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Apollo 18 Final Presentation

Chris Davidoff Jacob Hermann Jared Levin Lindsey Buxman. Apollo 18 Final Presentation. Maggie Williams Peter Merrick Cody Gondek Nathan Buzzell. 12/11/12. Mission Overview. Our mission was to calculate the speed of sound as our satellite rose to 30 km.

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Apollo 18 Final Presentation

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  1. Chris Davidoff Jacob Hermann Jared Levin Lindsey Buxman Apollo 18Final Presentation Maggie Williams Peter Merrick Cody Gondek Nathan Buzzell 12/11/12

  2. Mission Overview • Our mission was to calculate the speed of sound as our satellite rose to 30 km. • We expected the speed of sound to change in relation to the temperature and pressure changes. • We predicted that temperature would influence the speed of sound the most. • This data could be useful for high-altitude aircraft.

  3. Design Overview Bottom box • Critical systems • Camera • Micro controllers • Heater • Sensors • Microphone • Temperature • g-force • Humidity • Pressure Top box • Speakers • Heater

  4. Final Adjustments • Removed RF links, unnecessary • Filtered the code to exact frequency the speakers emit, to reduce recorded errors

  5. Functional Block Diagram

  6. Results and Analysis

  7. Accelerometer

  8. Percent Humidity

  9. Pressure

  10. Temperature

  11. Recorded experimental Data

  12. Speed of Sound calculated from collected data

  13. Predicted Results

  14. Speed Data and Temperature

  15. Data Before Gap

  16. Data After Gap

  17. Failure Analysis • Microphone stopped collecting data • Using GoPro video, we determined that the speakers continued to work during flight • Gap in the data from when the satellite entered the stratosphere to when the string was cut.

  18. Speed Data and Temperature

  19. Pressure and Data

  20. Change in Pressure The point at which the microphone ceased to collect data was when the pressure was at it's lowest point (under 2.2 psi) Decreased pressure also decreases the volume of the speakers To fix this for future flights, we adjusted the filtering in the coding of the microphone to collect a wider range of data

  21. Phet Simulation Pressure Relation to Volume

  22. Preflight Data

  23. Conclusions • We found that as temperature decreases the speed of sound decreases. • We also found that pressure is a large factor in sound travel. • An apparatus with the two separate modules can measure the speed of sound in the atmosphere. • We discovered that carbon fiber tubes are a lightweight and decent cost solution for a strong yet flexible structure.

  24. Ready to Fly Again • Microphone • Capabilities, Insulation • Batteries • SD Cards • Speaker Threshold

  25. Lessons Learned • Test the mission experiment more thoroughly • A stiffer structure may be beneficial • A louder speaker is a MUST • Try and make your experiment fail during testing • Time management • Working with a team

  26. Requirement Compliance • Reached 99,430 ft. • S.O.S.-(G)-325 m/s (A)-279.15 m/s • Internal temp.- -10 Celcius • Spent- $121.78 • weight- 1110g

  27. Budget and Final Mass

  28. Messages To Next Semester • Utilize the skills of every team member • Stay organized • Communicate • Stay positive • Be passionate about your idea and making it work

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