156B Week 9

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

• • Testing in underway.

  • The following corrective actions have been taken in light of test results and recent analysis: a smaller diameter (0.017" diameter) Spectra Line has been purchased; the motor control code has been modified to achieve perfect tracking at higher shaft speeds; the sonar sensor has been mounted off-center; the batteries are wired without diodes.

Accomplishments from Previous Week

• • Assembly instructions completed.

  • Technical drawings of the pressure case components completed.

  • Batteries are wired.

  • Sonar sensor is waterproofed.

  • Rotary shaft seal and bearing are installed in the motor endcap.

  • Successful test of the rotary shaft seal was performed.

  • Control code for winch is written.

  • Testing results, assembly instructions, buoyancy analysis, and technical drawings are added to the report.

  • A new draft of the webpage is completed.

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

• • Calibrate the sonar sensor for underwater use. -Matt

  • Mount bulkhead connector to sensor endcap. - Thomas

  • Perform pressure test of entire assembly with bulkhead connector. - Johnathan.

  • Write code for interfacing with sonar sensor and the microSD board. - Merlin and Matt

  • Wire bulkhead connector.- Jebsen

  • Perform field test in Canyonview pool. -Everyone

  • Create draft poster. -Everyone

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

• • Bart asked us to analyze how the angle between the drogue and the surface buoy would be affected by current differentials. We found, among other things, that the horizontal error is less than 7 feet at currents of less than 1 knot.

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

• • Professor Tustaniwskyj asked us to design a damping system in order to avoid slacking of the line and impulses on the line. We have decided to include a long spring that connects the surface buoy to the line.

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

• • none

Risks and Areas of Concern

• • The sonar sensor dead zone is expanded from 30 cm to approximately 120 cm.

Resources or Information Required but not Available

• • none

Schedule

• • Field test in Canyon View pool is upcoming.

Budget (list amount spent and amount remaining)

• • Amount spent: $649

  • Amount remaining: $1851

Progress on Report and Webpage

• • Assembly instructions, technical drawings, testing results, and analysis are added to the report.

  • The webpage has been edited.