156B Week 8

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

• • Testing

Accomplishments from Previous Week

• Pressure Transducer

  • Calibrate and update code (Cameron)

  • Create connector (Cameron)

• LBNP

  • Finish sewing (Scott)

  • Material Testing for Fabric (Heja)

  • 3 New Poles (Tim)

  • Test prototype vacuum ports (Cameron)

  • 1" cam buckles (Cameron)

  • 2" cam buckles and ratcheting (Cameron)

  • Redesign 2 center supports (Heja)

  • Lasercam 2 center supports (Heja)

  • Order new D-Rings (Scott)

• Report

  • New photo of old LBNP designs (Cameron)

  • Reproduction drawings: Arches (Heja)

  • Reproduction drawings: Poles (Tim)

  • SAE Standard for hose fitting (Cameron)

  • New decision table and write up for harness/foam block/bike seat (Tim, Friday 9AM)

  • Decision chart for arches and half moons (Tim)

  • Type Equations (Heja)

• New Figures

  • Photos of old designs P6 (Heja)

  • New design solution w/o mattress P10 (Cameron)

  • Change figure to polycarbonate P16 (Cameron)

  • Annotated figure of fabric shell P17 (Cameron)

  • FBD and FEA figures:

    • End Piece (Heja FBD, Cameron FEA)

    • Rods (Heja FBD, Cameron FEA)

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

• • Testing

  • Test rate of return to atmospheric pressure. (All)

  • Test flow rate at -4 kPa. (All)

  • Determine flow rate required to maintain pressure with current design, seal neoprene if necessary. (All)

  • LBNP

  • Sew Neoprene (Scott)

  • Buy temperature/humidity sensor (Cameron)

  • Report

    • Use and Care manual: Flow Meter (Cameron)

    • Use and Care manual: Structure (Tim)

    • Update Bill of Materials (Cameron)

  • Add new standards discovered (Tim)

  • Poster

  • Outline with sections (Heja)

    • Fill with current content (Heja)

    • Update images (Heja)

  • Website 2nd Draft

    • Update all figures with current annotated ones (Cameron)

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

• • Look into a ball bearing type design for the waist seal that allows more movement for the patient

    • This is not a realistic scope for our project, but ideas will be documented.

  • Test LBNP with vacuum

    • Waiting for vinyl cement to set, to test.

  • Create Port for tubes to come out

    • In process of testing various ports.

  • Sew Neoprene seal

    • Done.

  • Need temperature and humidity sensors for LBNP chamber

    • Ordered.

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

• • Cut backup support arches. 

    • Done

  • Test creep of vinyl

    • Working with materials professors on this. Recording observations during testing.

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

• • Sean suggested using a space-bag one way valve. Tested valve and flow rate is low (20CFM). Trying to determine if this is sufficient. 

Risks and Areas of Concern

• • Flow rate with different ports

Resources or Information Required but not Available

• • Determination of flow through space bag port if 20 CFM is sufficient 

Schedule

• • Begin testing (5/25)

  • Update Gantt chart.

Budget (list amount spent and amount remaining)

• • $1112.15 Spent

  • $4387.85 Remaining

Progress on Report and Webpage

• • Comments taken care of in report.

  • Extra additions to report made including testing methods and updated CAD photos