156B Week 7

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

• • 3 potential water pumping systems

    • Belt drive with rotary pump

      • Status: assembled

    • Friction drive with rotary pump

      • Status: assembled and tested

    • Test results: 3 GPM

    • Slider crank mechanism with diaphragm pump

      • Status: being designed

  • Implement pin attachment system to engage/disengage pump attachment assembly when traveling (bike moving) vs. pumping water (bike stationary)

*Focus preliminary design around single speed bike --> adjust size and gear ratios to be compatible with OX1

Accomplishments from Previous Week

• • Built friction-drive system and tested on bike

    • Did not achieve project deliverable of 5 GPM

  • Manufactured parts for the belt-drive system

• Assembled belt-drive system

  • Determined required torque to stroke diaphragm pump

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

• • Test belt-drive system with rotary pump and make adjustments to improve performance - Dennis, Kyle, Jamie 

  • Finish design, build, and test slider crank mechanism with diaphragm pump- Jessica, Brandon, Derek

  • Determine optimal water pump design based on test results - Team

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

• • Did not meet with sponsor Week 6

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

• • Meeting in person 5/10/17

    • Don't need gear ratio increase if implement diaphragm pump design with slider crank

      • Consider slot wear over time; attach on pedal to eliminate hardware

    • Ask pump manufacturer how they determined 90 strokes for 10 GPM maximum performance (due to negative pressure difference?)

    • Dr. T will send powerpoint with bicycle info

    • Is the cost/simplicity of the final product still feasible?

      • Action: Set specific limits with sponsor

    • Can create simulation of frictional loss by testing with mud on bike wheel

    • Strobe meter to measure RPM

      • Action: Obtained instrument from Steve for testing purposes

    • Many comments on draft one of final report

      • Action: Made edits and necessary additions to report

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

• • Need to purchase better rotary pump to reach required 5GPM with friction drive system

    • Sponsor specified pump cost < $100

Resources or Information Required but not Available

Schedule

• • Testing Day - Tuesday

  • Meet with Instructors - Wednesday

  • Report Corrections - Friday

Budget (list amount spent and amount remaining)

• • Spent $433.90

  • Remaining $2,066.10

Progress on Report and Webpage

• • Webpage - 50%

  • Report - 70%