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Agenda
Project Overview
Customer Needs and Specifications
System Architecture
Concept Summary
Fabric Testing and Results
Design Costs
Final Prototypes
User Feedback
Lessons Learned
Suggestions for Future Work
Guide and Team Members
Guide
Sarah Brownell, Customer and Guide
Team Members
Betsy Khol, ISE (Project Manager)
Nate Mott, ME (Lead Engineer)
Diego Guinea, ISE
Frank Worczak, ME
Jason Yang, ME
Problem Statement
The primary objective of this project is to design
and develop an affordable, element-resistant,
portable arborloo that leverages both local and
manufactured materials. The shelter should be
constructed in such a way that it is easy to move,
and disassemble or repair after a hurricane. In
addition, the team is aiming to produce a structure
that Haitians will want to own.
Project Objectives
1. Low cost structure (ideally costs less than $50 for Haitians
to purchase)
2. Base design that safely covers an 18-20 inch diameter, 3-4
feet deep pit
3. Can be easily constructed with simple hand tools
4. Has a modern aesthetic that encourages Haitians to invest
in better sanitation
5. Has a modular design
6. Element and pest resistant
7. Portable
Key Customer Needs Importance Level 9
Importance Level 3 Importance Level 1
• Low product cost
• User safety
• Provide covering for 18-
20 inch hole with 3-4 feet
pit
• Simple assembly with
hand tools
• Portable
• Modern aesthetics
• Inexpensive repair costs
• Weather resistance and
durability
• User privacy
• User comfortability
• Light weight design
• Locally available or easily
imported material
• Quick installation
• Easy up keeping
• Pest prevention
• Protect user from
weather conditions
• Modular design
• Lighting
• Odor control
• 2 person assembly
Key Customer Specifications Specification Marginal Value Ideal Value Specification Marginal Value Ideal Value
Cost in lots of 1000 $ 100.00 $ 50.00
Cost of most expensive
replacement part with a
lifespan <3 years
<$10.00 <$5.00
Cost of most expensive
component $ 30.00 $ 20.00
% of users who rate the sit or
squat plate a 4 or above out of
5 for "comfortable to use"
60 80
Maximum hole size (in ground)
safely covered by base0.3 m 0.5 m
Time to disassemble and
reassemble (for repair)8 hrs 4 hrs
Provides privacy yes yesTime to disassemble and
reassemble (for installation)6 hrs 4 hrs
Minimum torque required to
begin tipping1200 Nm 2200 Nm
Number of tools required to
assemble5 2
Tripping hazards inside shelteronly behind sit/
squat plate0
Maximum mass of each
individual component before
assembly on site
200 kg 40 kg
Assembles/ disassembles with
hand toolsyes yes Ease of cleaning
cleans with soap,
water, and abrasive
sponge
cleans with water
and cloth
Weight of largest assembled
piece to move during
relocation
4320 N 2160 NInhibit fly entry--largest open
hole to pit10 18
Provides hand holds to
facilitate movingyes yes Resists rain
Wind speeds
withstood/accommodated
(estimated)
>75 mph >115 mphNumber of people required to
install3 2
% of those surveyed rating the
arborloo as aesthetically
pleasing
>50 >60Minimum lifespan of a
component (estimate)1 yr 3 yrs
Concept Summary
Tent Shelter Design Collapsible Design
WASHTUB
SEAT
1” PVC
FRAME
VENTILATION
SANDBAGS
FABRIC
COVERING
3/4” PVC
FRAME
PVC
PANELS
HINGED
ROOF
BENCH
SEAT
STAKED TO
GROUND
Fabric Testing
Two fabric options
Solution Dyed Polyester
14 oz Vinyl Coated Polyester
Testing Performed
UV-A Light Testing
Rip Testing
Tensile Testing
Fabric Testing Results
Solution Dyed
Polyester
14 oz Vinyl Coated
Polyester
UV-A Light Testing No impact on fabric No impact on fabric
Rip Testing (against
grain)
14.07 lbf 93.45 lbf
Tensile Testing
(against grain)
40.20 lbf 100.83 lbf
Design Costs
Item Cost
Tent Shelter Design $78.58
Collapsible Shelter
Design
$141.13
Bucket Sleeve Insert $16.51
Purchase Cost
Tent Shelter Design $95.09
Collapsible Shelter
Design
$159.52
*Costs in lots of 1, not 1,000
Assembly Instructions
TOOLS
Connecttwo90degConnectors(ITEM1.5)to
eachendoftheLintel(ITEM1.2)PVCGlue1
ITEM1.5(x2)
ITEM1.2(x1)
CONTINUENEXTPAGE
1.5
1.2
1.3
1.6
ConnectoneJackStud(ITEM1.3)toeachofthe
90degConnectorsinStep1PVCGlue2 ITEM1.3(x2)
ConnectoneT-Joint(ITEM1.6)toeachJackStud
