156B Week 5

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

• • Switch to Arduino MKR 1000 board

  • began fabricating piston

  • battery holder complete

  • updated stroke length of linear actuator

Accomplishments from Previous Week

• • Finalized piston size

  • Finalized linear actuator stroke length (confirmed by sponsor)

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

• • Finish making piston to specific tolerances (Doris)

  • Manufacture inner "wedding cake" structure - Duncan

  • Code for system approach-target and piston-locking steps. (Hugo/Michael)

  • Check for actual volumetric compression of system against simulated results (Zach)

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

• • Disregard antenna for current project, suggest using 4 in stroke for linear actuator (5/2, in person)

    • called vendor to ask about exchange policies. No longer taking antenna into account when calculating for buoyancy control.

  • Initial descent time does matter, under 30 seconds is ideal (5/2, in person)

    • linear actuator and thrusters are more than capable of accomplishing that.

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

• • Ordering issue should be communicated with sponsor/Scripps (4/26, in person)

    • resolved, ordering through Scripps, not Roxanne.

  • Check Parker O-RIng Manual to make sure O-ring has the right squeeze (4/26, in person)

    • checked and finalized piston diameter

  • Think about ordering parts that are not discontinued for future mass production purposes (4/26, in person)

    • ESC discontinued by Blue Robotics but sold by other companies, just not with firmware already in place.

  • Proof of concept do not need to be for hardware if hardware already comes with spec sheet (4/26, in person)

    • Did pseudocode, simulations and analysis instead for proof of concept.

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

• • none

Risks and Areas of Concern

• • Parts are taking a long time to come in

  • System battery usage uncertain in operating conditions

Resources or Information Required but not Available

• • Differences between testing condition and actual operating condition

    • presence of internal waves, particles etc.

Schedule

• • Assemble system as soon as parts come in

  • Update Gantt chart.

Budget (list amount spent and amount remaining)

• • Spent: $1,663

  • Remaining: $337

Progress on Report and Webpage

• • Up to date