11. 11
Engineering
Specification
Concept
Generation
System
Description
Engineering
Analysis
Manufacturing Testing Safety
Project
Management
Kayleigh Storey
Chicken Coop
Portable
Lifted By Two
People
Fit In A Trailer
Easily
Detachable
Parts
Chicken Care
Food and
Water
Keep Clean
Protect
from Pests
Environment
Keep Chickens
Dry
Egg Laying
Space
Outside Time
Temperature
Control
Healthy
Atmosphere
Predator
Protection
Maintenance
Remove Waste
Easily
Refill Food and
Water Easily
Egg Care
Collect
Don’t Break
Transport
Detect Egg
Keep Clean
Store
Keep Cool
Easy Retrieval
35 Egg
Capacity
Safety
Protect From
Predators
Ensure
Maintenance
Personnel
Safety
Index
94. 94
Measurable Specifications
Requirement Specification
Hen capacity 5 hens
Nest box height 9 in
Roost length 45 in
Food Storage 8.75 lb..
Feed rate 1.25 lb/day
Water Storage 8.75 qts
Water rate 1.25 qts/day
Egg storage capacity 35 eggs
Minimum size 10 ft2
Maximum opening 1 in2
Maximum size 8ft x 20ft
Force required to lift 100 lb..
Index
95. 95
Egg Tests
Test Result
Drop onto wood Cracked after ¾ “
Drop onto carpet Cracked after 6’
Lateral roll on wood 2°-6°
Longitudinal roll on wood 14°-16°
Index
96. 96
Index
Egg Tests
Static Egg Roll Test
Wood Vencomat
Medium Large Jumbo Medium Large Jumbo
Ave 2.7 1.6 1.6 11.2 10.1 9.3
Std Dev 1.18 0.70 0.50 2.75 1.20 1.72
Dynamic Egg Roll Test
Angle 1 Angle 2 Equivalent Angle Egg Size
% of Eggs that
Rolled
5 5 6.32 Medium 50
5 5 6.32 Large 80
5 5 6.32 Jumbo 80
5 8 7.26 Medium 100
5 8 7.26 Large 100
5 8 7.26 Jumbo 100
110. 110
Water Subsystem Part 3: Nipple (Bryan Costanzo)
Poultry Nipples- http://www.qcsupply.com/420011-push-in-style-nipple.html
- “Working pressure should be reduced to 1 PSI or less”
Equation: 𝑃 = 𝜌 ∗ 𝑔 ∗ ℎ
P = pressure ρ = density of water g = gravity h = height of water
-Maximum water level from bottom of piping = 17.375 inches = 0.441325 meters
-Gravity = 9.8
𝑚
𝑠2
-Density of water = 1000
𝑘𝑔
𝑚3
𝑃 = 1000
𝑘𝑔
𝑚3
∗ 9.8
𝑚
𝑠2
∗ (0.441325 𝑚)
𝑃 = 4,329.398
𝑁
𝑚2 = 4,329.398 𝑃𝑎
= 0.6279 𝑝𝑠𝑖
0.6279 𝑝𝑠𝑖 < 1 𝑝𝑠𝑖
Index
111. 111
Water Subsystem Weight Analysis (Bryan Costanzo)
Pressure Exerted on Supporting 2x4 by Water Tank
Source: http://www.woodworkweb.com/woodwork-topics/wood/146-wood-strengths.html
•Based on this source, the ultimate compression strength of pine perpendicular to the wood’s grain for pine is 470 psi
Equation: F/A < 470 psi
P = F/A = F/(t*w)
w = width of area that force is applied t = thickness of area that force is applied
F = force applied by water tank P = pressure applied to 2x4
Pressure Calculation:
P = (55 lb)/((3.5 in)*(23 in)) = 0.683 psi
0.683 psi < 470 psi
- Maximum pressure caused by water tank is below the maximum working pressure of a pine 2x4.
Index
112. 112
Structure Subsystem Part 2: Chicken Door (Logan Pickett)
𝐹 = 𝑊 + 𝑓𝑛 ∗ 𝜇
𝐹 … 𝐹𝑜𝑟𝑐𝑒 𝑊 … 𝑊𝑒𝑖𝑔ℎ𝑡 𝑓𝑛 … 𝑁𝑜𝑟𝑚𝑎𝑙 𝑓𝑜𝑟𝑐𝑒 𝜇 … 𝐹𝑟𝑖𝑐𝑡𝑖𝑜𝑛 𝑐𝑜𝑒𝑓𝑓.
𝑊 = 2.08𝑙𝑏𝑓 𝑓𝑛 = 1.4𝑙𝑏𝑓 𝜇 = 0.5
𝐹 = 3.12𝑙𝑏𝑓
The actuator chosen was selected because we need 12” of movement to lift
the door completely, don’t require a large lifting force, have a 12V DC source and
want it to take 4-8 seconds for the chicken’s safety. The actuator has a 12”
stroke, runs on 12V DC, has a lifting force of 22.5lbf, has a speed of 1.57 in/sec,
and also has a locking force of 225lbf that will eliminate the need of adding a
locking mechanism to keep predators from opening the door.
