Project P13414:

Portable, Multi-Use, Single Person Shelter

…also know as….the arborloo!

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

System Architecture

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

Concept Summary

Bucket Sleeve Insert

BOTTOM LID

BUCKET

BASE

GUIDE

RAILS

COUNTER

WEIGHT

SLEEVE

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

Final Prototypes

Tent Shelter Design Collapsible Design

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

Suggestions for Future Work