156B Week 8

Status:

Design decisions have all been finalized and final prototype fabrication has been started. Components for the spar base are being manufactured and welded by the campus machine shop. The essential parts needed for project production, such as the 6” PVC pipes and couplings, have been acquired. Production schedule is on track and the team is now prioritizing the construction of the spar mooring. Secondary critical items, such as fastening materials, will be purchased this week to be added to the final prototype. Hardware testing methods are being finalized and will be conducted on the prototype during week 9 to ensure proper performance for the final design review presentation for the sponsor on week 10.

Accomplishments from Previous Week

• Critical components were purchased and final prototype fabrication was started

• Corrections from TA/instructor comments were made on Final Report

• Miniature scale model was tested in different settings

• Began working on the preliminary design review Presentation

• Spar base design was finalized and parts were dropped off at machine shop for fabrication

• Full design was approved by sponsor and secondary goals are now being addressed such as developing spar handles for divers and other additions to the prototype

Goals for Next Week (list names after each item).

• Improve and update Final Report and finish the 2nd draft (Team)

• Perform updated FEAs with all final component properties and imposed forces (Eliran Quentin)

• Retrieve manufactured parts from the machine shop (Erik Zamarripa)

• Purchase all secondary components and tools (Quentin and Erik)

• Manufacture and assemble the final design prototype (Erik Zamarripa & Ayesha Riaz & Eliran Lenard)

• Format final version of website and finish executive summary (Horim)

Sponsor Comments from Last Meeting (Zoom meeting 2/16/21)

• Final spar base design was discussed and approved

• The use of plain-end pipes with PVC couplings instead of rubber hose clamp connectors or bell end pipes was addressed and approved by sponsor for the final design

• Concerns of using galvanized stainless steel due to the zinc content which would also pose a problem for welding. Hot-dipping the manufactured steel part was recommended to solve the oxidation problem in the ocean. Hot-dipping shops are being explored to address the issue

• Emphasized the importance of finding the deflection/bending of the spar. Discussed the beam equation and how it was used to find the moments and the stresses at joints and deflection of the spar. He found the analytical methods appropriate and encouraged the use of the beam equation analysis to quantify how the spar will behave when deployed

• Concern of breakage, look out for the material limits, yield and tensile strength

Instructor Comments from Last Meeting (Zoom meeting 2/16/21)

• Analyzed the pros and cons of the material of the spar we are planning to use. Stainless on stainless is a problem that is going to be addressed with a lubricant or loc-tite for threads. Also suggested the use of cotter pins for holding the hinge pin in place

• Clarified analysis with the beam equation and MATLAB plots for stress and displacement of spar with guy wires attached at 5m and at 5*sqrt(2)=7m, as well as the moments and slope plots

• Was updated on final design of the base and the parts need that need to be fabricated/machined by Tom

Comments from Other Students in the Class (Presentation review comments)

• Their simulations/analysis were pretty well done, I felt as though they had done enough simulations to know the effects of their worst case scenario

• The explanation of why the previous version doesn't work is good

• Clearer diagrams this time

• You guys seem to have a very solid grasp of both the problem and your solution

• Clean CAD models and design layout! It was visually appealing

Schedule

• Describe upcoming milestone

  • Manufacture/assemble the final design of the prototype (2/13 - 2/25)

  • Quality control/test the final design (2/26- 3/2)

• Update Gantt chart.
  - Final CAD design approved by sponsor (02/18/2021)
  - Manufacture/assembly of the final design (02/30/2021)
  - Receive the all parts from machine shop (02/23/2021)

Budget (list amount spent and amount remaining)

• Team has spent ($418) out of the $1000 budget limit

Supplier: Industrial Metal Supply Co.

Purchased by Eliran Q. Lenard

GSP200

Galvanized Grade A pipe 2 IPS X SCH 40 ASTM-A-53 GRADE A GALV

Store Cutting - Band Saw

Tolerance (+) 0.063, Tolerance (-) 0.063, Size: 12” 1 piece

Qty (1), Total: $13.87

GSP250

Galvanized Grade A pipe 2 1/2 IPS X SCH 40 ASTM-A-53 GRADE A GALV

Store Cutting - Band Saw

Tolerance (+) 0.063, Tolerance (-) 0.063, Size: 12” 1 piece

Qty (1), Total: $19.87

DHCPN8212RR

8”x 2- 1 / 2”, Black Pneumatic, Rigid Plate Caster, Load Capacity 350 lbs,

DH,(CPN8212RR) 5.30lbs/ea

Qty (1), Total: $26.80

Supplier: Imperial Sprinkler Supply

Purchased by Eliran Q Lenard

600-040 PIPESW 6”

SCH 40 PVC” PIPE Total: $207.93

429-060 FTGS40 (x5)

COUPLING Sc h40 PVC total: $101.41

RHB-PT

GLUE RED HOT BLUE GLUE LOW VOC total: $15.10

Taxes: $17.29

Total: $341.73

Supplier: Home Depot

Purchased by Erik Zamarripa

1x 2ft 2'' ABS pipe, total: $3.87

1x 2ft 3'' ABS pipe, total: $7.97

1x 2ft 4'' ABS pipe, total: $9.97

Progress on Report and Webpage

• In progress

  • Continue working on the final report - Second Draft week 8

  • Update analysis figures such as FEAs and MATLAB plots

  • Chapter 4 needs particular attention to better explain major components
    

• Webpage has been updated

  • Week 8 progress report

  • All project files need to be uploaded that include purchased parts list and their specification sheets, CAD files, and MATLAB code

  • Executive summary needs to be linked on home page

  • Ensure all figures and images have proper descriptions and are addressed on final design page