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Innovative Crutch Systems Design Review: Concept Development and Analysis

Join us for Day 2 of our Crutch Systems Design Review led by Ana Allen, Joanna Dzionara-Norsen, Beverly Liriano, and Dan Sawicki. This session will cover key topics including initial and revised concepts using Pugh Charts, comparative analysis of innovative crutch designs, and engineering assessments for stability and load analysis. We will explore pros and cons of various concepts including aspects of aesthetics, functionality, and user experience. Engage with us as we present our findings and open the floor for questions on our novel crutch designs!

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Innovative Crutch Systems Design Review: Concept Development and Analysis

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Presentation Transcript

  1. P14042: Una-Crutch Right Move, Right Place, Right Time Systems Design Review Day 2 Ana Allen Joanna Dzionara-Norsen Beverly Liriano Dan Sawicki

  2. Agenda

  3. Concept and Architecture development

  4. Concepts

  5. Initial Concepts Rev 1Pugh Chart

  6. Initial Concepts Rev 1 Pugh Chart (Continued) Continued

  7. Initial Concepts Rev 2Pugh Chart

  8. Initial Concepts Rev 2 Pugh Chart (Continued) Continued

  9. New Concepts Rev 3Pugh Chart

  10. Connective Mechanism Terms

  11. Concept NA • Pros: • Springs relax user tension • Large surface area on single crutch • Hinge is simple to use • Cons: • Expensive • Many components • Too many steps to assemble Pin Hinge

  12. Concept NB • Pros: • Easy connection • Aesthetically pleasing • Innovative design • Minimal components • Spring base • Cons: • Bulky • Potentially expensive • Magnetic Connection Male/female mold Male/female mold and/or pin Magnetic

  13. Concept NC Male/female mold • Pros: • Adjustable handle • Spring base • Male/female mold is an easy connection • Innovative design • Cons: • Stability • Thickness Male/female mold Clamp

  14. Concept ND • Pros: • Lightweight • Revolutionary handle design • Cons: • Base connection is inconvenient if user is on one leg • Similar to axilla crutch Guide track Male/female mold Snap

  15. Concept NE Male/female mold • Pros: • Foldable into a cane • Lightweight • Stable • Cons: • Two separate bases • Not aesthetically pleasing • Pad is in contact with the ground Pin

  16. Concept NF • Pros: • Largest surface area for connection • No axillary component • Spring base • Minimal components • Cons: • Not aesthetically pleasing • Stability compromised Male/female mold for elbows

  17. New Concepts Rev 4Pugh Chart

  18. System Architecture

  19. Engineering analysis

  20. Engineering Analysis Overview

  21. Loads: Statics Analysis of Axilla Crutch

  22. High μs value to low μs value Ice will result in slip the quickest! Concrete is least likely to slip!

  23. Cantilevered Beam Analysis • Crutch handle modeled as a cantilevered beam with a distributed load and external moment: • Cross-sections considered: circular, square, hollow circular, I-beam, T-beam • Maximum stress from bending: = 25 MPa = 27.6 MPa L = 0.39in OD = 0.47 in = 12 mm Smallest dimensions at which the maximum stress from bending does not exceed the yield strength of aluminum L = 0.39in = 10 mm

  24. Static Analysis ASSUMPTIONS: P ΣFy=ma=0 Σfy=-P+Nf=0 P=Nf Nf

  25. Static Analysis ASSUMPTIONS: ΣFy=ma=0 ΣFy=Nf-Cy=0 Nf=Cy=P Dx Cx Cy Dy Nf

  26. Static Analysis P BX BX By By ΣFy=ma=0 ΣFy=2By-P=0 By=P/2

  27. Statics Analysis Ax Ax

  28. Static Analysis ASSUMPTIONS: Ax Bx By unknown: 3 unknowns Ax,BX,Cx Equations: 3 equations ΣFy=ma=0 ΣFx=ma=0 ΣM=0 Dy Cx Cy Dx

  29. Prototype Test Plan

  30. Risk Assessment

  31. Action Items for Subsystem Design Phase

  32. THANK YOU AND WE ARE NOW OPEN FOR QUESTIONS!

  33. Backup slide

  34. Detailed Project Plan (Week 7)

  35. Detailed Project Plan (Week 8-9)

  36. Bill of Materials

  37. Final Product Test Plan

  38. Questions?

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