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P14417: B9 Plastics - Particle Filter Detailed Design Review

P14417: B9 Plastics - Particle Filter Detailed Design Review. Dan Anderson / Thomas Heberle / Perry Hosmer / Karina Roundtree / Kelly Stover December 10, 2013. Agenda. Problem Definition (5 minutes) Updated Design and Bill of Materials Justification (15 minutes)

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P14417: B9 Plastics - Particle Filter Detailed Design Review

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  1. P14417: B9 Plastics - Particle FilterDetailed Design Review Dan Anderson / Thomas Heberle / Perry Hosmer / Karina Roundtree / Kelly Stover December 10, 2013

  2. Agenda • Problem Definition (5 minutes) • Updated Design and Bill of Materials Justification (15 minutes) • Assembly Procedure (5 minutes) • Technical Analysis of Design (20 minutes) • Test Plans (20 minutes) • Project Management (10 minutes)

  3. Problem Definition

  4. Problem Statement Current State: • In order to use the Better Water Maker (BWM) users must first pour the water through a cloth before being treated. Desired State: • The device should clear particles from water to allow the BWM to operate more effectively. • The device should be simple to use and operable by both women and children. Project Goals: • Analyze the design selected by P13418 • Decrease Turbidity and Total Suspended Solids • Improve the effectiveness of the Better Water Maker Notable Constraints: • Must be usable by both women and children • Only locally available materials may be consumed • Must not negatively impact the smell and taste of water

  5. Project Scope & Deliverables • Project Scope • Eliminate particles greater than 5 microns in size • Produce a design that is economically viable for use in developing countries • Design the device to be reusable, and use only consumable parts that are locally available • Deliverables to date • Functional prototype • Bill of Materials • Design Drawings • Assembly and manufacturing plan • Test plan and results

  6. Customer Requirements

  7. Engineering Requirements

  8. Updated Design and Bill of Materials

  9. Updated Drawing – CAD Drawing

  10. Updated Drawing – Exploded BOM 1 3 2 4

  11. Bottomless Bucket

  12. Bottomless Bucket • Bucket in BOM chosen was inexpensive • Most buckets would work

  13. Lid

  14. Lid • Matches bucket bottom, reusable • Inexpensive

  15. 5 Micron Mesh

  16. 5 Micron Mesh • Stainless steel- limits corrosion • Material often used in filters

  17. Bucket

  18. Bucket • Inexpensive • 5 gallon deemed a good size • Same as bottomless bucket

  19. Spacer

  20. Rod

  21. Spacer and Rods • Used to seal in mesh in assembly and to provide space between mesh and lid

  22. Indented BOM

  23. Assembly Procedure

  24. Technical Analysis of Design

  25. Mesh Corrosion • Stainless steel is in a family of alloy steels containing a minimum of 10.5% chromium. All stainless steels have a higher resistance to corrosion than their mild steel counterparts. • This resistance to attack is due to the naturally occurring chromium-rich oxide film formed on the surface of the steel. • The film is rapidly self-repairing in the presence of oxygen. Damage by abrasion, cutting or machining is quickly repaired.

  26. Stress Analysis • Establish • Contact Regions • Pressure and Structural Support • Mesh • Establish and then Refine • Von Mises • Displacement

  27. Contact Regions

  28. Pressure and Supports

  29. Mesh

  30. Von Mises

  31. Displacement

  32. Engineering Requirements

  33. Engineering Requirements

  34. Time to Clean • Pilot study: select 30 participants, provide cleaning instructions, time the process • Hypothesis test (95% confidence) on the average time to clean product • H0: µ >= 5 minutes • HA: µ < 5 minutes • Adjustments in sample size (i.e. additional observations) may be necessary depending on the variance in the observed results • If the cleaning time is over the target value of 5 minutes, test for marginal success of 10 minutes

  35. Engineering Requirements

  36. Number of Tools Required for Cleaning • Count of tools required • Nylon sponge or brush is best material to clean stainless steel mesh

  37. Engineering Requirements

  38. Weight

  39. Engineering Requirements

  40. Start-up Time • Pilot study: collect 30 observations of start up time • Hypothesis test (95% confidence) on the average start up time • H0: µ >= 10 seconds • HA: µ < 10 seconds • Adjustments in sample size (i.e. additional observations) may be necessary depending on the variance in the observed results • If the cleaning time is over the target value of 10 seconds, test for marginal success of 30 seconds

  41. Engineering Requirements

  42. No Power Source Needed

  43. Engineering Requirements

  44. Labor Cost Estimations • Machining Bucket • Cut out bottom of bucket: ~5 minutes • Drilling holes (with template): ~ 5 minutes • Cutting Mesh: ~ 1 minute • Hot air welding: ~ 5 minutes • Total time: 16 minutes • Assuming a $15 / hr wage, total cost is $4

  45. Total Cost of Components

  46. Engineering Requirements

  47. Mean Time to Failure

  48. Engineering Requirements

  49. Operating Costs • All components will last longer than the required 2 years. • Operating costs will be $0/year

  50. Engineering Requirements

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