156B Finals Week

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

• • Analysis: All done

  • Fabrication: Finished final fabrication of all parts

  • Design: Design is completed

  • Tests: Implemented and analyzed final tests

Accomplishments from Previous Week

• • Finished final fabrication of all PP parts including the take-up spool

• • Presented to sponsor

  • Finished final implmentation of controller with the following values:

    • Kp = 100

    • Kd = 10

  • Controller analysis results

Figure 2.1: Tension with constant take-up spool velocity slightly slower than pinch roller velocity

From figure 2.1, it can be seen that tension is maintained, but a drag loop forms that grows in size, and will become an issue when running it for 160 ft. 

Figure 2.2: Tension with constant take-up spool velocity slightly faster than pinch roller velocity

From figure 2.2, the tension increases beyond the limit for the Nafion tubing as time goes on, but there is no formation of a drag loop. 

Figure 2.3: Tension with controlled take-up spool velocity

Figure 2.3 shows the tension (blue) is maintained in safe bounds without the formation of a drag loop. The control input (red) shows the motor output duty cycle for the take-up spool motor. 

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

• • Graduate

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

• • Sponsor was very happy with the presentation and final design solution. 

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

• • N/A

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

• • N/A

Resources or Information Required but not Available

• • N/A

Schedule

• • No further schedule required. 

Budget (list amount spent and amount remaining)

• • See final report for budget breakdown. 

Progress on Report and Webpage

• • Final report and webpage completed!