the product includes the study of matter
Example-absorption, area, brittleness of material, etc.
Product capability is the output of the product which is needed by the customer.
The two classes of specification are as follows.
1. Prescriptive specification-This type of specification deals with the clauses for the methods of construction. Most of the projects are a part of prescriptive specification.
2. Performance specification -This type of specification deals with the product performance and for how long the product is good to go. It covers all the performance characteristics of the product.
Product specification sheet is as follows.
Product-PU001MONO
GTIN-6754231541
Gross width-
Gross depth-
Net weight-
Type of Material-Rock metal
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Sometimes equations can be developed and practical problems solved by knowing nothing more than the dimensions of
the key parameters. For example, consider the heat loss through a window in a building. Window efficiency is rated in
terms of R value, which has the unit of ft2-hr-F/Btu. A certain manufacturer offers a double-pane window with R=2.5 and
also a triple-pane window with R=3.4. Both windows are 3.5 ft by 5 ft. On a given winter day, the temperature difference
between the inside and outside is 45°F.
Assume that a homeowner buys 20 such triple-pane windows for the house. A typical winter equals about 120 heating days at AT =
45°F. Each triple-pane window costs $85 more than a double-pane window. Ignoring interest and inflation, how many years will it take
the homeowner to make up the additional cost of the triple-pane windows from heating bill savings?
9.5 years
S
MacBook Air
!
You are a biomedical engineer working for a small orthopaedic firm that fabricates rectangular shaped fracture
fixation plates from titanium alloy (model = "Ti Fix-It") materials. A recent clinical report documents some problems with the plates
implanted into fractured limbs. Specifically, some plates have become permanently bent while patients are in rehab and doing partial
weight bearing activities.
Your boss asks you to review the technical report that was generated by the previous test engineer (whose job you now have!) and used to
verify the design. The brief report states the following... "Ti Fix-It plates were manufactured from Ti-6Al-4V (grade 5) and machined into
solid 150 mm long beams with a 4 mm thick and 15 mm wide cross section. Each Ti Fix-It plate was loaded in equilibrium in a 4-point bending
test (set-up configuration is provided in drawing below), with an applied load of 1000N. The maximum stress in this set-up was less than the
yield stress for the Ti-6Al-4V…
Projects A and B are mutually exclusive. The minimum attractive rate of return (MARR) is 12%.
Using rate of return analysis, which project should be selected?
If the image fails to load here, go to https://www.dropbox.com/s/ld6wctqieu8jgwp/ROR.jpg
Year
0
1
2
3
4
ROR
A
- $750
$200
$200
$200
$600
17.68%
B
- $1,150
$300
$350
$400
$700
16.44%
O Project A
O Project B
O Both Project A and B
O Select none of the project.
O Insufficient information to make a decision.
B-A
- $400
$100
$150
$200
$100
13.69%
Chapter 7 Solutions
ENGINEERING DESIGN PROCESS
Ch. 7.9 - A set of measurable parameters with values...Ch. 7.9 - Given the need statement Design a domestic heating...Ch. 7.9 - Generate engineering characteristics for the...Ch. 7.9 - Develop a list of specifications for the following...Ch. 7.9 - List a set of metrics corresponding to the need...Ch. 7.9 - Devise a metric and a corresponding set for the...Ch. 7.9 - How might you establish precise and measurable...Ch. 7.9 - Can poor performance relative to one specification...Ch. 7.9 - Use a Web search engine to identify a list of...
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