Index
113. 113
An optimum ambient temperature of 50⁰F was found, with a
cooling time of 5.3 hours.
The cooling rate required was calculated based on the rate of heat leaving the
storage box through conduction.
Assumptions:
Temperature differential between outer and inner wall = 50⁰F
Surface area = 5.70 ft2
Equation 1 is the heat rate equation based on a thermal resistance.
𝑞 =
𝐴∆𝑇
𝑅
(1),
And
𝑅 =
𝑡
𝑘
(2)
For k = 0.25 BTU in/hr ft2, and t = 0.5 in, R = 2 hr ft2/BTU. Using this value in
Equation 1 gives a cooling rate of 41.8 W. A peltier air cooler with a 52 W
cooling rate was selected.
q Heat rate
A Surface area
ΔT Temperature differential
R Thermal resistance
t Thickness of wall (insulation)
k Thermal conductivity of wall (insulation)
Index
115. 115
Structure Subsystem Part A: Base (Logan Pickett)
𝐹 = 𝐴 ∗ 𝑃 ∗ 𝐶 𝑑
𝐹 … 𝐹𝑜𝑟𝑐𝑒 𝐴 … 𝐴𝑟𝑒𝑎 𝑃 … 𝑊𝑖𝑛𝑑 𝑃𝑟𝑒𝑠𝑠𝑢𝑟𝑒 𝐶 𝑑 … 𝐷𝑟𝑎𝑔 𝐶𝑜𝑒𝑓𝑓𝑖𝑐𝑖𝑒𝑛𝑡
Largest wind load would be simulated if hit the 5’x5’ area like a flat plate
𝐴 = 25𝑓𝑡2 𝑃 = 0.00256 𝑊𝑖𝑛𝑑 𝑚𝑝ℎ 2 𝐶 𝑑 = 2
𝑀 = 𝐹 ∗ 𝐿
𝑀 … 𝑀𝑜𝑚𝑒𝑛𝑡 𝐹 … 𝐹𝑜𝑟𝑐𝑒 𝐿 … 𝐿𝑒𝑛𝑔𝑡ℎ
If that force is represented as a point load in the center of the coop and the coop is 2’ off
the ground the resulting moments would be:
𝑀𝑓 = 𝑍 ∗ 𝜎 𝑍 =
𝑏 ∗ ℎ2
6
𝑀𝑓 … 𝐹𝑎𝑖𝑙𝑢𝑟𝑒 𝑀𝑜𝑚𝑒𝑛𝑡 𝑍 … 𝑀𝑜𝑚𝑒𝑛𝑡 𝜎𝑓 … 𝑀𝑜𝑑𝑢𝑙𝑜𝑢𝑠 𝑜𝑓 𝑟𝑎𝑝𝑡𝑢𝑟𝑒
𝑀100𝑚𝑝ℎ = 5760𝑓𝑡𝑙𝑏 𝑍4𝑥4𝐿𝑢𝑚𝑏𝑒𝑟 =
3.5
12
∗
3.5
12
2
6
= 0.004135𝑓𝑡3
𝜎𝑟𝑒𝑞 =
5760
0.004135
= 1392880 𝑝𝑠𝑓
𝜎 𝑓 𝑝𝑖𝑛𝑒 = 710104 − 1670834 𝑝𝑠𝑓
Index
116. 116
Then to analyze the base boards that would be under a reactive
compressive stress.
𝑀100𝑚𝑝ℎ = 5760 𝑓𝑡𝑙𝑏𝑠 𝐴2𝑥4 =
3.5 ∗ 1.5
144
= 0.0364 𝑓𝑡2
If that moment is acting at the top of the 2x4 in compression the force
would be:
𝐹 = 𝑀 ∗ 𝐿 = 5760 ∗ 0.2917 = 1680𝑙𝑏𝑠
Acting over the cross sectional area 𝐴 results in a pressure of 320𝑝𝑠𝑖
which is below the compressive strength of wood perpendicular to the
grain, therefore the wood will not yield.
Index
117. 117
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Index
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Index
Editor's Notes
Coop must provide: food/water, nest boxes, roosts. Typical tasks include: refilling food and water, collecting eggs, and providing safe and clean environment (door operation)
Sponsor requirements dictate will be most attractive to backyard chicken owners (according to size constraints and number of hens housed).
Mostly own for self sustainability, health, and humane purposes—will allow for benefits without the hassle
Owners have even cited lack of “chicken sitters” as a challenge—will resolve this issue
If scaled up, attracts both small and industrial farm owners.
Will decrease manual labor cost by maximizing efficiency and limiting human error
Must ensure fully reliable system particularly in larger scale case
For manufacturers, design must be practical (feasible) and easily understood as well as inexpensive
Scaled up would require maintenance workers (specifically to larger scale)
Product must ensure safety and ease of adjustments
Distributors will require sturdiness of the product to prevent from common fault during distribution
Ease of portability also required
Base load- everything but cooler
Explain what this percentage means
Note throughout the weeks of testing battery capacity has never been an issue –even when running the cooler
Explain what this percentage means
Note throughout the weeks of testing battery capacity has never been an issue –even when running the cooler