156B Week 4

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

• • ABC: Working on initial prototype

  • Prototyping Failsafe mechanism

  • Laser Triangulation: can identify and locate laser, need to tweak parameters

  • Relative Positioning: still working through tutorials

Accomplishments from Previous Week

• • ABC:

  • CAD work: polycarbonate box with linear actuator

  • Linear actuator and polycarbonate was purchased.

    • First draft of pistons were made. 

    • Tube was too inconsistent, has since been bored to new diameter. New pistons are needed.

  • Housing:

    • CAD work: Prototype layout for testing and designing motor casings.

    • Constructed acrylic housing prototype:

      • iteration 1 - poor solvent wet out and severe cracking due to bonding technique.

      • iteration 2 - good solvent wet out

  • Failsafe Mechanism

    • Designed and created several buoy designs.

    • Tested designs in ocean, checking for visibility, stability, and geometric profile (for sleekness).

    • CAD work to integrate several of the best designs with the rest of the sub.

  • Electrical Schematic

    • 2D schematic drawn up (WIP)

• • Laser Triangulation

    • Successfully identify pixel coordinates of laser dot

    • Test code displays image with circle around laser on screen

• • Relative Positioning

    • Daniel's time was devoted to laser triangulation

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

• • Finish and test ABC prototype

  • Pressure test 10cm x 10cm housing prototype

  • Begin iteration three testing with o-ring seal if iteration two meets MEOP

  • Finalize preliminary CAD model

  • Test failsafe mechanism incorporating the chosen buoy design.

  • Get all electrical components talking to the Raspberry Pi

  • Figure out pulsed-laser circuitry

  • Get prototype laser triangulation setup built, programmed and calibrated (Daniel)

  • Finish OpenCV feature detection tutorials (Daniel)

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

• • N/A

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

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

Risks and Areas of Concern

• • Behind schedule on having prototypes started

  • Safety of custom housing design is not yet confirmed

    • Risk reduction for this will be finalized this week to start prototype construction

Resources or Information Required but not Available

• • Time

  • How will the sun affect our laser detection under water?

Schedule

• • Getting the pool set up and starting to scoot around using some kind of interface.

  • Update Gantt chart.

Budget (list amount spent and amount remaining)

https://docs.google.com/spreadsheets/d/1ClLdrAeYt9Xm-TOISy7Upd8Pb7oDbCv_VEf1yW20Bqg/edit#gid=0

Progress on Report and Webpage

• • Report

    • Using ShareLaTeX to write the report

    • Structure laid out

    • Introduction first draft complete