156B Week 2

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

• • Analysis: Following initial design proposal, analysis will be reviewed and reassessed to ensure optimal parameters and selections

  • Design: Based on analysis performed, any necessary design changes will be made as soon as possible this week

  • Fabrication: Parts and materials will be ordered by the end of this week

  • Tests: Individual testing will be held this week/early next week during manufacturing and design phases; an official trial of the system is scheduled for sixth week

Accomplishments from Previous Week

• • Individual Component Analyses Completed:

    • Buoy/Line: Determined ideal buoy material selection, line selection, and installation orientation (Mike)

    • Pressure Housing: Determined ideal pressure housing material and construction (Alvin)

    • Commanded/Timed Release:

    • Release Mechanism:

  • Received feedback and advice regarding initial design proposal from sponsor

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

• • Purchase any parts needed for prototype assembly as soon as possible (All)

  • Construct buoy and optimize buoyant force (Mike)

  • Manufacture pressure housing and construct inner component housing (Alvin)

  • Design and order electronics components for first test (Katherine)

  • Design and manufacture release mechanism for first trial (Matthew)

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

• • Anti-seize grease could work for threaded release drive; silicon-bronze could also be a viable material selection

  • Dual O-rings about the motor shaft could be used to seal the pressure housing and geared motor

  • An overall assembly which does not have to be taken apart and put back together during initial setup and launch is preferred

    • Possibilities include communication via blutooth or charging batteries inductively, etc.

  • Retrieval line must be mounted to the sampler frame

    • Expected load on wire of 50 lbs.

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

• • Look into fishing reel mechanism

    • Fishing reel mechanism has been considered as tensioner option

    • Following trials involving simpler spooling systems, the fishing reel design may be implemented if necessary

  • Consider a solenoid release mechanism

    • Solenoids have been researched and compared to DC geared motor equivalents

  • Continue burn wire solution

    • Burn wire releases continue to be researched to find a cost-effective solution

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

• • Waterproofing pressure vessel and motor

  • Potential entanglement of wire with simplest approach

  • Generating enough buoyant force to reliably surface the float with retrieval line

  • Ensure the anchoring point on sampler frame is secure enough to hold wire during hoisting of the assembly

  • Ensure that all onboard electronics operate without failure due to vibration, shorting, or some other factor

Resources or Information Required but not Available

• • N/A

Schedule

• • Initial Design Proposal Presentation (6-Apr-2015)

  • Weekly Meeting with Sponsor (10-Apr-2015)

Budget (list amount spent and amount remaining)

• • Spent: $105

  • Remaining: $895

  • Total: $1000

Progress on Report and Webpage

• • Webpage updated (6-April-2015)

  • Initial design Proposal Completed (6-Apr-2015)