Week 2

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

Creating new designs that address some of the Sponsor's concerns
Plan to start fabricating next week
Began testing the thermistors to analyze the slope of its Temp vs Voltage graph
Began testing filler and skin materials for thermal properties

Accomplishments from Previous Week

- Received silicone samples
- Received thermistors
- Acquired filler samples
  - Glass tile/marbles
  - Sand
  - Memory foam pillow
  - Ceramics from UCSD Crafts Center
- Ran six trials with the thermistors

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

- Come up with new designs in CAD that address the Sponsor's concerns (Marwan, Stephanie, Johnson)
- Finish testing all the materials (Marwan, Daniel, Allen)
- Finish Concept of Design Presentation (Marwan, Johnson, Daniel, Allen, Stephanie)

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments

- Get as many skin samples as possible
  - Received box full of samples from Smooth On
- Find out how the material is made; chemistry, and how it reacts
  - Going to do some tests involving the material submerged in rubbing alcohol
- Look into silicone as maybe our filler material as well
  - Have different silicone samples to test
  - Going to test Smooth On samples to see its ability to retain heat
- Possible filler materials: glass beads and sand
  - Bought glass squares from Home Depot
  - Bought glass marbles from Michaels
  - Got sand from the Warren volleyball courts
- Likes design #2 from our Presentation from last quarter
- Likes the idea of flipping the device to provide both a convex and concave surface; virtually reversible
  - Coming up with different designs that will provide concave and convex positions
- Agrees with Dr. Delson on working on different items in parallel
  - Will continue to research as we test and build in the upcoming weeks
- Device needs to be able to maintain a temperature in response to a stress (stress = above or below 37 degrees Celsius)
- Biggest feature of skin-to-skin is that it helps alleviate stress of baby
  - Going to run some tests later on the material
  - Looking into ways to test water
- Non-emergency device that ideally heats up in 10-15 min, 30 min is pushing it
  - Going to test the heating device, as well as the materials and see how long it takes to heat up
- Get away from using air
- Dr. Kim finds air insufficient as it is another element that may evaporate/dehydrate the baby
  - Removed Design #3 in the Presentation as an option
  - Going to come up with designs that no longer incorporate air or liquids
- Device starting point: Fixed and simple
  - First prototype will be strictly for the layers of the filler/heat reservoir and skin material
- Dr. Kim would like at least two prototypes at the end of the quarter
  - We are planning on having two prototypes done by Week 6
  - Final prototype by Week 10

Instructor Comments from Last Meeting and Actions Taken to Address these Comments

- Set a deadline for choosing an acceptable material
  - Set a deadline for Friday, January 20
- Complete a FMEA (Failure Mode and Effects Analysis) when working with human lives
  - Did the FMEA and found that overheating and the device/baby falling were of the biggest concerns
- Want something to hold heat a lot; look into ceramics
  - Bought memory foam pillow, glass marbles for testing
  - Got sample ceramics from the UCSD Craft center
- Add to the milestones
  - Talked with the sponsor, updated the milestones and posted them to the website

Risks and Areas of Concern

- What is the best way to heat up water on our heating pads?
  - Plastic bags melt on our heating source
  - Z-Flo sample melted a little
- How can we provide a consistent testing environment when doing our tests?
  - We have to decide on a material that we will place under the heating pad that is consistent for all our materials tests
  - Need a material that will not dissipate heat
- How can we have a design that is box concave and convex?
  - Using Design #2 would mean more filler and more skin material
    - More expensive
  - If reversible, where would our wires run?
    - Planning on putting electronics/wires under the unit itself

Resources or Information Required but not Available

- Is it possible for us to shape metal into a dome-like structure?
  - Do we need to have an outside company do it for us?
  - Do we have the tools in EBU2 to do it here?

Schedule

Describe upcoming milestone
- Finish testing materials, select materials for first prototypes, and decide on design
Update Gantt chart.