P17010: GearChair
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Integrated System Build & Test

Table of Contents

Team Vision for Integrated System Build & Test Phase

Summary

During this phase all remaining parts were machined and mounted to the chair. Work was done on the tech paper and the Imagine RIT proposal was submitted. Our team requested to be placed next to the Institute Hall access ramp (the ramp where our uphill testing was done) so that guests could attempt to use the wheelchair to climb the ramp or transverse the grass straight away.

It was planned that all tests should have preliminary data but difficulty with the left hand side drive train caused testing to be delayed. Speed and width testing were still performed.

Test Results Summary

Engineering Requirement Target Value Acceptable Threshold Customer Requirement Test Test Result Test Conclusion Expected Test Result
Speed (mph) 7 5 Increased Speed Speed Test 1.1 2 April 3, 2017 6
Speed on grass terrain (mph) 5 4 Ability to cover diverse terrain Speed Test 1.3 April 3, 2017 4.7
Speed on grade (access ramp) (mph) 4 3 3 Geared Hub Speed Test 1.2 April 3, 2017 3.4
Force to move (lbs) 15 20 Ability to cover diverse terrain Force Test 1.1, Force Test 1.2 March 31, 2017 9
Weight of prototype (lbs) 50 70 Easy maintenance Scale 44 April 4, 2017
Prototype cost ($) 1200 1200 Reasonable Pricing Monitor budget for parts, monitor time for assembly 999 1100
Material cost ($) 900 1000 Reasonable Pricing Monitor budget for parts 800
Shift Deflection (deg) 5 10 Shift Simultaneously Deflection Test 1.1 March 24, 2017
Person Time 1 Time 2 Average MPH
Ryan 16.61 16.04 16.33 2.1
Curran 18.18 18.53 18.36 1.9

Width testing was a success.

Risk and Problem Tracking

Risk Cause Effect Likelihood Severity Importance Action
Chair not done on time. Not enough slack time for setbacks. Lower grade 1 9 9 Have a detailed project plan with slack time.
Don't meet test results. Chair doesn't work as expected. Customer requirements are not met. 3 3 9 Allow time for retesting and rework.
Imagine RIT request denied. RIT either can't or won't give us space. A different exhibit will be needed. 0 1 0 Have alternate exhibit ideas.
Chair breaks. Too much force on the chair. Chair will have to be fixed, costing time and money. 3 9 27 Test Alexa in the chair first and try not to stress the chair.
Shifting does not work properly. Shifting test did not adequately reflect reality. Will not meet engineering requirement. 3 9 27 Test shifting and work on calibration until it works properly.

Plans for next phase


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