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P14043-Smart Cane Senior Design Final Presentation

P14043-Smart Cane Senior Design Final Presentation. Introductions. Lauren Bell – Mechanical Engineer Jessica Davila – Industrial Engineer Jake Luckman – Mechanical Engineer William McIntyre – Electrical Engineer

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P14043-Smart Cane Senior Design Final Presentation

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  1. P14043-Smart CaneSenior Design Final Presentation

  2. Introductions • Lauren Bell – Mechanical Engineer • Jessica Davila – Industrial Engineer • Jake Luckman – Mechanical Engineer • William McIntyre – Electrical Engineer • Aaron Vogel – Mechanical Engineer

  3. Agenda • Problem Description • Design Challenge • System Design and Operation • Testing and Traceability • Project Process • Conclusion • Recommendations • Lessons Learned • Acknowledgements

  4. Problem Description Safe and easy navigation in the world is difficult for the blind and deaf/blind Project Goal Inexpensive Intuitive Expensive Training Required COMMON SOLUTIONS Limited Situation Feedback Excellent Situation Feedback

  5. 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

  6. MSD Process Overview MSD I MSD II

  7. Design Considerations Customer desires needed to be transformed into technical requirements… Learned – Fully understand the customer needs ASAP …otherwise time will be wasted

  8. Potential Concepts Brainstorming and benchmarking yielded the following likely candidates… • Track Ball • Piston Push Feedback • Torque ‘Jerk’ • Magnetic Force Feedback • Scroll Navigation Learned – Prototyping accelerates the concept selection process

  9. Optimizing Roller Design • Roller Speed • Roller Shape • Bump Height Learned – Quick and simple tests/prototypes will quickly narrow the design. Don’t overanalyze!

  10. Electrical Design Electrical design driven by mechanical design and Engineering requirements

  11. Mechanical Design • ‘Bump’ Roller Sub-assembly • DC gear motor • Roller arms • Dowel pins • Press fit ball bearings Design provides effective directional feedback

  12. Final Design Documentation of everything is crucial for future project iterations

  13. Fabrication and Assembly • ~25 manufactured parts • Material Changes • Part Modifications • Time management Learned – Fabrication and assembly will expose necessary changes in the design

  14. Testing and Traceability Final tests were within predicted values

  15. Testing and Traceability Prototype meets all non-technical requirements

  16. Problem Tracking System Learned – Once problems started to arise and stack up, Problem Tracking significantly helped us manage the problems

  17. Risk Curve 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 Useful tool to track actual status against planned

  18. ProjectPlan and Efficiency Final Deliverables

  19. Imagine RIT • 200+ “Users” • ~100% Positive Feedback • University News Interview Users at Imagine RIT demonstrated our project met its objectives and was a success.

  20. Lessons Learned • Project Management • Customer Interaction • Creating a good team dynamic • “What’s the best thing I can be doing right now?”

  21. 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

  22. Recommendations for MSD • Shorter presentations in MSD I • Teach project management skills in other courses • Evenly distribute the team resources • Use guides from industry

  23. Acknowledgements • Guides • Gary Werth • Gerry Garavuso • Customers • Dr. Patricia Iglesias • Gary Behm • Tom Oh • Professor Mark Indovina • Jeff Lonneville

  24. Motor Analysis • Torque/speed • Power consumption

  25. 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 Guoqiang; 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

  26. 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

  27. Bump Rotation/Roller Analysis • Bumps per rotation • Servo to Roller Spacing • Effectiveness of our model – Audience?

  28. Roller Force/Stress Analysis

  29. Force/Stress Cont’d

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