156B Week 4

Overview of Status of Analysis, Design, Fabrication, Tests, etc.

• • General rig design approved by Sponsor and Sponsor's supervisor

    • Can start ordering rig components now

Accomplishments from Previous Week

• • Raspberry Pi up and running

  • HAT purchased and received

  • CAD updated

  • Assembly drawings and Bill of Materials drafted

Goals for Next Week (list names after each item). Use specific and measurable objectives.

• • Find springs (Aryo)

  • Order/program sensors (Aryo/Tristan)

    • Accelerometers

    • Hall effect

      • Water proof (purchase waterproofed or do it ourselves)

      • Magnet determination for purposes

    • Need to consider ease of replacement

      • Communications protocol

  • Find/order/test foam for biteplate (Nicole)

  • Animate assembly in Solidworks (Julia)

  • Run FEA on assembly (Julia)

  • Design mounting point for PVC on biteplate (Julia)

  • Design paddle bumpers and attachment points (Julia)

  • Proof of concept hardware preparation, presentation (All)

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)

• • Changed all structural members to 80/20 with the exception of hydrophone mount per request of sponsor

  • Moved angle of arms to 15 degrees per feedback from Sponsor's supervisor

Instructor Comments from Last Meeting and Actions Taken to Address these Comments  (indicate date of comments and if via email or in person)

• • Looked into using compression springs instead of torsion springs (from Century Springs)

    • Re-designed pivot mechanics and attachment scheme to accommodate compression springs

  • Use accelerometer for paddle arms

    • Using accelerometer instead of magnetic potentiometer

Comments from Other Students in the Class (indicate date of comments and if via email or in person)

• • N/A

Risks and Areas of Concern

• • Range of motion of paddle pivots

    • Mount pivot 90 degrees neutral

      • ~5 degrees of movement

    • Mount pivot vertical neutral

      • Movement restricted by spring mount, need to offset

      • Potentially have to machine & anodize our own custom mount

  • Hall Effect Sensor

    • Waterproof ourselves vs buy one waterproofed

      • Leaning towards buying the waterproofed one, albeit more expensive

      • Waterproofed one facilitates, or even eliminates, maintenance.

    • Lead time

    • Foam suitable for purposes

    • Magnet suitable for purposes

Resources or Information Required but not Available

• • N/A

Schedule

• • Hardware prep for proof-of-concept next week

  • Presentation for proof-of-concept

Budget (list amount spent and amount remaining)

• • $93. 94 spent

  • $906.06 remaining

Progress on Report and Webpage

• • Added impact to society section