systems level design review p15010: arc wheelchair swing maggie bates, sean kennelly, owen breese,...
TRANSCRIPT
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Systems Level Design ReviewP15010: Arc Wheelchair Swing
Maggie Bates, Sean Kennelly, Owen Breese, Elizabeth Cutolo
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Agenda• Project Background
• Project Statement• Current Market• Customer Needs/Engineering Specifications Highlights• Updates Since Project Definition Review
• Systems Design• House of Quality• Functional Decomposition
• Concept Development• Morphological Chart• Pugh Chart• Selected Concept• System Architecture• Feasibility• Risk Assessment
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BACKGROUND
Problem Statement, Deliverables, Current Market, Customer Needs and Engineering Specifications
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Problem Statement
Our team has been tasked with developing and implementing a mechanism that allows individuals
in wheelchairs to experience the sensory stimulation one gets from swinging without exiting
their standard or powered wheelchairs for under $2,500 by May 2015.
Primary Customer: Amanda Bement, Arc of Monroe Day Services Director
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Current Market
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Current Market
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Customer Requirements
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Customer RequirementsCustomer Rqmt. # Importance* Category Description
CR2 9 SafetyMinimizes distance of the chair off the ground during swinging for safety and size constraints.
CR3 9 SafetySupports the weight of the wheelchair and the occupant.
CR15 9 Safety Swing will remain at a safe speed throughout use.
CR7 3 VersatilityArc facilities department has the ability to transport product from indoor areas to outdoor areas using doorways that range from 32" to 36".
CR16 9 Budget Project total cost will not exceed $2,500
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Engineering Requirements
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Engineering Requirements
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Updates Since Last Review
• Stakeholder Communication• Arc of Monroe Outreach
• Opened Dialogue with Director, Physical Therapist and Facilities
• Project Champion • Dr. Dan Phillips from Biomedical Engineering
• Customer Requirement and Engineering Specifications• Working towards solidifying with all members of the customer
team
• Higher level understanding of vestibular simulation• Safety Regulations
• What Arc will Accept as Product• What resources are available for our use• Impact on Budget
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SYSTEMS DESIGNHouse of Quality, Functional Decomposition
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Functional Decomposition
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Functional Decomposition
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House of Quality
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CONCEPT DEVELOPMENT
Morphological Analysis, Pugh Chart, Selected Concepts, System Architecture, Feasibility Analysis, Risk Assessment
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Morphological Analysis/Pugh Chart
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Concepts
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Pugh Chart
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Pugh Chart
Each Concept was used as Datum. Below are the
ranking averages.
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Selected Concept
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System Architecture
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Feasibility AnalysisPropulsion System
Equation Minimum Value Maximum Value
Mass (lbs) N/A 650 850
Mass (Newtons) 1 lb = 4.44822 Newtons 2891.3 3781.0
Velocity (m/s) N/A 0.5 1
Time (s) N/A 2 7
Acceleration (m/s^2) a=v/t 0.0714 0.5
Force Required (Newtons) F=m*a 206.5 1890.5
Force Required (lbf) 1 lb = 4.44822 Newtons 46.43 425
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Feasibility AnalysisBraking System
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Feasibility AnalysisSafety Considerations
• 1:16 maximum slope for ramp
• Objects may not protrude 60’’ wide space of an
accessible route
• Designers must consider optimal layout for experience
• Turning space for wheelchair shall be located
immediately adjacent to swing
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Risk Analysis
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Risk Analysis (Continued)
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SUBSYSTEM DESIGN PREPProject Planning, Subsystem Design Focuses
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Project Plan
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Subsystem Design Phase Focuses
• Braking • Disc brakes
• Propulsion• Human powered
• Safety• Human powered
• Frame• Action item
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Questions?