156B Week 7

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

• • Thicker acrylic tunnel frame built (glued together with Tom's help)

    • taken over to Sponsor lab in AP&M

  • About to fabricate CO₂ flooding system

  • Have begun small testing of tunnel with sponsor at his lab

Accomplishments from Previous Week

• • Thicker acrylic tunnel frame built

    • New fans mounted

    • Flow speeds with 4 fans mounted in parallel reach ~.58 m/s

      • We additionally have 4 more fans that can be used as another set in series to reach greater flow rates

  • Fans tested for consistency using oscilloscope

    • Average RPM of all 8 fans 3346 with STD of 5 RPM.

      • highly consistent

  • Some preliminary testing of tunnel at sponsor lab

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

• • Order rails to hold apparatus (Harry)

  • Setup electronic system based on sponsor comments and feedback (Emilio)

    • test power supply and equipment for consistency and functionality (Emilio)

    • order power supply similar to Sponsor's if functional (Harry/Emilio)

  • Build acrylic CO₂ system, and test (Melissa, Elliott)

    • Also plan contingency options (Melissa, Elliott)

  • If rails arrive, begin construction of apparatus base (Harry, Emilio, Melissa, Elliott)

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

in person 5/11/15

• • Perhaps skip arduino and use the powersource directly to control fan speed

    • considering, will test both and see if there is serious loss in speed control (we prefer arduino)

  • Perhaps not as important to have projection on bottom in lieu of possible built-in carbon dioxide system in acrylic

    • Still would like tunnel to be suspended atleast ~3inches or so

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

In person, 5/6/15

• • Does sponsor want Closed Loop system?

    • No, unnecessary, our sponsor just wants an open loop system where he tunes the current/voltage for the trial

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

• • New fans produce higher level of noise ~85dB, though still less than most comparable fans on market

    • Tested using equipment in sponsor lab

    • Flies begin to notice sound around ~80dB

    • Will the fans cause adverse effects/reaction from the flies

Resources or Information Required but not Available

• • n/a

Schedule

• • construct CO₂ flooding system using acrylic

    • Test, and implement contingency plans if necessary

  • Order rails

Budget (list amount spent and amount remaining)

• • 1/4 in. Thick Acrylic Sheets: Purchase Total $353.18

    • 4 Sheets 1.7m x .3m

  • Week's Total Spending: $353.18

  • Budget Remaining: $3082.85

Progress on Report and Webpage

• • Process of fixing instructor comments on report

    • Able to fill in more due to progress on actual prototype