156B Week 7

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

• Second iteration of motor mount plate ready for machine work 

• Hardware for motors purchased

• Design for Hydrophone isolation done, machine work started

• Design for volume constraint plate done (to rec-create computer board roof) 

• Ball screw ready for installation

Accomplishments from Previous Week

• Designed motor plate and mounting plates for testing (Hannah)

• Ball screw machined to size (Hannah)

• Design changes made for sandwich mounts on all Al rods (Hannah, Hurby)

• Machined new Aluminum support rods (Hurby, Ilija)

• Gears finally came in!!

• Final report make over - feedback incorporations started

• Testing apparatus complete

• Machine work of piston complete

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

• Continue testing: compare 3 motors on speed, noise, efficiency (Hurby, Ilija)

• Vibrational Damping testing: no mounts vs. grommets vs. all sandwich mounts (Hannah)

• Compare efficiency of ball screw & lead screw (Devin)

• Build hydrophone isolation structure (Myles)

• Finish volume constraint plate (Myles)

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

• Jules & Paul approve with isolating hydrophone as long as waterproof integrity is maintained

• Jules & Paul approve of sandwich mounts on all aluminum rods

• Jules & Paul approve of trading out 1/6 power for speed & decreased vibrations

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

• Addressed

  • Ideas for mechanical stop on ball screw:

    • 2 nuts jammed against each other with blue locktite

    • c clip (probably better option) - this option was incorporated into ball screw machine work

• To be resolved:

  • Finals Report (working on)

    • Use caption & cross reference for tables/figures (insert-->captions)

    • Make figures more readable.

    • Once decide on final design, put alternate design solutions in appendix

    • Use metric units

    • Deliverables: Add materials, tests, data, calculations

    • Quantify things you're trying to achieve instead of saying "make it faster"

    • use bullet points for functional requirements

    • more annotative pictures

    • add preliminary designs to appendix

    • put why the ball screw is beneficial

    • use 'inexpensive' instead of cheap

    • Section IV: Make them into bullet points

    • annotate grommets, make references to your figures

    • Safety section topics: getting someone hurt, environmental harm, reward from marketing, add a specific benefit and how it would impact society

    • put experiences under lessons learned

    • Conclusion section: tasks and how well your device works

• Quantifying sound recorded on hydrophone: use LabVIEW FFT, talk to Isaiah to acquire a DAQ board

• Isolation of top plate: use sandwich mounts on 2 inner rods. Find small sandwich mounts; machining current mounts smaller is not a good idea. 

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

• N/A

Risks and Areas of Concern

• N/A

Resources or Information Required but not Available

• N/A

Schedule

• Set Final Design Review with Dr. Jaffe for 6/3 at 4pm

• Gantt chart updated and uploaded to website

Budget (list amount spent and amount remaining)

• Spent: $834.09

• Remaining: $2165.91

Progress on Report and Webpage

• In process of making edits from Dr. T & Patrick. Updating the component descriptions, deliverable, appendix, and prototype performance