Evan Bair
Engineering Management
Homework 1
January 14, 2016
Chapter 1 Questions
1. The main similarity between each authors definitions is the use of the words efficient or
effective. The authors stated that management is a way to achieve goals through t
Table 103
High-Carbon and Alloy
Spring Steels
Source: From Harold C. R.
Carlson, Selection and
Application of Spring
Materials, Mechanical
Engineering, vol. 78, 1956,
pp. 331334.
Name of
Material
Similar
Specications
Music wire,
0.800.95C
UNS G10850
AISI
Table 141
Symbols, Their Names,
and Locations
Symbol
Name
Where Found
b
Net width of face of narrowest member
Ce
Mesh alignment correction factor
Eq. (1435)
Cf
Surface condition factor
Eq. (1416)
Eq. (1416)
CH
Hardness-ratio factor
Eq. (1418)
Cma
Mesh ali
Table 151
Symbols Used in Bevel Gear Rating Equations, ANSI/AGMA 2003-B97 Standard
Source: ANSI/AGMA 2003-B97.
AGMA
Symbol
ISO
Symbol
Description
Units
Am
A0
CH
Ci
CL
Cp
Rm
Re
ZW
Zi
ZNT
ZE
Mean cone distance
Outer cone distance
Hardness ratio factor for p
Table 151
Symbols Used in Gear Rating Equations, ANSI/AGMA 2003-B97 Standard (Continued )
AGMA
Symbol
ISO
Symbol
Description
P
P
Design power through gear pair
hp (kW)
Pa
Pac
Pacu
Pat
Patu
Pd
Pm
Pmn
Qv
q
R, r
Rt, rt
Pa
Paz
Pazu
Pay
Payu
hp (kW)
hp (kW)
hp
1737
Problems 1717 through 1722 have given you enough experience with V belts to convince you
that a computer program would be helpful in the design/selection of V-belt drive components.
Write such a program.
1738
Experience with Probs. 1723 through 1728
Wider face widths on gears require more shaft length. Originally, gears with hubs
were considered for this design to allow the use of set screws instead of high-stressconcentration retaining rings. However, the extra hub lengths added several inches to
th
Table 112
Dimensions and Load Ratings for Single-Row 02-Series Deep-Groove and Angular-Contact Ball Bearings
Fillet
Shoulder
Bore,
OD,
Width,
Radius,
Diameter, mm
mm
mm
mm
mm
dS
dH
Load Ratings, kN
Deep Groove
C10
C0
Angular Contact
C10
C0
10
30
9
0.6
12.
(a) If two fasteners are used, should the array be arranged vertically, horizontally, or diagonally? How would you decide?
(b) If three fasteners are used, should a linear or triangular array be used? For a triangular array,
what should be the orientation
Evan Bair
Engineering Management
Homework 2
January 26, 2016
Problem 1
a) Forecast sales for 2016 using a simply moving average
F2016 = (83,000 + 81,000 + 62,000 + 53,000) / 4 = 69,750
Forecasted sales for 2016 using simple moving average = $69,750
Foreca
Evan Bair
Engineering Management
Homework 3
February 2, 2016
Book Problem 5-8
From the expected value method I would choose alternative 2 with a value of $130,000.
Using maximax I would select alternative 1 with a value of $800,000
A1 = 800
A2 = 500
A3 =
Evan Bair
Engineering Management
Homework 5
February 25, 2016
Chapter 8 Questions
8-2.
A good control system needs to be understandable, efficient, and flexible. A control system needs
to be understandable because otherwise it will be useless or at best i
Balance Sheet, Hytek Corporation, December 31, 2012
Assets
Current Assets
Cash
Accounts Receivable
Inventory
$50,000.00
$100,000.00
$300,000.00
Total Current Assets
Property, Plant, and Equipment
Accumulated Depreciation
Net Property
$450,000.00
$470,000.
Preface
Objectives
This text is intended for students beginning the study of mechanical engineering
design. The focus is on blending fundamental development of concepts with practical specification of components. Students of this text should find that it
Figure 210
Creep deformation
Creep-time curve.
1st stage
2nd stage
3rd stage
Time
Of course, heat treatment, as will be shown, is used to make substantial changes in
the mechanical properties of a material.
Heating due to electric and gas welding also cha
Table 24 (continued)
Family
Classes
Short Name
Glasses
Soda-lime glass
Soda-lime glass
Borosilicate glass
Borosilicate glass
Silica glass
Silica glass
Glass ceramic
Glass ceramic
Polymers
(the thermoplastics and
thermosets of engineering)
Acrylonitrile bu
1812
Final Analysis
At this point in the design, everything seems to check out. Final details include determining dimensions and tolerances for appropriate ts with the gears and bearings. See
Section 78, p. 383, for details on obtaining specic ts. Any sma
In the fps system, standard gravity is g 32.1740 ft/s2. For most cases this is rounded
off to 32.2. Thus the weight of a mass of 1 slug in the fps system is
W = mg = (1 slug)(32.2 ft /s2 ) = 32.2 lbf
In the ips system, standard gravity is 386.088 or about
at the inside ber of the spring. Substitution of max = , T = F D/2, r = d/2, J =
d 4 /32, and A = d 2 /4 gives
=
8F D
4F
+
3
d
d 2
(101)
D
d
(102)
Now we dene the spring index
C=
which is a measure of coil curvature. With this relation, Eq. (101) can be r
(c) Estimate the fatigue factor of safety n f if the applied moment varies between
Mmin = 1 to Mmax = 5 lbf in.
Solution
(a) For music wire, from Table 104 we nd that A = 201 kpsi inm and m = 0.145.
Therefore,
Sut =
A
201
=
= 294.4 kpsi
dm
(0.072)0.145
Us
Table 114
Bearing-Life
Recommendations
for Various Classes
of Machinery
Type of Application
Life, kh
Instruments and apparatus for infrequent use
Up to 0.5
Aircraft engines
0.52
Machines for short or intermittent operation where service
interruption is of
157
Worm-Gear Analysis
Compared to other gearing systems worm-gear meshes have a much lower mechanical
efciency. Cooling, for the benet of the lubricant, becomes a design constraint sometimes resulting in what appears to be an oversize gear case in light
Eq. (1528):
(W t )all = Cs D 0.8 (Fe )G Cm Cv
= 1000(6)0.8 (2)0.823(0.211) = 1456 lbf
t
Since WG < (W t )all , the mesh will survive at least 25 000 h. The friction force W f is
given by Eq. (1561):
Wf =
t
f WG
0.0178(1284)
=
f sin cos n cos
0.0178 sin 4