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P14007: Wheelchair Assist. Introduction Che-An Lee – Industrial and Systems Engineer Dan Schuster – Mechanical Engineer Phil Medalie – Mechanical Engineer.

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Presentation on theme: "P14007: Wheelchair Assist. Introduction Che-An Lee – Industrial and Systems Engineer Dan Schuster – Mechanical Engineer Phil Medalie – Mechanical Engineer."— Presentation transcript:

1 P14007: Wheelchair Assist

2 Introduction Che-An Lee – Industrial and Systems Engineer Dan Schuster – Mechanical Engineer Phil Medalie – Mechanical Engineer Tom Elliot – Electrical Engineer

3 Agenda Problem Statement Current Product Expected Project benefits Deliverables Customer Requirements Benchmarking Specs Engineering Requirements

4 Problem Statement Current State – Current anti-roll back devices exist that can be added onto wheel chairs, as well as motorized wheel chairs to provide movement assistance – Majority of manual chairs do not come standard with these devices – Many of these assistance devices are expensive and inhibit some of the benefits of manual chairs Desired State – The device should maintain all of the benefits of a manual wheel chair(light weight, small turning radius, compact, etc.) – The device should also be able to aid the user when traversing inclines and declines, as well as prevent roll back when moving up an incline Project Goals – Design a system that encompasses the desired properties while maintaining the key benefits of a manual chair – Key Desired Properties Ability to provide movement assist up inclines Ability to decelerate the user when moving down declines Ability to prevent the wheel chair from rolling back down a hill and slipping out from under user Constraints – The wheel chair should still meet ADA standards regarding size constraints(doorways, buildings, etc.) – System Cost

5 Current Product Anti-Rollback Devices MagicWheels Manual Chairs Motorized Chairs Image References:

6 Expected Project benefits ● Solutions for manual wheelchair users ● Engineering design experience ● Basis for future senior design project

7 Deliverables Functional prototype that has the potential to be manufactured Test data verifying engineering requirements Bill of materials Detailed design with documentation User’s guide for operation

8 Customer Requirements

9 Benchmarking Specs Benchmarked Wheel Chair Values rqmt. #ImportanceSourceEngr. Requirement (metric)Unit of MeasureMarginal ValueTarget ValueManualPowered S1 9C1 Maximum weight at incline of 10 degrees where the wheel chair does not roll backwards lbf S2 9C12User/Assistor disengageable Hill Holder seconds52-- S3 9C12User/Assistor engageable Hill Holder seconds S4 9C1 Maximum incline angle, before tipping over backwards with user weight of 300lbf Same as original Better than original -- - S5 9C2 Maximum downhill speed at decline of 10 degrees at 300lbf user weight mph S6 9C12User/Assistor disengagable Gradual Grade seconds52-- S7 9C12User/Assistor engagable Gradual Grade Seconds S8 9C3Desired Movement Assist Input Force Ratio Ratio S9 9C12User/Assistor Disengagable movement assist seconds52-- S10 9C12User/Assistor engagable movement assist Seconds1.5--

10 Benchmarking Specs Cont’ Benchmarked Wheel Chair Values rqmt. #ImportanceSourceEngr. Requirement (metric)Unit of MeasureMarginal ValueTarget ValueManualPowered S11 3C5Wheel Chair Assist System Weight lbf S12 3C5Total System Weight(Chair Plus Assist) lbf S13 3C7Cost of Wheel Chair Assist System $ $676.60$3, S14 3C6Wheel chair width when folded in S15 9C9Wheel chair turning radius ft S16 3C4Time to remove wheel chair assist system minutes S17 3C10Length of Wheel Chair + Movement System in S18 3C10Width of Wheel Chair + Movement System in S19 3C8 Critical mechanical components have X number of use cycles cycles

11 Engineering Requirements rqmt. # Importan ce SourceFunctionEngr. Requirement (metric) Unit of Measure Marginal Value Target ValueIdeal ValueComments/Status S19C1 System Operation Maximum weight at incline of 10 degrees where the wheel chair does not roll backwards lbf Assuming the wheelchair doesn't tip over during test S29C12 System Operation User/Assistor disengageable Hill Holder seconds521 Can be disengageable by user/assister; should work like an on/off switch S39C12 System Operation User/Assistor engageable Hill Holder seconds S49C1 System Operation Maximum incline angle, before tipping over backwards with user weight of 300lbf Degrees Same as original Better than original S59C2 System Operation Maximum downhill speed at decline of 10 degrees at 300lbf user weight mph43User Varied S69C12 System Operation User/Assistor disengagable Gradual Grade seconds521 Can be disengageable by user/assister; should work like an on/off switch S79C12 System Operation User/Assistor engagable Gradual Grade seconds S89C3 System Operation Desired Movement Assist Input Force Ratio Ratio1.523 Without system/with system S99C12 System Operation User/Assistor Disengagable movement assist seconds521 Can be disengageable by user/assister; should work like an on/off switch S109C12 System Operation User/Assistor engagable movement assist seconds

12 Engineering Requirements Cont’ rqmt. # Importa nce SourceFunctionEngr. Requirement (metric) Unit of Measure Marginal Value Target ValueIdeal ValueComments/Status S113C5 System Portability Wheel Chair Assist System Weight lbf User and chair not included in weight S123C5 System Portability Total System Weight(Chair Plus Assist) lbf S133C7 System Operation Cost of Wheel Chair Assist System $ Production level costs S143C6 System Portability Wheel chair width when foldedin2618 Unchanged original width Based on the customer's wheelchair S159C9 System Operation Wheel chair turning radiusft210 S163C4 System Portability Time to remove wheel chair assist system minutes15105 S173C10 System Operation Length of Wheel Chair + Movement System in4836 Unchanged from original Based on the customer's wheelchair S183C10 System Operation Width of Wheel Chair + Movement System in4836 Unchanged from original Based on the customer's wheelchair S193C8 System Operation Critical mechanical components have X number of use cycles cycles This will be tested computationally and/or with a finite element analysis

13 Questions/Comments?


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