156B Week 3

Status: Although half of the team has been recovering from COVID-19 and working with quarantine restrictions, two of the team’s three main design concerns have been addressed. The aspects under consideration were the spar base design and how to incorporate two degrees of freedom, whether or not the PVC that the spar is composed of would need supplemental reinforcement, and how to best fasten or hold the ADV housing and sensor probe within the PVC spar section. The final CAD and analysis of the completed spar design is being finalized and a bill of materials is to be compiled to begin purchasing and final fabrication and assembly.

Accomplishments from Previous Week

• Began finalizing the Design Proposal presentation

• Worked toward completing the final report, and mostly finished Chapter 1

• Team webpage was formatted and the front page, reports tab, and project management tabs were updated

• Found the type of foam to be used in spar sections (West Marine: Evercoat Two-Part Pour Foam-it - foam expands by 25 times)

• Found the force of currents and waves below sea.

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

• Discuss the final design with the sponsor to begin ordering parts and fabrication

• Complete the design proposal presentation (All)

• Discuss what hardware tests that can/should be carried out once full-scale prototype is built (All)

• Contact our educational lab staff correspondent to get assistance on formulating simulations (Erik Zamarripa)

• Prepare purchase orders through Roxanne(Horim Yu)

• Design a support mechanism for ADV housing and probe (Eliran Q. Lenard, Erik Zamarripa)

• Finalize spar base and contact machine shop for fabrication (Ayesha Riaz)

• Update team website (Eliran: upload CAD files, Horim: budget forms, Erik: formatting, Ayesha: parts)

• Update gantt chart (Ayesha Riaz)

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (Zoom meeting: Tuesday 1pm, 1/12/2020)

• Professor Pawlak gave feedback on the design and changes were made after he pointed out that the use of hinges should be avoided. He emphasized the popular use of hose clamps during previous oceanological instrument deployments and noted many issues involving attaching one thing to another can be solved using hose clamps.

• Discussed the calculation of the Drag force with given the density and velocity values.

• Told the team we need to figure out how to establish the two degrees of freedom at the bottom of the spar to allow for

  • vertical alignment

  • to maintain rigidity

  • withstand the compressive force from the guy wires.

• Discussed what foam will be used.

• Also discussed the critical point of the design like door placement and ADVs placement on the spar.

Instructor Comments from Last Meeting and Actions Taken to Address these Comments (Zoom meeting: Tuesday, 6pm, 1/12/2020)

• Instructor gave some feedback on design ideas. Professor Tustaniwskyj warned that threads underwater are not a good idea, leading us to reconsider some design solutions that involved screwing components together. He also cautioned on the use of stainless steel on stainless steel as it is not immune to corrosion underwater

• Discussed spar materials and how 6’’ i.d. PVC pipes are not readily available in most hardware stores. Noted the similarities between PVC and ABS pipes, like how they can both be chemically bonded. Due to their similar properties, ABS pipes should be considered if they are more cost-effective or available.

• Suggested having better technical drawings for future meetings for better clarification and understanding of design ideas

Risks and Areas of Concern

• The spar base will likely need to be totally machined so designing the proper specifications is critical

Resources or Information Required but not Available

• Dimensions for the railroad wheel anchor to be used during deployment

Schedule

Milestones:

• Design review with Solidworks model - 1/20/2021
  - Run FEA analysis

• Finalize design of the spar - 01/19/2021
  - discussing with the team and the sponsor

• Prototype critical areas - 01/25/2021
  - base of the spar, connectors, e.t.c

Progress on Report and Webpage

• Need to make/take more graphics, photos, and videos to add to the team webpage

• Webpage has been formatted to comply with the Team Webpages Guidelines

  • Front Page was created

  • Reports tab and its files were formatted properly

  • Internal tab updated

• Completed week 2 draft for the final report

  • Title page

  • Background

  • Review of existing solutions

  • Statement of requirements

  • Statement of deliverables

  • Appendix with Individual Component Reports

Budget (list amount spent and amount remaining)

Team spent ($21) out of our $1000 budget limit