Smart Cane – P14043 Sub-Systems Design Review - PowerPoint PPT Presentation

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  1. Smart Cane – P14043Sub-Systems Design Review Lauren Bell, Jessica Davila, Jake Luckman, William McIntyre, Aaron Vogel

  2. Agenda • Project Scope • Concept Selection • Engineering Requirements • Component Breakdown • Engineering Analysis • Test Plan • Risk Analysis • Project Plan • Audience Feedback Please

  3. Project Scope

  4. Concept Selection • Final Concept Ideas • Finger Scroll • Palm Roller • Palm Roller and Finger Scroll • Final Concept Selection • Palm Roller without Finger Scroll

  5. Engineering Requirements

  6. Estimated Power Consumption

  7. 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

  8. 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

  9. Motor Type Selection • Design Factors to meet Engineering Requirements • Rotational speeds of 50 to 70 RPM • Commonly available at 50 oz-in

  10. Engineering Analysis:Bump Rotation Characteristics • Effective haptic zone – lower palm • Effective Bump Height • Bump Frequency

  11. Component Breakdown

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

  13. Roller Force/Stress Analysis

  14. Force/Stress Cont’d

  15. Roller Assembly Support

  16. Handle Material Selection • Desirable Qualities • Moisture wicking • Higher Coefficient of Friction • Possible Options • Softex • Neoprene • Tennis Racquet Handle Cover • Top Choice • Synthetic Cloth - Nylon • Tennis Racquet Handle Cover

  17. Handle Weight Estimate

  18. Cost Estimate

  19. Test Plan

  20. Signal Flow Diagram

  21. Test Plan Detection System Simulator

  22. Micro Family Selection

  23. Risk Assessment

  24. Risk Assessment

  25. Risk Growth Curve

  26. ProjectPlan

  27. Network Diagram

  28. Immediate Next Steps • Engineering Analysis [ 10/28] • Power Requirement • Moment of Inertia • Research “standard” haptic sensitivity • Electrical Subsystem [10/31 ] • Engineering standards electrical design must meet • Design power supply • Layout sensor, micro and power supply location • Estimate weight distribution • Pseudo code • Mechanical Subsystem [ 10/31] • CAD drawings • Assembly drawings • Select shelf parts • Test Plan [ 10/28] • Establish and draft test plans • Risk Growth Curve [Weekly]