p14415: subsystem design review patrick morabito john wilson michael coffey nathan conklin samuel...
TRANSCRIPT
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P14415: Subsystem Design Review
Patrick Morabito John Wilson Michael CoffeyNathan ConklinSamuel Svintozelsky
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Agenda
• Background and Recap Information
• Engineering Requirement Flowdown
• Subsystems
• Proof of Concepto Prototypingo Economic Analysis
• Test Procedure & Risks
• Moving Forward
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Background InformationInadequate sanitation is a major cause of
preventable illnesses in children around the world. According to UNICEF, diarrhea alone causes over 1.6 million deaths in children under 5. These illnesses can easily be prevented by improving sanitation. However, cost is a major barrier limiting the adoption of sanitation in Haiti.
Peter Morgan’s Arborloo is a simple latrine built over a small pit, which when filled is then moved to a new pit location. The old, filled pit then has vegetation planted on top of it, such as a fruit tree.
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New Learnings
• Meeting with Johnnyo Low-cost reaffirmed as critical constrainto Building capabilities explored
• Mock up buildo Hole size requirement revisited
o Platform size improvementsxxx
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Engineering Requirements - Updates
• S4-Maximum squat hole diameter
• S8-Complexity of tools needed
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Critical Requirements Recap
• Costo Continuously surfaces as
primary requirement
• Weighto Crucial to remote users
• Load Bearing Abilityo Main functional requirement
(From Engineering Requirements) https://edge.rit.edu/edge/P14415/public/Project%20Planning%20Phase/Engineering_Requirements_14415.xls
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Highlighted Functions
• Guides Raw Sewage
• Supports Weight
• Separates User from the Pit
• Establishes Barrier Between User and Waste
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Subsystems
• Manufacturing Process
• Material Selection
• Shape & Form
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Manufacturing Processes
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Materials Considered
Cost Matrix
Acquired Quotes for these materials are a little too costly.
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Design #1
• Explored Rib Design Models
• Built Full Scale Mockup
• Built Vacuum Formed Scale Model
• Two Directions
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Design #1 Rib Design Set up
2000N Load
Fixed at 4 corners
Model Tensile Strength: 9.5 * 10 ^7 N/m^2Fixed at 4 corners of baseLoad: 2000N Load*Refer to reports for mesh information
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Design #1 Exploration
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Design #1: Highlighted Beta Designs
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Design 1 Rib Design Summary
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Design #1 - Half Scale ModelPurpose:
● Test ABS Plastic● Test vacuum forming capabilities
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Design #1 - Half Scale Model Cont.
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Design #1 - Half Scale Model Cont.Lessons Learned
Weak/Thin Corners
Poor edge draft/vacuumStrong ribs & durable top surface
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Design #2
• Full Scale Mockup
• Material Selections
• Cost Analysis
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Design #2 Cost Analysis
• 1 x 6” Designo 11/16” thicko 14’ Plastic board o 10’ 2x2 ribbingo $43.7 total
• 10-¼ x ¼”o ¼” thicko 1.5 12’ boardo 10’ 2x2 ribbingo $35.66 total
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Cost Analysis - Design #1 & #2 Full Scale Models
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Designs #3 & #4
• Not Feasible Designs
• Cardboard Modelso Difficult to sit and stando Scale required to cover hole required separate
supporting base
• Better as Seatso Can easily be integrated with a bucket
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Updated Risks Assessment (Technical)
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Updated Risks Assessment (Project)
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Updated Risks Assessment (Team)
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Test Plan - Revisited
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Updated Project Plan
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Key Decisions from Subsystem Phase
• Design 1: Two Directionso Plastic Ribbing & Supportso Recycled/Repurposed Material
• Design 2: “Local Industry”
• Designs 3 & 4: No Longer Full Designso Possible Seat Integration
• Possible Manufacturing Processeso Vacuum Formingo Rotational Moldingo “Kit”o Recycled
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Moving Forward - Next Phase
• Design 1: Repurposed Materials Method
• Design 2: Support Structure
• Lid Designs
• Seats (Upgradable)
• Cleanability
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Questions?