Systems Level Design Review P15010: 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 Problem Statement, Deliverables, Current Market, Customer Needs and Engineering Specifications BACKGROUND 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 Requirements Customer Rqmt. # Importance* Category CR2 9 Safety Minimizes distance of the chair off the ground during swinging for safety and size constraints. CR3 9 Safety Supports the weight of the wheelchair and the occupant. CR15 9 Safety Swing will remain at a safe speed throughout use. CR7 3 CR16 9 Description Arc facilities department has the ability to transport Versatility product from indoor areas to outdoor areas using doorways that range from 32" to 36". 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 House of Quality, Functional Decomposition SYSTEMS DESIGN Functional Decomposition Functional Decomposition House of Quality Morphological Analysis, Pugh Chart, Selected Concepts, System Architecture, Feasibility Analysis, Risk Assessment CONCEPT DEVELOPMENT 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 Analysis Propulsion 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 Analysis Braking System Feasibility Analysis Safety 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) Project Planning, Subsystem Design Focuses SUBSYSTEM DESIGN PREP Project Plan Subsystem Design Phase Focuses • Braking • Disc brakes • Propulsion • Human powered • Safety • Human powered • Frame • Action item Questions?