Systems Level Design ReviewP15010: Arc Wheelchair Swing

Maggie Bates, Sean Kennelly, Owen Breese, Elizabeth Cutolo

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

BACKGROUND

Problem Statement, Deliverables, Current Market, Customer Needs and Engineering Specifications

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

Current Market

Current Market

Customer Requirements

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

Engineering Requirements

Engineering Requirements

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

SYSTEMS DESIGNHouse of Quality, Functional Decomposition

Functional Decomposition

Functional Decomposition

House of Quality

CONCEPT DEVELOPMENT

Morphological Analysis, Pugh Chart, Selected Concepts, System Architecture, Feasibility Analysis, Risk Assessment

Morphological Analysis/Pugh Chart

Concepts

Pugh Chart

Pugh Chart

Each Concept was used as Datum. Below are the

ranking averages.

Selected Concept

System Architecture

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

Feasibility AnalysisBraking System

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

Risk Analysis

Risk Analysis (Continued)

SUBSYSTEM DESIGN PREPProject Planning, Subsystem Design Focuses

Project Plan

Subsystem Design Phase Focuses

• Braking • Disc brakes

• Propulsion• Human powered

• Safety• Human powered

• Frame• Action item

Questions?