Week 9

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

• • Analysis

    • Completed a heat transfer conduction analysis

  • Design

    • Virtually finished

    • Moving onto building

  • Fabrication

    • Finished most of the fabrication for our final structure

  • Tests

    • Testing the stepper motors

Accomplishments from Previous Week

• • Items acquired/came in

    • HDPE

    • Leather

    • Stepper motors

    • Force sensing resistor

  • Ordered items

    • 14" x 14" baking sheet

  • Fabricated most of the structure

    • Walls

    • Linkages

    • Brackets for motors

  • Have motors connected to breadboard

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

• • Cure final mattress (Johnson, Daniel, Stephanie)

  • Finish fabricating (Daniel, Allen, Stephanie)

  • Work on motor stepper control (Johnson)

  • Work on temperature control (Daniel, Allen)

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (3/2/2012)

• • Likes the idea of having a quadrant of the big mattress with the heaters

    • Will cure mattress this week with everything complete

  • Will the wires come from side or top of silicone?

    • Will cure mattress with the wires ideally going straight down

    • Rebound (skin) will cover the entire mattress like a bed sheet

  • Will the motors and the panels hold the mattress?

    • Did a torque analysis

  • Final review presentation will potentially be on Wednesday, and being around 3:00-3:30 pm

Instructor Comments from Last Meeting and Actions Taken to Address these Comments (2/29/2012)

• • A lot on your plate

  • I like the 4 panel design, but is there a way to simply the mechanical actuation

    • Each panel has 1 degree of freedom

    • Each panel independent of one another

  • Do you have any temperature plots to show

    • Will have plots once we create the entire mattress

  • You spent a lot of time on fabricating the skin -> make sure to go into detail for your report and poster

    • Have begun documenting steps to making skin

  • Are there design alternatives to steppers

  • Look into servo motor

    • The price of servo motors was too much per motor

    • Decided to go ahead with the stepper motor

Student Comments from Last Presentation and Actions Taken to Address these Comments (2/29/2012)

• • Will baby fall off? Should you have a wall to prevent baby from falling out?

    • Dr Kim does not want walls on the final prototype

  • Rhythmic moving -> how?

    • Will use time stepper motors

  • Will the memory foam burn at the heating temperature?

    • No, the silicone will prevent that from happening

  • Servo motors might be the way to go

    • Looked into servos and found them to be too expensive

Risks and Areas of Concern

• • Time

    • Will we be able to finish everything?

  • Coding

    • Motors work?

    • Get temperature control working?

Resources or Information Required but not Available

• • None at the moment

Schedule

• • Describe upcoming milestone

    • Have final prototype finished

      • Structure done

      • Working motors with circular wave motion

      • Working temperature control

  • Update Gantt chart.

Budget (list amount spent and amount remaining)

• • Arduino Mega & Protoshield: 72.44

  • 14" x 14" baking sheet: 18.34

  • Remaining Budget: 480.06 - 90.78 = 389.28

Progress on Report and Webpage

• • Finished 2nd Draft

    • Waiting for it to be returned

  • Webpage

    • Updated 2nd Draft of the Webpage