inStep2PVCGlue3 ITEM1.6(x2)
TENTDESIGNMULTIUSESHELTER
TITLE
2OF4
P13414-A11DOCUMENT#
SHEET
DESCRIPTION VERSION
DATE
1.0
02/15/2013
REFERENCE
DWG.NO.FrameSubassemblyITEM1-FrameAssembly
STEP MATERIAL(QTY) ASSEMBLY INSTRUCTIONS
Design Meeting Specifications
Tent Shelter Design Collapsible Design
Cost in lots of 1000 $ 100.00 $ 50.00 Bill of Materials
$95.09
Bill of Materials
$159.52 Cost in lots of 1 not 1,000
Cost of most expensive
component $ 30.00 $ 20.00
Bill of Materials
14oz Vinyl Coated Polyester - $39.90
Bill of Materials
Corrugated PVC panel - $21.45
Force supported by floor over
hole in the ground>775 N >1,000 N Anthropometric measurements Anthropometric measurements
95%ile weight female is 774 N
95%ile weight male is 987.4 N
Provides privacy Yes Yes Yes YesBoth shelters have fully enclosed
covering
Minimum torque required to
begin tipping1200 Nm 2200 Nm
Tipping Testing
136 Nm
Tipping Testing
230 Nm
Both shelters have the ability to
be disassembled so they only
need to withstand breezy
conditions
Assembles/ disassembles with
hand toolsYes Yes Yes Yes
On site assembly only requires
hand tools; part preparation
requires some power tools but
they are available in Haiti
Provides hand holds to
facilitate movingYes Yes No No
Materials are all easy rolled up
together so hand holds are no
necessary
Wind speeds
withstood/accommodated
(estimated)
>75 mph >115 mph 50 mph 50 mph
Shelters are easily disassembled
which is recommended in high
winds
% of those surveyed rating the
arborloo as aesthetically
pleasing
>50% >60% 64% 52% Preliminary survey conducted with
other MSD students
Specification Marginal Value Ideal ValueTest Plan and Results
Comments
Design Meeting Specifications
Tent Shelter Design Collapsible Design
Minimum lifespan of a
component (estimate)1 yr 3 yrs
Fabric warranty covers fabric for 3 years.
All other components are plastic/metalAll components are plastic/metal
Cost of most expensive
replacement part with a
lifespan <3 years
<$10.00 <$5.00 Not applicable Not applicable No components are expected to
fail within 3 years
% of users who rate the sit or
squat plate a 4 or above out of
5 for "comfortable to use"
60% 80% 60% 84% Preliminary survey conducted with
other MSD students
Time to disassemble and
reassemble (for repair)8 hrs 4 hrs 3 hrs 1 hr
Time to disassemble and
reassemble (for installation)6 hrs 4 hrs 5.75 hrs 2.25 hrs
Number of tools required to
assemble5 2 9 8
All tools locally available in Haiti
Component availability for one
unit
some parts must
come by special air
freight or container
parts are local or
ship by standard air
Fabric required to be shipped in from
United StatesAll materials are available locally in Haiti
Ease of cleaning
cleans with soap,
water, and abrasive
sponge
cleans with water
and clothCleans with water and cloth Cleans with water and cloth
All materials are plastic
Inhibit fly entry--largest open
hole to pit10 18
Bucket insert has lid to keep flies out;
ventilation hose has mesh covering
Bucket insert has lid to keep flies out;
ventilation hose has mesh covering
Resists rain Water-resistant fabric covering on roof PVC plastic sheet on roof
Minimize odor
Bucket insert has lid to keep odor in pit;
ventilation hose comes out of pit to air
outside of shelter
Bucket insert has lid to keep odor in pit;
ventilation hose comes out of pit to air
outside of shelter
Number of people required to
install3 2 1 1
Specification Marginal Value Ideal ValueTest Plan and Results
Comments
User Feedback from Pilot Study
Tent Shelter Design Collapsible Design
Aesthetically pleasing 64% 52%
Comfortable to Use 60% 84%
Easy of Use 76% 80%
9 users preferred the tent shelter
13 users preferred the collapsible design
*Used a 5 point likert scale. Ratings of 4 or 5 are included in percentage calculation.
Percent of users who rated…
Lessons Learned
Successes Failures
Able to create two distinct,
functional prototypes
Designs meet most
specifications
Initial feedback on designs
was positive
Functioned effectively as a
team through entire
project
Unable to test all customer specifications
Only one design met marginal cost requirement
Unable to incorporate design with hole in ground due to weather
Testing was not as thorough as originally planned