P14043-Smart Cane Senior Design Final Presentation
description
Transcript of P14043-Smart Cane Senior Design Final Presentation
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P14043-Smart CaneSenior Design
Final Presentation
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Introductions
• Lauren Bell – Mechanical Engineer• Jessica Davila – Industrial Engineer• Jake Luckman – Mechanical Engineer• William McIntyre – Electrical Engineer• Aaron Vogel – Mechanical Engineer
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Agenda• Problem Description• Design Challenge• System Design and Operation• Testing and Traceability• Project Process• Conclusion• Recommendations• Lessons Learned• Acknowledgements
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Problem DescriptionSafe and easy navigation in the world is difficult for the blind and
deaf/blind
InexpensiveIntuitive
ExpensiveTraining Required
Limited Situation Feedback
Excellent Situation Feedback
COMMON SOLUTIONS
Project Goal
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Design Challenge……To design, fabricate, assemble and validate a ‘haptic handle’
• To be attached to a traditional cane• Provide directional feedback to blind and deaf/blind users
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MSD Process Overview
Concept Selection
• Many ideas to one
Design Consideration
s
• Defining the engineering requirements & constraints
Generation of Design
• Drawings, Documentation
Fabrication and Assembly
Testing of Prototype
• Proof that prototype meets eng. requirements
MSD I
MSD II
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Design Considerations
Customer Desire Technical Requirement
Light weight < 1 lbs.
Small Grip Diameter < 1.5 inches
Quick Signal to User < 500 milliseconds
User Can Detect Direction *Will Elaborate Later
Battery Life > 4 hours
Customer desires needed to be transformed into technical requirements…
Learned – Fully understand the customer needs ASAP…otherwise time will be wasted
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Potential Concepts
• Track Ball• Piston Push Feedback• Torque ‘Jerk’• Magnetic Force Feedback• Scroll Navigation
Brainstorming and benchmarking yielded the following likely candidates…
Learned – Prototyping accelerates the concept selection process
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Optimizing Roller Design
• Roller Speed
• Roller Shape
• Bump Height
Learned – Quick and simple tests/prototypes will quickly narrow the design. Don’t overanalyze!
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Electrical Design
Electrical design driven by mechanical design and
Engineering requirements
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Mechanical Design
Design provides effective directional feedback
• ‘Bump’ Roller Sub-assembly• DC gear motor• Roller arms• Dowel pins• Press fit ball bearings
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Final Design
Documentation of everything is crucial for future project iterations
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Fabrication and Assembly• ~25 manufactured parts• Material Changes• Part Modifications• Time management
Learned – Fabrication and assembly will expose necessary
changes in the design
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Final tests were within predicted values
Testing and Traceability
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Prototype meets all non-technical requirements
Testing and Traceability
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Problem Tracking System
1. Identifying & Selecting
Problem
2. Analyzing Problem
3. Generating Potential Solutions
4. Selecting and
Planning Solution
5. Implementing
Solution
6. Evaluating Solution
Learned – Once problems started to arise and stack up, Problem Tracking significantly helped us manage the problems
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Risk Curve
Useful tool to track actual status against planned
20-Aug 9-Sep 29-Sep 19-Oct 8-Nov 28-Nov 18-Dec 7-Jan 27-Jan 16-Feb 8-Mar 28-Mar 17-Apr 7-May0
10
20
30
40
50
60
70
80
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Actual Planned
Sum
of R
isks'
Impo
rtan
ceIm
port
ance
= L
ikel
ihoo
d x
Seve
rity
Reduction of risks due to analysis (heat, stress, weight)
RISKS: Machining issues with thin ABS covers, ABS back cover breaks during testing phase, PCB not arriving on time
PCB working, assembly between handle & cane holds together, wires fit into handle design
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Project Plan and Efficiency
TaskPlanned Duration
Actual Duration Difference Efficiency
Order Electrical Parts 14 21 7 67%Fabrication of Parts 18 34 16 53%Order PCB 5 30 25 17%Testing 5 18 13 28%Assembly of Handle 5 15 10 33%Technical Paper 14 27 13 52%Total MSDII Tasks 83 108 25 77%
Item Item Description Date Due Owner Date Complete Status1 Complete editing paper 30-Apr Jess 30-Apr Complete2 Add electrical section into paper 30-Apr BJ 30-Apr Complete4 Turn in Poster 28-Apr Lauren 28-Apr Complete5 IEEE Design Presentation Submit to Prof. Slack 29-Apr Team 30-Apr Complete6 Complete user manual 30-Apr Aaron 30-Apr Complete7 Edit paper based on Gary's revisions 6-May Jess 6-May Complete8 Complete final report for customer 12-May Team 12-May Complete9 Turn in Paper 8-May Jess 8-May Complete
10 Final Presentation 13-May Team 13-May Complete
Final Deliverables
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Imagine RIT
• 200+ “Users”
• ~100% Positive Feedback
• University News Interview
Users at Imagine RIT demonstrated our project met its objectives and was a success.
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Lessons Learned
Project Management
Customer Interaction
Creating a good team dynamic
“What’s the best thing I can be doing right now?”
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Recommendations• Complete cane with integration to sensors
• Improve handle to provide feedback on changes in elevation and proximity of obstacles.
• Redesign handle with fewer parts and simple assembly
• Attempt to redesign with smaller batteries
• Strengthen the outer structure of handle
• Water/weather proof
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Recommendations for MSD→Shorter presentations in MSD I
→Teach project management skills in other courses
→Evenly distribute the team resources
→Use guides from industry
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Acknowledgements• Guides• Gary Werth• Gerry Garavuso
• Customers• Dr. Patricia Iglesias• Gary Behm• Tom Oh
• Professor Mark Indovina• Jeff Lonneville
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Motor Analysis• Torque/speed• Power consumption
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Design Grip Pressure Spec • Ensure handle functions under excessive grip• Measure pressure of displaced air for rough idea• Median pressure ~3 psi
• Compare to Grip Pressure Study*• FSR sensors on glove• “Crush grip” measured on 50mm diameter handle• 5 male and 5 female adults• Maximum pressure ~3.1 psi
• Our measurements matched the study, therefore:• Marginal Grip Pressure: 3 psi• Maximum (Design) Pressure: 5 psi
* Tao Guo qiang; Li Jun yuan; Jiang Xian feng, "Research on virtual testing of hand pressure distribution for handle grasp," Mechatronic Science, Electric Engineering and Computer (MEC), 2011 International Conference on, pp.1610,1613, 19-22 Aug. 201
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Required Motor Torque• Maximum moment could happen when:• Grip reaches design pressure• Pressure force is perpendicular to contact point• Palm contact area is maximum on roller• Two rollers are contacted
• Maximum moment caused by design pressure• 50.1 oz-in
• Motor selection will not be heavily constrained• Variety of motors that meet torque, size and rotation requirements
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Bump Rotation/Roller Analysis• Bumps per rotation• Servo to Roller Spacing• Effectiveness of our
model – Audience?
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Roller Force/Stress Analysis
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Force/Stress Cont’d