156A Week 10

Project Management: Coastal Monitoring-Ropeless Traps

Week 10 Project Management

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

• • Completed Introductory meetings with sponsors

  • Finished brainstorming and selected components to analyze

  • Began Risk Analysis and Individual Component analysis

Accomplishments from Previous Week

• • Determine each teammate’s individual component analysis

  • Reached out to the lobsterman Eric and planning to meet with him this week (weekday preferably)

  • Purchased a mechanical kitchen timer to start identifying engineering approach to design.

    • Discussed gear ratio and ideas relevant to applications of torsion spring

  • Discussed ideas about helical torsion springs and considering force (rate = lbs in /deg) needed for design. Will contact merchants to learn more about choosing the right torsion springs

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

• • Meet with Eric krebs on Wednesday 3/13

  • Meet with professor Tuesday 3/12

  • Every individual completes their component analysis by Friday afternoon 3/15

  • Finish Risk Analysis Presentation Saturday 3/16

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

• • Dr. Chadwick was pleased with our progress and he wanted us to continue to keep him updated as we finalize the design

    • No additional action has been taken beyond sending him a progress report

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

• • Dr. Tustaniwskyj suggested our team to assign each team member a component to analyze for the sponsored project. Our team has taken these considerations into account by discussing with the professor the five prospective components to analyze.

  • Our team started with 3-5 engineering ideas for each key mechanism and narrowed it down to the favorable and prospective ones (not finalized).

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

• • Carver (MAE 156A student) said this was a useful project that is challenging due to the design constraints like cost

  • Patrick (MAE 156A Student) said the project was interesting and if our team is capable of going on fishing boat rides, he would be jealous.

Risks and Areas of Concern

• • Latch-CAM-Spring Timing Mechanism: Torsion Spring Selection Process

    • Replacing the built-in electrical motor system with a mechanical winding spring system. Such risks involve choosing proper torsion springs (e.g. helical spring idea, proper spring index, number of coils, overall cost)

    • Strategy: Determining proper spring dimensions first and then research and contact companies for information about strengths and weaknesses of our selection of torsion springs.

      • Performing torque analysis of the latch spring system to determine the minimum torque needed for the final clock gear

  • Material selectivity (non-corrosive materials are preferable) in finalized design

Constraints and Issues to Consider

• • Limiting cost to a reasonable amount

  • Simplifying front end user interface so that the device can be reset quickly

  • Storage of the mechanism so that it will fit within the trap itself.

Resources or Information Required but not Available

• • O-ring Design

    • http://www.parker.com/Literature/O-Ring%20Division%20Literature/ORD%205700.pdf

  • Spring Design

    • http://springipedia.com/torsion-about.asp

    • http://springipedia.com/torsion-design-theory.asp

    • http://springipedia.com/torsion-general-design.asp

    • http://springipedia.com/torsion-leg-configurations.asp

    • https://www.mrspring.com/docs/Torsion%20Spring%20Design%20Info.pdf

    • https://www.acxesspring.com/torsion-spring-rate-force-constant.html

    • https://www.leespring.com/browse_catalog.asp?springType=T

    • http://www.springsandthings.com/pdf/spiral-torsion-springs.pdf (used for less than 360 deg of rotation)

    • http://www.stmarysspring.com/torsion-springs/

    • https://www.acxesspring.com/torsion-spring-applications.html

    • https://dpk3n3gg92jwt.cloudfront.net/domains/century/pdf/csc_catalog_web.pdf

  • Potential Torsion Spring Supplier Websites

    • https://www.springsfast.com/torsion-springs.php

    • https://www.thespringstore.com/catalogsearch/advanced/?search=stock-torsion-springs

    • https://www.centuryspring.com/catalog/torsion-springs

Schedule

• • Meet with Eric krebs on Wednesday 3/13

  • Meet with professor Tuesday 3/12

  • Every individual completes their component analysis by Friday afternoon 3/15

  • Finish Risk Analysis Presentation Saturday 3/16

Budget (list amount spent and amount remaining)

• • Amount Spent: $22.43

    • Purchased a kitchen timer that is intended to be deconstructed

  • Amount remain $4200

Progress on Report and Webpage

• • We are in the early stages of performing the analysis and creating the webpage