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Systems Level Design Review

Systems Level Design Review. Jib Transfer Bench – P13031 1/11/2012. Agenda. Problem Definition Customer Needs / Specifications Functional Decomposition Benchmarks First CAD Design Concept Generation Selection Criteria Matrix Preliminary Calculations Budget Estimate Project Plan.

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Systems Level Design Review

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  1. Systems Level Design Review Jib Transfer Bench – P13031 1/11/2012

  2. Agenda • Problem Definition • Customer Needs / Specifications • Functional Decomposition • Benchmarks • First CAD Design • Concept Generation • Selection Criteria Matrix • Preliminary Calculations • Budget Estimate • Project Plan

  3. Project Definition • Task is to design a mechanical solution to move a disabled jib trimmer from side to side so they can perform their crew function

  4. Customer Needs & Specifications SEE METRICS CHART

  5. Individual Specific Customer Needs • Gary & Zak • No leg mobility / core support • Desires to be fully secured • Cindy • Partial leg & core strength • Desires freedom to exit seat • Limited footprint available due to Richard’s chair • Height differences to consider

  6. Original Functional Decomposition

  7. Revised Functional Decomposition

  8. Benchmark

  9. Method of Motion Across Boat • Must be able to translate AND rotate independent of each other (i.e. not fixed)

  10. Seat Bracket Top Travel Bars Bottom Travel Bar Seat Traveler Support Bar Platform

  11. Handhold locking mechanisms • Handhold mechanisms on the previous team’s captain’s chair

  12. Handhold locking mechanisms • We plan to use something similar to secure our device to the front handholds to the boat

  13. Concept Generation • Brainstormed ideas for each main component of our assembly: • Seat • Method of motion (translation and rotation) • Method of propulsion • Harness • Locking mechanism • All must fall within our size constraints for Richard’s boat and without extending into the other team’s footprint

  14. Method of Motion (cont.) • Concept: Chair that can rotate on a pair of rails spanning the boat • Problem: With full 180° rotation, legs will smack

  15. Method of Motion (cont.) • “Seat-Within-A-Seat” initial sketch • Swivel chair on rails that span the boat One bar w/ bottom support Two bar w/o support

  16. Method of Motion (cont.) • Telescoping arm anchored on the boat floor (platform) • Seat mounted on top of arm

  17. Method of Propulsion • Jib trimmers with limited core strength • Propel themselves linearly • Rotate themselves • No electrical solution, 100% mechanical

  18. Method of Propulsion • Settled on a purchase system • Pulley system that will allow the user to pull themselves with a mechanical advantage

  19. Locking Mechanism (Chair) • Currently, not settled on a specific lock. • Fence lock, pin lock, friction plate • Cleating purchase system lines to lock chair • Check prices • Check compatibility of what we want to do

  20. Seat Concepts • Must support jib trimmer’s • Torso • Legs • Should have capability to accept and secure a user’s wheelchair cushion should they wish to use it.

  21. Benchmark - Team Paradise’s Seat • Lazy Susan design

  22. Seat Designs • Swivel Stool Go-Kart Seat Racecar Seat

  23. Harness • 5-point harness • Secured Double-Velcro vest • Lap Belt

  24. Selection Criteria Matrix Compiled all ideas, determined the best: • “Seat-Within-A-Seat” Chair • Harness or double-Velcro vest • Purchase system for motion • Undetermined locking mechanism • See Excel file

  25. Selection Criteria • Two separate systems based on individual customer needs

  26. Zak & Gary • Go-Kart Seat

  27. Cindy • Stool

  28. Preliminary Calculations • Calculations to prove the design: • Using aluminum traveler bars • Box tube deflection – 7075 Aluminum • Weight sitting on • Deflection: -0.0000131 inches • Shears at 19.9° • Box tube shear strength • Looking at smaller, cheaper, lighter materials

  29. Drawing • Assuming 260-lb human

  30. Sailboat Installation • Drop platform onto floor • Lock into first handhold (using similar locking device from Gold Medal Chair) • Jib trimmer sits in chair and straps in • Sail away!

  31. Budget Estimate • Based on the Gold Medal Chair: • $1,658 • Based on research of components that we are looking at: • $2,000

  32. Preliminary Project Plan

  33. Preliminary Project Plan (part 2)

  34. Project Plan Summary • Continue with design phase • CAD Modeling • Create Bill of Materials • Prove Design • Detailed Design Review in 3-5 weeks • Order parts • Build, install, sail!

  35. Suggestions?

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